Which of the following ECG changes would be seen as a positive myocardial stress test response?
A . Hyperacute T wave
B . Prolongation of the PR interval
C . ST-segment depression
D . Pathological Q wave
Answer: C
Explanation:
(A) Hyperacute T waves occur with hyperkalemia.
(B) Prolongation of the P R interval occurs with first-degree AV block.
(C) Horizontal ST-segment depression of>1 mm during exercise isdefinitely a positive criterion on the exercise ECG test.
(D) Patho-logical Q waves occur with MI.