Journal Clubs

The IDC/CfE Journal Club is a critical review and discussion of recent scientific articles around HIV/AIDS-related topics. The IDC Journal Club takes place every 4 weeks on a Thursday 8-9AM in the BC-CfE Conference Room. The CfE Journal Club takes place every 4 weeks on a Thursday 12-1PM in the BC-CfE Conference Room.

Click on the + sign to see a summary of the article.

IDC Journal Club – Thursday, May 1, 2014

Andre Cahill presented the paper “Change in mental health after smoking cessation: systematic review and meta-analysis” by Taylor et al. in BMJ (2014). The authors examine the association between smoking and mental health, particularly the assumption held by some smokers that smoking helps to alleviate depression and anxiety. The authors conducted a systematic review and meta-analysis of observational data to compare mental health status among people who stop smoking and people who continue to smoke.

Study Design:
Eligibility criteria: studies of smokers that reported data on those who continued and those who quit smoking, studies that measured mental health before and after quitting, and only longitudinal studies (RCTs and cohort studies). 26 studies were included in the meta-analysis (11 cohort studies, 14 secondary analyses and 1 randomized trial).

Interpretations:
Smoking cessation causes improvement in mental health and improving mental health causes cessation. Chronic tobacco smoking is associated with neuroadaptations in nicotinic pathways in the brain, which are in turn associated with depressed mood, agitation and anxiety shortly after smoking.

Critique and Discussion:
There may be a negative bias in the literature, i.e. less likely to publish negative results. There are limitations of self-reporting. Smoking cessation is an achievement that can have positive effect in itself. Article’s conclusion that the effects of smoking cessation matches those of antidepressants need to be clarified. The article challenges the notion that smoking helps with mood, anxiety, etc.

IDC Journal Club – Thursday May 29, 2014

Dr. Mark Gilbert (BCCDC) presented his paper “Targeting screening and social marketing to increase detection of acute HIV infection in men who have sex with men in Vancouver, British Columbia” in AIDS (2013). The paper is based on a study that examines the impact of targeted nucleic acid amplification testing (NAAT) on identifying acute HIV infection (AHI). Pooled NAAT, introduced in BC in April 2009, can detect HIV infection within 7-15 days of infection. The study examined targeted implementation of pooled NAAT for MSM, who comprise the majority of new infections (58% in BC in 2011).

Study Design:
Pooled NAAT was implemented at a total of 6 clinics. Eligibility: Participants over 18 years of age who self-identify as men. Definition of AHI: detection of HIV RNA/DNA by NAAT or detection of p24 antigen. The study compared HIV diagnoses rates 36 months before and after the introduction of pooled NAAT in April 2009. Social marketing campaigns (posters, urinal ads, email blasts, etc.) were implemented by a community gay men’s organization to raise awareness about rapid testing, NAAT and AHI.

Findings:
The rate of AHI diagnosis increased during the post-implementation period (1.03 to 1.84 per 1000 men tested, p=0.003). Of 217 new diagnoses after implementation of pooled NAAT, about 25% were AHIs.

Conclusions:
Targeted pooled NAAT combined with social marketing is effective in detecting AHI detection among MSM compared to third generation enzyme immunoassay (EIA) testing.

IDC Journal Club – Thursday June 12, 2014

Guillaume Colley presented his paper “The cascade of HIV care in British Columbia, Canada, 1996-2011: a population-based retrospective cohort study” in The Lancet (2014). The paper is based on a longitudinal population-based study of the numbers and proportions of individuals in each of the eight stages of the cascade of HIV care in BC from 1996-2011 (infected with HIV, diagnosed, linked to HIV care, retained in HIV care, need to be on HAART, on HAART, adherent to HAART and virologically suppressed).

Study Design:
The total number of HIV-positive individuals (diagnosed and undiagnosed) was drawn from Public Health Agency of Canada’s estimates. HIV-positive individuals in BC were categorized along the cascade using the data from: BCCDC for HIV testing (nominal); BC-CfE for plasma viral load (pVL), CD4 and antiretroviral (ARV) uptake; and Ministry of Health (MoH) for MSP billing and PharmaNet data for non-ARV drug dispensing. The number in each stage was calculated as a proportion of the number in the previous stage, not the total number of individuals, e.g. “virologically suppressed” are those people who are HAART adherent who have viral suppression and does not include those who have viral suppression without HAART adherence. “On HAART” was defined as at least 2 dispensation at least 3 months apart.

