Myocardial oxygen demand depends upon-: (A) Preload, (B) Afterload, (C) Intramyocardial tension, (D) Blood Hb concentration
Answer is A. Ans. (a) Preload, B. Afterload, C. Intramyocardial tensionRef: Ganong, 25th ed/p.611Primary determinants of myocardial oxygen consumption are,#intramyocardial tension#contractile state of the myocardium#heart rate#Ventricular work (preload and afterload)-Ventricular work is the product of stroke and mean arterial pressure