Ari-Nareg Meguerditchian

Ari-Nareg Meguerditchian

*This is an algorithmically generated author record based on publicly available information.

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Previous Organizations / Institutes

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Ari-Nareg Meguerditchian has a total of 134 co-authors. Here are the top co-authors by number of shared publications:

  • Carrie A. Rentschler

    Department of Art History and Communication Studies, McGill University, McCall McBain Arts Building, Room 155, 853 Sherbrooke Street West, Montreal, QC, H3A 0G5, Canada, 1 514-398-2850

    6 shared publications
  • Nina Morena

    McGill University, Montreal, Canada

    6 shared publications
  • Robyn Tamblyn

    Department of Medicine, Faculty of Medicine and Health Sciences, McGill University, Montréal, QC H4A 3J1, Canada

    6 shared publications
  • Robyn Tamblyn

    Clinical and Health Informatics Research Group, McGill University, Montreal, Canada; Department of Medicine, McGill University, Montreal, Canada; Department of Epidemiology, Biostatistics and Occupational Therapy, McGill University, Montreal, Canada

    5 shared publications
  • Diana Nguyen

    Research Institute of the McGill University Health Centre, Montreal, CA

    4 shared publications
  • Nancy Mayo

    Department of Epidemiology, Biostatistics and Occupational Therapy, McGill University, Montreal, Canada; School of Physical and Occupational Therapy, McGill University, Montreal, Canada

    4 shared publications

Latest Publications

  • Open Access

    Breast Cancer Vlogs on YouTube: Descriptive and Content Analyses

    by Nina Morena, Elly Dimya Htite, Yitzchok Ahisar, Victoria Hayman, Carrie A Rentschler, Ari N Meguerditchian

    Background: Many women with breast cancer document their experiences in YouTube vlogs, which may serve as peer-to-peer and community support. Objective: This study aimed to determine (1) the forms of content about breast cancer that tend to be discussed in vlogs, (2) the reasons why women choose to vlog their breast cancer experiences, and (3) the potential for breast cancer vlogs to serve as an alternative or complement to peer-to-peer support as well as a site of digital community overall. Methods: YouTube was searched in incognito mode in November 2023 using the search terms “breast cancer vlog.” A maximum of 10 videos/creator were included based on viewership and date created. Video characteristics collected included title; length; number of views, likes, comments; and playlist inclusion. Videos were assessed for sponsorship; presence of explanation and discussion on breast cancer; type of content; and themes. Creator characteristics included age, location, and engagement approaches. Descriptive and content analyses were performed to analyze video content and potential areas where peer-to-peer support may be provided. Results: Ninety vlogs by 13 creators were included, all from personal accounts. The mean (SD) video length, number of views, and number of comments were 21.4 (9.1) minutes, 266,780 (534,465), and 1485 (3422), respectively. Of the 90 videos, 35 (39%) included hashtags, and 11 (12%) included paid sponsorships. The most common filming location was the home (87/90; 97%), followed by the hospital (28/90; 31%) and car (19/90; 21%). Home vlogs were most often set in the living room (43/90; 44%), bedroom (32/90; 33%), or kitchen (20/90; 21%). Thirty-four of 60 videos (57%) included treatment visuals and physical findings. Creators addressed motivation for vlogging in 44/90 videos (49%); the two most common reasons were wanting to build a community and helping others. In 42/90 videos (47%), creators explicitly expressed emotion. Most common themes were treatment (77/90; 86%), mental health (73/90; 81%), adverse effects (65/90; 72%), appearance (57/90; 63%), and family relationships (33/90; 37%). Patient-directed advice was offered in 52/90 videos (58%), mostly on treatment-related issues. In 51/90 videos (57%), creators provided explicit treatment definitions. Chemotherapy was discussed in 63/90 videos (70%); surgery in 52/90 (58%), primarily mastectomy; radiation in 27/90 (30%); and general adverse effects in 64/90 (71%). Twenty-two of 90 videos (24%) were about a new diagnosis. When mentioned (40/90; 44%), the most common creator location was the United States. When mentioned (27/90; 30%), the most common age was 20‐29 years. Conclusions: The dedication to building community support by vlog creators, and the personal nature of their storytelling, may make vlogs a potential resource for peer-to-peer support.