Findings:
The proportion of individuals who are HIV-positive but undiagnosed fell from 49% to 29%. People who are on HAART but not adherent decreased from 24% to 13.4%. The greatest improvement: People who are adherent but not virologically suppressed decreased from 95.2% 21.6%. Meanwhile, people linked to care but not retained in care remained steady at around 20%.

Conclusions:
The results of this analysis can help inform targeted healthcare interventions. More effort is needed in engaging HIV-positive individuals to remain in care and access HAART. Further HIV testing is also important but there is some uncertainty because the total number of HIV-positive individuals is an estimate. The study was limited by this estimation also by the number of HIV-positive individuals who are lost to care, who emigrate from the province, who access clinics billed by session (not captured by MoH) and who access treatment from clinical trials (not captured by BC-CfE). The BCCfE produces quarterly reports on the cascade of HIV care in BC, broken down further into health authorities and demographics. A cascade of HIV care analysis at the IDC between 2005-2013 showed that the number of linked patients increased threefold and virologically suppressed increased from 42% to 70%. This change is likely due to program changes (e.g. Peer Navigation, case management) and new treatment guidelines. The proportion of those who are on HAART but not HAART adherent remained constant at about 6%.

IDC Journal Club – Thursday September 11, 2014

Tara Andrusiak (PGY2 from University of Ottawa) presented the paper “Tuberculosis screening and active tuberculosis among HIV-infected persons in a Canadian tertiary care centre” by Brassard et al. in Canadian Journal of Infectious Diseases & Medical Microbiology (2009). HIV infection increases the risk of reactivation of latent tuberculosis (TB). The study evaluates how latent TB is detected and treated to determine the effectiveness of screening in HIV-infected patients with diverse risk profiles.

Study Design:
A retrospective medical record database review (1988 to 2007) was conducted at a tertiary care HIV clinic. The proportion of patients receiving tuberculin skin tests (TST) and the rate of active TB at each stage of screening and prevention were estimated. Predictors of receiving a TST at baseline, testing positive by TST and developing active TB were evaluated.

Findings:
2123 patients were observed. 22.4% were tested by TST within 90 days of clinic visit, as per guidelines. Independent predictors of receiving a TST at baseline were: having a first clinic visit during the HAART era, country of birth, time between HIV diagnosis and first visit and previous ARV exposure. Of the 17 patients who developed active TB during follow-up, 9 had no documented TSTs at baseline or during follow-up. 41% of all TB patients and 56% of TB patients who were not screened were born in Canada.

Interpretations:
Administration of TSTs to newly diagnosed HIV patients was inconsistent and differential according to country of birth, among other factors, resulting in missed opportunities for TB prevention. For instance, at this clinic patients from TB endemic regions (i.e. Africa, Asia, Haiti and Latin America and the Caribbean) were more likely to be screened than Canadian-born patients.

IDC Journal Club – Thursday October 30, 2014

Basia Hamata (Family Practice resident from Prince George) presented the paper “Is bone loss linked to chronic inflammation in antiretroviral-naïve HIV-infected adults? A 48-week matched cohort study” by Hileman et al. in AIDS (2014). The goal of the study was to evaluate changes in bone mineral density (BMD) without the confounding effects of ART. The authors hypothesized that HIV-positive ART-naïve adults would have a greater loss of BMD at hip and spine compared to HIV-uninfected adults.

Study Design:
A prospective matched cohort study over a 48-week period was conducted on HIV-positive, ART-naïve adults and HIV-negative control group matched by age, sex and race to determine the effect of HIV, systemic inflammation and vitamin D concentration on BMD over time. Inclusion criteria: HIV-positive individuals ≥ 18 years of age and ART-naïve and unlikely to require ART for at least 48 weeks (based on treatment guidelines at the time which recommended ART initiation at CD4 cell count ≤350 cells/μL). Exclusion criteria: Diabetes mellitus, active infectious or inflammatory condition, pregnancy or breastfeeding. HIV-positive participants were recruited from an immunology clinic in Cleveland, Ohio. 48-week period was chosen because the average time to ART initiation at the time the study was conducted was 2 years at the clinic. This period would also permit 2 DXA readings prior to ART initiation. For BMD measurement, Hologic scanner was used, performed at a single site. Technologists were blinded to the HIV status of participants. Blood was drawn after 12 hours fasting at entry and at week 48.

