Machine learning enabled detection of COVID-19 pneumonia using exhaled breath analysis: a proof-of-concept study.

Detection of the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) relies on real-time-reverse-transcriptase polymerase chain reaction (RT-PCR) on nasopharyngeal swabs. The false-negative rate of RT-PCR can be high when viral burden and infection is localized distally in the lower airways and lung parenchyma. An alternate safe, simple and accessible method for sampling the lower airways is needed to aid in the early and rapid diagnosis of COVID-19 pneumonia. In a prospective unblinded observational study, patients admitted with a positive RT-PCR and symptoms of SARS-CoV-2 infection were enrolled from three hospitals in Ontario, Canada. Healthy individuals or hospitalized patients with negative RT-PCR and without respiratory symptoms were enrolled into the control group. Breath samples were collected and analyzed by laser absorption spectroscopy (LAS) for volatile organic compounds (VOCs) and classified by machine learning (ML) approaches to identify unique LAS-spectra patterns (breathprints) for SARS-CoV-2. Of the 135 patients enrolled, 115 patients provided analyzable breath samples. Using LAS-breathprints to train ML classifier models resulted in an accuracy of 72.2%-81.7% in differentiating between SARS-CoV2 positive and negative groups. The performance was consistent across subgroups of different age, sex, body mass index, SARS-CoV-2 variants, time of disease onset and oxygen requirement. The overall performance was higher than compared to VOC-trained classifier model, which had an accuracy of 63%-74.7%. This study demonstrates that a ML-based breathprint model using LAS analysis of exhaled breath may be a valuable non-invasive method for studying the lower airways and detecting SARS-CoV-2 and other respiratory pathogens. The technology and the ML approach can be easily deployed in any setting with minimal training. This will greatly improve access and scalability to meet surge capacity; allow early and rapid detection to inform therapy; and offers great versatility in developing new classifier models quickly for future outbreaks.

Clinical characteristics and prognostic factors among hospitalized patients with substance use disorders: Findings from a retrospective cohort study of a Canadian inpatient addiction medicine service.

INTRODUCTION: Inpatient addiction medicine services (AMS) were developed in response to the growing needs of hospitalized individuals with substance use disorders (SUDs). AMS aim to enable timely initiation of pharmacologic treatment, build hospital capacity to support patients who use substances, and facilitate transition to community services. As an emerging service being adopted in hospitals across North America, the model of care, populations served, substance use trends, and clinical trajectory has not been widely described. This work aims to characterize patients accessing care through the AMS, establishing predictors for clinical trajectories in hospital including patient-initiated discharge (PID) and hospital re-admission. METHODS: Using a retrospective cohort design, we describe all patients seen by the AMS between 2018 and 2022 across four hospitals in Hamilton, Ontario. Patients seen by AMS were hospitalized and qualified for a SUD based on DSM-V criteria. The study used descriptive statistics to describe the cohort, where appropriate adjusted time-to-event survival models were constructed to identify predictors for hospital re-admission. RESULTS: Patients seen by the AMS (n = 695) frequently lacked access to primary care (47.0 %) and less than half (44.3 %) were receiving community addiction services on admission. The majority met criteria for opioid use disorder (OUD), with injecting being the primary consumption route (54.8 %). Patients exhibited high acuity, with 34.2 % requiring critical care measures. Provision of OAT substantially increased to 77.9 % of patients (29 % on admission). PID occurred in 17.8 % of patients and was significantly associated with an admitting diagnosis of suicidal ideation, infection, heart failure, and distinct substance use profiles including methamphetamine, fentanyl, and heroin use (p < 0.05). PID conferred a 66 % increased risk for re-admission (Hazard-Ratio: 1.66; 95 % CI: 1.08, 2.54; p = 0.02). CONCLUSION: Patients served by AMS primarily include individuals with OUD presenting with the associated medical complications and substantial deficits in the social determinants of health (e.g., high housing insecurity, poverty, and disability). PID occurs among 1 in 5 people and is associated with higher rates of re-admission. By identifying individuals at higher risk of adverse outcomes, these results provide an opportunity to improve outcomes in this high-risk, high-vulnerability population.

