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In rural Canada, the majority of prehospital care is provided by basic life support paramedics, who cannot administer opioids or parenteral analgesics. Patients requiring transfer to a higher level of care have limited options for pain control. We aim to determine if ambulance-based patient-controlled analgesia (PCA) is feasible during inter-facility transfers.This is a prospective non-consecutive cohort feasibility study conducted in the East Kootenay region of British Columbia from 2016 to 2020. Patients in acute pain from an illness or injury requiring an opioid and transfer to a higher level of care were offered PCA. The study used respiratory depression as a marker of safety, assessed if PCA during transport provided efficacious analgesia, measured satisfaction scores from patients and paramedics, and tracked adverse events.84 patients received PCA. The majority had orthopaedic trauma and the average transfer time was 3 h 22 min. The average pain score at the start and end of the transfer was unchanged, at 4 out of 10. Patient and paramedic satisfaction scores at the end of the transfer were 4.6 and 4.7 out of 5, respectively. Three out of the 84 patients (3.6%) had desaturation episodes below or equal to 90% oxygen saturation; however, all resolved with supplemental oxygen.Ambulance-based PCA is feasible and has a high level of satisfaction among paramedics and patients. It has significant potential for inter-facility transport in rural regions in Canada where ambulances are staffed with paramedics who cannot administer opioids or other parenteral analgesics.RéSUMé: CONTEXTE: Dans les régions rurales du Canada, la majorité des soins préhospitaliers sont prodigués par des ambulanciers paramédicaux essentiels qui ne peuvent administrer d’opioïdes ou d’analgésiques parentéraux. Les patients nécessitant un transfert vers un niveau de soins supérieur ont des options limitées pour le contrôle de la douleur. Notre objectif est de déterminer si l'analgésie contrôlée par le patient (ACP) en ambulance est possible lors des transferts entre établissements. MéTHODES: Il s'agit d'une étude de faisabilité prospective de cohorte non consécutive menée dans la région de Kootenay Est en Colombie-Britannique de 2016 à 2020. Les patients souffrant de douleurs aiguës dues à une maladie ou à une blessure nécessitant un opioïde et un transfert vers un niveau de soins supérieur se sont vu proposer une APC. L'étude a utilisé la dépression respiratoire comme marqueur de sécurité, a évalué si l'ACP pendant le transport fournissait une analgésie efficace, a mesuré les scores de satisfaction des patients et du personnel paramédical, et a suivi les événements indésirables. RéSULTATS: 84 patients ont reçu une ACP. La majorité avait un traumatisme orthopédique et le temps de transfert moyen était de 3 h 22 min. Le score moyen de douleur au début et à la fin du transfert était inchangé, à 4 sur 10. Les scores de satisfaction des patients et des ambulanciers paramédicaux à la fin du transfert étaient de 4,6 et 4,7 sur 5, respectivement. Trois des 84 patients (3,6%) ont connu des épisodes de désaturation inférieurs ou égaux à 90% de saturation en oxygène; cependant, tous se sont résorbés avec l'apport d'oxygène supplémentaire. INTERPRéTATION: L'ACP en ambulance est faisable et présente un haut niveau de satisfaction parmi les paramédicaux et les patients. Il présente un potentiel important pour le transport inter-établissements dans les régions rurales du Canada où les ambulances sont dotées de personnel paramédical qui ne peut pas administrer d'opioïdes ou d'autres analgésiques parentéraux.

We study the inverse problem in Optical Tomography of determining the optical properties of a medium $\Omega\subset\mathbb{R}^n$, with $n\geq 3$, under the so-called diffusion approximation. We consider the time-harmonic case where $\Omega$ is probed with an input field that is modulated with a fixed harmonic frequency $\omega=\frac{k}{c}$, where $c$ is the speed of light and $k$ is the wave number. Under suitable conditions that include a range of variability for $k$, we prove a result of H\"older stability of the derivatives of the absorption coefficient $\mu_a$ of any order at the boundary $\partial\Omega$ in terms of the measurements, in the case when the scattering coefficient $\mu_s$ is assumed to be known. The stability estimates rely on the construction of singular solutions of the underlying forward elliptic system, which extend results obtained in J. Differential Equations 84 (2): 252-272 for the single elliptic equation., Comment: arXiv admin note: substantial text overlap with arXiv:2002.01828

