Document Type : Original Article(s)

Authors

1 Assistant Professor of Cardiology, Vascular and Endovascular Surgery Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

2 Associate Professor of Cardiology, Vascular and Endovascular Surgery Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

3 Professor, Department of Cardiology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

4 Assistant Professor of Community Medicine, Clinical Research Development Unit, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran

5 Echocardiologist, Mashhad University of Medical Sciences, Mashhad, Iran

6 Resident of Internal Medicine, Department of Internal Medicine, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

Abstract

BACKGROUND: Premature ventricular contractions (PVCs) are early depolarizations of the myocardium which originate from the ventricle. PVCs have previously been considered a benign condition. The clinical significance of PVCs in patients without structural heart disease is controversial.
METHODS: In this cross-sectional study, patients with a palpitation complaint who underwent electrocardiography (ECG) Holter recording for 48 hours were analyzed. Patients with frequent PVCs (more than ten times in 1 hour) were identified and enrolled in the study. 26 patients were in the PVC group, and 26 patients were in the control group without PVC. The identified patients underwent an echocardiographic examination with strain modality.
RESULTS: There were 15 women (57.7%) in the PVC group and 17 women (65.4%) in the control group (P = 0.57). Two patients in the PVC group and three patients in the control group were hypertensive (P > 0.99). There was only one patient with diabetes in PVC and control group (P > 0.99). There were two smokers in the PVC group, whereas there was no smoker in the control group (P = 0.49). In comparison between two groups, patients with frequent PVCs had significantly larger left ventricular end-diastolic volume index (LVEDVI) (P = 0.048) along with lower left ventricular ejection fraction (LVEF) (P = 0.011), lower (more positive) left ventricular global longitudinal strain (LVGLS) (P = 0.001), and lower peak systolic mitral annular velocity (S') (P = 0.045). The left atrial volume index (LAVI) was significantly larger in the PVC group (P = 0.001). In speckle tracking echocardiography (STE) parameters, global peak atrial longitudinal strain (PALS) (P = 0.001) and peak atrial contraction strain (PACS) (P = 0.001) were significantly lower and time to peak longitudinal strain (TPLS) (P = 0.002) was significantly higher in the PVC group.
CONCLUSION: In this study, left atrial (LA) and left ventricular (LV) function and geometry were adversely affected by frequent PVCs. Early diagnosis of these effects is possible with echocardiography along with strain analysis. It can guide the timely treatment of PVC to avoid the harmful effects of frequent PVCs on the heart.

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