Findings:
Data was collected between July 2010 and August 2012. 88 participants enrolled in the study (47 were HIV-positive). 11 did not complete the study. Median baseline and nadir CD4 counts were 625 (533-844) and 520 (452-618) cells/μL. HIV-1 RNA was 4638 (783-20,600) copies/mL and known duration of HIV infection was 4 (1.1-12.4) years. At baseline, the following were similar in the HIV-positive group and the HIV-negative control group: proportion of vitamin D insufficiency and deficiency, and BMD at total hip, femoral, neck, trochanter and spine. Baseline IL-6, STNFR-11, sVCAM-1 and sICAM-1 were higher in the HIV-positive group. Over the 48-week period, in the HIV-positive group, BMD at total hip and trochanter decreased. In the control group, BMD did not significantly change. However, changes in BMD did not reach statistical significance between groups. Site-specific comparison showed that HIV-infected group was 2.8 times more likely than control group to have bone loss at trochanter site. This risk persisted after adjustment for age, sex, race BMI, smoking and HCV. The effect of each inflammatory marker on the odds ratio for HIV status in a logistic regression model of bone loss showed that HIV status was not independently predictive of bone loss at trochanter site. 20.5% of HIV-positive participants progressed from normal bone to osteopenia or from osteopenia to osteoporosis, compared to 5.6% in the control group (p=0.089).

Conclusions:
HIV-positive, ART-naïve adults had BMD loss at total hip and trochanter sites, although change in BMD did not reach statistical significance between groups. HIV-positive adults are more likely to have bone loss at trochanter site and this may be related to heightened inflammation.

Discussion:
Strengths of the article: Studying ART-naïve patient population allowed an opportunity to study the effect of HIV without the confounding effect of ART. This type of study may not be repeatable with the current guidelines. Weaknesses of the article: Small sample and short. A large difference in BMD changes between the groups was not observed. Implications for clinical practice: Preventive measures should be taken in all patients, e.g., weight-bearing exercises, decrease smoking and alcohol intake, adequate vitamin D and calcium.

IDC Journal Club – Thursday June 25, 2015

Nathaniel Winata presented the paper “Use of Human Papillomavirus Vaccine in HIV-infected Men for the Prevention of Anal Dysplasia and Cancer” by Cachay & Mathews in AIDS Reviews (2014). The authors conducted a review to see if data suggests if the HPV vaccine should be given to HIV infected men who have sex with men (MSM) to decrease the rates anal cancer in this population. The authors discussed the efficacy of HPV vaccines to prevent anogenital warts/anal dysplasia and the key issues associated with HPV vaccination in HIV positive men.

Findings:
The studies reviewed showed that the HIV positive MSM population have shown to have a three-fold increased risk of HPV infection in comparison to HIV negative MSM population.

The two vaccines that are currently out are the quadrivalent vaccine (Gardisil) and bivalent vaccine (Cervarix) which both protect against HPV 16 and 18 and the quadrivalent vaccine additionally protects HPV 6 and 11. There are no differences between bi and quad vaccines in safety and immunogenicity in HIV positive men. Clinical trials have shown the HPV vaccine as safe and induce robust response of HPV neutralizing antibodies among HIV positive patients. However, more research needs to be done on the long-term impact of HPV neutralizing antibody decay and other protective vaccine cell-mediated effects in the mucosal compartment

One clinical trial noted that the efficacy of HIV negative men who received the HPV vaccine prior to being exposed to HPV reduced external genital lesions by 90.4% while those who had been exposed to HPV prior to the HPV vaccine had a efficacy of 60.2% for any HPV-related lesion but an increased 65.5% for lesions related to HPV types 6, 11, 16 and 18.

Another study on HIV negative MSM 16-26 years of age were given the quad vaccine which prevented 50.3% of anal dysplasia types 6, 11, 16 and 18 in those who were exposed to the HPV infection before becoming vaccinated while 77.5% of anal dysplasia was prevented in those who had no prior exposure to HPV.

Canada’s National Advisory Committee of Immunization (NACI) recommends that boys and men between ages 9-26 be given quadrivalent HPV vaccine. The quadrivalent HPV vaccine for boys and men is not publicly funded in British Columbia. MSM do not benefit from herd immunity provided by vaccinating girls and women.

