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Which of the following is NOT a determinant of myocardial oxygen supply?
A. Heart rate
B. Hemoglobin
C. LVEDP
D. Afterload
Answer
The answer is D. Afterload, in itself is a deteminant of myocardial oxygen demand. Diastolic blood pressure, not afterload (they are not the same) is a determinant of myocardial oxygen supply. The other determinants of myocardial oxygen supply are cardiac output (HR x SV), oxygen content, coronary perfusion pressure (DBP-LVEDP), heart rate, and wall tension. This question is courtesy of Yaster and in preparation of the oral boards in the spring.
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