271 results on '"Yu Chun Chen"'
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2. Deep Learning–Assisted Burn Wound Diagnosis: Diagnostic Model Development Study
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Che Wei Chang, Feipei Lai, Mesakh Christian, Yu Chun Chen, Ching Hsu, Yo Shen Chen, Dun Hao Chang, Tyng Luen Roan, and Yen Che Yu
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Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
BackgroundAccurate assessment of the percentage total body surface area (%TBSA) of burn wounds is crucial in the management of burn patients. The resuscitation fluid and nutritional needs of burn patients, their need for intensive unit care, and probability of mortality are all directly related to %TBSA. It is difficult to estimate a burn area of irregular shape by inspection. Many articles have reported discrepancies in estimating %TBSA by different doctors. ObjectiveWe propose a method, based on deep learning, for burn wound detection, segmentation, and calculation of %TBSA on a pixel-to-pixel basis. MethodsA 2-step procedure was used to convert burn wound diagnosis into %TBSA. In the first step, images of burn wounds were collected from medical records and labeled by burn surgeons, and the data set was then input into 2 deep learning architectures, U-Net and Mask R-CNN, each configured with 2 different backbones, to segment the burn wounds. In the second step, we collected and labeled images of hands to create another data set, which was also input into U-Net and Mask R-CNN to segment the hands. The %TBSA of burn wounds was then calculated by comparing the pixels of mask areas on images of the burn wound and hand of the same patient according to the rule of hand, which states that one’s hand accounts for 0.8% of TBSA. ResultsA total of 2591 images of burn wounds were collected and labeled to form the burn wound data set. The data set was randomly split into training, validation, and testing sets in a ratio of 8:1:1. Four hundred images of volar hands were collected and labeled to form the hand data set, which was also split into 3 sets using the same method. For the images of burn wounds, Mask R-CNN with ResNet101 had the best segmentation result with a Dice coefficient (DC) of 0.9496, while U-Net with ResNet101 had a DC of 0.8545. For the hand images, U-Net and Mask R-CNN had similar performance with DC values of 0.9920 and 0.9910, respectively. Lastly, we conducted a test diagnosis in a burn patient. Mask R-CNN with ResNet101 had on average less deviation (0.115% TBSA) from the ground truth than burn surgeons. ConclusionsThis is one of the first studies to diagnose all depths of burn wounds and convert the segmentation results into %TBSA using different deep learning models. We aimed to assist medical staff in estimating burn size more accurately, thereby helping to provide precise care to burn victims.
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- 2021
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3. Relationships between bisphenol A and paraben exposure, oxidative stress, and the activity of outer hair cells in the cochlea in children with hearing loss
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Chia-Huang Chang, Chun-Ting Lu, Tai-Ling Chen, Hsin-Chang Chen, Wen-Chi Pan, Chen-Wei Chang, Yu-Chun Chen, and Yu-Lin Yu
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Hearing loss ,Children’s health ,Bisphenol A ,Parabens ,Outer hair cell activity ,Environmental pollution ,TD172-193.5 ,Environmental sciences ,GE1-350 - Abstract
This study aimed to determine the associations of childhood exposure to bisphenol A (BPA) and parabens (PBs) with oxidative stress and the activity of outer hair cells (OHCs) in the cochlea of children with hearing loss (HL). A total of 641 children were enrolled in this cross-sectional study. Urinary concentrations of BPA and four PBs including methyl paraben (MP), ethyl paraben (EP), propyl paraben (PP), and butyl paraben (BP) were quantified by using liquid chromatography–tandem mass spectrometry (LC/MSMS). Four urinary biomarkers of oxidative stress, 8-hydroxy-2′-deoxyguanosine (8-OHdG), 8-nitroguanine (8-NO2Gua), 4-hydroxynonenal mercapturic acid (HNE-MA), and 8-isoprostaglandin F2α (8-iso-PGF2α), were measured using high-performance liquid chromatography-electrospray ionization mass spectrometry. Hearing tests were conducted by an audiologist in the audiometric test room, and the results were confirmed by an otolaryngologist. The activity of OHCs in the cochlea was measured by distortion product otoacoustic emissions (DPOAEs). The associations of BPA/PB exposure and oxidative stress with the activity of OHCs at different frequencies were evaluated in the multivariable linear regression models. There were 91 children with HL, for an incidence of approximately 14.2 %. There was a significant negative association between the presence of EP (1.5 K Hz, 3 K Hz) or PP (2 K Hz) or 8-OHdG (1 K Hz, 1.5 K Hz, 2 K Hz) and the activity of OHCs in the left ear. Significant results were also observed for BPA (2 K Hz), MP (1 K Hz, 1.5 K Hz, 2 K Hz), EP (3 K Hz), and 8-OHdG (2 K Hz) in the right ear. This study revealed that exposure to BPA/PBs reduces the activity of OHCs, especially at middle frequencies, in children.
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- 2024
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4. Integration and Assessment of ChatGPT in Medical Case Reporting: A Multifaceted Approach
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Kuan-Chen Lin, Tsung-An Chen, Ming-Hwai Lin, Yu-Chun Chen, and Tzeng-Ji Chen
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artificial intelligence ,case reports ,LLM ,clinical thinking ,medical writing ,health science ,Public aspects of medicine ,RA1-1270 ,Psychology ,BF1-990 - Abstract
ChatGPT, a large language model, has gained significance in medical writing, particularly in case reports that document the course of an illness. This article explores the integration of ChatGPT and how ChatGPT shapes the process, product, and politics of medical writing in the real world. We conducted a bibliometric analysis on case reports utilizing ChatGPT and indexed in PubMed, encompassing publication information. Furthermore, an in-depth analysis was conducted to categorize the applications and limitations of ChatGPT and the publication trend of application categories. A total of 66 case reports utilizing ChatGPT were identified, with a predominant preference for the online version and English input by the authors. The prevalent application categories were information retrieval and content generation. Notably, this trend remained consistent across different months. Within the subset of 32 articles addressing ChatGPT limitations in case report writing, concerns related to inaccuracies and a lack of clinical context were prominently emphasized. This pointed out the important role of clinical thinking and professional expertise, representing the foundational tenets of medical education, while also accentuating the distinction between physicians and generative artificial intelligence.
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- 2024
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5. Genomic insights into mRNA COVID-19 vaccines efficacy: Linking genetic polymorphisms to waning immunity
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Min-Jia Hsieh, Ping-Hsing Tsai, Pin-Hsuan Chiang, Zih-Kai Kao, Zi-Qing Zhuang, Ai-Ru Hsieh, Hsiang-Ling Ho, Shih-Hwa Chiou, Kung-Hao Liang, and Yu-Chun Chen
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COVID-19 ,mRNA-based vaccines ,waning immunity ,genetic polymorphisms ,long-term memory CD8+ T cells ,Immunologic diseases. Allergy ,RC581-607 ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Genetic polymorphisms have been linked to the differential waning of vaccine-induced immunity against COVID-19 following vaccination. Despite this, evidence on the mechanisms behind this waning and its implications for vaccination policy remains limited. We hypothesize that specific gene variants may modulate the development of vaccine-initiated immunity, leading to impaired immune function. This study investigates genetic determinants influencing the sustainability of immunity post-mRNA vaccination through a genome-wide association study (GWAS). Utilizing a hospital-based, test negative case-control design, we enrolled 1,119 participants from the Taiwan Precision Medicine Initiative (TPMI) cohort, all of whom completed a full mRNA COVID-19 vaccination regimen and underwent PCR testing during the Omicron outbreak. Participants were classified into breakthrough and protected groups based on PCR results. Genetic samples were analyzed using SNP arrays with rigorous quality control. Cox regression identified significant single nucleotide polymorphisms (SNPs) associated with breakthrough infections, affecting 743 genes involved in processes such as antigenic protein translation, B cell activation, and T cell function. Key genes identified include CD247, TRPV1, MYH9, CCL16, and RPTOR, which are vital for immune responses. Polygenic risk score (PRS) analysis revealed that individuals with higher PRS are at greater risk of breakthrough infections post-vaccination, demonstrating a high predictability (AUC = 0.787) in validating population. This finding confirms the significant influence of genetic variations on the durability of immune responses and vaccine effectiveness. This study highlights the importance of considering genetic polymorphisms in evaluating vaccine-induced immunity and proposes potential personalized vaccination strategies by tailoring regimens to individual genetic profiles.
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- 2024
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6. Enhancing COVID-19 booster vaccination among the elderly through text message reminders
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Yi-Cheng Lee, Bing-Hau Lee, Yi-Hsuan Lin, Bih-Ju Wu, Tzeng-Ji Chen, Wei-Ming Chen, and Yu-Chun Chen
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Text message reminder ,SMS ,COVID-19 ,booster ,vaccine ,vaccination ,Immunologic diseases. Allergy ,RC581-607 ,Therapeutics. Pharmacology ,RM1-950 - Abstract
The BOOST (Booster promotion for older outpatients using SMS text reminders) program at Taipei Veterans General Hospital assessed the effectiveness of text message reminders in enhancing COVID-19 booster vaccination rates among the elderly, guided by the Health Belief Model (HBM). Targeting patients aged 65 and above, eligible yet unvaccinated for a COVID-19 booster, this cohort study sent personalized reminders a week prior to their scheduled appointments between April 18, 2022, and May 12, 2022, acting as cues to action to enhance vaccination uptake by overcoming perceived barriers and raising awareness of benefits. Over 5 weeks, the study observed a 38% increase in vaccination rate among 3,500 eligible patients, markedly surpassing the concurrent national rate increase of 4% for the same demographic. The majority of vaccinations occurred within two weeks after the reminder, illustrating the effectiveness of the strategy. Cox regression analysis identified age and time since last vaccination as significant predictors of responsiveness, with those aged 65–74 and 75–84 showing higher uptake, particularly when reminders were sent within 4 months after the last dose. A single reminder proved to be effective. The findings of this study demonstrate the potential of SMS reminders to promote COVID-19 vaccination among the elderly through the strategic use of HBM principles, suggesting a feasible and effective approach to public health communication.