  • Open Access

    “You’re not alone in this at all”: Descriptive and content analysis of breast cancer vlogs on YouTube (Preprint)

    by Nina Morena, Elly Htite, Yitzchok Ahisar, Victoria Hayman, Carrie A. Rentschler, Ari N. Meguerditchian

    BACKGROUND Vlogs, or “video blogs,” are personally created experiential videos based on wide-ranging topics, usually posted to YouTube. Many women with breast cancer (BC) document their cancer experiences in YouTube vlogs. These may have the potential to serve as peer-to-peer support and provide community. OBJECTIVE This study provides a descriptive and content analysis of vlogs by women with BC. METHODS YouTube was searched in incognito mode in 11/2023 using the search terms “breast cancer vlog.” A maximum of 10 videos/creator were included based on viewership and date created. Video characteristics collected included: title, length, number of views, likes, comments, and playlist inclusion. Videos were assessed for sponsorship, presence of explanation and discussion on BC, type of content, and themes. Creator characteristics included age, location, and engagement approaches. Descriptive and content analysis were performed to assess and analyze video content and potential areas where peer-to-peer support may be provided. RESULTS 90 vlogs by 13 creators were included, all originating from personal accounts. Mean video length, number of views, and number of comments were 21.4 minutes (SD 9.1), 266,780 (SD 534,465), and 1485 (SD 3422), respectively. 38.9% included hashtags. 12.2% included paid sponsorships. Most common filming location was at home (96.7%), followed by the hospital (31.1%), or in the car (21.1%). Home vlogs were most often set in the living room (44.3%), bedroom (33.0%), or kitchen (20.6%). 56.7% included visuals of treatment as well as physical findings. Creators addressed motivation for vlogging in 48.9%; the two most common reasons were wanting to build a community and helping others in a similar situation. In 46.7%, creators explicitly expressed emotion. Most common themes were treatment (85.6%), mental health (81.1%), side effects (72.2%), appearance (63.3%), and family relationships (36.7%). Subthemes included young age, finances, and the importance of online community support. Patient-directed advice was offered in 60.0%, mostly on treatment-related issues. In 56.7%, creators provided explicit treatment definitions. Chemotherapy was discussed in 70.0%; surgery in 57.8%, primarily mastectomy; radiation in 30.0%; general side effects in 71.1%. 24.4% were about a new diagnosis. When mentioned (44.4%), most common creator location was the USA. When mentioned (30.0%), most common age demographic was 20-29 years old. CONCLUSIONS Vlogs by women with BC receive significant levels of engagement. The dedication to building community demonstrated by vlog creators, and the personal nature of their storytelling, advice, and suggestions, may make these vlogs a potential resource for peer-to-peer support.

  • Open Access

    Predictors of complication after groin dissection: a single-centre experience

    by Ghader Jamjoum, Thea Araji, Diana Nguyen, Ari N. Meguerditchian

    Background: Inguinal lymphadenectomy (ILND) has historically been associated with substantial morbidity. The objective of this study was to obtain contemporary ILND morbidity rates and to identify potentially preventable risk factors. Methods: We carried out a retrospective review of medical records for all superficial, deep, and combination groin dissections performed at a single, high-volume academic centre between January 2007 and December 2020. We collected data points for patient, disease, and surgery characteristics, and cancer outcomes. The outcome of interest was any complication within 30 days of surgery. Complications included wound infection, wound necrosis or disruption, seroma, drainage procedure, hematoma, and lymphedema. We performed multivariate logistic regression using SAS version 9.4. Results: We identified 139 patients having undergone 89 superficial, 12 deep, and 38 combined dissection types, respectively. Melanoma accounted for 84.9% of cases. Of these patients, 56.1% had an adverse postoperative event within 30 days. Increasing age (odds ratio [OR] 1.04, 95% confidence interval [CI] 1.01–1.07, p < 0.01) and number of positive lymph nodes harvested (OR 1.22, 95% CI 1.00–1.50, p = 0.05) were associated with more complications. Patients with deep dissection showed a lower likelihood of complications than those with superficial dissection (OR 0.15, 95% CI 0.03–0.84, p < 0.05). Conclusion: Complication rates after ILND remain high. We identified a number of risk factors, providing opportunities for better selection and prevention. Contexte: La lymphadénectomie inguinale (LI) a toujours été associée à une morbidité importante. Cette étude avait pour but de mesurer les taux de morbidité actuellement associés à la LI et d’en identifier les facteurs de risque potentiellement évitables. Méthodes: Nous avons procédé à une revue rétrospective des dossiers médicaux de tous les cas de curage inguinal superficiel, profond et complet effectués dans un seul centre hospitalier universitaire achalandé entre janvier 2007 et décembre 2020. Nous avons recueilli des données relatives aux caractéristiques des malades, des maladies et des chirurgies, de même que l’issue des cancers. Le paramètre principal était toute complication survenant dans les 30 jours suivant la chirurgie. Les complications incluaient infection, nécrose ou déhiscence de la plaie, sérome, pose de drain, hématome et lymphoedème. Nous avons procédé à une analyse de régression logistique multivariée à l’aide du logiciel SAS Enterprise 9.4. Résultats: Nous avons recensé 139 personnes ayant subi un curage inguinal: 89 superficiels, 12 profonds et 38 complets. Un mélanome justifiait l’intervention dans 84,9 % des cas. Parmi ces malades, 56,1 % ont eu une complication postopératoire dans les 30 jours suivants l’intervention. Un âge avancé (rapport des cotes [RC] 1,04, intervalle de confiance [IC] de 95 % 1,01–1,07, p < 0,01) et le nombre de ganglions lymphatiques positifs réséqués (RC 1,22, IC de 95 % 1,00–1,50, p = 0,05) ont été associés à plus de complications. Les curages profonds ont été associés à une probabilité moindre de complications comparativement aux curages superficiels (RC 0,15, IC de 95 % 0,03–0,84, p < 0,05). Conclusion: Les taux de complications suivant la lymphadénectomie inguinale restent élevés. Nous avons identifié certains facteurs de risque qui sont autant d’occasions de mieux sélectionner les malades et d’améliorer la prévention.