IDC Journal Club – Thursday October 1, 2015

Nadia Fairbairn (PGY5 Internal Medicine) presented the paper “Opioid overdose rates and implementation of overdose education and nasal naloxone distribution in Massachusetts: interrupted time series analysis” by Walley et al. in BMJ (2013). The authors evaluated the impact of a state supported education and nasal naloxone distribution (OEND) program on rates of opioid overdose related death and acute care utilization in the state of Massachusetts.

Study Design:
Interrupted time series analysis of opioid related overdose death and acute care utilization rates from 2002 to 2009 comparing community-year strata with high and low rates of OEND implementation to those with no implementation.

Findings:
The OEND program trained 2912 bystanders who reported 327 opioid overdose rescues. Both community-year strata with 1-100 enrollments per 100,000 population and community-year strata with greater than 100 enrollments per 100,000 population had significantly reduced adjusted rate ratios compared with communities with no implementation. Differences in rates of acute care hospital utilization were not significant.

Conclusion:
The study concluded that communities where OEND was implemented had a reduced death rate from opioid overdose death rates. Evidence shows that by training potential bystanders to prevent, recognize, and respond to opioid overdoses, OEND is an effective intervention.

Discussion:
Clearly the use of naloxone in the appropriate context has significant survival benefits. Health Canada has not yet approved nasal naloxone. Intramuscular (IM) naloxone kits are approved and are available for free at the IDC. No prescription is needed from a physician. IDC nurses are trained to supply the naloxone kits and to provide education on drug overdose. Furthermore, these interactions are good opportunities for talking with patients about harm reduction and education on drug use. Training for using IM naloxone is provided weekly in the St. Paul’s Hospital dining room.

IDC Journal Club – Thursday November 26, 2015

Ryan Herriot (R3 Enhanced Skills HIV, UBC Family Practice) discussed the report “Culture, Context and the Mental Health and Psychosocial Wellbeing of Syrians” by the United Nations High Commissioner for Refugees. The paper discusses the mental health concerns of Syrian refugees. There is a wide range of emotional, cognitive, physical, and behavioural and social challenges Syrians refugees face.

Canada’s refugee system
There are two main categories of resettled refugees:

  1. Government-Assisted Refugees (GARs): The federal government funds a network of settlement agencies to provide assistance to GARs and provides income support for up to 12 months.
  2. Privately Sponsored Refugees (PSRs): Are supported by private sponsors that include income support and practical assistance for the first year.

The incoming group of refugees from Syria will be a mixture of both groups. A key difference between Canada and Germany is that we have existing refugee resettlement services so we are comparatively well-positioned to successfully integrate and care for Syrian refugees. The HIV-positive refugees who arrive in the lower mainland will receive their primary care from Bridge Clinic for the first year. The greatest challenge will be transitioning patients to other clinics following the first year.

Anticipated Syrian health concerns
Syrian refugees are expected to have a low burden of infectious diseases as Syria had a robust public vaccination program. However, vaccinations coverage in Syria has dropped from 90% in 2010 to 52% in 2014. The majority of refugees are expected to be experiencing symptoms of distress. Although many refugees have been through major traumas, evidence indicates that how well they are supported in their new lives after resettling is by far the bigger driver of mental health. The refugees are likely to describe their mental health symptoms as a combination of physical and psychological symptoms. Two co-existing cultural phenomena that contribute to this apparent somatization are:

  • An understanding of illness that takes into account both physical psychological contributions
  • A reticence to acknowledge the existence of or seek help for mental health problems
    Therefore, conventional mental health interventions, while important, are not necessarily the biggest piece of the puzzle. Culturally creative approaches may be necessary in instances where mental health interventions are required.

Primary Care Guidelines for refugees
Below is a link to an evidence-based preventative care checklist for new immigrants and refugees from the Central Middle East: http://www.ccirhken.ca/ccirh/checklist_website/en/central_middle_east.html .

IDC Journal Club – Thursday February 18, 2016

Bria Sharkey (PR3 Enhanced Skills HIV, UB) presented the paper “On-Demand Preexposure Prophylaxis in Men at High Risk for HIV-1 infection” by Molina et al. in The New England Journal of Medicine (2015). Antiretroviral preexposure prophylaxis has shown to reduce the risk of human immunodeficiency virus type 1 (HIV-1) infection in some studies, but conflicting results have been reported among, studies, probably due to challenges of adherence to a daily regimen. The goal of the study was to assess the efficacy and safety of sexual activity- dependent preexposure prophylaxis with TDF-FTC among high risk men who have sex with men in France and Canada.

