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Title: Fragmented QRS complex on ECG is associated with ventricular arrhythmias in patients with a prior myocardial infarction
Author(s): L. Ma , S. Ma , J. Lv , Y. Zhang , Z. Liu , P. Bu , Z. Li , L. Wang
Journal: Acta Cardiologica
Volume: 71    Issue: 6   Date: 2016   
Pages: 671-677
DOI: 10.2143/AC.71.6.3178185

Abstract :
Objective: The aim of this study was to investigate the relations between fragmented QRS complex (fQRS) on ECG and the incidence of ventricular arrhythmias in patients with a prior myocardial infarction (MI).
Methods: A total of 321 patients with MI were divided into the fQRS (n = 167) and non-fQRS group (n = 154). Standard 12-lead ECG and 24-h Holter monitoring were performed in all patients.
Results: The incidence of frequent (28.7% vs 17.5%, P < 0.05) or high-risk ventricular premature contractions (34.1% vs 23.4%, P < 0.05) in the fQRS group was higher than in the non-fQRS group. The incidence of non-sustained ventricular tachycardia in the fQRS group was also higher than in the non-fQRS group (12.0% vs 4.5%, P < 0.05). Patients with a fQRS duration of > 0.12 s had a higher incidence of ventricular arrhythmias (70.6%) than patients with fQRS duration between 0.101 and 0.119 s (42.6%, P < 0.05), or those with fQRS duration of 0.10 s or less (22.9%, P < 0.05). Logistic regression analysis showed that fQRS was an independent predictor for high-risk ventricular premature contractions (OR, 1.482, 95% CI, 1.19-3.22, P = 0.02), or non-sustained ventricular tachycardia (OR, 1.982, 95% CI, 1.30-3.76, P = 0.01).
Conclusion: fQRS was associated with an increased incidence of high-risk ventricular premature contractions and non-sustained ventricular tachycardia. fQRS may be used to predict future risk of ventricular arrhythmias in patients with a prior myocardial infarction.

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