  • Open Access

    Content Quality of YouTube Videos About Metastatic Breast Cancer in Young Women: Systematic Assessment

    by Nina Morena, Yitzchok Ahisar, Xena Wang, Diana Nguyen, Carrie A Rentschler, Ari N Meguerditchian

    Background: Young women with metastatic breast cancer (MBC) are part of a digitally connected generation yet are underserved in terms of information needs. YouTube is widely used to find and identify health information. The accessibility of health-related content on social media together with the rare and marginalized experiences of young women with MBC and the digital media practices of younger generations imply a considerable likelihood that young women with MBC will seek information and community on the internet. Objective: This study aims to assess the content quality of MBC YouTube videos and to identify themes in the experiences of young women with MBC based on YouTube videos. Methods: A systematic assessment of MBC YouTube videos using the search term “metastatic breast cancer young” was conducted in August 2021. The search was performed in an incognito browser and with no associated YouTube or Google account. Search results were placed in order from most to least views. Title, date uploaded, length, poster identity, number of likes, and number of comments were collected. Understandability and actionability were assessed using the Patient Education Materials Assessment Tool (PEMAT); information reliability and quality were assessed with DISCERN. Themes, sponsorships, and health care professionals’ and patients’ narratives were reported. Results: A total of 101 videos were identified. Of these, 78.2% (n=79) included sponsorships. The mean PEMAT scores were 78.8% (SD 15.3%) and 43.1% (SD 45.2%) for understandability and actionability, respectively. The mean DISCERN score was 2.44 (SD 0.7) out of 5. Identified themes included treatment (n=67, 66.3%), family relationship (n=46, 45.5%), and motherhood (n=38, 37.6%). Conclusions: YouTube videos about young women with MBC are highly understandable but demonstrate moderate rates of actionability, with low reliability and quality scores. Many have a commercial bias. While web-based materials have limitations, their potential to provide patient support is not fully developed. By acknowledging their patients’ media habits, health care professionals can further develop a trusting bond with their patients, provide a space for open and honest discussions of web-based materials, and avoid any potential instances of confusion caused by misleading, inaccurate, or false web-based materials.


  • Open Access

    The Use of Web-Based Patient Reviews to Assess Medical Oncologists’ Competency: Mixed Methods Sequential Explanatory Study

    by Nina Morena, Nicholas Zelt, Diana Nguyen, Emilie Dionne, Carrie A Rentschler, Devon Greyson, Ari N Meguerditchian

    Background: Patients increasingly use web-based evaluation tools to assess their physicians, health care teams, and overall medical experience. Objective: This study aimed to evaluate the extent to which the standardized physician competencies of the CanMEDS Framework are present in web-based patient reviews (WPRs) and to identify patients’ perception of important physician qualities in the context of quality cancer care. Methods: The WPRs of all university-affiliated medical oncologists in midsized cities with medical schools in the province of Ontario (Canada) were collected. Two reviewers (1 communication studies researcher and 1 health care professional) independently assessed the WPRs according to the CanMEDS Framework and identified common themes. Comment scores were then evaluated to identify κ agreement rates between the reviewers, and a descriptive quantitative analysis of the cohort was completed. Following the quantitative analysis, an inductive thematic analysis was performed. Results: This study identified 49 actively practicing university-affiliated medical oncologists in midsized urban areas in Ontario. A total of 473 WPRs reviewing these 49 physicians were identified. Among the CanMEDS competencies, those defining the roles of medical experts, communicators, and professionals were the most prevalent (303/473, 64%; 182/473, 38%; and 129/473, 27%, respectively). Common themes in WPRs include medical skill and knowledge, interpersonal skills, and answering questions (from the patient to the physician). Detailed WPRs tend to include the following elements: experience and connection; discussion and evaluation of the physician’s knowledge, professionalism, interpersonal skills, and punctuality; in positive reviews, the expression of feelings of gratitude and a recommendation; and in negative reviews, discouragement from seeking the physician’s care. Patients’ perception of medical skills is less specific than their perception of interpersonal qualities, although medical skills are the most commented-on element of care in WPRs. Patients’ perception of interpersonal skills (listening, compassion, and overall caring demeanor) and other experiential phenomena, such as feeling rushed during appointments, is often specific and detailed. Details about a physician’s interpersonal skills or “bedside manner” are highly perceived, valued, and shareable in an WPR context. A small number of WPRs reflected a distinction between the value of medical skills and that of interpersonal skills. The authors of these WPRs claimed that for them, a physician’s medical skills and competence are more important than their interpersonal skills. Conclusions: CanMEDS roles and competencies that are explicitly patient facing (ie, those directly experienced by patients in their interactions with physicians and through the care that physicians provide) are the most likely to be present and reported on in WPRs. The findings demonstrate the opportunity to learn from WPRs, not simply to discern physicians’ popularity but to grasp what patients may expect from their physicians. In this context, WPRs can represent a method for the measurement and assessment of patient-facing physician competency.


  • Open Access

    Content Quality of YouTube Videos About Metastatic Breast Cancer in Young Women: Systematic Assessment (Preprint)

    by Nina Morena, Yitzchok Ahisar, Xena Wang, Diana Nguyen, Carrie A Rentschler, Ari N Meguerditchian

    BACKGROUND Young women with metastatic breast cancer (MBC) are part of a digitally connected generation yet are underserved in terms of information needs. YouTube is widely used to find and identify health information. The accessibility of health-related content on social media together with the rare and marginalized experiences of young women with MBC and the digital media practices of younger generations imply a considerable likelihood that young women with MBC will seek information and community on the internet. OBJECTIVE This study aims to assess the content quality of MBC YouTube videos and to identify themes in the experiences of young women with MBC based on YouTube videos. METHODS A systematic assessment of MBC YouTube videos using the search term “metastatic breast cancer young” was conducted in August 2021. The search was performed in an incognito browser and with no associated YouTube or Google account. Search results were placed in order from most to least views. Title, date uploaded, length, poster identity, number of likes, and number of comments were collected. Understandability and actionability were assessed using the Patient Education Materials Assessment Tool (PEMAT); information reliability and quality were assessed with DISCERN. Themes, sponsorships, and health care professionals’ and patients’ narratives were reported. RESULTS A total of 101 videos were identified. Of these, 78.2% (n=79) included sponsorships. The mean PEMAT scores were 78.8% (SD 15.3%) and 43.1% (SD 45.2%) for understandability and actionability, respectively. The mean DISCERN score was 2.44 (SD 0.7) out of 5. Identified themes included treatment (n=67, 66.3%), family relationship (n=46, 45.5%), and motherhood (n=38, 37.6%). CONCLUSIONS YouTube videos about young women with MBC are highly understandable but demonstrate moderate rates of actionability, with low reliability and quality scores. Many have a commercial bias. While web-based materials have limitations, their potential to provide patient support is not fully developed. By acknowledging their patients’ media habits, health care professionals can further develop a trusting bond with their patients, provide a space for open and honest discussions of web-based materials, and avoid any potential instances of confusion caused by misleading, inaccurate, or false web-based materials.

