Helen Trottier

Helen Trottier
Université de Montréal | UdeM

Epidemiology

About

105
Publications
12,101
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4,300
Citations
Citations since 2017
52 Research Items
2092 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300

Publications

Publications (105)
Article
We conducted a systematic review and network meta-analyses evaluating the effects of different intraoperative vasoactive drugs on acute kidney injury (AKI) and other perioperative outcomes in adult liver transplant recipients. We searched multiple electronic databases using words from the "liver transplantation" and "vasoactive drug" domains. We in...
Article
Importance: The prevalence of human papillomavirus (HPV) infection during pregnancy and its risk of transmission to newborns are not well documented. Objective: To ascertain the prevalence of HPV in pregnant women, the risk of HPV detection in the placenta and in children at birth, and the probability that HPV detected at birth may persist in ne...
Article
Background: Toxic metals, such as lead (Pb), cadmium (Cd), arsenic (As), and mercury (Hg), may be associated with a higher risk of gestational hypertension and preeclampsia, whereas manganese (Mn) is an essential metal that may be protective. Objectives: We estimated the individual, independent, and joint associations of Pb, Cd, As, Hg, and Mn o...
Article
Background: Restrictive transfusion practices are increasingly being followed in pediatric intensive care units (PICU); consequently, more patients are discharged anemic from PICU. Given the possible impact of anemia on long-term neurodevelopmental outcomes, we aim to describe the epidemiology of anemia at PICU discharge in a mixed (pediatric and...
Article
Introduction: We assessed the incidence and risk factors for first detection and redetection with the same human papillomavirus (HPV) genotype, and prevalence of cytological lesions during HPV redetections. Methods: The Ludwig-McGill cohort study followed women aged 18-60 years from São Paulo, Brazil in 1993-1997 for up to 10 years. Women provid...
Article
Background: The impact of different therapeutic classes of drugs in antiretroviral therapy (ART) regimens on the CD4/CD8 ratio is not well documented in people treated for HIV. The objective of this study was to analyse the long-term effect of exposure to integrase strand transfer inhibitor (INSTI) on CD4/CD8 ratio compared to non-nucleoside rever...
Article
Full-text available
Introduction: One of the most effective diagnostic tools for pancreatic cancer is endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) or biopsy (EUS-FNB). Several randomized clinical trials have compared different EUS tissue sampling needles for the diagnosis of pancreatic cancer. Objective: To compare the diagnostic accuracy of EUS-gu...
Preprint
Full-text available
Introduction We assessed the incidence of redetection with the same human papillomavirus (HPV) genotype, predictors of first HPV detections and redetections, and prevalence of cytological lesions during HPV redetections. Methods The Ludwig-McGill cohort study followed women aged 18-60 years from São Paulo, Brazil in 1993-1997 for up to 10 years. W...
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Background: Despite high gestational diabetes mellitus (GDM) prevalence in South Africa (9.1% in 2018), its screening and management are not well integrated into routine primary health care and poorly linked to post-GDM prevention of type 2 diabetes mellitus (T2DM) in South Africa's fragmented health system. This study explored women's, health car...
Article
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Introduction: Many adults diagnosed with gestational diabetes mellitus (GDM) and type 2 diabetes mellitus (T2DM) also have other known or unknown comorbid conditions. The rising prevalence of GDM and T2DM within a broader context of multimorbidity can best be addressed through an integrated management response, instead of stand-alone programs targ...
Article
Objective Human papillomavirus (HPV) has been associated with adverse pregnancy outcomes but placental HPV infection has been rarely studied. The objective was to determine the proportion of HPV-positive placentas and the associated risk factors among HPV-positive women during pregnancy. Methods We analysed data from pregnant women enrolled in HER...
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Background: Liver transplantation is associated with major bleeding and red blood cell (RBC) transfusions. No well-designed causal analysis on interventions used to reduce transfusions, such as an intraoperative phlebotomy, has been conducted in this population. Methods: We conducted a historical cohort study among liver transplantations perform...
Article
Purpose: The use of intravenous immunoglobulins (IVIG) has increased significantly in the last decade causing challenges for blood suppliers to respond to the demand. Indications for which IVIG infusion should be given to critically ill children remain unclear. The objective of this study is to characterize the epidemiology of IVIG use in this popu...