Study Design:
A double-blind, randomized trial of antiretroviral therapy for pre-exposure HIV-1 prophylaxis among men who have unprotected anal sex with men. Participants were randomly assigned to take a combination of tenofovir disoproxil fumarate (TDF) and emtricitabine (FTC) or placebo before and after sexual activity. All participants received risk-reduction counselling and condoms and were regularly tested for HIV-1 and HIV- 2 and other sexually transmitted infections.

Findings:
A total of 16 HIV-1 infections occurred during follow-up, 2 in the TDF-FTC group and 14 in the placebo group, a relative reduction in the TDF-FTC group of 86%. Participants took a median of 15 pills of TDF-FTC or placebo per month. The rates of serious adverse events were similar in the two study groups. In the TDF-FTC group, as compared with the placebo group, there were higher rates of gastrointestinal adverse events and renal adverse events.

Conclusion:
The study concluded that the use of TDF-FTC before and after sexual activity provided protection against HIV-1 infection in men who have sex with men. However, the treatment was associated with increased rates of gastrointestinal and renal adverse events.

IDC Journal Club – Thursday April 14, 2016

Miguel Pedromingo (Internal Medicine Resident) presented on the paper “Opioid Abuse in Chronic Pain- Misconceptions and Mitigation Strategies” by Volkow et al., The New England Journal of Medicine (2016). The review focuses on pharmacologic properties of opioids that underlie both their therapeutic effects and their abuse-producing effects and on the ways in which these properties should inform us in correction common clinical misconceptions that interfere with the proper prescription and monitoring of opioids in the management of chronic pain.

Misconceptions:
The authors expand on the misunderstanding among physicians regarding the important differences between physical dependence and addiction.

Mitigation Strategies:
The rewarding effects of opioids play a major role in the risks of opioid diversion, overdose, and addiction. There are common strategies that can help mitigate all risks, including limiting the prescribed opioid to the lowest effective dose for the shortest effective duration without compromising effective analgesia

Preventing drug diversion
-Screening tools to identify patients with substance-use disorder
-Use data from the Prescription Drug Monitoring Program

Reducing Risk of overdose
-Overdose risk assessment
-Urine drug screening before prescription of opioids
-Education
-Opioid treatment agreement
-Caution prescribing high doses or long-acting opioids
-Frequent follow-ups
-Naloxone

Minimizing the risk of addiction
-Primary care setting
-Assessment of addiction risks
-Referral for specialty addiction treatment when indicated
-Comprehensive, continuing care and monitoring

Conclusion:

The authors recommend three practice and policy changes that can reduce abuse-related risks and improve the treatment of chronic pain. The three recommendations are increasing use of science-supported prescribing and management practices, increasing medical school training on pain and addiction and increasing research on pain.

IDC Journal Club – Thursday May 26, 2016

Tara Andrusiak (R3 Enhanced Skills HIV) presented on the paper “Use of Abacavir and Risk of Cardiovascular Disease Among HIV-Infected Individuals” by Marcus et al., Journal of Acquired Immune Deficiency Syndromes (2016). The authors evaluated the effect of abacavir on CVD in HIV-infected individuals initiating ART, using inverse-probability weighting estimation.

Methods:
The authors studied 8154 subjects without prevalent CVD who had initiated their first combination ART regimen after abacavir was introduced.

Findings:
8154 patients were observed. 178 individuals had great or equal to 1 CVD event, 3.4% in the abacavir group and 2.1% in the group without abacavir. The individuals on abacavir had more renal dysfunctions at antiretroviral therapy initiation.

Conclusion:
The study concluded that abacavir was associated with an over 2-fold increased risk of CVD, which was not explained by renal dysfunction or other risk factors. Thus, physicians must weigh the benefits of abacavir vs. the risks of CVD when prescribing it to patients.

IDC Journal Club – Thursday June 23, 2016

Serena Chalmers presented on the paper “Hydromorphone Compared with Diacetylmorphine for Long-term Opioid Dependence-A Randomized Trail” Dr. Eugenia Oviedo-Joekes and colleagues published at JAMA Psychiatry 2016 May 1;73(5):447-55. The study objective was to test if injectable hydromorphone hydrochloride is non-inferior to injectable diacetylmorphine in reducing illicit heroin use for chronic injection opioid users after 6 months of intervention.

