1 From the Cardiology Section,, Medical Service, Long Beach Veterans Administration Hospital, and the University of California College of Medicine, Irvine, California.
One hundred normal subjects, mean age 51, who had had a simultaneous phonocardiogram and electrocardiogram at rest and after a double Master's test had a maximal treadmill stress test. Thirteen of 100 normal people (13%) had an abnormal maximal treadmill stress test with at least 1.0 mm of ischemic ST-segment depression. Ten of 29 normal subjects (34%) with a fourth heart sound and four of 11 normal people (36%) with a third heart sound after their double Master's test had an abnormal maximal treadmill stress test. Three of 71 normal subjects (4%) without a fourth heart sound and nine of 89 normal people (10%) without a third heart sound after their double Master's test had an abnormal maximal treadmill stress test. Normal subjects with an abnormal maximal treadmill stress test had a significantly higher incidence of fourth heart sounds (P <0.001) and third heart sounds (P <0.02) than normals with a normal maximal treadmill stress test.
Submitted on November 12, 1970
© 1971 American Heart Association, Inc.
Maximal Treadmill Stress Test Correlated with Postexercise Phonocardiogram in Normal Subjects
Key Words: Electrocardiography • Third heart sound • Exercise • Fourth heart sound • Treadmill • Phonocardiography
Accepted on February 26, 1971