Diagnostic Value Of QT Dispersion For Coronary Artery Disease In Cardiac Stress Test By Transesophageal Atrial Pacing

Objective: To investigate the changes and diagnostic value of QT dispersion (QTd) for patients with coronary artery disease during cardiac stress testing (CST) by transesophageal atrial pacing (TEAP). Methods: Forty two consecutive inpatients underwent CST by TEAP firstly, then accepted selective coronary atreriography (SCA) by Judkins method. Patients were divided into two groups according the results of SCA, i.e. 24 cases in coronary artery disease group (CAD) and 18 cases with normal coronary artery (NCA). Measurements of QTd in two groups before and after CST were analyzed in and between groups. Applying the results of SCA as the golden standard, we compared the diagnostic efficiency for CAD between ST-segment depression~O.1mV criteria and QTd~6Oms criteria. Results: CAD group had a higher QTd than NCA group at baseline or every stages after CST (PO.05, 3 respectively),but each subgroup had a greater QTd immediately or 2mm after CST than that before(P