Background North America is in the midst of an unabated opioid overdose epidemic due to the increasing non-medical use of fentanyl and ultra-potent opioids. Naloxone is an effective antidote to opioid toxicity, yet its optimal dosing in the context of fentanyl and ultra-potent opioid overdoses remains unknown. This review aims to determine the relationship between the first empiric dose of naloxone and reversal of toxicity, adverse events, and the total cumulative dose required among patients with undifferentiated opioid overdoses and those with suspected toxicity from ultra-potent opioids. Secondary objectives include evaluating the relationship between the cumulative naloxone dose and toxicity reversal and adverse events, among patients with undifferentiated opioid overdoses and those with suspected toxicity from ultra-potent opioids. Methods To identify studies, we will search MEDLINE, Embase, CENTRAL, DARE, CDAG, CINAHL, Science Citation Index, multiple trial registries, and the gray literature. Included studies will evaluate patients with suspected or confirmed opioid toxicity from undifferentiated opioids and ultra-potent opioids, who received an empiric and possibly additional doses of naloxone. The main outcomes of interest are the relationship between naloxone dose and toxicity reversal and adverse events. We will include controlled and non-controlled interventional studies, observational studies, case reports/series, and reports from poison control centers. We will extract data and assess study quality in duplicate with discrepancies resolved by consensus or a third party. We will use the Downs and Black and Cochrane risk of bias tools for observational and randomized controlled studies. If we find sufficient variation in dose, we will fit a random effects one-stage model to estimate a dose-response relationship. We will conduct multiple subgroup analyses, including by type of opioid used and by suspected high and low prevalence of ultra-potent opioid use based on geographic location and time of the original studies. Discussion Our review will include the most up-to-date available data including ultra-potent opioids to inform the current response to the opioid epidemic, addressing the limitations of recent reviews. We anticipate limitations relating to study heterogeneity. We will disseminate study results widely to update overdose treatment guidelines and naloxone dosing in Take Home Naloxone programs. Electronic supplementary material The online version of this article (10.1186/s13643-019-1048-y) contains supplementary material, which is available to authorized users.

Computed Tomography (CT) scans help diagnose and triage life-threatening and time-sensitive emergency conditions, but most rural hospitals in British Columbia do not have access to a local CT scanner. We investigate how many transfers from a rural British Columbia hospital were for CT scans and describe the time delays to emergent CT imaging.This was a prospective cohort study, over a 1-year period, on all patients requiring a transfer from the Golden and District Hospital, located 247 km from the closest CT scanner. Data collection forms were completed prospectively and the main measurements included age, transport triage level, reason for transfer, referral hospital, transfer request time, and CT scan time. The time interval between the CT request and CT imaging was calculated and represents the 'delay to CT scan' interval.The study hospital received 8672 emergency department (ED) visits and 220 were transferred to referral centres (2.5%). 61% of all transfers received a CT scan. Transfers for time-sensitive emergencies took an average of 6 h 52 min. Patients with acute stroke experienced a 4 h 44 min time interval. Less urgent and non-urgent conditions entailed an even greater time delay.This study highlights that the lack of a rural CT scanner is associated with increased transfers and significant time delays. Improving access to CT scanners for rural communities may be one of the many steps in addressing healthcare disparities between rural and urban communities.RéSUMé: OBJECTIFS: La tomodensitométrie (TDM) aide à diagnostiquer et à trier les situations d'urgence qui mettent la vie en danger et pour lesquelles le temps est compté, mais la plupart des hôpitaux ruraux de la Colombie-Britannique n'ont pas accès à un tomodensitomètre local. Nous enquêtons sur le nombre de transferts d’un hôpital rural de la Colombie-Britannique pour des tomodensitogrammes et nous décrivons les délais pour l’imagerie tomographique émergente. MéTHODES: Il s'agit d'une étude de cohorte prospective, sur une période d'un an, sur tous les patients nécessitant un transfert de l'hôpital de Golden and district, situé à 247 km du scanner le plus proche. Les formulaires de collecte de données ont été remplis de manière prospective et les principales mesures comprenaient l'âge, le niveau de triage de transport, la raison du transfert, l'hôpital de référence, le temps de demande de transfert et le temps de tomodensitométrie. L’intervalle de temps entre la demande de tomodensitométrie et l’imagerie par tomodensitométrie a été calculé et représente l’intervalle « retard au scanner». RéSULTATS: L’hôpital d’étude a reçu 8 672 visites aux services d’urgence (SU) et 220 ont été transférés aux centres d’aiguillage (2,5%). 61% de tous les transferts ont fait l'objet d'un scanner. Les transferts pour les urgences sensibles au facteur temps ont pris en moyenne 6 h 52. Les patients ayant subi un accident vasculaire cérébral aigu ont connu un intervalle de temps de 4 h 44. Des conditions moins urgentes et non urgentes ont entraîné un délai encore plus long. CONCLUSIONS: Cette étude met en évidence que l'absence de tomodensitomètre en milieu rural est associée à une augmentation des transferts et à des retards importants. L’amélioration de l’accès aux tomodensitomètres pour les communautés rurales peut être l’une des nombreuses étapes pour remédier aux disparités en matière de soins de santé entre les communautés rurales et urbaines.