Study Method:
This was a double-blind randomized clinical trial on 202 long term street opioid injectors in Vancouver, BC. Participants either received injectable diacetylmorphine or hydromorphone (up to 3 times daily) for 6 months under supervision. The outcomes measured were inclusive of self-reported days of street heroin use, days of any street-acquired opioids in the prior 30 days, and the proportion of urinalyses positive for street heroin markers.

Interpretation:
Study concluded a non-inferiority of injectable hydromorphone relative to diacetylmorphine for long-term opioid dependence. In areas where diacetylmorphine is not available or for patients in whom it is contraindicated, hydromorphone could be offered as an alternative. The proportion of urinalyses positive for street heroin markers was also estimated with margin of 10% of the observed rate in the diacetylmorphine group.

Critique and Discussion:

A limitation of this study is the fact that two of the study outcomes were based on self-report of street heroin users, although urine sample increased the reliability by reducing the reporting bias. The study suggest that hydromorphone is as effective as diacetylmorphine for individuals with severe opioid use disorder and can be used as an alternative licensed drug for maintenance treatment of opioid users.

IDC Journal Club – Thursday June 23, 2016

Nancy Chow presented a paper on the acceptability and feasibility of pharmacist-provided rapid testing for human immunodeficiency virus (HIV) infection in community pharmacies. Apart from rapid HIV testing, consultation and linkage to confirmatory HIV testing services was also implemented in two sites in Michigan. The title of the paper was “Pharmacist-provided rapid HIV testing in two community pharmacies” published by Journal of the American Pharmacists Association (2015; 55:81-88).

Study Method:

Marketing techniques were employed to select study participants for free rapid (median time of 30 minutes) HIV testing. Understudy outcomes were inclusive of number of HIV tests performed, time required for HIV testing services, description of participants who received an HIV test, and pharmacist and participant perception of the HIV testing experience.

Interpretation:

Participants had a median age of 23 (range, 18–61) years and were diverse by gender (59.4% women) and race (46.4% black; 39.1% white). This was the first HIV test for 42% of participants, many of whom reported high risk behaviors in the prior 6 months. Participants and pharmacists reported favorable perceptions of the HIV testing experience. The acceptability and feasibility of pharmacist-provided rapid HIV testing in two community pharmacies with
distinct characteristics were demonstrated in this study.

Critique and Discussion:

This was a small study based on a non-randomized population, hence non-representative of all populations who may choose to receive pharmacy-based HIV testing. Moreover, may have overestimated the time required to conduct HIV testing due to inability to differentiate between time spent on study versus usual testing activity. Free HIV testing in the study may not truly reflect the feasibility of a paid- pharmacy.

IDC Journal Club – Thursday Sep 15, 2016

Sanjeev Bains presented evidence based drug information on “Opioids in Chronic Non-Cancer Pain”, aimed to inform the audience on the benefits and harms of opioid prescribing. Significant evidence gaps exist in this area of treatment including the unknown benefits and harms with using opioid therapy in chronic non-cancer pain patients. Poor efficacy, intolerable short-term side effects and opioid misuse disorder are common ongoing concerns with every patient. For these reasons, an opioid trial of 2-6 weeks is recommended, along with frequent and close monitoring eg. every 3 months.

CfE Journal Club – Thursday September 29, 2016

Ignacio Rozada presented a research project aimed at estimating the impact of treatment churn on HIV transmission risk. Individuals in the acute and late-stage phases of HIV have higher transmission risk (26 and 7 times respectively), whereas individuals on ART that are virologically suppressed are estimated to have only a 4% relative transmission risk when compared to a chronic untreated individual. We estimated a measure of lifetime risk by combining these risk estimates with life expectancy based on several scenarios that depended on treatment adherence.

Study Method:

They estimated the lifetime transmission risk, defined as the number of chronic-equivalent days from HIV infection to death, among individuals in both the natural history and on-ART scenarios. The natural history risk estimates were determined from known viral load and life expectancy curves. The on-ART scenario combined estimates on life expectancy, treatment churn and associated changes in viral load to estimate transmission risk.

Interpretation:

It was estimated that individuals in the natural history scenario have a lifetime risk of 12.7 chronic-equivalent years, on a life expectancy of 11 years. In the on-ART scenario, we estimated that individuals with high adherence have 7.0 risk years on 47.3 years of life expectancy, individuals at median adherence had 8.9 risk years on 33.8 years of life expectancy, and individuals with low adherence had 11.4 risk years on 17.6 years of life expectancy.

