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Featured researches published by Mathieu Pelletier.


Journals of Gerontology Series A-biological Sciences and Medical Sciences | 2017

Measuring Frailty Can Help Emergency Departments Identify Independent Seniors at Risk of Functional Decline After Minor Injuries

Marie-Josée Sirois; Lauren Griffith; Jeffrey J. Perry; Raoul Daoust; Nathalie Veillette; Jacques Lee; Mathieu Pelletier; Laura Wilding; Marcel Émond

Background. This study aims to (i) describe frailty in the subgroup of independent community-dwelling seniors consulting emergency departments (EDs) for minor injuries, (ii) examine the association between frailty and functional decline 3 months postinjury, (iii) ascertain the predictive accuracy of frailty measures and emergency physicians’ for functional decline. Method. Prospective cohort in 2011–2013 among 1,072 seniors aged 65 years or older, independent in basic daily activities, evaluated in Canadian EDs for minor injuries. Frailty was assessed at EDs using the Canadian Study of Health and Aging-Clinical Frailty scale (CSHA-CFS) and the Study of Osteoporotic Fracture frailty index (SOF). Functional decline was defined as a loss ≥2/28 on the Older American Resources Services scale 3 months postinjury. Generalized mixed models were used to explore differences in functional decline across frailty levels. Areas under the receiver operating characteristic curve were used to ascertain the predictive accuracy of frailty measures and emergency physicians’ clinical judgment. Results. The SOF and CSHA-CFS were available in 342 and 1,058 participants, respectively. The SOF identified 55.6%, 32.7%, 11.7% patients as robust, prefrail, and frail. These CSHA-CFS (n = 1,058) proportions were 51.9%, 38.3%, and 9.9%. The 3-month incidence of functional decline was 12.1% (10.0%−14.6%). The Areas under the receiver operating characteristic curves of the CSHA-CFS and the emergency physicians’ were similar (0.548–0.777), while the SOF was somewhat higher (0.704–0.859). Conclusion. Measuring frailty in community-dwelling seniors with minor injuries in EDs may enhance current risk screening for functional decline. However, before implementation in usual care, feasibility issues such as inter-rater reliability and acceptability of frailty tools in the EDs have to be addressed.


Urban Studies | 2006

Becoming Visible: Women and Conflicts in the Quebec Metropolitan Areas, 1965-2000

Catherine Trudelle; Paul Villeneuve; Marius Thériault; Mathieu Pelletier

Since the 1960s, urban conflicts have tended to gain prominence in most cities of advanced economies. During the same period, women have also gained prominence in urban public life, including conflict activity. Have their roles in these conflicts had possible humanising effects on urban life? More than 2000 conflicts are analysed, hypothesising that characteristics of conflicts influence the probability of women participating in them. It is found that this probability is much higher when actors come from civil society rather than from the state or the private sector and when conflicts deal with social issues rather than economic or, surprisingly, environmental issues. It is also found that this probability diminishes with time, indicating increasing institutionalisation and diversification of womens roles in urban public life.


Archive | 2015

A Relational Database to Understand Social Innovation and Its Impact on Social Transformation

Marie J. Bouchard; Catherine Trudelle; Louise Briand; Juan-Luis Klein; David Longtin; Mathieu Pelletier

Research on social innovation has, to date, mainly been carried out through case studies. This is due to the unique character of innovations, at least when they emerge, and the fact that the concept of social innovation is still poorly codified. Case studies are typically used to explore new research areas for which existing theory seems inadequate. A case study approach is the prescribed methodology to explore phenomena that are not easily distinguishable from their context and to document them thoroughly by referring to multiple information sources (Yin, 1994).


CJEM | 2018

Using the Bergman-Paris Question to screen seniors in the emergency department

Antoine Laguë; Philippe Voyer; Marie-Christine Ouellet; V. Boucher; M. Giroux; Mathieu Pelletier; E. Gouin; Raoul Daoust; Simon Berthelot; Michèle Morin; Thien Tuong Minh Vu; Jacques Lee; Audrey-Anne Brousseau; Marie-Josée Sirois; Marcel Émond

OBJECTIVES In the fast pace of the Emergency Department (ED), clinicians are in need of tailored screening tools to detect seniors who are at risk of adverse outcomes. We aimed to explore the usefulness of the Bergman-Paris Question (BPQ) to expose potential undetected geriatric syndromes in community-living seniors presenting to the ED. METHODS This is a planned sub-study of the INDEED multicentre prospective cohort study, including independent or semi-independent seniors (≥65 years old) admitted to hospital after an ED stay ≥8 hours and who were not delirious. Patients were assessed using validated screening tests for 3 geriatric syndromes: cognitive and functional impairment, and frailty. The BPQ was asked upon availability of a relative at enrolment. BPQs sensitivity and specificity analyses were used to ascertain outcomes. RESULTS A response to the BPQ was available for 171 patients (47% of the main studys cohort). Of this number, 75.4% were positive (suggesting impairment), and 24.6% were negative. To detect one of the three geriatric syndromes, the BPQ had a sensitivity of 85.4% (95% CI [76.3, 92.0]) and a specificity of 35.4% (95% CI [25.1, 46.7]). Similar results were obtained for each separate outcome. Odds ratio demonstrated a higher risk of presence of geriatric syndromes. CONCLUSION The Bergman-Paris Question could be an ED screening tool for possible geriatric syndrome. A positive BPQ should prompt the need of further investigations and a negative BPQ possibly warrants no further action. More research is needed to validate the usefulness of the BPQ for day-to-day geriatric screening by ED professionals or geriatricians.