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Importance Preterm birth remains a leading cause of perinatal mortality and lifelong morbidity worldwide. The cause of most preterm births is unknown, although several infectious processes have been implicated. Objective To assess whether human papillomavirus (HPV) infection, a frequent infection among women of childbearing age, is associated with...
Article
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Background: Epstein-Barr virus (EBV) and cytomegalovirus (CMV) infections can have serious consequences during the period of aplasia and lymphopenia following hematopoietic stem cell transplantation (HSCT). Large pediatric cohort studies examining the effect of antiviral prophylaxis against these viruses are scarce. The present study aimed to anal...
Article
Background Epstein-Barr virus (EBV) can cause severe disease following hematopoietic stem cell transplant (HSCT), including post-transplant lymphoproliferative disorder (PTLD). The objective was to analyze risk factors associated with post-transplant EBV outcomes among pediatric allogeneic HSCT recipients. Methods We used data from 156 pediatric a...
Article
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This systematic review was undertaken to identify risk factors associated with post-transplant Epstein–Barr virus (EBV) active infection and post-transplant lymphoproliferative disease (PTLD) in pediatric and adult recipients of hematopoietic stem cell transplants (HSCT). A literature search was conducted in PubMed and EMBASE to identify studies pu...
Article
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Background Implementation of the programmes for the Prevention of Mother to Child Transmission (PMTCT) of Human Immunodeficiency Virus (HIV) into antenatal care over the last three decades could inform implementation of interventions for other health challenges such as gestational diabetes mellitus (GDM). This study assessed PMTCT outcomes, and how...
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Background and objectives: The aim of the study was to perform the first randomized trial comparing the diagnostic yield, bloodiness, and cellularity of the 25G standard needle (25S) and the 25G ProCore™ needle (25P). Materials and methods: All patients referred to the tertiary care referral center for EUS guided fine-needle aspiration (EUS-FNA)...
Article
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There is uncertainty regarding the potential virologic outcome associated with a change in antiretroviral therapy (ARV) among PLHIV who had previous documented virologic failure or who have been exposure to mono/dual nucleoside reverse transcriptase inhibitors (NRTI) therapy. The objective was to measure the potential impact of exposure to previous...
Article
The long-term outcome of ART-naïve people living with HIV (PLHIV) with baseline CD4 count ≥350 is not well described. We aimed to analyze mortality in an ART-naïve West African cohort of PLHIV followed for 18 years according to the effects of CD4 cell count stratum (350-499 versus ≥500), HIV serotype and immune activation (IA). The cumulative inci...
Article
Background Epstein‐Barr virus (EBV) is carried in the blood of most adults, and transfusion‐related infections have been reported. EBV is particularly deleterious in immunosuppressed transplant patients. The aim was to determine if EBV transmission occurred through leukodepleted blood product transfusion in pediatric recipients of hematopoietic ste...
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Background Switching antiretroviral regimens when HIV viremia is controlled for a new regimen is challenging when there is the potential for prior nucleoside reverse transcriptase inhibitor (NRTI) resistance. The objective was to study virologic outcomes after switching to dolutegravir compared to remaining on a boosted protease inhibitor (PI/r) re...
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Background: Integrating Prevention of Mother-to-Child Transmission (PMTCT) programmes into routine health services under complex socio-political and health system conditions is a priority and a challenge. The successful rollout of PMTCT in sub-Saharan Africa has decreased Human Immunodeficiency Virus (HIV), reduced child mortality and improved mat...
Article
Introduction. Persistent human papillomavirus (HPV) type 16 infection is the main causal agent of cervical cancer. Most HPV infections clear spontaneously within 1–2 years. Although not all infected women develop detectable HPV antibodies, about 60–70 % seroconvert and retain their antibodies at low levels. Aim. We investigated if cervical HPV16 DN...
Preprint
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Background Integrating vertical programmes into routine health services under complex socio-political and health system conditions is a priority and a challenge. The successful rollout of Prevention of Mother-to-Child Transmission programmes (PMTCT) in sub-Saharan Africa has decreased Human Immunodeficiency Virus (HIV), reduced child mortality and...