ObjectivesEvaluate the relationship between naloxone dose (initial and cumulative) and opioid toxicity reversal and adverse events in undifferentiated and presumed fentanyl/ultra-potent opioid overdoses.MethodsWe searched Embase, MEDLINE, Cochrane Central Register of Controlled Trials, DARE, CINAHL, Science Citation Index, reference lists, toxicology websites, and conference proceedings (1972 to 2018). We included interventional, observational, and case studies/series reporting on naloxone dose and opioid toxicity reversal or adverse events in people >12 years old.ResultsA total of 174 studies (110 case reports/series, 57 observational, 7 interventional) with 26,660 subjects (median age 35 years; 74% male). Heterogeneity precluded meta-analysis. Where reported, we abstracted naloxone dose and proportion of patients with toxicity reversal. Among patients with presumed exposure to fentanyl/ultra-potent opioids, 56.9% (617/1,085) responded to an initial naloxone dose ≤0.4 mg compared with 80.2% (170/212) of heroin users, and 30.4% (7/23) responded to an initial naloxone dose >0.4 mg compared with 59.1% (1,434/2,428) of heroin users. Among patients who responded, median cumulative naloxone doses were higher for presumed fentanyl/ultra-potent opioids than heroin overdoses in North America, both before 2015 (fentanyl/ultra-potent opioids: 1.8 mg [interquartile interval {IQI}, 1.0, 4.0]; heroin: 0.8 mg [IQI, 0.4, 0.8]) and after 2015 (fentanyl/ultra-potent opioids: 3.4 mg [IQI, 3.0, 4.1]); heroin: 2 mg [IQI, 1.4, 2.0]). Where adverse events were reported, 11% (490/4,414) of subjects experienced withdrawal. Variable reporting, heterogeneity and poor-quality studies limit conclusions.ConclusionsPractitioners have used higher initial doses, and in some cases higher cumulative naloxone doses to reverse toxicity due to presumed fentanyl/ultra-potent opioid exposure compared with other opioids. High-quality comparative naloxone dosing studies assessing effectiveness and safety are needed.

ContextEpidemiological studies and animal research have suggested that air pollution may negatively impact the central nervous system (CNS). Controlled human exposure studies of the effect of air pollution on the brain have potential to enhance our understanding of this relationship and to inform potential biological mechanisms.ObjectivesBiomarkers of systemic and CNS inflammation may address whether air pollution exposure induces inflammation, with potential for CNS negative effects.Materials and methodsTwenty-seven healthy adults were exposed to two conditions: filtered air (FA) and diesel exhaust (DE) (300 μg PM2.5/m(3)) for 120 min, in a double-blinded crossover study with exposures separated by four weeks. Prior to and at 0, 3, and 24 h following each exposure, serum and plasma were collected and analyzed for inflammatory cytokines interleukin 6 (IL-6) and tumour necrosis factor alpha (TNF-α), the astrocytic protein S100b, the neuronal cytoplasmic enzyme neuron-specific enolase (NSE), and serum brain-derived neurotrophic factor (BDNF). We hypothesized that IL-6, TNF-α, S100b and NSE would increase, and BDNF would decrease, following DE exposure.ResultsAt no time-point following exposure to DE was a significant increase in concentration from baseline seen for IL-6, TNF-α, S100b, or NSE relative to FA exposure. Similarly, no significant decrease in BDNF concentration from baseline was seen following DE exposure, relative to FA. Furthermore, the repeated measures ANOVA considered for all time-points and biomarkers revealed no significant time-exposure interaction.Discussion and conclusionThese results suggest that short-term exposure to DE amongst healthy adults does not acutely affect the systemic or CNS biomarkers that we measured.

Background Exposure to traffic-related air pollution (TRAP) can adversely impact health but epidemiologic studies are limited in their abilities to assess long-term exposures and incorporate variability in indoor pollutant infiltration. Methods In order to examine settled house dust levels of hopanes, engine lubricating oil byproducts found in vehicle exhaust, as a novel TRAP exposure measure, dust samples were collected from 171 homes in five Canadian cities and analyzed by gas chromatography–mass spectrometry. To evaluate source contributions, the relative abundance of the highest concentration hopane monomer in house dust was compared to that in outdoor air. Geographic variables related to TRAP emissions and outdoor NO2 concentrations from city-specific TRAP land use regression (LUR) models were calculated at each georeferenced residence location and assessed as predictors of variability in dust hopanes. Results Hopanes relative abundance in house dust and ambient air were significantly correlated (Pearson’s r=0.48, p