Which of the following phenomena would be most likely to accompany increased myocardial oxygen demand (MVO2)?
A)
Inadequate ventricular end-diastolic pressure
B)
Use of calcium channel blocker medications
C)
Increased aortic pressure
D)
Ventricular atrophy
Ans:
C
Feedback:
An increase in aortic pressure results in a rise in afterload, wall tension, and, ultimately, MVO2. Increased, not inadequate, ventricular end-diastolic pressure would cause an increase in MVO2, and medications such as calcium channel blockers would decrease MVO2. Hypertrophy of ventricles would occur in response to prolonged wall stress and consequent oxygen demand.
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