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Abstract We present a highly sensitive Lorentz-force magnetic micro-sensor capable of measuring low field values. The magnetometer consists of a silicon micro-beam sandwiched between two electrodes to electrostatically induce in-plane vibration and to detect the output current. The method is based on measuring the resonance frequency of the micro-beam around the buckling zone to sense out-of-plane magnetic fields. When biased with a current of 0.91 mA (around buckling), the device has a measured sensitivity of 11.6 T−1, which is five orders of magnitude larger than the state-of-the-art. The measured minimum detectable magnetic field and the estimated resolution of the proposed magnetic sensor are 100 µT and 13.6 µT.Hz−1/2, respectively. An analytical model is developed based on the Euler–Bernoulli beam theory and the Galerkin discretization to understand and verify the micro-sensor performance. Good agreement is shown between analytical results and experimental data. Furthermore, the presented magnetometer is promising for measuring very weak biomagnetic fields.

Abstract CTX-Ms are encoded by bla CTX-M genes and are widely distributed extended-spectrum β-lactamases (ESBLs). They are the most important antimicrobial resistance (AMR) mechanism to β-lactam antibiotics in the Enterobacteriaceae. However, the role of transmissible AMR plasmids in the dissemination of bla CTX-M genes has scarcely been studied in Africa where the burden of AMR is high and rapidly spreading. In this study, AMR plasmid transmissibility, replicon types and addiction systems were analysed in CTX-M-producing Escherichia coli clinical isolates in Ethiopia with a goal to provide molecular insight into mechanisms underlying such high prevalence and rapid dissemination. Of 100 CTX-Ms-producing isolates obtained from urine (84), pus (10) and blood (6) from four geographically distinct healthcare settings, 75% carried transmissible plasmids encoding for CTX-Ms, with CTX-M-15 being predominant (n = 51). Single IncF plasmids with the combination of F-FIA-FIB (n = 17) carried the bulk of bla CTX-M-15 genes. In addition, IncF plasmids were associated with multiple addiction systems, ISEcp1 and various resistance phenotypes for non-cephalosporin antibiotics. Moreover, IncF plasmid carriage is associated with the international pandemic E. coli ST131 lineage. Furthermore, several CTX-M encoding plasmids were associated with serum survival of the strains, but less so with biofilm formation. Hence, both horizontal gene transfer and clonal expansion may contribute to the rapid and widespread distribution of bla CTX-M genes among E. coli populations in Ethiopian clinical settings. This information is relevant for local epidemiology and surveillance, but also for global understanding of the successful dissemination of AMR gene carrying plasmids.

Lupus nephritis (LN) is kidney involvement of systematic lupus erythematous that ranges from mild to severe and occurs in 60% of adult patients. Despite advances in therapy, LN morbidity and mortality remains high. There is a paucity of data regarding adult LN patient's treatment outcome, survival status, and associated factors in developing countries, particularly in Ethiopia. This study aimed to assess the treatment outcome, survival status, and associated factors of adult patients treated for LN in two selected tertiary hospitals [Tikur Anbessa Specialized Hospital (TASH) and St. Paul's Hospital Millennium Medical College (SPHMMC)] of Addis Ababa, Ethiopia. A hospital-based retrospective cross-sectional multicenter study was conducted from January 1, 2016 to January 1, 2021. Socio-demographic, clinical, and treatment-related data were collected from patient's medical records by using a structured abstraction checklist. Descriptive statistics were used to summarize the quantitative data as appropriate. The modified Aspreva Lupus Management Study (mALMS) criteria was applied to categorize LN treatment outcomes into complete, partial, and non-response. Multinomial logistic regression analysis was performed to identify predictors of LN treatment outcome. Patients' survival was estimated by using Kaplan-Meier and Cox proportion regression analysis. P value < 0.05 was considered to declare statistical significance. A total of 200 LN patients were included in the final analysis. Amongst these, the majority of them (91.5%) were females. The median age of the patients was 28 (15-60) years. The mean duration of treatment follow-up was 28 months. The commonly prescribed immunosuppressive drugs during both the induction (49.5%) and maintenance (60%) phases were a combination of mycophenolate mofetil with prednisolone. Complete, partial, and non-responses at the last follow-up visit accounted for 66.5%, 18.0%, and 15.5%, respectively. Patient survival at the last follow-up visit was more than 90% for patients with complete response to the induction therapy. Non-response at the last follow-up visit was significantly associated with severe disease activity index (adjusted odds ratio [AOR] = 6.25, 95% confidence interval [CI] 1.49-26.10), presence of comorbidity (AOR = 0.21, 95% CI 0.05-0.92), baseline leucopenia (AOR = 14.2, 95% CI 1.04-201.3), partial response at the end of induction therapy (AOR = 32.63, 95% CI 1.4-736.0), and duration of induction therapy of greater than 6 months (AOR = 19.47, 95% CI 1.5-258.8). This study unveiled that lower numbers of LN patients were presented with non-response at the last follow-up visit and non-response to induction therapy was associated with lower patients' survival rates compared with complete or partial response., (© 2024. The Author(s).)

