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Which of the following ECG changes would be seen as a positive myocardial stress test response?
Correct Answer: C
Explanation/Reference: 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.