Exercise-induced QRS duration changes in patients with coronary artery disease-appearing "walkthrough" angina.
Two patients with coronary artery disease appearing as "walkthrough" angina underwent a treadmill exercise test. During the exercise, the patients appeared to have anginal pain associated with ST-segment depression and increased QRS duration. As the patients continued walking, anginal pain disappeared and a concomitant lessening in ST-segment depression and QRS prolongation was observed. Thus, the fact that the onset of angina was associated with ST-segment depression and prolonged QRS duration, while the disappearance of angina was associated with a decrease in ST-segment depression and QRS prolongation, is indicative of the effect of exercise-induced myocardial ischemia on QRS duration.
Michaelides
A P
AP
Department of Cardiology, University of Athens Medical School, Hippokration Hospital, Greece.
Psomadaki
Z D
ZD
Papas
K
K
Toutouzas
P K
PK
D000368:Aged; D000787:Angina Pectoris / Q000503:physiopathology*; D001794:Blood Pressure / Q000502:physiology; D003327:Coronary Disease / Q000175:diagnosis / Q000503:physiopathology*; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000175:diagnosis / Q000503:physiopathology; D005082:Physical Exertion / Q000502:physiology*; D013997:Time Factors; D016138:Walking / Q000502:physiology