"They forgot about us": experiences of the COVID-19 pandemic among people deprived of housing in an urban centre in Ontario, Canada.

OBJECTIVES: People deprived of housing have been disproportionately affected by the COVID-19 pandemic and the public health mitigation measures implemented in response. Emerging evidence has shown the adverse health outcomes experienced by these communities due to SARS-CoV-2 infection; however, the voices of community members themselves have not been widely amplified in the published literature. METHODS: We conducted an interpretive qualitative study. People deprived of housing were involved in study development, recruitment, and data analysis. People deprived of housing or precariously housed were recruited during street outreach from June to July 2020. Participants completed one-on-one semi-structured interviews that were audio-recorded, transcribed, and analyzed thematically. RESULTS: Twenty-one participants were interviewed. Central to participants' experiences of the COVID-19 pandemic were descriptions of access to services, in terms of both changes in service availability and the reality of how accessible existing services were to the community, represented by the theme access. Four other themes were generated from our analysis and include feeling and being unheard, stripped of dignity, I've been broken, and strength and survival (with a subtheme, community care). CONCLUSION: Future emergency response efforts must meaningfully engage people deprived of housing in planning and decision-making in order to minimize adverse impacts of health emergencies and the associated public health responses. There needs to be more careful consideration of the unintended harmful impacts of public health measures implemented in response to pandemics.

RéSUMé: OBJECTIFS: Les personnes sans abri ont été démesurément affectées par la pandémie de COVID-19 et par les mesures sanitaires mises en œuvre en réponse à la pandémie. Des données probantes émergentes montrent les résultats sanitaires indésirables éprouvés par ces communautés en raison de l'infection par le SRAS-CoV-2, mais les voix des membres de ces communautés ne sont généralement pas amplifiées dans les articles publiés. MéTHODE: Nous avons mené une étude qualitative interprétative. Des personnes sans abri ont été mises à contribution dans l'élaboration de l'étude, le recrutement des participants et l'analyse des données. Des personnes sans abri ou au logement précaire ont été recrutées lors d'activités d'approche dans la rue en juin et juillet 2020. Elles se sont prêtées à des entretiens semi-directifs en tête à tête qui ont été enregistrés, transcrits, puis analysés par thèmes. RéSULTATS: Vingt et une personnes ont été interviewées. Leurs expériences de la pandémie de COVID-19 ont été fortement axées sur le thème de l'accès aux services, tant pour ce qui est des changements dans la disponibilité des services que de l'accessibilité réelle des services existants pour les membres de ces communautés. Quatre autres thèmes sont ressortis de notre analyse : le sentiment/le fait de ne pas être entendu, d'être dépouillé de sa dignité, d'avoir été brisé, et la force et la survie (et un thème secondaire : les soins de proximité). CONCLUSION: Les futurs efforts d'intervention d'urgence doivent inclure une véritable collaboration avec les personnes sans abri dans la planification et la prise de décisions afin de réduire les répercussions néfastes des urgences sanitaires et des mesures de santé publique connexes. Il faut examiner plus attentivement les effets pervers des mesures sanitaires mises en œuvre en réponse aux pandémies.

'It's so simple' Lessons from the margins: a qualitative study of patient experiences of a mobile health clinic in Hamilton, Ontario, Canada.

OBJECTIVE: Our study explored the experiences of clients of HAMSMaRT (Hamilton Social Medicine Response Team), a mobile health service, in the context of their experiences of the overall healthcare system. DESIGN: We conducted a qualitative study with reflexive thematic analysis. SETTING: HAMSMaRT is a mobile health service in Hamilton, Ontario Canada providing primary care, internal and addiction medicine and infectious diseases services. PARTICIPANTS: Eligible participants were clients of HAMSMaRT who could understand English to do the interview and at least 16 years of age. Fourteen clients of HAMSMaRT were interviewed. RESULTS: Our findings represented five themes. When the themes of people deserve care, from the margins to the centre, and improved and different access to the system are enacted, the model of care works, represented by the theme it works!. The way in which participants compared their experiences of HAMSMaRT to the mainstream healthcare system insinuated how simple it is, represented by the theme it's so simple. CONCLUSIONS: Our findings offer guidance to the broader healthcare system for walking from the rhetoric to practice of person-centred care.

