Abstract 14465: Prevalence of J-wave Pattern at Standard Ecg in the General Population.
Background: Recent studies suggested that a J-wave at ECG is associated with an increased risk of ventricular tachyarrhythmias. However, the exact prevalence of J-wave and its association with clinical features in the general population remains poorly known.
Methods: All 5,026 ambulatory subjects (age 54.2±18.0, 45% males) who underwent standard ECG recording at our Center from Dec 2009 to May 2010 were included in this study. Clinical details, including history of cardiovascular disease, syncope, arrhythmia, chest pain, dyspnea, cardiovascular risk factors and therapy, were obtained from each subject. J-wave was defined as a notched or slurred positive deflection of at least 0.1 mV of amplitude in the terminal part of QRS, measured at its highest point in any lead other than aVR and V1-V3.
Results: J-wave was detected in 1,150 patients (22,9%), 645 (12.8%) with a notched and 505 (10,1%) with a slurred morphology. J-wave was detected in inferior (II-III-aVF), lateral (I-aVL) and left precordial (V4-V6) leads in 15.4%, 8.7% and 7.5% of subjects, respectively. The prevalence of J-wave was higher in the second decade of life and progressively decreased thereafter (p<0.001). Compared to subjects without J-wave, those with J-wave were younger (52.1±17 vs. 54.9±18 years, p<0.001). Furthermore, J-wave was more frequent in men vs. women (25.7% vs. 20.5%, p<0.001) and in smokers vs. non smokers (27.5% vs 21.8%, p=0.001). A history of arrhythmia or use of anti-arrhythmic drugs was less frequent in subjects with than in those without J-wave (figure). No differences were found in other main clinical variables between patients with or without J-wave.
Conclusions: J-wave at standard ECG can be detected in a sizeable proportion of unselected subjects, particularly in younger ages and does not seem to be associated with a history or symptoms of arrhythmia. Our data suggest that J-wave at routine ECG should be considered as a normal finding.
- © 2010 by American Heart Association, Inc.