Critique and Discussion: 

Despite significant increases in life expectancy in individuals on ART, the overall lifetime transmission risk is lower than the natural history scenario. In fact, individuals with the longest life expectancies are estimated to have the lowest lifetime transmission risk.

CfE Journal Club – Thursday November 24, 2016

Pilar Vizcarra presented on the paper “Atrial Fibrillation and Atrial Flutter in Human Immunodeficiency Virus-Infected Persons” by Hsu et al. in the Journal of the American College of Cardiology (2013). The authors investigated the associations of traditional risk factors and longitudinal measures of human immunodeficiency virus (HIV) severity with the risk of incident atrial fibrillation (AF) in a contemporary cohort of people living with HIV (PLHIV).

Study design:

They examined the independent associations of demographic characteristic, time-updated comorbidities, and time-updated clinical measurments including CD4+ cell count and plasma viral load (pVL) with the outcome of incident AF using proportional hazards regression for multivariable analysis.

Interpretation:

In their cohort of PLHIV, they found an incidence rate of AF of 3.6/1,000 person-years. Lower CD4+ cell count and higher pVL, assessed by multiple time-updated measures, were independently associated with development of AF. Older age and the presence of traditional risk factors increased the risk of AF.

Critique and Discussion:

A limitation of this study is the fact that they did not include a control group, making difficult to compare frequency rates with general population. However, it is the first study to assess AF incidence rates in PLHIV, suggesting that HIV infection severity may be linked with the development of AF.

IDC Journal Club – Thursday Dec 8, 2016

Joanna Mereu presented the paper “HIV Associated Neurocognitive Disorders in the Modern Antiviral Treatment Era: Prevalence, Characteristics, Biomarkers, and Effects of Treatment” by Chan P. and Brew B. in Current HIV/AIDS reports (2014).

Summary:

The introduction of cART has changed not only the HIV related morbidity and mortality but also the neurocognitive impairment associated with HIV from HAND to milder forms (Asymptomatic Neurocognitive Impairment and Mild Neurocognitive Disorder). Various plasma and CSF biomarkers are currently considered as predictors of cognitive impairment and several radiological tools are discussed as providing radiological evidence of disease.The variable CNS penetration by ARVs is also discussed as well as the progression of neurocognitive impairment despite an undetectable plasma viral load, which suggests continuing CNS viral replication.

Conclusion:

Despite significant advances in cART, neurocognitive impairment remains prevalent in HIV patients. These impairments, although milder, continue to progress despite good adherence to treatment and an undectable viral load. This deserves further work in identifying better biomarkers of disease and a better use of current radiological tools. CNS penetrating ARV regimes will also need to be further refined.

CfE Journal Club – Thursday Jan 19, 2017

Kiffer Card presented the paper “Exploring the role of sex-seeking apps and websites in the social and sexual lives of gay, bisexual and other men who have sex with men: a cross-sectional study” by Card et al. in Sexual Health (2016). The authors examine the association between online sex seeking and a number of other explanatory factors focusing on demographics, social behaviour, and prevention-related sexual behaviour.

Study design:

Gay, bisexual, and other men who have sex with men were recruited into the Momentum Health Study using respondent-driven sampling, a form of referral-chain based sampling. Cross-sectional data were used to identify the covariates of online sex-seeking in the past six months.

Interpretation:

Contrary to what is commonly believed, univariable results show that men who seek sex online were not less likely to participate in the gay community. Multivariable results showed that online sex seekers were more likely to be younger, college educated, have more Facebook friends, spend more social time with other gay men, and were less likely to identify emotionally with the gay community. Further, they had displayed high sensation-seeking behaviour, were more likely to engage in serodiscordant/unknown condomless anal sex, use strategic positioning, ask their partner’s HIV-status prior to sex, and have ever been tested for HIV.

Critique and Discussion:

Although online sex-seekers engage in greater CAS, they are not necessarily at greater risk for HIV considering they are more likely to engage in greater risk-reducing behaviour. However, acknowledging that there may be greater risk in online settings due to imperfect application of these prevention strategies, promoting pro-social altruistic interventions and interventions with messaging that is acceptable to men with high sexual sensation seeking might be effective strategies to negate the risks occurring in the environments. Considering that online sex-seekers were no less likely to connect in person, these prevention campaigns should use both online and offline methods to reach online-sex seekers.