CJEM | 2018

Performance of the French version of the 4AT for screening the elderly for delirium in the emergency department

Anne-Julie Gagné; Philippe Voyer; V. Boucher; Alexandra Nadeau; Pierre-Hugues Carmichael; Mathieu Pelletier; E. Gouin; Simon Berthelot; Raoul Daoust; Machelle Wilchesky; Hélène Richard; Isabelle Pelletier; Stephanie Ballard; Antoine Laguë; Marcel Émond

OBJECTIVES Delirium is very frequent in older patients presenting to the emergency department (ED), but is often undetected. The purpose of this study was to evaluate the performance of the French version of the 4 A’s Test (4AT-F) for the detection of delirium and cognitive impairment in older patients. METHODS The study was conducted in four Canadian ED. Participants (n= 320) were independent or semi-independent patients (able to perform ≥5 activities of daily living) aged 65 and older and had an 8-hour exposure to the ED environment. The Telephone Interview for Cognitive Status (TICS-m), the Confusion Assessment Method (CAM) as well as the 4AT-F were administered to patients at the initial interview. The CAM and 4AT-F were then administered twice a day during the patients’ ED or hospital stay. The 4AT-F’s sensitivity and specificity were compared to those of the CAM (for delirium), and to that of the TICS (for cognitive impairment). RESULTS Our results suggest that the 4AT-F has a sensitivity of 84% (95% CI: [76, 93]) and a specificity of 74% (95% CI: [70, 78]) for delirium, as well as a sensitivity of 49% (95% CI: [34, 64]) and a specificity of 87% (95% CI: [82, 92]) for cognitive impairment. CONCLUSION The 4AT-F is a fast and reliable screening tool for delirium and cognitive impairment in ED. Due to its quick administration time, it allows a systematic screening of patients at risk of delirium, without significantly increasing the workload of the ED staff.


BMJ Open | 2018

Incidence of delirium in the Canadian emergency department and its consequences on hospital length of stay: a prospective observational multicentre cohort study

Marcel Émond; V. Boucher; Pierre-Hugues Carmichael; Philippe Voyer; Mathieu Pelletier; E. Gouin; Raoul Daoust; Simon Berthelot; Marie-Eve Lamontagne; Michèle Morin; Stéphane Lemire; Thien Tuong Minh Vu; Alexandra Nadeau; Marcel Rheault; Lucille Juneau; Natalie Le Sage; Jacques Lee

Objective We aim to determine the incidence of delirium and describe its impacts on hospital length of stay (LOS) among non-delirious community-dwelling older adults with an 8-hour exposure to the emergency department (ED) environment. Design This is a prospective observational multicentre cohort study (March–July 2015). Patients were assessed two times per day during their entire ED stay and up to 24 hours on hospital ward. Setting The study took place in four Canadian EDs. Participants 338 included patients: (1) aged ≥65 years; (2) who had an ED stay ≥8 hours; (3) were admitted to hospital ward and (4) were independent/semi-independent. Main outcome(s) and measure(s) The primary outcomes of this study were incident delirium in the ED or within 24 hours of ward admission and ED and hospital LOS. Functional and cognitive status were assessed using validated Older Americans Resources and Services and the modified Telephone Interview for Cognitive Status tools. The Confusion Assessment Method was used to detect incident delirium. Univariate and multivariate analyses were conducted to evaluate outcomes. Results Mean age was 76.8 (±8.1), 17.7% were aged >85 years old and 48.8% were men. The mean incidence of delirium was 12.1% (n=41). Median IQR ED LOS was 32.4 (24.5–47.9) hours and hospital LOS was 146.6 (75.2–267.8) hours. Adjusted mean hospital LOS was increased by 105.4 hours (4.4 days) (95% CI 25.1 to 162.0, P<0.001) for patients who developed an episode of delirium compared with non-delirious patient. Conclusions An incident delirium was observed in one of eight independent/semi-independent older adults after an 8-hour ED exposure. An episode of delirium increases hospital LOS by 4 days and therefore has important implications for patients and could contribute to ED overcrowding through a deleterious feedback loop.


Cahiers de géographie du Québec | 2005

Analyse spatiale des conflits urbains : Enjeux et contextes dans la région de Québec

Florent Joerin; Mathieu Pelletier; Catherine Trudelle; Paul Villeneuve


Journal of Emergency Medicine | 2010

Successful Thrombolysis of a Stroke with a Pulmonary Embolism in a Young Woman

Mathieu Pelletier; Ronald Bugeaud; Reda Ibrahim; Gilles Morency; Simon Kouz


Environnement Urbain / Urban Environment | 2009

Les conflits urbains : une approche analytique

Paul Villeneuve; Catherine Trudelle; Mathieu Pelletier; Marius Thériault


Géocarrefour: Revue de géographie de Lyon | 2006

Acteurs urbains en conflit, Québec, 1965-2000 : essai d’analyse statistique

Paul Villeneuve; Catherine Trudelle; Mathieu Pelletier; Marius Thériault

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Catherine Trudelle

Université du Québec à Montréal

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Raoul Daoust

Université de Montréal

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Jacques Lee

Sunnybrook Health Sciences Centre

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