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- 2024
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7. Caffeine supplementation improves the cognitive abilities and shooting performance of elite e-sports players: a crossover trial
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Shih-Hao Wu, Yu-Chun Chen, Che-Hsiu Chen, Hou-Shao Liu, Zhi-Xin Liu, and Chih-Hui Chiu
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Medicine ,Science - Abstract
Abstract We explored the effect of 3 mg/kg of caffeine supplementation on the cognitive ability and shooting performance of elite e-sports players. Nine e-sports players who had received professional training in e-sports and had won at least eighth place in national-level e-sports shooting competitions. After performing three to five familiarization tests, we employed a single blind, randomized crossover design to divide participants into caffeine trial (CAF) and placebo trial (PL). The CAF trial took capsules with 3 mg/kg of caffeine, whereas the PL trial took a placebo capsule. After a one-hour rest, the Stroop task, the visual search ability test, and the shooting ability test were conducted. The CAF trial’s performance in the Stroop task in terms of congruent condition (P = 0.023) and visual search reaction time with 20 items (P = 0.004) was significantly superior to those of the PL trial. In the shooting test, the CAF trial’s kill ratio (P = 0.020) and hit accuracy (P = 0.008) were significantly higher, and the average time to target (P = 0.001) was significantly shorter than those of the PL trial. Caffeine supplementation significantly improves e-sports players’ reaction times and shooting performance.
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- 2024
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8. Negative emotionality downregulation affects moral choice but not moral judgement of harm: a pharmacological study
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Roger Marcelo Martinez, Shih-Han Chou, Yang-Teng Fan, Yu-Chun Chen, Kah Kheng Goh, and Chenyi Chen
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Medicine ,Science - Abstract
Abstract Previous neuroscientific research has expounded on the fundamental role played by emotion during moral decision-making. Negative emotionality has been observed to exert a general inhibitory effect towards harmful behaviors against others. Nevertheless, the downregulation of negative affects at different levels of moral processing (e.g. impersonal versus personal moral dilemmas) alongside its possible interactions with other factors (e.g. perspective taking) hasn’t been directly assessed; both of which can assist in predicting future moral decision-making. In the present research, we empirically test (Study 1, N = 41) whether downregulating negative emotionality through pharmacological interventions using lorazepam (a GABA receptor agonist), modulate the permissibility of harm to others –i.e. if participants find it more morally permissible to harm others when harm is unavoidable (inevitable harm moral dilemmas), than when it may be avoided (evitable harm moral dilemmas). Furthermore, using another sample (Study 2, N = 31), we assess whether lorazepam’s effect is modulated by different perspective-taking conditions during a moral dilemma task –e.g. “is it morally permissible for you to […]?” (1st person perspective), relative to “is it morally permissible for [x individual] to […]?” (3rd person perspective)–, where the outcome of the different scenarios is controlled. The results of both studies converge, revealing an emotion-dependent, rather than an outcome-dependent, pharmacological modulation. Lorazepam only influenced interpersonal moral judgments when not modulated by the evitable/inevitable condition. Furthermore, there was a significant interaction between perspective-taking and drug administration, as lorazepam exerted a larger effect in modulating moral choices rather than moral judgements.
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- 2024
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9. Smart cost estimation: Empirical case for extra-high voltage transmission towers
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Diana Wahyu Hayati, Jieh-Haur Chen, Yu-Chun Chen, Shixian Li, Machsus Machsus, Mohamad Khoiri, Qian-Cheng Wang, and Hsi-Hsien Wei
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Energy ,Extra-high voltage (EHV) transmission towers ,Construction cost estimation ,Support vector regression (SVR) ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Nowadays, electricity has become an integral part of human lives. Most of our daily appliances, tools, and personal belongings are inseparable from electricity. To ensure a proper electricity distribution with an efficient transfer capability, Extra-High Voltage (EHV) transmission towers are needed. To design such a structure, it is of utmost importance to account for the cost of said tower. However, the process to estimate the cost of EHV transmission towers is both time-consuming and strenuous on human labor since a lot of consideration have to be taken. To overcome this, an imperative requirement exists for a prompt, precise, and automated tool to replace the existing manual cost estimation method. This research endeavor aims to craft a tool using support vector regression (SVR) with the capacity to prognosticate construction expenses for projects involving EHV transmission towers. The exploration of pertinent literature has enabled us to amass historical data and delineate the attributes essential for estimating costs linked to EHV transmission tower construction. The investigation delves into a comprehensive dataset spanning the past decade in Taiwan. Within this timeframe, 317 EHV transmission towers were erected between 2009 and 2019. However, 79 of these instances are excluded due to incomplete information, thereby yielding 238 viable datasets (comprising 75 % of the overall total) to underpin the development of the SVR model. By configuring the parameters to C = 0.2 and γ = 0.1, followed by 5-fold cross-validation, the resultant SVR model attains a remarkable prediction accuracy of 97.91 %, on average. As a result, the proposed SVR-based model can effectively and accurately predict the cost of constructing an EHV transmission tower project and reduce the time spent on estimation, thus contributing to the enhancement of the resilience and robustness of the transmission network system.
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- 2024
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10. The Time from Submission to Publication in Primary Health Care Journals: A Cross-Sectional Study
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Tsung-An Chen, Ming-Hwai Lin, Yu-Chun Chen, and Tzeng-Ji Chen
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primary health care ,publication time ,health professional education ,bibliometrics ,Communication. Mass media ,P87-96 ,Information resources (General) ,ZA3040-5185 - Abstract
Background: The time from submission to publication can significantly impact the speed of knowledge dissemination and is influenced by multiple factors. This research aims to investigate the time from submission to publication of journals of primary health care and to explore the factors that influence this duration. Methods: We selected journals of primary health care and extracted their impact factors, annual publication frequencies, and open access status. The time from submission to acceptance (SA lag), acceptance to publication (AP lag), and submission to publication (SP lag) were calculated. Additionally, we conducted statistical analyses to determine whether impact factors, annual publication frequencies, and journal open access status had an influence on publication time. Results: This study revealed the average SP lag was 243.4 days (interquartile range, IQR 159–306), the average SA lag was 177.8 days (IQR 99–229.3), and the average AP lag was 65.6 days (IQR 14–101). Variations were observed in SP lag, SA lag, and AP lag among different journals. SP lag generally decreased with higher impact factors. Journals with open access had longer SA lag but shorter AP lag. There was a general trend of decreasing SP lag and SA lag with an increasing number of annual publications, but no clear trend was observed for AP lag. Conclusions: Improvements are needed in reducing the duration from submission to publication for primary health care journals. Significant variation exists among journals. Additionally, factors such as the impact factor, open access status, and the number of annual publications may influence publication speed.
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- 2024
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11. Medication-Seeking Behaviors and Correlated Characteristics of Zolpidem Users in Taiwan—A Shared Patient Network Analysis
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Yi-Ju Pan, Sheng-Hsuan Chang, Wei-Chen Lee, and Yu-Chun Chen
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sedative–hypnotic drug ,zolpidem ,medication-seeking behavior ,Medicine - Abstract
Increasing insomnia signals a public health problem, alongside rising zolpidem use. This study investigates the factors behind the disproportionate rise in zolpidem prescriptions in Taiwan. It aims to identify the determinants of high-dose zolpidem users in Taiwan’s Yilan County and employ an innovative approach to outline their medication-seeking patterns, using Taiwan’s healthcare database. The associations between sociodemographic and clinical factors and low-dose and high-dose users were analyzed using multiple logistic regression. Social network analysis was employed to explore medication-seeking behavior among these user groups across different healthcare institutions. Of our 5290 participants, 22.82% are high-dose users. This study found that males face a 1.33-fold higher risk and that having chronic diseases is a major risk factor, contributing to a more than four-times higher risk (adjusted OR = 4.27, 95% CI 1.55–11.70) of being a high-dose user of zolpidem. A social network analysis showed a higher density (0.52) for high-dose users, revealing their frequent visits, for zolpidem, to different healthcare institutions. Psychiatrists have a central role in both low-dose and high-dose user networks, with a greater influence on low-dose users (64.4) than high-dose users (32.2). In sum, patients seeking high doses of zolpidem are driven by personal factors. Future efforts should include regulated dispensing, public health education, and specialized training for healthcare professionals on drug addiction.
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- 2024
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12. Incidence and Nature of Short-Term Adverse Events following COVID-19 Second Boosters: Insights from Taiwan’s Universal Vaccination Strategy
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Ching-Hao Lin, Tsung-An Chen, Pin-Hsuan Chiang, Ai-Ru Hsieh, Bih-Ju Wu, Po-Yu Chen, Kuan-Chen Lin, Zih-Syun Tsai, Ming-Hwai Lin, Tzeng-Ji Chen, and Yu-Chun Chen
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COVID-19 booster vaccination ,adverse events ,vaccine safety ,immunization strategies ,pharmacovigilance ,mRNA vaccines ,Medicine - Abstract
This study evaluates the incidence and characteristics of adverse events (AEs) following the second COVID-19 booster dose, leveraging Taiwan’s distinctive approach of extending booster vaccinations to all citizens, unlike the targeted high-risk group strategies in other countries. Utilizing data from Taipei Veterans General Hospital’s Vaccine Adverse Event Reporting System (VAERS) from 27 October 2022 to 19 January 2023, this research examines AEs in 441 out of 1711 booster recipients, considering factors like age, vaccine brands, and booster combinations. The findings revealed incidence rates (IRs) of 25.6% (95% CI: 21.1–30.8) after the first booster and 24.9% (95% CI: 20.5–30.0) after the second, mostly non-serious, with those having AEs post-first booster being five times more likely to report them again (incidence rate ratio, 5.02, p < 0.001). Significantly, switching from the mRNA1273 vaccine to another brand reduced AE risk by 18%. This study underscores that AEs are more repetitive than cumulative with additional booster doses, advocating for personalized vaccination strategies based on individual medical histories and previous vaccine reactions. These insights are valuable for healthcare providers in discussing potential AEs with patients, thereby improving vaccine compliance and public trust, and for policymakers in planning future booster vaccination strategies.
