AI Article Synopsis
Article Abstract
Unlabelled: Previous studies have shown that two linked polymorphisms within regulatory regions of the gene for connexin40 (Cx40), at nucleotides -44 (G --> A) and +71 (A --> G) occur in about 7% of the general population. Cx40 is abundant in the atrium, and homozygosity for the linked polymorphisms combined with an SCN5A mutation appeared to be responsible for familial atrial standstill. We hypothesized that these polymorphisms are associated with the atrial electrophysiologic substrate favoring reentrant mechanisms for initiation of atrial fibrillation (AF). Reentry is promoted by spatial dispersion of refractoriness that can be expressed as a coefficient of dispersion (CD).
Methods: CD was calculated from the standard deviation of 12 local mean fibrillatory intervals recorded at right atrial sites during induced AF in 30 patients without structural heart disease (14 sporadic AF episodes, 16 no AF history). CD
Results: Mean CD in AF patients was 5.96 +/- 0.70 and without AF 1.59 +/- 0.18 (p < 0.001). Thirteen of fourteen patients with AF had enhanced CD. Carriers of -44 AA genotype had higher CD compared with those with -44 GG genotype (6.37 +/- 1.21 vs. 2.38 +/- 0.39, p = 0.018), whereas heterozygotes showed intermediate values (3.95 +/- 1.38, NS).
Conclusion: The rare linked Cx40 polymorphisms are associated with enhanced CD and thus with the substrate for reentry in AF.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1159/000092579 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
How to Prevent Arrhythmias Following Acute Coronary Syndrome.
Clin Cardiol
January 2025
Second Department of Internal Medicine, University of Toyama, Toyama, Japan.
Comorbidity patterns and mortality in atrial fibrillation: a latent class analysis of the EURopean study of Older Subjects with Atrial Fibrillation (EUROSAF).
Ann Med
December 2025
Department of Clinical Pharmacology, Flinders Medical Centre, Southern Adelaide Local Health Network, Adelaide, Australia.
Background: Most older patients with atrial fibrillation (AF) have comorbidities. However, it is unclear whether specific comorbidity patterns are associated with adverse outcomes. We identified comorbidity patterns and their association with mortality in multimorbid older AF patients with different multidimensional frailty.
View Article and Find Full Text PDFAssociation Between Serum Levels of Sestrin-2 and Galectin-3 and Atrial Remodelling in Patients with Atrial Fibrillation.
J Coll Physicians Surg Pak
January 2025
Department of Cardiovascular Medicine, Second People's Hospital of Anhui Province, Hefei, China.
Objective: To explore the prognostic significance of Sestrin-2 and Galectin-3 levels in atrial fibrillation complicated by left atrial remodelling, aiming to offer novel insights for prevention, treatment, and follow-up strategies.
Study Design: Analytical study. Place and Duration of the Study: Department of Cardiology, Second People's Hospital of Anhui Province, Hefei, China, from January 2021 to December 2023.
Risk factors for long-term severe tricuspid regurgitation following mitral valve replacement: a retrospective study.
BMC Cardiovasc Disord
January 2025
Department of Cardiology, Xuzhou Central Hospital, No.199 Jiefang South Road, Quanshan District, Xuzhou, 221009, People's Republic of China.
Background: The aim of this study is to identify factors associated with the development of long-term severe tricuspid regurgitation (TR) following mitral valve replacement (MVR).
Methods: A retrospective analysis was conducted involving 308 patients who underwent single-valve MVR at Xuzhou Central Hospital between April 2017 and December 2022. Preoperative color Doppler ultrasound indicated that all patients had either no or mild to moderate tricuspid regurgitation.
Difficult airway management in a patient with severe mitral and tricuspid regurgitation, rapid atrial fibrillation, and moderate pulmonary hypertension: a case report.
BMC Anesthesiol
January 2025
Department of Anaesthesiology, West China Hospital, Sichuan University & The Research Units of West China (2018RU012), Chinese Academy of Medical Sciences, Chengdu, 610041, China.
Background: Given the prevalence of cardiovascular disease, encountering difficult airways in this patient population is quite common. The challenge for anesthesiologists lies not only in establishing the airway but also in managing the hemodynamic instability caused by sympathetic activation during intubation. The purpose of this report is to describe the anesthetic experience of this patient with severe mitral and tricuspid regurgitation, atrial fibrillation with rapid ventricular response, and moderate pulmonary hypertension with an anticipated difficult airway.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!