If the ST segment drops 3 mm during exercise,it is evidence of
A)old MI.
B)myocardial ischemia.
C)J-point elevation.
D)ventricular tachycardia.

Question

Quizplus · Accepted Answer

A drop of 1 mm or more in the ST segment during exercise is considered abnormal and suggests myocardial ischemia, which occurs when the heart muscle doesn't get enough oxygen-rich blood. A significant ST segment drop of 3 mm is even more indicative of ischemia. Old MI would show up as a Q wave on an ECG, while J-point elevation would cause the ST segment to elevate, not drop. Ventricular tachycardia would appear as a rapid, abnormal heartbeat on an ECG, and would not necessarily cause the ST segment to drop.

If the ST Segment Drops 3 Mm During Exercise,it Is