The Fragmented QRS Complex in Lead V1: Time for an Update of the Athlete’s ECG?

• Published in: Journal of cardiovascular translational research Vol. 17; no. 1; pp. 24 - 32
• Main Authors: Vecchiato, Marco, Quinto, Giulia, Borasio, Nicola, Palermi, Stefano, Berton, Giampaolo, Battista, Francesca, Gasperetti, Andrea, Ermolao, Andrea, Neunhaeuserer, Daniel
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2024
• Subjects: Biomedical Engineering and Bioengineering; Biomedicine; Cardiology; Human Genetics; Medicine; Medicine & Public Health; Original; Original Article; Ventricular arrhythmias; Athlete’s heart; Exercise testing; Right ventricle; QRS fragmentation; Sports
• ISSN: 1937-5387; 1937-5395; 1937-5395
• DOI: 10.1007/s12265-023-10448-9

Differentiating between ECG patterns related to athletes' heart remodeling and pathological findings is a challenge in sports cardiology. As the significance of fragmented complex in athletes remains uncertain, this study aimed to assess the presence of fragmented QRS in lead V 1 (fQRSV 1 ) among young athletes and its association with heart adaptations and arrhythmias. Young athletes referred for annual pre-participation screening receiving a maximal exercise testing and transthoracic echocardiography from January 2015 to March 2021 were included. The study included 684 young athletes. The prevalence of fQRSV 1 was 33%. Subjects with fQRSV 1 had higher exercise capacity and indexes of right ventricular function and remodeling. Among highly trained athletes, the fQRSV 1 group demonstrated also increased left ventricular wall thickness. No significant association existed between fQRSV 1 and exercise-induced arrhythmias, even in highly trained athletes. The high prevalence of fQRSV 1 in young athletes is associated with training-induced heart adaptations but not exercise-induced ventricular arrhythmias. Graphical Abstract The fragmented QRS complex in lead V 1 in young athletes. PPS = preparticipation screening; EST = exercise stress test; fQRSV 1  = fragmented QRS in lead V 1 ; PSBs = premature supraventricular beats; PVBs = premature ventricular beats.