"They're causing more harm than good": a qualitative study exploring racism in harm reduction through the experiences of racialized people who use drugs.

BACKGROUND: Increased opioid-related morbidity and mortality in racialized communities has highlighted the intersectional nature of the drug policy crisis. Given the racist evolution of the war on drugs and the harm reduction (HR) movement, the aim of this study is to explore racism within harm reduction services through the perspectives of our participants. METHODS: We conducted a qualitative descriptive study to explore the perspectives of racialized service users and providers on racism in the HR movement in the Greater Toronto and Hamilton Area (GTHA). Four racialized service users and four racialized service providers participated in semi-structured interviews that were audio-recorded, transcribed, and analysed thematically. RESULTS: Five themes related to racism in HR were generated: (1) whiteness of harm reduction as a barrier to accessing services, (2) diversifying HR workers as a step towards overcoming distrust, (3) drop-in spaces specific to Black, Indigenous, and people of colour are facilitators to accessing harm reduction, (4) lack of representation in HR-related promotional and educational campaigns, and (5) HR as a frontier for policing. CONCLUSIONS: Our findings suggest that structural and institutional racism are prevalent in HR services within the GTHA, in the form of colour-blind policies and practices that fail to address the intersectional nature of the drug policy crisis. There is a need for local HR organizations to critically reflect and act on their practices and policies, working with communities to become more equitable, inclusive, and accessible spaces for all people who use drugs.

Infectious diseases, comorbidities and outcomes in hospitalized people who inject drugs (PWID) infections in persons who inject drugs.

Injection drug use poses a public health challenge. Clinical experience indicates that people who inject drugs (PWID) are hospitalized frequently for infectious diseases, but little is known about outcomes when admitted. Charts were identified from local hospitals between 2013-2018 using consultation lists and hospital record searches. Included individuals injected drugs in the past six months and presented with infection. Charts were accessed using the hospital information system, undergoing primary and secondary reviews using Research Electronic Data Capture (REDCap). The Wilcoxon rank-sum test was used for comparisons between outcome categories. Categorical data were summarized as count and frequency, and compared using Fisher's exact test. Of 240 individuals, 33% were admitted to the intensive care unit, 36% underwent surgery, 12% left against medical advice (AMA), and 9% died. Infectious diagnoses included bacteremia (31%), abscess (29%), endocarditis (29%), cellulitis (20%), sepsis (10%), osteomyelitis (9%), septic arthritis (8%), pneumonia (7%), discitis (2%), meningitis/encephalitis (2%), or other (7%). Sixty-six percent had stable housing and 60% had a family physician. Fifty-four percent of patient-initiated discharges were seen in the emergency department within 30 days and 29% were readmitted. PWID are at risk for infections. Understanding their healthcare trajectory is essential to improve their care.

Sex-Specific Risk Factors and Health Disparity Among Hepatitis C Positive Patients Receiving Pharmacotherapy for Opioid Use Disorder: Findings From a Propensity Matched Analysis.

BACKGROUND: The incidence of opioid-related fatality has reached unparalleled levels across North America. Patients with comorbid hepatitis C virus (HCV) remain the most vulnerable and difficult to treat. Considering the unique challenges associated with this population, we aimed to re-examine the impact of HCV on response to medication assistant treatment for opioid use disorder and establish sex-specific risk factors affecting care. METHODS: This study employs a multi-center prospective cohort design, with 1-year follow-up. Patients aged ≥18, receiving methadone for opioid use disorder were recruited from a network of outpatient opioid addiction treatment centers across Southern Ontario, Canada. Patients with ≥50% positive opioid urine screens over 1 year of follow-up were classified as poor responders. The prognostic impact of HCV on response was established using a propensity score matched analysis. Sex-specific regression models were constructed to evaluate risk factors for treatment response. RESULTS: Among participants eligible for inclusion (n = 1234), HCV was prevalent in 25% (n = 307). HCV patients exhibited significantly higher rates of high-risk opioid consumption patterns 35.29% (standard deviation 0.478). Sex-specific examination revealed females with HCV incur a 2 times increased risk for high-risk opioid consumption behaviors (female odds ratio: 1.95, 95% confidence interval 1.23, 3.10; P = 0.01). CONCLUSIONS: Findings from this study establish the link between HCV and poor treatment response, with differentially higher risk among female patients. In light of the high potential for overdose among this population, concerted efforts are required for distinguishing the source for sex-based disparities, in addition to establishing trauma and gender informed treatment protocols.