Nascent studies showed that patients with chronic medical illnesses such as diabetes mellitus (DM) and HIV/AIDS are highly vulnerable to face both treatment burden and regimen fatigue. However, an attempt made so far in this sphere in sub-Saharan African health care context is dearth. Thus, this study aimed to determine the level of treatment burden and regimen fatigue of diabetic and HIV patients attending adult diabetic and ART clinics of TASH and explore patients' and health care workers' propositions to reduce treatment burden and regimen fatigue. An explanatory sequential mixed methods study was conducted at the adult HIV and DM clinics of TASH, Addis Ababa, Ethiopia from February 01-March 30, 2022. Simple random and purposive sampling techniques were employed to select participants for quantitative and qualitative studies, respectively. Descriptive analysis was done to summarize the quantitative data. Logistic and linear regression analyses were performed to identify predictors of treatment burden and regimen fatigue, respectively. P value < 0.05 was considered statistically significant. Qualitative data was analyzed by using a thematic analysis. A total of 300 patients (200 diabetes and 100 HIV) were included in the quantitative study. For the qualitative study, 14 patients and 10 health care workers (six nurses and four medical doctors) were included. Participants' mean global Treatment Burden Questionnaire (TBQ) and Treatment Regimen Fatigue Scale (TRFS) score were 28.86 ± 22.13 and - 42.82 ± 17.45, respectively. Roughly, 12% of patients experienced a high treatment burden. The presence of two or more comorbidities (adjusted odds ratio [AOR] = 7.95, 95% confidence interval [CI] 1.59-39.08), daily ingestion of more than five types of prescribed medications (AOR = 6.81, 95%CI 1.59-29.14), and good knowledge about DM and/or HIV (AOR = 0.33, 95%CI 0.12-0.92) were predictors of treatment burden. Poor availability of medications (β = 0.951, p < 0.001) was the only predictor of regimen fatigue. Patients and health care workers primarily proposed to foster self-care efficacy, advance administrative services of the clinic and hospital, and improve healthcare system provision. The findings of this study unveiled that a considerable proportion of patients experienced low levels of treatment burden and regimen fatigue. This study showed that boosting the patients' self-care efficacy, upgrading administrative services of the clinic and hospital, and promoting the healthcare system provision had enormous significance in reducing treatment burden and regimen fatigue. Therefore, when designing patient-specific healthcare interventions for both HIV and diabetic patients' various factors affecting both treatment burden and regimen fatigue should be considered to achieve the desired goals of therapy., (© 2024. The Author(s).)

Emerging evidences hypothesized that patients with heart failure are susceptible to experience treatment burden. Despite this fact, no attempt was made so far to address this neoteric construct in the sub-Saharan African health care context. Hence, this study aimed to assess patients' and health care providers' perspectives on how to decrease treatment burden among patients with heart failure attending the adult cardiac clinic of Tikur Anbessa Specialized Hospital (TASH). An explanatory sequential mixed methods study was conducted at the adult cardiac clinic of TASH, Addis Ababa, Ethiopia from August 01 to September 30, 2021. Simple random and purposive sampling techniques were employed to select participants for quantitative and qualitative studies, respectively. Descriptive analysis was done to summarize the quantitative data. Logistic regression analysis was performed to identify predictors of treatment burden. P value < 0.05 was considered to declare statistical significance. Qualitative data were analyzed by using thematic analysis. A total of 325 patients were enrolled in the quantitative study. For the qualitative study, 14 patients and 11 health care providers (five nurses and six medical doctors) were included. Participants mean global Treatment Burden Questionnaire (TBQ-15) score was 27.22 ± 19.35. Approximately 12% (n = 38) patients indicated high treatment burden (TBQ-15 global score ≥ 59) with a median global score of 63(60-69). Higher education level (adjusted odds ratio [AOR] = 6.66, 95% confidence interval [CI]: 1.16-38.43), presence of two and more comorbidities (AOR = 2.74, 95%CI: 1.02-7.39), daily intake of more than five pills (AOR = 7.38, 95%CI: 2.23-24.41), poor medication availability (AOR = 3.33, 95%CI: 1.33-8.36), presence of medication adverse effects (AOR = 4.04, 95%CI: 1.63-10.03), and higher monthly cost of medication (AOR = 5.29, 95%CI: 1.46-19.18) were predictors of treatment burden. Patients and healthcare providers' propositions were primarily focused on improving self-care management, structural organization of the clinic and hospital, and healthcare system provision. Our findings demonstrated that a substantial proportion of patients faced low levels of treatment burden. This study unveiled that improving self-care management, structural organization of the clinic, and healthcare system provision had paramount importance to reducing treatment burden. Hence, factors affecting treatment burden should be considered when designing tailored healthcare interventions for patients with heart failure., (© 2022. The Author(s).)