Article
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Background: There is a paucity of data on the dynamics of human papillomavirus (HPV) antibodies in children. We aimed to describe the vertical transmission and clearance of antibodies against HPV6, 11, 16 and 18 in children. Methods: We used data from pregnant women recruited into the HERITAGE cohort study between 2009 and 2012 who were positive fo...
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Background The potential association between the presence or replacement of dental amalgams and gestational hypertension (GH) is unclear. Objective To assess the association between the presence or replacement of dental amalgams and the risk of GH in a prospective cohort study. Methods We assessed dental amalgam status (presence or replacement),...
Article
Background Tricuspid regurgitation (TR) is common among adults with corrected tetralogy of Fallot (TOF) or pulmonary stenosis (PS) referred for pulmonary valve replacement (PVR). Yet, combined valve surgery remains controversial. Objectives This study sought to evaluate the impact of concomitant tricuspid valve intervention (TVI) on post-operative...
Article
Background: Experimental studies provide evidence of harmful effect of Human papillomavirus (HPV) infection on pregnancy, but observational studies are inconclusive. We systematically assessed the association between HPV and adverse pregnancy outcomes. Methods: We searched electronic databases up to December 1st, 2019. We included observational...
Article
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Background: Early antiretroviral therapy (ART) during pregnancy has dramatically reduced the risk of perinatal HIV transmission. However, studies have shown an association between premature delivery and the use of ART during pregnancy (particularly protease inhibitor (PI)-based therapies), which could be explained by placental dysfunction. The obj...
Preprint
Full-text available
Background: Early antiretroviral therapy (ART) during pregnancy has dramatically reduced the risk of perinatal HIV transmission. However, studies have shown an association between premature delivery and the use of ART during pregnancy (particularly protease inhibitor (PI)-based therapies), which could be explained by placental dysfunction. The obje...
Preprint
Full-text available
Background: Early antiretroviral therapy (ART) during pregnancy has dramatically reduced the risk of perinatal HIV transmission. However, studies have shown an association between premature delivery and the use of ART during pregnancy (particularly protease inhibitor (PI)-based therapies), which could be explained by placental dysfunction. The obje...
Article
Full-text available
HPV vaccination efficacy has been shown in clinical trials but it is important to verify population level vaccine effectiveness (VE). We aimed to explore VE and herd effect using HPV infection data from a cohort study of Canadian pregnant women. We analyzed the baseline data of the HERITAGE study, which includes pregnant women recruited in Montreal...
Article
Background Thromboembolic events contribute greatly to morbidity and mortality following Fontan surgery for univentricular hearts. Objectives This study sought to evaluate the effect of type of Fontan surgery on thromboembolic risk. Methods A North American multicenter retrospective cohort study enrolled 522 patients with Fontan palliation consis...
Poster
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In the view of ART success, HIV infected individuals are living at least 30 years beyond their age at diagnosis, thus increasing the probability of developing age-related problem as such reduced bone density. Tenofovir Disoproxil Fumarate (TDF) has been associated with a greater risk of bone loss at both lumbar and hip locations. In studies on Bone...
Article
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Introduction Multi-morbidity, defined as the co-existence of more than one chronic condition in one person, has been increasing due to comorbid non-communicable and infectious chronic diseases (CNCICDs). Type 2 diabetes (T2D) and gestational diabetes mellitus (GDM) incidences within the CNCICDs conditions are increasing and overwhelming already wea...
Article
Background Little is known about the association between bisphenol A (BPA) or triclosan (TCS) exposure and hypertension in pregnancy. Objective To investigate potential associations between maternal urinary concentrations of BPA or TCS and gestational hypertension (GH) and preeclampsia. Study Design Among 1,909 pregnant women participating in the m...
Article
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We aimed to report on a 2015 HIV care cascade for patients participating in the Quebec HIV Cohort (formerly Cohorte Montréalaise).
Article
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L’objectif de cette étude était de décrire la cascade de soins du VIH des patients de la Cohorte VIH du Québec (ancien - Cohorte Montréalaise) pour l’année 2015.
Article
As per the American Society for Colposcopy and Cervical Pathology guidelines, human papillomavirus (HPV) testing is currently used as part of cervical cancer screening and during colposcopy follow-up. The present project evaluated if the application of acetic acid (AA) impacts HPV test results. Methods: We conducted a prospective nonrandomized in...