The Second Heart Program-A multidisciplinary team supporting people who inject drugs with infective endocarditis: Protocol of a feasibility study.

INTRODUCTION: Infective endocarditis (IE) is a severe and highly prevalent infection among people who inject drugs (PWID). While short-term (30-day) outcomes are similar between PWID and non-PWID, the long-term outcomes among PWID after IE are poor, with 1-year mortality rates in excess of 25%. Novel clinical interventions are needed to address the unique needs of PWID with IE, including increasing access to substance use treatment and addressing structural barriers and social determinants of health. METHODS AND ANALYSIS: PWID with IE will be connected to a multidisciplinary team that will transition with them from hospital to the community. The six components of the Second Heart Team are: (1) peer support worker with lived experience, (2) systems navigator, (3) addiction medicine physician, (4) primary care physician, (5) infectious diseases specialist, (6) cardiovascular surgeon. A convergent mixed-methods study design will be used to test the feasibility of this intervention. We will concurrently collect quantitative and qualitative data and 'mix' at the interpretation stage of the study to answer our research questions. ETHICS AND DISSEMINATION: This study has been approved by the Hamilton Integrated Research Ethics Board (Project No. 7012). Results will be presented at national and international conferences and submitted for publication in a scientific journal. CLINICAL TRAIL REGISTRARION: Trial registration number: ISRCTN14968657 https://www.isrctn.com/ISRCTN14968657.

Hospital policy as a harm reduction intervention for people who use drugs.

Hospitals are a critical touchpoint for people who use drugs (PWUD). However, hospital policies, both formal and informal, can have a detrimental impact on PWUD in acute care settings. Introducing new policies, or revising existing policies that inadvertently harm or stigmatize PWUD while hospitalized, could be an effective harm reduction intervention for this high-risk population. This paper explores seven areas where institutional policy change could improve the hospital experience of PWUD: (1) use of nonprescribed substances in hospital, (2) supporting inpatient addiction consultation services (3) in-hospital supervised consumption spaces (4) supply and distribution of safe drug use equipment and naloxone, (5) role of security services and personal searches, (6) use of hospital restrictions, and (7) involvement of PWUD in policy development.

Peer support workers as a bridge: a qualitative study exploring the role of peer support workers in the care of people who use drugs during and after hospitalization.

BACKGROUND: To describe the key qualities and unique roles of peer support workers in the care of people who inject drugs during and after hospitalization. METHODS: We conducted a qualitative study. Key stakeholders were recruited including: people who use drugs who had been hospitalized, healthcare team members, peer support workers, and employers of peer support workers. Data were collected from 2019 to 2020 using semi-structured interviews that were audio-recorded, transcribed, and analyzed thematically. RESULTS: Fourteen participants were interviewed: 6 people who use drugs who had been hospitalized, 5 healthcare team members, 2 peer support workers, and 1 employer of peer support workers. At the core of the data was the notion of peer workers acting as a bridge. We found four themes that related to functions of this bridge: overcoming system barriers, advocacy, navigating transitions within the healthcare system, and restoring trust between HCPs and PWUD. We found two themes for building a strong bridge and making the role of a peer support worker function effectively (training and mentorship, and establishing boundaries). We found three themes involving characteristics of an effective peer worker (intrinsic qualities, contributions of shared experiences, and personal stability). CONCLUSION: Peer support workers are highly valued by both people who use drugs and members of the healthcare team. Peer support workers act as a bridge between patients and healthcare providers and are critical in establishing trust, easing transitions in care, and providing unique supports to people who use drugs during and after hospitalization.

