EVALUATION OF THE T-WAVE DURING EXERCISE-TESTING IN PATIENTS WITH IDIOPATHIC DILATED CARDIOMYOPATHY (DCM) WITH AND WITHOUT BETA-BLOCKADES

摘要

Exercise-induced ventricular arrhythmias are frequently observed in patients with DCM, and it may be concerned with the loss of T-wave uniformity during exercise. In this study, T-wave height (TH) and recovery time (RT) were evaluated in the DCM patients. Treadmill testing was performed in the 19 normal and 15 DCM patients. At rest and 1 minute after the peak exercise, average TH in the V5 and V6 leads (mV) and dispersion of the RT in the VI to V6 leads (RTd; ms) were evaluated. In the DCM patients, data were obtained before and after beta-blockade treatment. In all cases, TH was increased and RTd decreased after exercise, but TH was smaller and RTd was greater in the DCM patients both before and after exercise. After beta-blockade treatment, TH was increased and RTd decreased in the DCM patients, compared to those from the first testing. T-wave uniformity after exercise was impaired in the DCM patients but was recovered by beta-blockade.