IDC Journal Club – Thursday March 2, 2017

Nicholas Baldwin presented an overview of a study titled “The efficacy and safety of tenofovir alafenamide versus tenofovir disoproxil fumarate in antiretroviral regimens for HIV-1 therapy”, a meta-analysis published by Wang et al. in the journal Medicine in 2016. In this study, the authors reviewed the literature comparing a novel form of the nucleotide reverse transcriptase inhibitor tenofovir alafenamide, also known by the abbreviated form ‘TAF’, to the existing agent tenofovir disoproxil fumarate (TDF). TAF has been proposed to be an equally efficacious form of tenofovir with less renal and bone toxicity, which is a well-documented phenomenon observed with TDF containing regimens.

Study design:

The authors performed a literature review, retrieving articles published up until March 2016, that included randomized controlled trials with HIV-1 infected patients over the age of 18, comparing treatment with TAF vs. TDF containing regimens. 6 RCTs involving 5888 patients were selected for the meta-analysis which included treatment-naïve patients and treatment-experienced patients who were switched from TDF to TAF containing regimens. The outcomes observed were treatment efficacy, as defined by a viral load

Results:

At week 48, viral suppression rates were similar between the TAF and TDF groups (90.2% vs. 89.5% respectively) for treatment-naïve patients, and superior for treatment-experienced patients who switched from TDF to TAF containing regimens (96.4% vs. 93.1%). Both agents were well tolerated with low rates of treatment failure and resistance. The group receiving TAF had significantly smaller reductions in eGFR and less proteinuria. The treatment naïve group receiving TAF showed a lesser reduction in bone mineral density (BMD), and the treatment experienced patients who switched from TDF to TAF demonstrated an increase in BMD at both the hip and spine. The TAF group showed increases in levels of total cholesterol, HDL, and LDL, with no change in the total cholesterol/HDL ratio.

Conclusion:

The authors conclude that TAF has a similar efficacy and tolerability to TDF in treatment experienced and naïve patients, with improved safety in terms of renal and bone toxicity. A limitation to this study is the relative homogeneity of third agents used in the RCTs selected. 86.5% of patients in the TAF group were receiving regimens containing elvitegravir/cobicistat as a third agent. There is still somewhat limited data on patients taking TAF with protease inhibitors, NNRTs, or other integrase inhibitors other than elvitegravir. TAF is now available through the CFE formulary for selected patients.

IDC Journal Club – Thursday May 11, 2017

Ashley Goodman, Shelda Kastor, Elmer Azak, and Tracey Morrison presented the paper ‘“They treated me like crap and I know it was because I was Native”: The healthcare experiences of Aboriginal peoples living in Vancouver’s inner city’ by Goodman et al. in Social Science & Medicine (2017). A short documentary film based on the publication was also presented.

Study Design:

In response to the healthcare inequalities that burden Aboriginal peoples, this research aimed to explore the healthcare experiences of Aboriginal peoples who use(d) illicit drugs and/or illicit alcohol living in Vancouver’s inner city. In partnership with the BC Centre for Excellence in HIV/AIDS, Board Members of the Western Aboriginal Harm Reduction Society served as community researchers and led the study design, data collection and analysis. Peer-facilitated talking circles were used to explore community members’ experiences accessing healthcare services and patient-provider encounters.

Results:

Participants’ stories demonstrated how healthcare inequalities among Aboriginal peoples are perpetuated by cultural and institutional racism. Stigmatizing racial stereotypes were perceived to influence individual attitudes and clinical practice. Symptoms and health concerns were described as trivialized by healthcare practitioners, and were perceived to result from stigma attached to Aboriginal ancestry, illicit substance use, and living in the inner city. This dismissal often resulted in disengagement from care or delay in care.

Conclusion:

The findings suggest healthcare providers must apply their knowledge of the social determinants of health in order to understand the structural forces that influence racial disparities in healthcare and personal biases in clinical practice. Adequate clinical protocols for pain management within the context of illicit substance use are urgently needed. The valuation of Aboriginal peoples and cultures within healthcare is paramount to addressing the health gap between Aboriginal and non-Aboriginal Canadians.

For more information about the Western Aboriginal Harm Reduction Society: http://wahrs.ca/
Recommended resource for cultural competency and safety in healthcare settings: http://www.sanyas.ca/training