The nurse is caring for a client with an acute myocardial infarction. The nurse understands that this condition results in cardiogenic shock by which mechanism?
A) Increased coronary perfusion pressure
B) Increased left ventricular pressure
C) Increased myocardial contractility
D) