Darren Nguyen

Dr. Darren Nguyen

orcid

Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Verified
Journal Article
Open access
PDF file
TSTaha Shaikh
Taha Shaikh
DNDarren Nguyen
Darren Nguyen
JDJasmine Kaur Dugal
Jasmine Kaur Dugal
MDMichael DiCaro
Michael DiCaro
BYBrianna Yee
Brianna Yee
ANAli Namazi
Ali Namazi
Arrhythmogenic right ventricular cardiomyopathy (ARVC) is characterized by structural abnormalities, arrhythmias, and a spectrum of genetic and clinical manifestations. Clinically, ARVC is structurally distinguished by right ventricular dilation due to increased adiposity and fibrosis in the ventricular walls, and it manifests as cardiac arrhythmias ranging from non-sustained ventricular tachycardia to sudden cardiac death. Its prevalence has been estimated to range from 1 in every 1000 to 5000 people, with its large range being attributed to the variability in genetic penetrance from asymptomatic to significant burden. It is even suggested that the prevalence is underestimated, as the presence of genotypic mutations does not always lead to clinical manifestations that would facilitate diagnosis. Additionally, while set criteria have been in place since the 1990s, newer understanding of this condition and advancements in cardiac technology have prompted multiple revisions in the diagnostic criteria for ARVC. Novel discoveries of gene variants predisposing patients to ARVC have led to established screening techniques while providing insight into genetic counseling and management. This review aims to provide an overview of the genetics, pathophysiology, and clinical approach to ARVC. It will also focus on clinical presentation, ARVC diagnostic criteria, electrophysiological findings, including electrocardiogram characteristics, and imaging findings from cardiac MRI, 2D, and 3D echocardiogram. Current management options—including anti-arrhythmic medications, device indications, and ablation techniques—and the effectiveness of treatment will also be reviewed.

Verified
Journal Article
Open access
PDF file
DNDarren Nguyen
Darren Nguyen
NRNoyan Ramazani
Noyan Ramazani
GSGurpreet Singh Sodhi
Gurpreet Singh Sodhi
TTTahir Tak
Tahir Tak
This review article aims to provide an overview of the pathophysiology, diagnosis, and contemporary management of cardiac amyloidosis (CA) as well as identify the knowledge gaps and areas of potential research. CA can be divided into two main groups: transthyretin cardiac amyloidosis (ATTR-CA) and light chain cardiac amyloidosis (AL-CA). The former further separates into wild-type transthyretin (ATTRwt) and hereditary transthyretin (ATTRv). African Americans, males, and people older than 75 are the most common demographics affected by this disease. Thanks to an increased understanding of this disease combined with better diagnostic techniques, there is growing awareness and a surge of clinical trials aimed at improving outcomes of CA. The diagnosis and treatment of CA is multifaceted and complex, relying on multiple imaging modalities and the cooperation of specialists to deliver effective treatments. While some disease-modifying agents have been introduced recently, their extraordinary cost limits their benefit or they are supported by limited evidence. Other agents are currently undergoing phase 3 trials. To date, there is scarce data surrounding optimal diagnostic and treatment strategies, including a potential role for combination therapies. Critically, it is imperative that physicians develop close relationships with the patient that addresses not only their individual health needs but also their unique psychosocial situation. Therefore, more clinical trials, protocols and patient resources are needed to better inform and guide providers managing these complex patient needs.

17 September 2025 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
MKMyung-Rho Kim
Myung-Rho Kim
TSTaha Shaikh
Taha Shaikh
STSpencer Taylor
Spencer Taylor
SWShawn Wang
Shawn Wang
DNDarren Nguyen
Darren Nguyen
KAVITA BatraKAVITA Batra
KAVITA Batra
Background/Objectives: Chronic aortic regurgitation (AR) can remain asymptomatic despite progressive myocardial damage. While current surgical guidelines rely heavily on left ventricular ejection fraction (LVEF) and symptoms, these measures may fail to detect subclinical myocardial dysfunction. Global longitudinal strain (GLS), a sensitive echocardiographic marker, has emerged as a potential early biomarker in valvular disease. Therefore, this systematic review aims to assess whether impaired GLS is significantly associated with adverse clinical outcomes including symptom onset, reduced LVEF, and the need for aortic valve intervention among patients with asymptomatic moderate to severe AR and preserved LVEF. Methods: This systematic review and meta-analysis followed PRISMA guidelines and was registered with PROSPERO (CRD42024579540). Comprehensive searches of PubMed, Embase, and the Cochrane Library were completed on November 28, 2024. Screening, deduplication, and blinding were conducted using Rayyan. Eligible studies included adults with chronic, asymptomatic moderate to severe AR and preserved LVEF who underwent GLS measurement. Risk of bias was assessed using the National Heart, Lung, and Blood Institute (NHLBI) tool. A random-effects meta-analysis was performed on studies reporting multivariate hazard ratios (HRs) and 95% confidence intervals. Results: Twelve studies (N = 3278) were included in the systematic review, and four studies (n = 1125) were eligible for meta-analysis. Impaired GLS was significantly associated with adverse outcomes, yielding a pooled HR of 1.359 (95% CI: 1.106–1.668; p = 0.003). Heterogeneity was substantial (I2 = 77%), and the 95% prediction interval ranged from 0.553 to 3.340, indicating potential variability in future settings. Conclusions: GLS is a promising prognostic biomarker for identifying subclinical cardiac dysfunction in asymptomatic moderate to severe AR with preserved LVEF. Its use may enhance early risk stratification and optimize timing for surgical intervention. Larger prospective studies are needed to validate specific GLS thresholds for clinical decision-making.

Verified
Journal Article
Open access
PDF file
AAAla Walid Abdallah
Ala Walid Abdallah
DNDarren Nguyen
Darren Nguyen
OOOsama Odeh
Osama Odeh
NRNoyan Ramazani
Noyan Ramazani
JCJaineet S. Chhabra
Jaineet S. Chhabra
TTTahir Tak
Tahir Tak
Background: Sudden cardiac death (SCD) and sudden cardiac arrest (SCA) remain leading causes of mortality in young athletes, highlighting the importance of cardiac screening prior to play. The guidelines on screening protocol are continually evolving but are often inconsistent across organizations. We explore the role of different screening modalities including electrocardiography (ECG) and various cardiac imaging testing; their effectiveness, cost considerations and clinical utility regarding sports cardiac screening, comparing European and American cardiac screening protocols. Additionally, we also discuss the divergence between the European and American guidelines and appraise the literature surrounding this topic. Methods: A comprehensive literature review was conducted using studies published between 2010–2025 on cardiac screening for young athletes. Parameters included an English filter with review of observational studies, systematic reviews, meta-analyses, and randomized controlled trials (RCTs). Manual searches of PubMed, Embase, and Google Scholar libraries were also performed to enhance the reach of our investigation. Articles were chosen based on relevance to the topic. Results: When compared to PPCS physical exam, ECG advantages include increased detection of cardiac conditions leading to SCD, improved sensitivity and specificity compared to history alone, Disadvantages are the need for trained specialists to complete testing properly, unreliability for detecting congenital coronary anomalies, cost-effectiveness concerns, and false positive risk. However, these disadvantages can be improved with improved ECG interpretation training for non-cardiologists and policies easing access to advanced cardiac care. Conclusions: ECG remains the cornerstone of cardiovascular screening due to its affordability and sensitivity in detecting electrical abnormalities, its limitations necessitate a multimodal approach. Integrating targeted ECG screening with echocardiography and advanced imaging in select cases may enhance diagnostic accuracy while balancing cost-effectiveness and accessibility. While the benefits of routine ECG are strongly supported by the literature, nationwide implementation of it remains challenging due to economic, geographical and logistical restraints. Therefore, more research needs to be conducted on the mortality benefits and cost-effectiveness of routine ECGs implementation in PPCS screening for young athletes.

19 October 2026 in Biomedicines
Verified
Journal Article
Open access
PDF file
MRMarc Ringor
Marc Ringor
DNDarren Nguyen
Darren Nguyen
FBFadel Boumelhem
Fadel Boumelhem
YJYousef Joseph
Yousef Joseph
DSDivyansh Sharma
Divyansh Sharma
JDJasmine Dugal
Jasmine Dugal
Heart transplantation (HT) remains a critical treatment for patients with end-stage heart failure who remain unresponsive to optimized guideline-directed medical therapy. This review examines recent advancements in pre-, peri-, and post-transplant screening and management aimed at improving patient selection, transplant accessibility, and clinical outcomes. Pre-transplant strategies include comprehensive HT candidate evaluation, risk stratification, donor selection, allocation policies that priotize critically ill patients, and mechanical circulatory support (MCS) to stabilize patients awaiting transplantation. Peri-transplant advances focus on strategies to maintain hemodynamic stability, minimize ischemic injury, and maintain graft viability immediately after HT. Post-transplant management emphasizes individualized immunosuppressive regimens, cardiac allograft rejection surveillance, and the prevention and management of complications to improve graft survival and long-term patient outcomes. Despite substantial progress, significant challenges remain, particularly the shortage of suitable donor organs and the risk of immune-mediated graft rejection. Emerging approaches, including artificial intelligence, xenotransplantation, and regenerative medicine, offer promising opportunities to expand the donor pool, enhance clinical decision-making, and improve HT outcomes. This review examines the research that influences the current policies and practices involved in HT, featuring the pivotal findings as well as any shortcomings present among these studies. Ultimately, continued research and multidisciplinary collaboration in each phase of HT are essential to improve the short and long-term health outcomes of transplant candidates. By integrating established evidence-based practices with emerging technologies, clinicians may further improve equitable access, survival, and quality-of-life for patients with end-stage heart failure.

25 December 2024 in Preprints.org
Verified
Preprint
Open access
PDF file
TSTaha Shaikh
Taha Shaikh
DNDarren Nguyen
Darren Nguyen
JDJasmine Kaur Dugal
Jasmine Kaur Dugal
MDMichael DiCaro
Michael DiCaro
BYBrianna Yee
Brianna Yee
ANAli Namazi
Ali Namazi
Although arrhythmogenic right ventricular cardiomyopathy (ARVC) has been a well-described entity, the condition still remains a growing topic in research. Clinically, ARVC is structurally distinguished by right ventricular dilation due to increased adiposity and fibrosis in the ventricular walls, and it manifests as cardiac arrhythmias ranging from nonsustained ventricular tachycardia to sudden cardiac death. Its prevalence has been estimated to range between 1 in every 1000-5000 people, with its large range being attributed to the variability in genetic penetrance from asymptomatic to significant burden. It is even suggested that the prevalence is underestimated, as the presence of genotypic mutations does not always lead to clinical manifestations that would facilitate diagnosis. Additionally, while set criteria have been in place since the 1990s, newer understanding of this condition and advancements in cardiac technology have prompted multiple revisions in the diagnostic criteria for ARVC. Known and newer discoveries of gene variants predisposing patients to ARVC have led to established screening techniques while providing insight into genetic counseling and management. This review will cover important information regarding the genetics and pathophysiology of ARVC. It will also focus on clinical presentation, ARVC diagnostic criteria, electrophysiological findings, including electrocardiogram characteristics, and imaging findings from cardiac MRI, 2D, and 3D echocardiogram. Current management options—including anti-arrhythmic medications, device indications, and ablation techniques—and the effectiveness of treatment will also be reviewed.