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- 2024
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13. A Review on Glaze Layers in High Temperature Sliding Friction
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PENG Yu - chun, CHEN Long, ZHANG Xiang - lei, CHEN Wei, ZHOU Hong - ming
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high temperature ,sliding friction and wear ,glaze layer ,high temperature antifriction ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Technology - Abstract
The importance of glaze layer in the reducation of high temperature sliding friction was introduced, and the research status and development prospect of glaze layer applied on the surface in the field of high temperature sliding friction and wear were discussed. In addition, the microstructure, formation mechanism and influencing factors of glaze layer in high temperature sliding tribology in recent years were analyzed and summarized. Through avoiding the direct contact between metals, the glaze layer could protect the matrix effectively. As the high temperature friction and wear was influenced by many factors (force, heat, material properties, etc.), the formation process of glaze layer was particularly complex, and there was no unified understanding of the formation mechanism of glaze layer. The high - temperature antifriction of glaze layer played an important role in high - temperature sliding tribology. The design of glaze layer and the control of formation conditions were important research directions of high - temperature wear - resistant materials in the future.
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- 2022
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14. Interaction effects of the 5-HTT and MAOA-uVNTR gene variants on pre-attentive EEG activity in response to threatening voices
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Róger Marcelo Martínez, Tsai-Tsen Liao, Yang-Teng Fan, Yu-Chun Chen, and Chenyi Chen
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Biology (General) ,QH301-705.5 - Abstract
Martínez, Liao and colleagues investigate the processing of fearful stimuli in individuals with variations in genes linked to serotonergic brain function. They find evidence of an interaction between these variations and the pre-attentive processing of those stimuli.
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- 2022
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15. Microbial community dynamics in electroactive biofilms across time under different applied anode potentials
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Chao-Chin Chang, Yu-Chun Chen, and Chang-Ping Yu
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Poised anode potentials ,Current production ,Microbial community ,Electrochemically active bacteria ,Principal component analysis ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Abstract In bioelectrochemical wastewater treatment systems, electrochemically active bacteria (EAB) in the anode can simultaneously treat wastewater and produce electricity via extracellular electron transfer. The anode potential has been reported as one way for selecting EAB; though, conflicting results of the relationship between applied potentials and the performance and community composition of EAB have been reported. In this study, we investigated the cultivation time and applied anode potentials (+0.2, 0, −0.2, and −0.4 V vs. Ag/AgCl) on the performance of current production and the compositions of the microbial community. Our results showed that the applied potentials affected the performance of current production, but the effect was substantially reduced with cultivation time. Particularly, the current gradually increased from negative to positive values with time for the applied anode potential at −0.4 V, implying the anode biofilm shifted from accepting electrons to producing electrons. In addition, principal coordinates analysis results indicated that microbial community compositions became closer to each other after long-term enrichment. Subsequently, principal component analysis demonstrated that systems with applied potentials from +0.2, 0 to −0.2 V and at −0.4 V were, respectively, reclassified into principal component 1 (higher-energy-harvesting group) and principal component 2 (lower-energy-harvesting group), implying in addition to cultivation time, the amount of energy available for bacterial growth is another key factor that influences EAB populations. Overall, this study has demonstrated that the selected cultivation time and the particular anode potentials applied in the study determine whether the applied anode potentials would affect the community and performance of EAB.
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- 2022
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16. The association between mortality and use of Chinese herbal medicine among incident stage IV esophageal cancer patients: A retrospective cohort study with core herbs exploration
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Shu-Ling Chen, Wei-Chun Lin, Yu-Chun Chen, Jiun-Liang Chen, Yi-Hong Wu, Sien-Hung Yang, and Hsing-Yu Chen
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chinse herbal medicine ,Chinese herbal medicine network ,pharmacology network ,stage IV esophageal cancer ,survival analysis ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Esophageal cancer (EC) remains a leading cause of death worldwide and in Taiwan. The prognosis of advanced-stage EC is notably poor, and the treatment options are limited. Chinese herbal medicine (CHM) has been widely used as a complementary treatment for cancer, yet the long-term effect of CHM in stage IV EC remains unclear.The multi-institutional cohort obtained from the Chang Gung research database (CGRD) was used to study the long-term outcome of CHM use among incident stage IV EC patients from 1 January 2002, to 31 December 2018. All patients were followed up to 5 years or the occurrence of death. The overall survival (OS) and disease-specific survival rates were conducted using Kaplan-Meier estimation. Overlap weighing and landmark analysis were used to eliminate confounding and immortal time biases. Furthermore, we demonstrated the core CHMs for stage IV EC by using the Chinese herbal medicine network (CMN) analysis on prescriptions.Nine hundred eighty-five stage IV EC patients were analyzed, including 74 CHM users and 911 non-CHM users. We found the use of CHM was associated with a higher 5-year overall survival rate than CHM nonusers (the cumulative probability: 19.52% versus 6.04%, log-rank test: p < 0.001, and the p < 0.001 with overlap weighting). In addition, the overall median survival time was about 7 months longer among CHM users. Moreover, the lower 1-, 3-, 5-year disease-specific survival rates were higher among CHM users. Additionally, the risk of all-cause mortality was lower among CHM users when considering accessible demographic covariates (adjusted hazard ratio: 0.59, 95%CI: 0.39, 0.89, p = 0.011). Furthermore, the CMN analysis revealed that CHMs improved health while relieving tumor burden. For example, Hedyotis diffusa Willd. was the core CHM with an anti-cancer effect, while Fritillaria thunbergii Miq and Sevilla maindronide Rochebrune were used together to relieve cancer-related gastrointestinal discomfort.The use of CHM seems safe and possibly beneficial among stage IV EC patients with a higher 5-year OS. Further clinical trials on CHM were guaranteed to explore the role of CHM in managing stage IV EC patients.
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- 2022
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17. Team-based care improves quality of diabetes care -Family Practice Integrated Care Project in Taiwan
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Jerry Che-Jui Chang, Shinn-Jang Hwang, Tzeng-Ji Chen, Tai-Yuan Chiu, Hsiao-Yu Yang, Yu-Chun Chen, Cheng-Kuo Huang, and Chyi-Feng Jan
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Quality of health care ,Family practice integrated care project ,Delivery of health care ,Policy ,Primary health care ,Diabetes mellitus ,Medicine (General) ,R5-920 - Abstract
Abstract Background The Family Practice Integrated Care Project (FPICP) is a team-based program in Taiwan initiated in 2003. This study investigates the influence of FPICP on the quality of diabetes care. Methods This population-based cohort study used Taiwan’s National Health Insurance Administration data on FPICP (fiscal year 2015–2016, with follow-up duration of one year). Participants included diabetic patients aged ≥30 in primary care clinics. We used conditional logistic regression modeling of patient characteristics and annual diabetes examinations and compared FPICP participants with non-participating candidates. Main outcome measures included completion of annual diabetes examinations, including glycated hemoglobin (A1c), low-density lipoprotein (LDL), urine microalbumin (MAU), routine urinalysis (UR), and fundus examination (FE). Results The sample included 298,208 FPICP participants and 478,778 non-participating candidates. After 1:1 propensity score matching, the examination completion rates for FPICP participants and non-participants, respectively, were 94.4% versus 93.6% in A1c, 84.2% versus 83.8% in LDL, 61.9% versus 60.1% in MAU, 59.2% versus 58.0% in UR, and 30.1% versus 32.4% in FE. Conclusion Our findings indicate that a program like FPICP helps improve the quality of diabetes care through regular examinations of Alc, LDL, MAU, and UR.
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- 2020
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18. Vancomycin-loaded oxidized hyaluronic acid and adipic acid dihydrazide hydrogel: Bio-compatibility, drug release, antimicrobial activity, and biofilm model
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Chun-Hsing Liao, Chiang Sang Chen, Yu-Chun Chen, Ni-En Jiang, Chui Jia Farn, Yi-Shan Shen, Ming-Lun Hsu, and Chih-Hung Chang
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Antibiotic hydrogel ,Vancomycin ,Biofilm ,Microbiology ,QR1-502 - Abstract
Background: Prosthesis infection is a difficult-to-treat situation. Hydrogel is a novel biomaterial, which can be applied by simply spraying or by coating on implants before surgery and can be easily mixed with antibiotics. Methods: In order to evaluate the potential use of antibiotic-loaded hydrogel, we incorporated vancomycin into oxidized hyaluronic acid (HA) and adipic acid dihydrazide and evaluated the drug release and antimicrobial activity against methicillin-resistant Staphylococcus aureus (ATCC 29213). Results: The average release percentage of vancomycin on day 3 was about 86%. The antibiotic-loaded gel was biocompatible with mesenchymal stem cell, MC3T3, and L929 cell lines. The in vitro inhibition zones of vancomycin-loaded hydrogel [500X minimal inhibition concentration (MIC), 50X MIC, 10X MIC, and blank hydrogel] were 21, 13, 9, and 5 mm, respectively. In the Ti6Al4V implant biofilm model, 0.01–1% vancomycin-loaded gel exhibited significant anti-biofilm activity, measured by the MTT assay. Conclusions: Vancomycin could be loaded onto oxidized HA and adipic acid dihydrazide, which exhibited excellent drug release and in vitro antimicrobial activity with minimal cell toxicity.
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- 2020
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19. Numerical study of fluid flow and temperature distributions in a data center
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Tien-Fu Yang, Yu-Chun Chen, Bo-Lin Chen, Chun-Han Li, and Wei-Mon Yan
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Computational fluid dynamics ,Data center ,Flow field ,Temperature distribution ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
With the advent of 5th-generation mobile networks, the internal computing of data centers is very important. However, a server's calculations cause significant thermal problems. Therefore, this study focuses on the thermal analysis of a single rack in a data center. In this work, the airflow and temperature distributions in a single rack are examined numerically in detail. The computational fluid dynamics software is used to simulate the airflow field and temperature profile. The focus of the research is removal of heat from servers in the rack under different operating conditions and designs. The predicted results show that Case 2's size and 0.45 m of raised-floor depth would help to create a uniform airflow distribution at the same rate. Besides, the Return temperature index is used to evaluate the performance of data center. The results of Model 1 and 2 for three flow rate are presented and compared in details.
