Relationship Between Shunt Size and Right Lead Electrocardiographic Findings in Patients with Secundum Atrial Septal Defect

Abstract

Objectives: Secundum atrial defect (ASDs) causes changing in cardiac hemodynamics dependent on the defect sizeand shunt volume including volume overload, stress extends to tissues in the cardiac conduction system and manifestsas intra-atrial or intra-ventricular conduction delay. The aim of the study is to evaluate that ECG findings in patients withatrial septal defect can help determine the shunt rate.Methods: This retrospective study included 74 patients with ASDs. Standard 12-lead ECG and right precordial electrocardiographicrecordings (V3R, V4R, V5R, and V6R) were obtained from all patients. QT intervals were measured manually fromECG on paper prints. According to shunt ratio (Qp/Qs), the patients divided into two groups as Group 2.Results: The mean ages of Group1 and Group2 were similar (p>0.05). There were no significant differences between thetwo groups between RA (right atrium) diameters, RV (right ventricle) diameter (p>0.05). V4RQTmax were 321.2±26.4msec; 351.1±33.6 msec, respectively (p