A patient was admitted to the intensive care unit with a diagnosis of acute myocardial infarction (MI) and is being treated for shock. The primary cause of shock is most likely:
a. rapid heart rate.
b. decreased cardiac contractility.
c. increased capillary permeability.
d. decreased afterload due to vasodilation.
ANS: B
MI leads to decreased cardiac contractility due to a damaged myocardium and would lead to shock. A rapid heart rate would not cause shock. Increased capillary permeability would not lead to shock. Decreased afterload will not lead to shock associated with MI.
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