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- 2021
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20. Traditional Chinese medicine use is associated with lower end-stage renal disease and mortality rates among patients with diabetic nephropathy: a population-based cohort study
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Hsing-Yu Chen, Heng-Chih Pan, Yung-Chang Chen, Yu-Chun Chen, Yi-Hsuan Lin, Sien-Hung Yang, Jiun-Liang Chen, and Hau-Tieng Wu
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Chronic kidney disease ,Diabetes mellitus ,Diabetic nephropathy ,End-stage renal disease ,Mortality ,Traditional Chinese medicine ,Other systems of medicine ,RZ201-999 - Abstract
Abstract Background Diabetic nephropathy (DN) is a common complication of diabetes mellitus (DM) that imposes an enormous burden on the healthcare system. Although some studies show that traditional Chinese medicine (TCM) treatments confer a protective effect on DN, the long-term impact remains unclear. This study aims to examine end-stage renal disease (ESRD) and mortality rates among TCM users with DN. Methods A total of 125,490 patients with incident DN patients from 2004 to 2006 were identified from the National Health Insurance Research Database in Taiwan and followed until 2012. The landmark method was applied to avoid immortal time bias, and propensity score matching was used to select 1:1 baseline characteristics-matched cohort. The Kaplan–Meier method and competing-risk analysis were used to assess mortality and ESRD rates separately. Results Among all eligible subjects, about 60% of patients were classified as TCM users (65,812 TCM users and 41,482 nonusers). After 1:1 matching, the outcomes of 68,882 patients were analyzed. For the ESRD rate, the 8-year cumulative incidence was 14.5% for TCM users [95% confidence interval (CI): 13.9–15.0] and 16.6% for nonusers (95% CI: 16.0–17.2). For the mortality rate, the 8-year cumulative incidence was 33.8% for TCM users (95% CI: 33.1–34.6) and 49.2% for nonusers (95% CI: 48.5–49.9). After adjusting for confounding covariates, the cause-specific hazard ratio of ESRD was 0.81 (95% CI: 0.78–0.84), and the hazard ratio of mortality for TCM users was 0.48 (95% CI: 0.47–0.50). The cumulative incidence of mortality increased rapidly among TCM users with ESRD (56.8, 95% CI: 54.6–59.1) when compared with TCM users without ESRD (30.1, 95% CI: 29.4–30.9). In addition, TCM users who used TCM longer or initiated TCM treatments after being diagnosed with DN were associated with a lower risk of mortality. These results were consistent across sensitivity tests with different definitions of TCM users and inverse probability weighting of subjects. Conclusions The lower ESRD and mortality rates among patients with incident DN correlates with the use of TCM treatments. Further studies about specific TCM modalities or medications for DN are still needed.
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- 2019
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21. Risk Factors and Incidence Rates of Self-Reported Short-Term Adverse Events of COVID-19 Vaccine Booster Dose
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Po-Yu Chen, Bih-Ju Wu, Mei-Chin Su, Yen-Hsi Lin, Shu-Chiung Chiang, Jau-Ching Wu, Tzeng-Ji Chen, and Yu-Chun Chen
- Subjects
COVID-19 vaccines ,adverse events (AE)/reaction ,short-term serious adverse events (SAE) ,short-term non-serious adverse events (NSAE) ,vaccine adverse event reporting system (VAERS) ,booster vaccination ,Medicine - Abstract
With the spread of the new SARS-CoV-2 variants, many countries have begun COVID-19 vaccine booster programs with the mix-and-match strategy. However, research on the adverse events (AE) of booster doses is still scarce. The aim of our study was to analyze the reported incidence rate (IR), and factors associated with AE, including short-term serious adverse events (SAE) and short-term non-serious adverse events (NSAE), among different vaccine products through the hospital-based Vaccine Adverse Event Reporting System (VAERS). A total of 7432 records were collected during the three-month study period. While more than half of the responses (52.2%) reported the presence of AE after receiving a booster dose, only a few AE were considered SAE (2.4%). AE were significantly higher among women and people of younger age, and the brand of vaccines is the strongest factor associated with post-booster dose AE. The incidence of AE in mRNA1273 is higher than in BNT162b2 and MVC-COV1901 (IRR mRNA1273 vs. BNT162b2: 1.22, 95% CI: 1.11–1.34; BNT162b2 vs. MVC-COV1901: 2.77, 95% CI: 2.27–3.39). The IR of different groups were calculated to support the decision making of the booster vaccine. Although AE were not uncommon for booster vaccines, almost all AE were not serious and predictable using estimated IR. This result can be used to optimize booster vaccine decision making.
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- 2022
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22. Impact of team-based community healthcare on preventable hospitalisation: a population-based cohort study in Taiwan
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Hsiao-Yu Yang, Tzeng-Ji Chen, Chyi-Feng Jeff Jan, Che-Jui Jerry Chang, Shinn-Jang Hwang, Yu-Chun Chen, Cheng-Kuo Huang, and Tai-Yuan Chiu
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Medicine - Abstract
Objectives The objective of this study was to explore the impact of Taiwan’s Family Practice Integrated Care Project (FPICP) on hospitalisation.Design A population-based cohort study compared the hospitalisation rates for ambulatory care sensitive conditions (ACSCs) among FPICP participating and non-participating patients during 2011–2015.Setting The study accessed the FPICP reimbursement database of Taiwan’s National Health Insurance (NHI) administration containing all NHI administration-selected patients for FPICP enrolment.Participants The NHI administration-selected candidates from 2011 to 2015 became FPICP participants if their primary care physicians joined the project, otherwise they became non-participants.Interventions The intervention of interest was enrolment in the FPICP or not. The follow-up time interval for calculating the rate of hospitalisation was the year in which the patient was selected for FPICP enrolment or not.Primary outcome measures The study’s primary outcome measures were hospitalisation rates for ACSC, including asthma/chronic obstructive pulmonary disease (COPD), diabetes or its complications and heart failure. Logistic regression was used to calculate the ORs concerning the influence of FPICP participation on the rate of hospitalisation for ACSC.Results The enrolled population for data analysis was between 3.94 and 5.34 million from 2011 to 2015. Compared to non-participants, FPICP participants had lower hospitalisation for COPD/asthma (28.6‰–35.9‰ vs 37.9‰–42.3‰) and for diabetes or its complications (10.8‰–14.9‰ vs 12.7‰–18.1‰) but not for congestive heart failure. After adjusting for age, sex and level of comorbidities by logistic regression, participation in the FPICP was associated with lower hospitalisation for COPD/asthma (OR 0.91, 95% CI 0.87 to 0.94 in 2015) and for diabetes or its complications (OR 0.87, 95% CI 0.83 to 0.92 in 2015).Conclusion Participation in the FPICP is an independent protective factor for preventable ACSC hospitalisation. Team-based community healthcare programs such as the FPICP can strengthen primary healthcare capacity.
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- 2021
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23. Delivery of Mesenchymal Stem Cell in Dialdehyde Methylcellulose-Succinyl-Chitosan Hydrogel Promotes Chondrogenesis in a Porcine Model
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Yu-Chun Chen, Hsiu-Jung Liao, Yuan-Ming Hsu, Yi-Shan Shen, and Chih-Hung Chang
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dialdehyde methylcellulose ,succinyl-chitosan ,hydrogel ,chondrogenesis ,mesenchymal stem cell ,Organic chemistry ,QD241-441 - Abstract
Due to the limitation in the current treatment modalities, such as secondary surgery in ACI and fibrocartilage formation in microfracture surgery, various scaffolds or hydrogels have been developed for cartilage regeneration. In the present study, we used sodium periodate to oxidize methylcellulose and formed dialdehyde methylcellulose (DAC) after dialysis and freeze-drying process, DAC was further mixed with succinyl-chitosan (SUC) to form an DAC-SUC in situ forming hydrogel. The hydrogel is a stiffness, elastic-like and porous hydrogel according to the observation of SEM and rheological analysis. DAC-SUC13 hydrogel possess well cell-compatibility as well as biodegradability. Most bone marrow mesenchymal stem cells (BM-pMSCs) were alive in the hydrogel and possess chondrogenesis potential. According to the results of animal study, we found DAC-SUC13 hydrogel can function as a stem cell carrier to promote glycosaminoglycans and type II collagen synthesis in the osteochondral defects of porcine knee. These findings suggested that DAC-SUC13 hydrogel combined with stem cell is a potential treatment for cartilage defects repair in the future.
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- 2022
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24. Secular trend towards ultra-processed food consumption and expenditure compromises dietary quality among Taiwanese adolescents
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Yu-Chun Chen, Yi-Chen Huang, Yuan-Ting C. Lo, Hsing-Juan Wu, Mark L. Wahlqvist, and Meei-Shyuan Lee
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Ultra-processed food ,adolescent ,NOVA ,NAHSIT ,Taiwan ,dietary quality ,Nutrition. Foods and food supply ,TX341-641 - Abstract
Objective: To compare two Nutrition and Health Surveys in Taiwan (NAHSITs) 15–18 years apart to evaluate secular changes in ultra-processed food (UPF) consumption and expenditure among Taiwanese adolescents aged 16–18 years and the influences of such changes on dietary quality. Design: This cross-sectional study was based on two representative surveys (NAHSIT 1993–1996, n = 788; NAHSIT 2011, n = 1,274) of senior high school students. Dietary information and food expenditure were based on 24-h dietary recall. All food items were classified into original foods, processed culinary ingredients, processed foods, and UPFs based on NOVA criteria. Dietary quality was categorized as poor or good based on the mean of the Youth Healthy Eating Index–Taiwan Revised. Results: Compared to 1993–1996, adolescents consumed less energy from original foods (55 vs. 39%) but more from processed foods (12 vs. 18%) and UPFs (21 vs. 25%) in 2011, with no apparent gender differences. Those who consumed more UPFs had the lowest proportions of protein energy intake in both surveys (13.7 and 13.1%). Those who consumed more UPFs had higher levels of saturated fat and lower levels of monounsaturated and polyunsaturated fat, dietary fiber, and micronutrient intakes. The participants who consumed more UPFs and fewer original foods exhibited poorer dietary quality. Boys and girls exhibited equal UPF expenditure in both surveys despite an increase in UPF energy consumption. The adjusted odds ratios (95% confidence interval) were 1.33 (1.16–1.52) and 1.36 (1.10–1.69) for the risk of poor dietary quality with 10% increases in UPF energy intake and expenditure, respectively, in 2011. Conclusions: UPF energy consumption among Taiwanese adolescents increased between 1993–1996 and 2011. Observed trends in expenditure suggest that lower UPF costs influenced food choices during this period. Increasing UPF intake and expenditure was associated with poor dietary quality.