"When you first walk out the gates where do [you] go?": Barriers and opportunities to achieving continuity of health care at the time of release from a provincial jail in Ontario.

We aimed to explore continuity of health care and health barriers, facilitators, and opportunities for people at the time of release from a provincial correctional facility in Ontario, Canada. We conducted focus groups in community-based organizations in a city in Ontario, Canada: a men's homeless shelter, a mental health service organization, and a social service agency with programs for people with substance use disorders. We included adults who spoke English well enough to participate in the discussion and who had been released from the provincial correctional facility in the previous year. We conducted three focus groups with 18 total participants. Participants had complex health needs on release, including ongoing physical and psychological impacts of time in custody. They identified lack of access to high quality health care; lack of housing, employment, social services, and social supports; and discrimination on the basis of incarceration history as barriers to health on release. Access to health care, housing, social services, and social supports all facilitated health on release. To address health needs on release, participants suggested providing health information in jail, improving discharge planning, and developing accessible clinics in the community. This pilot study identified opportunities to support health at the time of release from jail, including delivery of programs in jail, linkage with and development of programs in the community, and efforts to support structural changes to prevent and address discrimination. These data will inform ongoing work to support health and continuity of care on release from a provincial correctional facility.

The effectiveness of substance use interventions for homeless and vulnerably housed persons: A systematic review of systematic reviews on supervised consumption facilities, managed alcohol programs, and pharmacological agents for opioid use disorder.

BACKGROUND: Substance use is disproportionately high among people who are homeless or vulnerably housed. We performed a systematic overview of reviews examining the effects of selected harm reduction and pharmacological interventions on the health and social well-being of people who use substances, with a focus on homeless populations. METHODS AND FINDINGS: We searched MEDLINE, EMBASE, PsycINFO, Joanna Briggs Institute EBP, Cochrane Database of Systematic Reviews and DARE for systematic reviews from inception to August 2019. We conducted a grey literature search and hand searched reference lists. We selected reviews that synthesized evidence on supervised consumption facilities, managed alcohol programs and pharmacological interventions for opioid use disorders. We abstracted data specific to homeless or vulnerably housed populations. We assessed certainty of the evidence using the GRADE approach. Our search identified 483 citations and 30 systematic reviews met all inclusion criteria, capturing the results from 442 primary studies. This included three reviews on supervised consumption facilities, 24 on pharmacological interventions, and three on managed alcohol programs. Supervised consumption facilities decreased lethal overdoses and other high risk behaviours without any significant harm, and improved access to care. Pharmaceutical interventions reduced mortality, morbidity, and substance use, but the impact on retention in treatment, mental illness and access to care was variable. Managed alcohol programs reduced or stabilized alcohol consumption. Few studies on managed alcohol programs reported deaths. CONCLUSIONS: Substance use is a common chronic condition impacting homeless populations. Supervised consumption facilities reduce overdose and improve access to care, while pharmacological interventions may play a role in reducing harms and addressing other morbidity. High quality evidence on managed alcohol programs is limited.

Thirty-day readmission after medical-surgical hospitalization for people who experience imprisonment in Ontario, Canada: A retrospective cohort study.

We aimed to compare 30-day readmission after medical-surgical hospitalization for people who experience imprisonment and matched people in the general population in Ontario, Canada. We used linked population-based correctional and health administrative data. Of people released from Ontario prisons in 2010, we identified those with at least one medical or surgical hospitalization between 2005 and 2015 while they were in prison or within 6 months after release. For those with multiple eligible hospitalizations, we randomly selected one hospitalization. We stratified people by whether they were in prison or recently released from prison at the time of hospital discharge. We matched each person with a person in the general population based on age, sex, hospitalization case mix group, and hospital discharge year. Our primary outcome was 30-day hospital readmission. We included 262 hospitalizations for people in prison and 1,268 hospitalizations for people recently released from prison. Readmission rates were 7.7% (95%CI 4.4-10.9) for people in prison and 6.9% (95%CI 5.5-8.3) for people recently released from prison. Compared with matched people in the general population, the unadjusted HR was 0.72 (95%CI 0.41-1.27) for people in prison and 0.78 (95%CI 0.60-1.02) for people recently released from prison. Adjusted for baseline morbidity and social status, hospitalization characteristics, and post-discharge health care use, the HR for 30-day readmission was 0.74 (95%CI 0.40-1.37) for people in prison and 0.48 (95%CI 0.36-0.63) for people recently released from prison. In conclusion, people recently released from prison had relatively low rates of readmission. Research is needed to elucidate reasons for lower readmission to ensure care quality and access.

