True about cardiac O2 demand is-: (A) Directly proportional to mean arterial pressure, (B) Inversely proportional to heart rate, (C) Inversely proportional to cardiac work, (D) Has a constant relation to the external work done by the heart
Answer is A. Ans. (a) Directly proportional to mean arterial pressureRef: Ganong, 25th ed/p.612Myocardial oxygen consumption is directly proportional to mean arterial pressure