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- 2018
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25. Role of the orexin 2 receptor in palatable-food consumption-associated cardiovascular reactivity in spontaneously hypertensive rats
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Shang-Cheng Huang, Tzu-Ling Li, Yen-Hsien Lee, Yu-Wen E. Dai, Yu-Chun Chen, and Ling-Ling Hwang
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Medicine ,Science - Abstract
Abstract Hypertensive subjects often exhibit exaggerated cardiovascular reactivity. An overactive orexin system underlies the pathophysiology of hypertension. We examined orexin’s roles in eating-associated cardiovascular reactivity in spontaneously hypertensive rats (SHRs) and Wistar-Kyoto (WKY) rats. Results showed eating regular chow or palatable food (sucrose agar) was accompanied by elevated arterial pressure and heart rate. In both SHRs and WKY rats, the cardiovascular responses associated with sucrose-agar consumption were greater than that with regular-chow consumption. Additionally, SHRs exhibited greater cardiovascular responses than WKY rats did to regular-chow and palatable food consumption. Central orexin 2 receptor (OX2R) blockade attenuated sucrose-agar consumption-associated cardiovascular response only in SHRs. In both SHRs and WKY rats, OX2R blockade did not affect regular-chow consumption-associated cardiovascular responses. Greater numbers of c-Fos-positive cells in the rostral ventrolateral medulla (RVLM) and of c-Fos-positive orexin neurons in the dorsomedial hypothalamus (DMH) were detected in sucrose agar-treated SHRs, compared to regular chow-treated SHRs and to sucrose agar-treated WKY rats. Central OX2R blockade reduced the number of c-Fos-positive cells in the RVLM only in sucrose agar-treated SHRs. We concluded that in SHRs, orexin neurons in the DMH might be overactive during eating palatable food and may further elicit exaggerated cardiovascular responses via an OX2R-RVLM pathway.
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- 2018
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26. Ossification of the Posterior Longitudinal Ligament in Cervical Spine: Prevalence, Management, and Prognosis
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Jau-Ching Wu, Yu-Chun Chen, and Wen-Cheng Huang
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Ossification of posterior longitudinal ligament ,Cervical ,Prevalence ,Spinal cord injury ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Ossification of the posterior longitudinal ligament (OPLL) in the cervical spine and related neurological complications are not uncommon in East Asian countries. The estimated prevalence of cervical OPLL-related hospitalization is 7.7 per 100,000 person-years in Taiwan, and higher incidence rates have been observed in elderly and male patients. Although cervical OPLL is frequently insidious, it can eventually cause myelopathy and predispose patients to spinal cord injury (SCI). There are multiple options for managing cervical OPLL, ranging from observation to many kinds of surgical procedures, including posterior laminoplasty, laminectomy with or without fusion, anterior corpectomy with or without instrumentation, and circumferential decompression and fusion. None of these surgical approaches is free of complications. However, to date, there is still a lack of consensus regarding the choice of the surgical approach and the timing of surgical intervention. Cervical SCI and related neurological disabilities are more likely to occur in OPLL patients, who should therefore be cautioned regarding the possibility of a subsequent SCI if treated without surgery. This article aimed to review the prevalence, management strategies, and prognosis of cervical OPLL.
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- 2018
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27. Evaluation of Operational Monsoon Moisture Surveillance and Severe Weather Prediction Utilizing COSMIC-2/FORMOSAT-7 Radio Occultation Observations
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Yu-Chun Chen, Chih-Chien Tsai, Yi-chao Wu, An-Hsiang Wang, Chieh-Ju Wang, Hsin-Hung Lin, Dan-Rong Chen, and Yi-Chiang Yu
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monsoon moisture surveillance ,severe weather prediction ,COSMIC-2/FORMOSAT-7 ,radio occultation ,data assimilation ,typhoon Hagupit ,Science - Abstract
Operational monsoon moisture surveillance and severe weather prediction is essential for timely water resource management and disaster risk reduction. For these purposes, this study suggests a moisture indicator using the COSMIC-2/FORMOSAT-7 radio occultation (RO) observations and evaluates numerical model experiments with RO data assimilation. The RO data quality is validated by a comparison between sampled RO profiles and nearby radiosonde profiles around Taiwan prior to the experiments. The suggested moisture indicator accurately monitors daily moisture variations in the South China Sea and the Bay of Bengal throughout the 2020 monsoon rainy season. For the numerical model experiments, the statistics of 152 moisture and rainfall forecasts for the 2020 Meiyu season in Taiwan show a neutral to slightly positive impact brought by RO data assimilation. A forecast sample with the most significant improvement reveals that both thermodynamic and dynamic fields are appropriately adjusted by model integration posterior to data assimilation. The statistics of 17 track forecasts for typhoon Hagupit (2020) also show the positive effect of RO data assimilation. A forecast sample reveals that the member with RO data assimilation simulates better typhoon structure and intensity than the member without, and the effect can be larger and faster via multi-cycle RO data assimilation.
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- 2021
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28. Chemical Characteristics of Electron Shuttles Affect Extracellular Electron Transfer: Shewanella decolorationis NTOU1 Simultaneously Exploiting Acetate and Mediators
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Shiue-Lin Li, Yu-Jie Wang, Yu-Chun Chen, Shiu-Mei Liu, and Chang-Ping Yu
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extracellular electron transfer ,electron-balance calculation ,Shewanella decolorationis NTOU1 ,electron shuttle mediator ,outer membrane cytochrome ,Microbiology ,QR1-502 - Abstract
In the present study, we found that our isolate Shewanella decolorationis NTOU1 is able to degrade acetate under anaerobic condition with concomitant implementation of extracellular electron transfer (EET). With +0.63 V (vs. SHE) poised on the anode, in a 72-h experiment digesting acetate, only 2 mM acetate was consumed, which provides 6% of the electron equivalents derived from the initial substrate mass to support biomass (5%) and current generation (1%). To clarify the effects on EET of the addition of electron-shuttles, riboflavin, anthraquinone-2,6-disulfonate (AQDS), hexaammineruthenium, and hexacyanoferrate were selected to be spiked into the electrochemical cell in four individual experiments. It was found that the mediators with proton-associated characteristics (i.e., riboflavin and AQDS) would not enhance current generation, but the metal-complex mediators (i.e., hexaammineruthenium, and hexacyanoferrate) significantly enhanced current generation as the concentration increased. According to the results of electrochemical analyses, the i-V graphs represent that the catalytic current induced by the primitive electron shuttles started at the onset potential of −0.27 V and continued increasing until +0.73 V. In the riboflavin-addition experiment, the catalytic current initiated at the same potential but rapid saturated beyond −0.07 V; this indicated that the addition of riboflavin affects mediator secretion by S. decolorationis NTOU1. It was also found that the current was eliminated after adding 48 mM N-acetyl-L-methionine (i.e., the cytochrome inhibitor) when using acetate as a substrate, indicating the importance of outer-membrane cytochrome.
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- 2019
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29. Atypical Anxiety-Related Amygdala Reactivity and Functional Connectivity in Sant Mat Meditation
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Chenyi Chen, Yu-Chun Chen, Kuan-Ling Chen, and Yawei Cheng
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meditation ,amygdala reactivity ,emotional processing ,anxiety ,well-being ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
While meditation has drawn much attention in cognitive neuroscience, the neural mechanisms underlying its emotional processing remains elusive. Sant Mat meditators were recruited, who adopt a loving-kindness mode of meditation along with a vegetarian diet and an alcohol-restricted lifestyle and novices. We assessed their State-Trait Anxiety Inventory (STAI) and scanned their amygdala reactivity in response to an explicit and implicit (backward masked) perception of fearful and happy faces. In contrast with novices, meditators reported lower STAI scores. Meditators showed stronger amygdala reactivity to explicit happiness than to fear, whereas novices exhibited the opposite pattern. The amygdala reactivity was reduced in meditators regardless of implicit fear or happiness. Those who had more lifetime practice in meditation reported lower STAI and showed a weaker amygdala response to fear. Furthermore, the amygdala in meditators, relative to novices, had a stronger positive functional connectivity with the ventrolateral prefrontal cortex (PFC) to explicit happiness, but a more negative connectivity with the insula and medial orbitofrontal cortex (OFC) to explicit fear. Mediation analysis indicated the amygdala reactivity as the mediator for the linkage between meditation experience and trait anxiety. The findings demonstrate the neural correlates that underpin the beneficial effects of meditation in Sant Mat. Long-term meditation could be functionally coupled with the amygdala reactivity to explicit and implicit emotional processing, which would help reduce anxiety and potentially enhance well-being.