"They Will Come to Understand": Supervisor Reflections on International Medical Electives.

Phenomenon: Increasing numbers of medical students from high-income countries are undertaking international medical electives (IMEs) during their training. Much has been written about the benefits of these experiences for the student, and concerns have been raised regarding the burden of IMEs on host communities. The voices of physicians from low- and middle-income countries who supervise IMEs have not been explored in depth. The current study sought to investigate host-physician perspectives on IMEs. Approach: Host supervisors were recruited by convenience sampling through students travelling abroad for IMEs during the summer of 2012. From 2012 through 2014, 11 semistructured interviews were conducted by telephone with host supervisors from Nepal, Uganda, Ghana, Guyana, and Kenya. Participants were invited to describe their motivations for hosting IMEs and their experiences of the benefits and harms of IMEs. Interviews were transcribed verbatim and checked for accuracy. An initial coding framework was developed and underwent multiple revisions, after which analytic categories were derived using conventional qualitative content analysis. Findings: For host supervisors, visits from international medical students provided a window into the resource-rich medical practice of high-income countries, and supervisors positioned themselves, their education, and clinical expertise against perceived standards of the international students' context. Hosting IMEs also contributed to supervisors' identities as educators connected to a global community. Supervisors described the challenge of helping students navigate their distress when confronting global health inequity. Finally, the desire for increasingly reciprocal relationships was expressed as a hope for the future. Insights: IMEs can be formative for host supervisors' identities and are used to benchmark host institutions compared with international medical standards. Reciprocity was articulated as essential for IMEs moving forward.

Flow cytometric analysis of FSHR, BMRR1B, LHR and apoptosis in granulosa cells and ovulation rate in merino sheep.

The aim of the present study was to determine the direct cause of the mutation-induced, increased ovulation rate in Booroola Merino (BB) sheep. Granulosa cells were removed from antral follicles before ovulation and post-ovulation from BB (n=5) and WT (n=12) Merino ewes. Direct immunofluorescence measurement of mature cell surface receptors using flow cytometry demonstrated a significant up-regulation of FSH receptor (FSHR), transforming growth factor beta type 1, bone morphogenetic protein receptor (BMPR1B), and LH receptor (LHR) in BB sheep. The increased density of FSHR and LHR provide novel evidence of a mechanism for increasing the number of follicles that are recruited during dominant follicle selection. The compounding increase in receptors with increasing follicle size maintained the multiple follicles and reduced the apoptosis, which contributed to a high ovulation rate in BB sheep. In addition, we report a mutation-independent mechanism of down-regulation to reduce receptor density of the leading dominant follicle in sheep. The suppression of receptor density coincides with the cessation of mitogenic growth and steroidogenic differentiation as part of the luteinization of the follicle. The BB mutation-induced attenuation of BMPR1B signaling led to an increased density of the FSHR and LHR and a concurrent reduction in apoptosis to increase the ovulation rate. The role of BMPs in receptor modulation is implicated in the development of multiple ovulations.

Reducing stigma in healthcare and law enforcement: a novel approach to service provision for street level sex workers.