  • Open Access

    The Use of Web-Based Patient Reviews to Assess Medical Oncologists’ Competency: Mixed Methods Sequential Explanatory Study (Preprint)

    by Nina Morena, Nicholas Zelt, Diana Nguyen, Emilie Dionne, Carrie A Rentschler, Devon Greyson, Ari N Meguerditchian

    BACKGROUND Patients increasingly use web-based evaluation tools to assess their physicians, health care teams, and overall medical experience. OBJECTIVE This study aimed to evaluate the extent to which the standardized physician competencies of the CanMEDS Framework are present in web-based patient reviews (WPRs) and to identify patients’ perception of important physician qualities in the context of quality cancer care. METHODS The WPRs of all university-affiliated medical oncologists in midsized cities with medical schools in the province of Ontario (Canada) were collected. Two reviewers (1 communication studies researcher and 1 health care professional) independently assessed the WPRs according to the CanMEDS Framework and identified common themes. Comment scores were then evaluated to identify κ agreement rates between the reviewers, and a descriptive quantitative analysis of the cohort was completed. Following the quantitative analysis, an inductive thematic analysis was performed. RESULTS This study identified 49 actively practicing university-affiliated medical oncologists in midsized urban areas in Ontario. A total of 473 WPRs reviewing these 49 physicians were identified. Among the CanMEDS competencies, those defining the roles of medical experts, communicators, and professionals were the most prevalent (303/473, 64%; 182/473, 38%; and 129/473, 27%, respectively). Common themes in WPRs include medical skill and knowledge, interpersonal skills, and answering questions (from the patient to the physician). Detailed WPRs tend to include the following elements: experience and connection; discussion and evaluation of the physician’s knowledge, professionalism, interpersonal skills, and punctuality; in positive reviews, the expression of feelings of gratitude and a recommendation; and in negative reviews, discouragement from seeking the physician’s care. Patients’ perception of medical skills is less specific than their perception of interpersonal qualities, although medical skills are the most commented-on element of care in WPRs. Patients’ perception of interpersonal skills (listening, compassion, and overall caring demeanor) and other experiential phenomena, such as feeling rushed during appointments, is often specific and detailed. Details about a physician’s interpersonal skills or “bedside manner” are highly perceived, valued, and shareable in an WPR context. A small number of WPRs reflected a distinction between the value of medical skills and that of interpersonal skills. The authors of these WPRs claimed that for them, a physician’s medical skills and competence are more important than their interpersonal skills. CONCLUSIONS CanMEDS roles and competencies that are explicitly patient facing (ie, those directly experienced by patients in their interactions with physicians and through the care that physicians provide) are the most likely to be present and reported on in WPRs. The findings demonstrate the opportunity to learn from WPRs, not simply to discern physicians’ popularity but to grasp what patients may expect from their physicians. In this context, WPRs can represent a method for the measurement and assessment of patient-facing physician competency.

  • Spatially mapping the immune landscape of melanoma using imaging mass cytometry

    by Dan Moldoveanu, LeeAnn Ramsay, Mathieu Lajoie, Luke Anderson-Trocme, Marine Lingrand, Diana Berry, Lucas J.M. Perus, Yuhong Wei, Cleber Moraes, Rached Alkallas, et al.

    Melanoma is an immunogenic cancer with a high response rate to immune checkpoint inhibitors (ICIs). It harbors a high mutation burden compared with other cancers and, as a result, has abundant tumor-infiltrating lymphocytes (TILs) within its microenvironment. However, understanding the complex interplay between the stroma, tumor cells, and distinct TIL subsets remains a substantial challenge in immune oncology. To properly study this interplay, quantifying spatial relationships of multiple cell types within the tumor microenvironment is crucial. To address this, we used cytometry time-of-flight (CyTOF) imaging mass cytometry (IMC) to simultaneously quantify the expression of 35 protein markers, characterizing the microenvironment of 5 benign nevi and 67 melanomas. We profiled more than 220,000 individual cells to identify melanoma, lymphocyte subsets, macrophage/monocyte, and stromal cell populations, allowing for in-depth spatial quantification of the melanoma microenvironment. We found that within pretreatment melanomas, the abundance of proliferating antigen-experienced cytotoxic T cells (CD8 + CD45RO + Ki67 + ) and the proximity of antigen-experienced cytotoxic T cells to melanoma cells were associated with positive response to ICIs. Our study highlights the potential of multiplexed single-cell technology to quantify spatial cell-cell interactions within the tumor microenvironment to understand immune therapy responses.


  • Divergence from osteoporosis screening guidelines in older breast cancer patients treated with anti-estrogen therapy: A population-based cohort study

    by David Henault, Tracy Westley, Sinziana Dumitra, Sue-Ling Chang, Richard Kremer, Robyn Tamblyn, Nancy Mayo, Ari N. Meguerditchian


  • Patterns and predictors of emergency department visits among older patients after breast cancer surgery: A population-based cohort study

    by Tracy Westley, Ania Syrowatka, David Henault, Young-Soo Rho, Francois Khazoom, Sue-Ling Chang, Robyn Tamblyn, Nancy Mayo, Ari N. Meguerditchian