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- 2018
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30. Multi-Weather Evaluation of Nowcasting Methods Including a New Empirical Blending Scheme
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Hsin-Hung Lin, Chih-Chien Tsai, Jia-Chyi Liou, Yu-Chun Chen, Chung-Yi Lin, Lee-Yaw Lin, and Kao-Shen Chung
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nowcasting ,blending ,radar echo extrapolation ,radar data assimilation ,extrapolation adjusted by model prediction ,reflectivity ,Meteorology. Climatology ,QC851-999 - Abstract
This study utilized a radar echo extrapolation system, a high-resolution numerical model with radar data assimilation, and three blending schemes including a new empirical one, called the extrapolation adjusted by model prediction (ExAMP), to carry out 150 min reflectivity nowcasting experiments for various heavy rainfall events in Taiwan in 2019. ExAMP features full trust in the pattern of the extrapolated reflectivity with intensity adjustable by numerical model prediction. The spatial performance for two contrasting events shows that the ExAMP scheme outperforms the others for the more accurate prediction of both strengthening and weakening processes. The statistical skill for all the sampled events shows that the nowcasts by ExAMP and the extrapolation system obtain the lowest and second lowest root mean square errors at all the lead time, respectively. In terms of threat scores and bias scores above certain reflectivity thresholds, the ExAMP nowcast may have more grid points of misses for high reflectivity in comparison to extrapolation, but serious overestimation among the points of hits and false alarms is the least likely to happen with the new scheme. Moreover, the event type does not change the performance ranking of the five methods, all of which have the highest predictability for a typhoon event and the lowest for local thunderstorm events.
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- 2020
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31. Characteristics of Frequent Attenders Compared with Non-Frequent Attenders in Primary Care: Study of Remote Communities in Taiwan
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Shih-Chao Kang, Chun-Chi Lin, Chia-Chen Tsai, Yin-Han Lu, Chun-Feng Huang, and Yu-Chun Chen
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community medicine ,family medicine ,frequent attendance ,ICD-10 code ,primary care ,Taiwan ,Medicine - Abstract
Frequent attenders (FAs) have an impact on the medical resources and the quality of care. In Taiwan, the characteristics of FAs remain unclear in primary care. Outpatient data were screened from a central clinic within six surrounding fishing villages in northeastern Taiwan in 2017. FAs were defined as those who made >18 visits in one year, and those who made ≤18 visits were defined as non-frequent attenders (NFAs). Data of FAs and NFAs were collected and compared. The major diagnoses were reported using International Classifications of Diseases, Tenth Edition (ICD-10) codes. A total of 1586 subjects and 9077 visits were enrolled, including 119 FAs and 1467 NFAs. FAs had a more advanced age compared to NFAs. Both FAs and NFAs had more visits in summer. FAs had consumed high prescriptions and related costs. FAs also had higher therapeutic and first visit costs than NFAs. Comparing with age- sex-matched NFAs, FAs were positively associated with musculoskeletal diseases (M00-M99), hematological diseases (D50-D89), endocrine diseases (E00-E90), and mental disorders (F00-F99). Large-scale local datasets and suitable definitions of FAs for Taiwanese subjects are needed.
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- 2020
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32. Exposure to Mono-n-Butyl Phthalate in Women with Endometriosis and Its Association with the Biological Effects on Human Granulosa Cells
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Ya-Ching Chou, Yu-Chun Chen, Ming-Jer Chen, Ching-Wen Chang, Guan-Lin Lai, and Chii-Ruey Tzeng
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phthalate ,mono-n-butyl phthalate (mnbp) ,endometriosis ,granulosa cells ,mitochondrial membrane potential ,anti-mullerian hormone ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
To study the association between urinary phthalate metabolite levels, endometriosis, and their effects on human granulosa cells, we recruited patients who underwent laparoscopy to confirm endometriosis (n = 123) and control patients (n = 78). Liquid chromatography−tandem mass spectrometry was used to measure the following five urinary phthalate metabolites: mono-n-butyl phthalate (MnBP), mono(2-ethylhexyl) phthalate, monobenzyl phthalate, mono(2-ethyl-5-oxo-hexyl) phthalate, and mono(2-ethyl-5-hydroxyhexyl) phthalate. Urinary MnBP levels were higher in patients with endometriosis than in controls after multivariable logistic regression including the number of deliveries, body mass index, and use of medicine as covariables. MnBP correlates with other phthalate metabolites. Previous studies found that endometriosis was a detrimental condition for granulosa cells. In our study, we observed whether MnBP affected granulosa cells. MnBP treatment altered the gene expression of BIRC5, BUB1B, CDC20, cyclin B1, IL-1β, TNF-α, inhibin-B, StAR, and P450ssc and attenuated the ratio of the mitochondrial membrane potential in human granulosa cells. Moreover, MnBP decreased the expression of the anti-Mullerian hormone. These findings suggest that MnBP concentration is associated with endometriosis and may affect the health and steroidogenesis of human granulosa cells.
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- 2020
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33. Combining a Modified Particle Filter Method and Indoor Magnetic Fingerprint Map to Assist Pedestrian Dead Reckoning for Indoor Positioning and Navigation
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Fang-Shii Ning and Yu-Chun Chen
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indoor positioning ,magnetic fingerprint map ,pedestrian dead reckoning ,particle filter ,Chemical technology ,TP1-1185 - Abstract
Although advancement has been observed in global navigation satellite systems and these systems are widely used, they cannot provide effective navigation and positioning services in covered areas and areas that lack strong signals, such as indoor environments. Therefore, in recent years, indoor positioning technology has become the focus of research and development. The magnetic field of the Earth is quite stable in an open environment. Due to differences in building and internal structures, this type of three-dimensional vector magnetic field is widely available indoors for indoor positioning. A smartphone magnetometer was used in this study to collect magnetic field data for constructing indoor magnetic field maps. Moreover, an acceleration sensor and a gyroscope were used to identify the position of a mobile phone and detect the number of steps travelled by users with the phone. This study designed a procedure for measuring the step length of users. All obtained information was input into a pedestrian dead reckoning (PDR) algorithm for calculating the position of the device. The indoor positioning accuracy of the PDR algorithm was optimised using magnetic gradients of magnetic field maps with a modified particle filter algorithm. Experimental results reveal that the indoor positioning accuracy was between 0.6 and 0.8 m for a testing area that was 85 m long and 33 m wide. This study effectively improved the indoor positioning accuracy and efficiency by using the particle filter method in combination with the PDR algorithm with the magnetic fingerprint map.
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- 2019
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34. Is Excessive Polypharmacy a Transient or Persistent Phenomenon? A Nationwide Cohort Study in Taiwan
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Yi-Jen Wang, Shu-Chiung Chiang, Pei-Chen Lee, Yu-Chun Chen, Li-Fang Chou, Yueh-Ching Chou, and Tzeng-Ji Chen
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polypharmacy ,medication management ,drug prescriptions ,drug utilization ,national health programs ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Objectives: Target populations with persistent polypharmacy should be identified prior to implementing strategies against inappropriate medication use, yet limited information regarding such populations is available. The main objectives were to explore the trends of excessive polypharmacy, whether transient or persistent, at the individual level. The secondary objectives were to identify the factors associated with persistently excessive polypharmacy and to estimate the probabilities for repeatedly excessive polypharmacy.Methods: Retrospective cohort analyses of excessive polypharmacy, defined as prescription of ≥ 10 medicines at an ambulatory visit, from 2001 to 2013 were conducted using a nationally representative claims database in Taiwan. Survival analyses with log-rank test of adult patients with first-time excessive polypharmacy were conducted to predict the probabilities, stratified by age and sex, of having repeatedly excessive polypharmacy.Results: During the study period, excessive polypharmacy occurred in 5.4% of patients for the first time. Among them, 63.9% had repeatedly excessive polypharmacy and the probabilities were higher in men and old people. Men versus women, and old versus middle-aged and young people had shorter median excessive polypharmacy-free times (9.4 vs. 5.5 months, 5.3 vs. 10.1 and 35.0 months, both p < 0.001). Overall, the probabilities of having no repeatedly excessive polypharmacy within 3 months, 6 months, and 1 year were 59.9, 53.6, and 48.1%, respectively.Conclusion: Although male and old patients were more likely to have persistently excessive polypharmacy, most cases of excessive polypharmacy were transient or did not re-appear in the short run. Systemic deprescribing measures should be tailored to at-risk groups.
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- 2018
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35. Can mesenchymal stem cells and their conditioned medium assist inflammatory chondrocytes recovery?
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Yu-Chun Chen, Yu-Wei Chang, Kinn Poay Tan, Yi-Shan Shen, Yao-Horng Wang, and Chih-Hung Chang
- Subjects
Medicine ,Science - Abstract
Osteoarthritis (OA), one of the most common joint disease, affects more than 80% of the population aged 70 or over. Mesenchymal stem cells (MSCs) show multi-potent differentiation and self-renewal capability, and, after exposure to an inflammatory environment, also exhibit immunosuppressive properties. In this study, we have used a model of lipopolysaccharide (LPS)-stimulated chondrocytes to evaluate MSC anti-inflammatory efficacy. The anti-inflammatory mechanism was tested in two cell-contained culture systems: (i) MSC-chondrocyte indirect contact system and (ii) MSC-chondrocyte direct contact system, and one cytokine-only culture system: MSC-conditioned medium (CM) system. Results showed that MSCs reduced chondrocyte inflammation through both paracrine secretion and cell-to-cell contact. The inflammation-associated, and free-radical-related genes were down-regulated significantly in the direct contact system on 24 h, however, the TNF-α. IL-6 were upregulated and aggrecan, COLII were downregulated on 72 h in direct contact system. Moreover, we found CM produced by MSC possess well therapeutic effect on inflammatory chondorcyte, and the 10-fold concentrated MSC-conditioned medium could down-regulated chondorcyte synthesis inflammation-associated, and free-radical-related genes, such as TNF-α, IL-1β, IL-6 and iNOS even treated for 72 h. In conclusion, MSC-CM showed great potential for MSC-based therapy for OA.