INTRODUCTION: Providing services for street level sex workers requires a multidisciplinary approach, addressing both health and safety concerns typical of their age and gender and those that arise specific to their line of work. Despite being a diverse population, studies have identified some specific health needs for sex workers including addictions treatment, mental health. Additionally, studies have shown a higher risk of physical and sexual assault for this population. The Persons at Risk program (PAR) in London, Ontario, Canada was started in 2005 to address the specific needs of street level sex workers by using a harm-reduction model for policing and healthcare provision. This qualitative study evaluated this model of care in terms of improving access to healthcare and essential police services for street level sex workers. METHODS: A total of 14 semi-structured interviews were conducted with current and former female street level sex workers enrolled in the PAR program. In addition, 3 semi-structured interviews were conducted with health and law enforcement professionals. The research team then analyzed and coded the transcripts using qualitative description to identify key themes in the data. RESULTS: Results indicated that participants represent a vulnerable population with increased safety concerns and healthcare needs relating to addictions, mental health and infectious disease. Despite this, participants reported avoiding healthcare workers and police officers in the past because of fear of stigma or repercussions. All participants identified the harm reduction approach of the PAR program as being essential to their continued engagement with the program. Other important aspects included flexible hours, the location of the clinic, streamlined access to mental health and addictions treatment and the female gender of the police and healthcare worker. CONCLUSIONS: The PAR program provides sex workers access to much needed primary healthcare that is flexible and without judgment. In addition, they are provided with a direct avenue to access law enforcement. We feel a similar model of care could be applicable to many cities across Canada.

Toward reciprocity: host supervisor perspectives on international medical electives.

CONTEXT: An increasing number of medical students are engaging in international medical electives, the majority of which involve travel from northern, higher-income countries to southern, lower-income countries. Existing research has identified benefits to students participating in these experiences. However, reports on the impacts on host communities are largely absent from the literature. OBJECTIVES: The current study aims to identify host country perspectives on international medical electives. METHODS: Questionnaires were delivered to a convenience sample of supervisors hosting international elective students (n = 39) from a Canadian medical school. Responses represented 22 countries. Conventional content analysis of the qualitative data was used to identify themes in host supervisor perspectives on the impact of international medical electives. RESULTS: Host country supervisors identified that in addition to the benefits realised by the elective students, supervisors and their institutions also benefited from hosting Canadian students. Although some host supervisors denied the occurrence of any harm, others expressed concern that international elective students may negatively impact the local community in terms of resource use and patient care. Host country supervisors also identified potential harms to travelling students including health risks and emotional distress. Ideas for improving international electives were identified and were largely centred around increasing the bidirectional flow of students by establishing formal partnerships between institutions. CONCLUSIONS: This research provides important insights into the impacts of international medical student electives from the perspective of host country supervisors. This research may be a starting point for further research and the establishment of meaningful partnerships that incorporate the self-identified needs of receiving institutions, especially those in lower-income settings.

Insulinotrophic and insulin-like effects of a high molecular weight aqueous extract of Pterocarpus marsupium Roxb. hardwood.

ETHNOPHARMACOLOGICAL RELEVANCE: Pterocarpus marsupium Roxb. (PM) is an Ayurvedic traditional medicine well known for its antidiabetic potential. AIM: To fractionate the antidiabetic constituent(s) of the aqueous of extract of PM hardwood (PME). MATERIALS AND METHODS: Bio-assay methods including, insulin secretion from mouse pancreas and glucose uptake by mouse skeletal muscle, were used to determine and fractionate the antidiabetic activity of PME. Results obtained from the in vitro experiments were then verified by examining the effect of PME on glucose clearance in normoglycemic, non-diabetic sheep in vivo. RESULTS: Exposure of mouse pancreatic and muscle tissues to PME stimulated the insulin secretion and glucose uptake, respectively, in a concentration-dependent manner. PME-mediated muscle glucose uptake was not potentiated in the presence of insulin indicating that PME acts via pathways which are utilized by insulin. Bio-assay-guided fractionation of PME yielded a high molecular weight fraction which had potent antidiabetic properties in vitro, and in in vivo. CONCLUSIONS: Our findings, we believe for the first time, provide novel insights for the antidiabetic constituents of PM and demonstrate that a high molecular weight constituent(s) of PM has potent insulinotrophic and insulin-like properties.