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We examined the association between a history of smallpox vaccination and immune activation (IA) in a population of antiretroviral therapy-naïve people living with HIV (PLHIV). A cross-sectional study was conducted in Senegal from July 2015 to March 2017. Smallpox vaccination was ascertained by the presence of smallpox vaccine scar and IA by the pl...
Article
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Background The global scale-up of Prevention of mother-to-child transmission (PMTCT) services is credited for a 52% worldwide decline in new HIV infections among children between 2001 and 2012. However, the epidemic continues to challenge maternal and paediatric HIV control efforts in Sub Saharan Africa (SSA), with repercussions on other health ser...
Article
Objective: Use of Pre-Exposure Prophylaxis (PrEP) for HIV raises concerns about sexually transmitted infection (STI) incidence due to decreased condom use among men who have sex with men (MSM). This study examines whether PrEP is associated with STIs in the 12-months following PrEP prescription relative to the 12-months prior to PrEP and if STI ra...
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Background Human papillomavirus (HPV) is the most prevalent genital infection, especially in young women of reproductive age. In vitro and animal model experiments provide compelling evidence of the harmful effect of HPV on pregnancy outcomes, but results from epidemiologic studies are inconclusive. We aim to determine the strength of the relations...
Article
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Perinatal route of transmission of human papillomavirus (HPV) has been demonstrated in several small studies. We designed a large prospective cohort study (HERITAGE) to better understand perinatal HPV. The objective of this article is to present the study design and preliminary data. In the first phase of the study, we recruited 167 women in Montre...
Article
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Background Parity is well established as a risk factor for cervical cancer. It is not clear, however, how pregnancy influences the natural history of HPV infection and cervical neoplasia. Our objective was to study the risk of HPV infection and cervical squamous intraepithelial lesions (SIL) after pregnancy. Methods We used the Ludwig-McGill cohor...
Article
This study examined the prevalence of three human herpesviruses (HHV), namely HHV-4 (Epstein–Barr virus/EBV), HHV-6b and HHV-7 in leucoreduced blood products obtained from the Sainte-Justine Hospital blood bank. A total of 100 specimens, including 34 red blood cell concentrates, 33 platelet bags and 33 plasma units, were collected and screened by a...
Article
To identify the potential complications associated with RBC transfusions. Prospective observational study. PICU in a tertiary children's hospital. All children consecutively admitted to our PICU during a 1-year period. None. Data were abstracted from medical charts prospectively. Outcomes possibly attributable to RBC transfusions were looked for da...
Article
Respiratory complications associated with RBC transfusions may be underestimated in PICUs because current definitions exclude patients with preexisting respiratory dysfunction. This study aims to determine the prevalence and characterize the risk factors and outcomes of new or progressive respiratory dysfunction observed after RBC transfusion in cr...
Article
We aimed to provide updated information about the global estimates of attributable fraction and type distribution of human papillomavirus (HPV) in head and neck squamous cell carcinomas by doing a systematic review and meta-analysis. We did a literature search on PubMed to identify studies that used PCR for detection of HPV DNA in head and neck squ...
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Background Children unreached by vaccination are at higher risk of poor health outcomes and India accounts for nearly a quarter of unvaccinated children worldwide. The objective of this study was to investigate compositional and contextual determinants of non-receipt of childhood vaccines in India using multilevel modelling. Methods and Findings W...
Article
Red blood cell (RBC) transfusions are common in the pediatric intensive care unit (PICU). However, there are no recent data on transfusion practices in the PICU. Our objective was to determine transfusion practice in the PICU, to compare this practice with that observed 10 years earlier, and to estimate the compliance to the recommendation of a lar...
Article
What is the prevalence of human papillomavirus (HPV) in semen? HPV is present in the semen of asymptomatic men, with a pooled prevalence in a random effects meta-analysis of populations seeking fertility evaluation/treatment of 16%, versus 10% in other populations. The main risk of donor insemination (DI) is known to be contamination with an infect...
Article
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Background: The current goal of antiretroviral therapy (ART) is to maintain a suppressed human immunodeficiency virus (HIV) viral load below limits of assay detection. When viral loads remain in low-level viremia (LLV), especially between 50 and 200 copies/mL, the best management and clinical consequences remain unknown. Our objective was to study...