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- 2018
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36. Holistic force-displacement behavior of porcine periodontal ligament—numerical simulation and in-vitro experiment
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Yao-Ning LEI, Chih-Yu CHEN, Yu-Chun CHEN, and Ting-Sheng LIN
- Subjects
periodontal ligament ,force-displacement behavior ,analytical model ,hyperelastic ,finite element analysis ,Science ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
In recent years, orthodontic treatments have become increasingly popular. In these treatments, orthodontic forces, which cause the absorption and deposition of alveolar bone, are applied through brackets and teeth in order to move the teeth to the expected position. The periodontal ligament (PDL) has a determinative role in dental biomechanics; however, the difficulty of predicting PDL behavior has limited the advancement of dental biomechanics. Therefore, this study intends to measure the biomechanical behavior of the PDL and then develop an analytical model to predict the holistic force-displacement relationship of the tooth. In this study, a porcine premolar, including the tooth, periodontal ligament, and alveolar bone, was harvested for experimental purposes. A custom-made apparatus was designed to measure the force-displacement relationship of the PDL. Three analytical models, including linear, exponential, and power functions, were adapted to fit the experimental results. In addition, three-dimensional finite element models were constructed from micro-CT sectional images, and the hyperelastic behavior (Mooney-Rilvin equation) of the PDL was simulated. The results showed that the PDL exhibited nonlinear biomechanical behavior. The power function was found to be a good fit for the force-displacement relationship of the PDL. Furthermore, it was found that the hyperelastic model could predict the biomechanical behavior of the PDL for tension less and equal to 20 N.
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- 2017
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37. Single bolus parecoxib attenuates sore throat after laryngeal microsurgery: A randomized double-blind control study
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Hui-Fang Huang, Pi-Ying Chang, Yu-Chun Chen, Kuang-Yi Tseng, Hung-Te Hsu, Kuang-I Cheng, and I-Cheng Lu
- Subjects
Cyclooxygenase-2 (COX-2) inhibitor ,Laryngeal microsurgery ,Parecoxib ,Medicine (General) ,R5-920 - Abstract
Laryngeal microsurgery is performed to assess disorders of the larynx. Parecoxib is the only parenterally administered selective cyclooxygenase (COX)-2 inhibitor widely used in acute pain control. The purpose of this study is to assess the analgesic effects of parecoxib compared with morphine for postoperative sore throat in patients undergoing laryngeal microsurgery. Fifty patients were randomly allocated to receive either parecoxib 0.5 mg/kg or morphine 50 μg/kg prior to anesthesia induction. General anesthesia was maintained with sevoflurane 2–4%. Postoperative sore throat and other outcomes were measured at a postanesthesia care unit (PACU) 4 hours and 24 hours postoperatively. The severity of postoperative sore throat was assessed by sore throat score as follows: none (0) = no pharyngeal or laryngeal discomfort; mild (1) = no pain at rest, but swallowing induced mild pain or discomfort; moderate (2) = constant pain without swallowing exacerbation; and severe (3) = constant pain with swallowing or respiratory exacerbation. The incidences of postoperative side effects (nausea, vomiting, itching, dizziness, and somnolence) were also recorded. Demographic data from the parecoxib (n = 25) and morphine (n = 25) groups did not differ significantly. The parecoxib group depicted similar sore throat scores as the morphine group at three measured postoperative time points. Patients requiring postoperative analgesics were comparable between the parecoxib group and morphine group (2/25, 8% vs. 3/25, 12%, p = 0.64). Overall postoperative adverse events were fewer in the parecoxib group than the morphine group (3/25, 12% vs. 9/25, 36%, p = 0.047). Both parecoxib and morphine are effective to attenuate postoperative sore throat after laryngeal microsurgery. Parecoxib may be an effective and well-tolerated injectable analgesic to manage postoperative sore throat after laryngeal microsurgery.
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- 2014
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38. On the synthesis and microstructure analysis of high performance MnBi
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Yu-Chun Chen, Simon Sawatzki, Semih Ener, Hossein Sepehri-Amin, Andreas Leineweber, Giuliano Gregori, Fei Qu, Shreyas Muralidhar, Tadakatsu Ohkubo, Kazuhiro Hono, Oliver Gutfleisch, Helmut Kronmüller, Gisela Schütz, and Eberhard Goering
- Subjects
Physics ,QC1-999 - Abstract
Highly anisotropic MnBi powder with over 90 wt% low-temperature phase can be prepared using conventional arc-melting and 2 hour-low energy ball milling (BM) followed by magnetic separation. After proper alignment, the purified Mn55Bi45(Mn45Bi55) powder show remarkable magnetic properties: mass remanence of 71(65) Am2/kg and coercivity of 1.23(1.18) T at 300 K. The nominal maximum energy product of 120 kJ/m3 is achieved in the purified 2h-BM Mn55Bi45 powder, close to theoretical value of 140.8 kJ/m3. The Mn55Bi45(Mn45Bi55) bulk magnets show the highest volume remanence of 0.68(0.57) T at 300 K, while they were consolidated at 573(523) K by a pressure of 200 MPa for 5 minutes using hot-compaction method. In addition to the observed grain size, the coercivity of the hot-compacted samples at 300 K was found to be strongly related to the amount of metallic Mn and Bi residue at the grain-boundary. Our study proves that the magnetic properties of the Mn45Bi55 bulk magnets are stable up to 500 K, and the nominal (BH)max values are still above 40 kJ/m3 at 500 K showing the potential ability for high-temperature applications.
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- 2016
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39. Size Distribution of Colistin Delivery by Different Type Nebulizers and Concentrations During Mechanical Ventilation
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Ching-Yi Liu, Hsin-Kuo Ko, James B. Fink, Gwo-Hwa Wan, Chung-Chi Huang, Yu-Chun Chen, and Hui-Ling Lin
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inhaled colistin ,jet nebulizer ,vibrating mesh nebulizer ,drug concentration ,mechanical ventilation ,inhaled drug mass ,particle size distributions ,Pharmacy and materia medica ,RS1-441 - Abstract
Although aerosol delivery through mechanical ventilators has been used to administer various medications, little is known of administration with colistin. This in vitro evaluation aimed to evaluate size distribution of colistin delivery by different types of nebulizers and concentrations during mechanical ventilation. Colistin methanesulfonate (colistin) for injection was dissolved in 6 mL of distilled water to produce a low concentration (L; 156 mg) and a high concentration (H; 312 mg). A dose volume of 6 mL was placed in a vibrating mesh nebulizer (VMN) and a jet nebulizer (JN). The inhaled mass (mean ± SD) of the VMN-L (53.80 ± 14.79 mg) was greater than both the JN-L (19.82 ± 3.34 mg, P = 0.001) and JN-H (31.72 ± 4.48 mg, P = 0.017). The nebulization time of the VMN-L (42.35 ± 2.30 min) was two times longer than the JN-L (21.12 ± 0.8 min) or JN-H (21.65 ± 0.42 min; P < 0.001). The mass median aerodynamic distal to the endotracheal tube was within a similar range at 2.03 to 2.26 μm (P = 0.434), independent of neb or formulation concentration. In conclusion, the VMN-L yields greater inhaled mass than the JN with either concentration. Therefore, a standard nominal dose of colistin results in a higher delivered dose during mechanical ventilation with a VMN compared with a JN and may be considered the preferred device. If JN must be used, multiple doses of low concentration colistin may compensate for poor delivery performance.
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- 2019
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40. Multilevel cervical disc arthroplasty: a review of optimal surgical management and future directions.
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Tsung-Hsi Tu, Ching-Ying Wang, Yu-Chun Chen, and Jau-Ching Wu
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- 2023
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41. Evaluating Production Time Buffer for Precast Fabrication
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Chien-Ho Ko and Yu-Chun Chen
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Fuzzy logic ,precast ,finished goods inventory ,time buffer ,Industrial engineering. Management engineering ,T55.4-60.8 - Abstract
Precast fabricators strive for business success in delivering products on time. To achieve this goal, fabricators start manufacturing once they receive specific design information. However, this strategy induces wasteful inventory. The objective of this study is to develop a Time Buffer Evaluation Model (TBEM) to promptly deliver products and maintain a smaller inventory. This model consists of two stages. The first, by using fuzzy logic, considers factors that influence construction duration. The second stage evaluates a time buffer by considering the tardiness penalty and crashing costs. In this study, one real case is tested to demonstrate the applicability of the proposed method. The application results show that the developed TBEM can reduce the level of finished goods inventory without changing production resources.
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- 2012
42. The neural correlates of emotional conflict monitoring as an early manifestation of affective and cognitive declines in persons with Type 2 diabetes.
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Yu-Hsin Chen, Chenyi Chen, Hong-Yu Jian, Yu-Chun Chen, Yang-Teng Fan, Chih-Yung Yang, and Yawei Cheng
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- 2023
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43. Serum estradiol levels predict survival and acute kidney injury in patients with septic shock--a prospective study.
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Jia-Yih Feng, Kuan-Ting Liu, Edward Abraham, Cheng-Yu Chen, Po-Yi Tsai, Yu-Chun Chen, Yu-Chin Lee, and Kuang-Yao Yang
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Medicine ,Science - Abstract
Sex hormones have diverse immunomodulatory effects that may be involved in the pathogenesis of sepsis. However, the roles of serum sex hormones in predicting outcomes and the severity of organ dysfunction, especially acute kidney injury (AKI), in septic shock patients remains controversial. We prospectively enrolled 107 clinically diagnosed pneumonia-related septic shock patients and serum sex hormone levels were measured on the day of shock onset. The aim of the present study was to investigate the predictive values of serum sex hormones levels for 28-day mortality and organs dysfunction, especially AKI. Compared with survivors, serum levels of progesterone (p40 pg/mL (p = 0.047) and APACHE II score ≥25 (p = 40 pg/mL was also an independent predictor of concomitant AKI (p = 0.002) and correlated well with severity of renal dysfunction using RIFLE classification. Elevated serum estradiol levels also predicted the development of new AKI within 28 days of shock onset (p = 0.013). In conclusion, serum estradiol levels appear to have value in predicting 28-day mortality in septic shock patients. Increased serum estradiol levels are associated with higher severity of concomitant AKI and predict development of new AKI.