Article
Juvenile recurrent respiratory papillomatosis is caused mainly by human papillomavirus genotypes 6 or 11, acquired at birth or during pregnancy from an infected mother. Recurrent respiratory papillomatosis is characterized by recurring warts growing most commonly in the larynx. Multiple surgical procedures and the risk of airway obstruction contrib...
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Abstract Hyperbilirubinemia is common among patients exposed to atazanavir (ATV), but its long-term significance is not well documented. The objective was to analyze hyperbilirubinemia (incidence, regression, determinants, and outcome) among 1150 HIV-positive patients followed-up in a prospective cohort between 2003 and 2012. Cumulative incidence o...
Chapter
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Human papillomaviruses (HPVs) are infectious agents responsible for emergence of anogenital subclinical and clinical infections. HPV infections are the most common sexually transmitted infections worldwide. More than 100 HPV genotypes have been catalogued so far and from these, over 40 genotypes infect mucosa of anogenital tract and other mucosal a...
Article
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Background: Exploring the presence and role of human papillomavirus (HPV) in head and neck cancer (HNC) is a necessary step to evaluate the potential impact of HPV prophylactic vaccines. Objective: To assess the prevalence and oncogenic role of HPV in HNC in Senegal. Methods: This is a multicenter cross-sectional study. Paraffin-embedded block...
Article
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Red blood cell (RBC) transfusions are frequent in critically ill children. Their benefits are clear in several situations. However, issues surrounding their safety have emerged in the past decades. It is important to identify the potential complications associated with RBC transfusions, in order to evaluate their risk-benefit ratio better.
Article
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Background: Some studies have shown that tenofovir disoproxil fumarate (TDF), a drug widely used in highly active antiretroviral therapy, is associated with kidney dysfunction, but the magnitude of the effect and its clinical impact is still being debated. Our objective was to evaluate the association between long-term TDF exposure and kidney dysf...
Article
Objectives: To describe human papillomavirus (HPV) distribution in invasive cervical carcinoma (ICC) from Mali and Senegal and to compare type-specific relative contribution among sub-Saharan African (SSA) countries. Methods: A multicentric study was conducted to collect paraffin-embedded blocks of ICC. Polymerase chain reaction, DNA enzyme immu...
Article
BACKGROUND: Blood safety warrants strict screening measures to minimize the risk of transmitting blood-borne pathogens. However, transfusion-transmitted infections for which testing is not currently performed continue to be a concern. Among these untested agents is Epstein-Barr virus (EBV) which, in the transplant setting, is associated with lympho...
Article
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Human immunodeficiency virus (HIV)-seropositive men who have sex with men (MSM) are at risk for anal intraepithelial neoplasia (AIN) and cancer. The goal of this study was to identify risk factors associated with high-grade AIN (AIN-2,3) in HIV-positive MSM, including the receipt of highly active antiretroviral therapy (HAART). A cohort study invol...
Article
3340 Background In many countries, numerous steps are taken to minimize the risk of infection from transfused blood or blood products. While the risk of transfusion-related infections such as HIV and HCV has become exceedingly rare, the risk of transfusion transmitted infectious diseases for which testing is not currently performed continues to be...
Article
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There is a paucity of data on whether or not women can be reinfected with human papillomavirus (HPV) types to which they were exposed to earlier in life and on the role of natural immunity. The observation of HPV infection at older ages may be explained by the reactivation of a latent infection or new exposure from sexual activity. Our objective wa...
Article
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Mutations in TP53 are common events during carcinogenesis. In addition to gene mutations, several reports have focused on TP53 polymorphisms as risk factors for malignant disease. Many studies have highlighted that the status of the TP53 codon 72 polymorphism could influence cancer susceptibility. However, the results have been inconsistent and var...
Article
The optimal transfusion threshold after surgery in children is unknown. We analyzed the general surgery subgroup of the TRIPICU (Transfusion Requirements in Pediatric Intensive Care Units) study to determine the impact of a restrictive versus a liberal transfusion strategy on new or progressive multiple organ dysfunction syndrome (MODS). The TRIPIC...