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- 2014
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44. Hypervalent Iodine(III)-Induced Domino Oxidative Cyclization for the Synthesis of Cyclopenta[b]furans
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Mei-Huey Lin, Yu-Chun Chen, Shih-Hao Chiu, Yun-Fan Chen, and Tsung-Hsun Chuang
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cyclopenta[b]furan ,hypervalent iodine(III) ,domino oxidative cyclization ,diacetoxyiodobenzene ,cycloisomerization ,Organic chemistry ,QD241-441 - Abstract
A new strategy for cyclopenta[b]furan synthesis mediated by hypervalent iodine(III) has been described. The approach employs diacetoxyiodobenzene-induced initial dehydrogenation to a putative trienone intermediate and triggered sequential cycloisomerization to form the cyclo-penta[b]furan targets.
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- 2016
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45. The anti-anxiety drug lorazepam changes implicit behaviors but not explicit evaluations of sense of agency under authoritative pressure: A functional magnetic resonance imaging study.
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Chenyi Chen, Marcelo Martínez, Róger, Yu-Chun Chen, Yang-Teng Fan, and Yawei Cheng
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FUNCTIONAL magnetic resonance imaging ,TRANQUILIZING drugs ,LORAZEPAM ,CATATONIA ,DIAGNOSTIC imaging ,PREFRONTAL cortex ,SOCIAL anxiety - Abstract
Previous research on coercion has neglected the fact that agents under authoritative pressure may also suffer from coercive power, which can trigger anxiety-like emotional negativity on its victims. Furthermore, high levels of neuroticism and/or anxiety have been found to be associated with the compliance of various forms of social pressure. In this study, we investigate the effects of the anxiolytic GABA
A (gamma-Aminobutyric acid) modulator, lorazepam, on behavioral and neural responses to coercive power. Here, we applied a virtual obedience to authority paradigm alongside lorazepam administration (versus placebo), and during functional magnetic resonance imaging scanning. Our results show that lorazepam administration exerted differential effects on the reaction times (RTs) when initiating harming versus helping behaviors, with longer harming RTs compared to helping RTs, despite comparable subjective ratings regarding perceived coercion. Coercive harming significantly increased activity in the amygdala, hippocampus, orbitofrontal cortex, and dorsolateral prefrontal cortex (dlPFC). Lorazepam administration decreased amygdala and hippocampus activity, but increased dlPFC and right temporoparietal junction activations. The lower activity in the hippocampus predicted higher ratings for perceived coercion. Furthermore, lorazepam significantly decreased the functional connectivity of the hippocampus with the dlPFC during coercive harming. In conclusion, we provide evidence –by incorporating multimodal indices, including neuroimaging, neuropharmacological interventions, and behavioral assessments– to posit that the GABAA agonist, lorazepam, might aid as a possible intervention in service of coping strategies against coercion. [ABSTRACT FROM AUTHOR]- Published
- 2022
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46. The impact of type of assistance on characteristics of peritonitis in elderly peritoneal dialysis patients
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Hsieh, Chun-Yih, Fang, Ji-Tseng, Yang, Chih-Wei, Lai, Ping-Chin, Hu, Sau-An, Chen, Yu-Ming, Yu, Chun-Chen, Tian, Ya-Chung, Chien, Chu-Chun, and Hung, Cheng-Chieh
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- 2010
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47. The impact of nationwide education program on clinical practice in sepsis care and mortality of severe sepsis: a population-based study in Taiwan.
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Yu-Chun Chen, Shih-Chieh Chang, Christy Pu, and Gau-Jun Tang
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Medicine ,Science - Abstract
OBJECTIVES:We investigated the effect of a nationwide educational program following surviving sepsis campaign (SSC) guidelines. Physicians' clinical practice in sepsis care and patient mortality rate for severe sepsis were analyzed using a nationally representative cohort. METHODS:Hospitalizations for severe sepsis with organ failure from 1997 to 2008 were extracted from Taiwan's National Health Insurance Research Database (NHIRD), and trends in sepsis incidence and mortality rates were analyzed. A before-and-after study design was used to evaluate changes in the utilization rates of SSC items and changes in severe sepsis mortality rates occurred after a national education program conducted by the Joint Taiwan Critical Care Medicine Committee since 2004. A total of 39,706 hospitalizations were analyzed, which consisted of a pre-intervention cohort of 14,848 individuals (2000-2003) and a post-intervention cohort of 24,858 individuals (2005-2008). RESULTS:The incidence rate of severe sepsis increased from 1.88 per 1,000 individuals in 1997 to 5.07 per 1,000 individuals in 2008. The cumulative mortality rate decreased slightly from 48.2% for the pre-intervention cohort to 45.9% for the post-intervention cohort. The utilization rates of almost all SSC items changed significantly between the pre-intervention and post-intervention cohorts. These changes of utilization rates were found to be associated with mild reduction in mortality rate. CONCLUSION:The nationwide education program through a national professional society has a significant impact on physicians' clinical practice and resulted in a slight but significant reduction of severe sepsis mortality rate.
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- 2013
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48. Synthesis of 2-Alkenyl-2H-indazoles from 2-(2-Carbonylmethyl)-2H-indazoles
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Mei-Huey Lin, Kung-Yu Liang, Chang-Hsien Tsai, Yu-Chun Chen, Hung-Chang Hsiao, Yi-Syuan Li, Chung-Hao Chen, and Hau-Chun Wu
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indazoles ,coumarin ,regioselective alkylation ,styrene ,fluorescence ,Organic chemistry ,QD241-441 - Abstract
A procedure has been developed for synthesis of 2-alkenyl-2H-indazoles starting from 2-(2-carbonylmethyl)-2H-indazoles, which are prepared by gallium/aluminium- and aluminium-mediated, direct, regioselective alkylation of indazoles with α-bromocarbonyl compounds. The structure of 3-(2H-indazol-2-yl)-2H-chromen-2-one was proven by X-ray crystallography. The styrene- and coumarin-2H-indazoles produced by using the new method were found to have interesting fluorescence properties.
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- 2016
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49. A Wearable Channel Selection-Based Brain-Computer Interface for Motor Imagery Detection
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Chi-Chun Lo, Tsung-Yi Chien, Yu-Chun Chen, Shang-Ho Tsai, Wai-Chi Fang, and Bor-Shyh Lin
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brain-computer interface ,motor imagery ,channel selection ,spatial filter ,Chemical technology ,TP1-1185 - Abstract
Motor imagery-based brain-computer interface (BCI) is a communication interface between an external machine and the brain. Many kinds of spatial filters are used in BCIs to enhance the electroencephalography (EEG) features related to motor imagery. The approach of channel selection, developed to reserve meaningful EEG channels, is also an important technique for the development of BCIs. However, current BCI systems require a conventional EEG machine and EEG electrodes with conductive gel to acquire multi-channel EEG signals and then transmit these EEG signals to the back-end computer to perform the approach of channel selection. This reduces the convenience of use in daily life and increases the limitations of BCI applications. In order to improve the above issues, a novel wearable channel selection-based brain-computer interface is proposed. Here, retractable comb-shaped active dry electrodes are designed to measure the EEG signals on a hairy site, without conductive gel. By the design of analog CAR spatial filters and the firmware of EEG acquisition module, the function of spatial filters could be performed without any calculation, and channel selection could be performed in the front-end device to improve the practicability of detecting motor imagery in the wearable EEG device directly or in commercial mobile phones or tablets, which may have relatively low system specifications. Finally, the performance of the proposed BCI is investigated, and the experimental results show that the proposed system is a good wearable BCI system prototype.
- Published
- 2016
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50. Concomitant pulmonary tuberculosis in hospitalized healthcare-associated pneumonia in a tuberculosis endemic area: a multi-center retrospective study.
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Jia-Yih Feng, Wen-Feng Fang, Chieh-Liang Wu, Chong-Jen Yu, Meng-Chih Lin, Shih-Chi Ku, Yu-Chun Chen, Chang-Wen Chen, Chih-Yen Tu, Wei-Juin Su, and Kuang-Yao Yang
- Subjects
Medicine ,Science - Abstract
BACKGROUND: In tuberculosis (TB) endemic areas, Mycobacterium tuberculosis is an important but easily misdiagnosed pathogen in community-acquired pneumonia (CAP). However, the occurrence of concomitant pulmonary tuberculosis (PTB) in hospitalized healthcare-associated pneumonia (HCAP) has never been investigated. METHODS AND FINDINGS: Seven hundred and one hospitalized HCAP and 934 hospitalized CAP patients from six medical centers in Taiwan were included in this nationwide retrospective study. Concomitant PTB was defined as active PTB diagnosed within 60 days of admission due to HCAP or CAP. The predictors for concomitant PTB and the impact of PTB on the outcomes of pneumonia were investigated. Among the enrolled subjects, 21/701 (3%) of the HCAP patients and 25/934 (2.7%) of the CAP patients were documented to have concomitant PTB. In multivariate analysis, a history of previous anti-TB treatment (OR = 5.84, 95% CI: 2.29-20.37 in HCAP; OR = 3.33, 95% CI: 1.09-10.22 in CAP) and escalated pneumonia severity index (PSI) scores (OR = 1.014, 95% CI: 1.002-1.026, in HCAP; OR = 1.013, 95% CI: 1.001-1.026, in CAP) were independent predictors for concomitant PTB in both CAP and HCAP patients. Regarding treatment outcomes, HCAP patients with concomitant PTB were associated with more acute respiratory failure within 48 hours of admission (47.6% vs. 22.6%, p = 0.008), higher intensive care unit admission rate (61.9% vs. 35.7%, p = 0.014), longer hospitalization (39.6±34.1 vs. 23.7±27 days, p = 0.009), and higher in-hospital mortality (47.6% vs. 26.3%, p = 0.03) than those without concomitant PTB. Exposure to certain groups of antibiotics for the treatment of pneumonia was not associated with the occurrence of concomitant PTB. CONCLUSIONS: In HCAP patients, the occurrence of concomitant PTB is comparable with that in CAP patients and associated with higher PSI scores, more acute respiratory failure, and higher in-hospital mortality.
- Published
- 2012
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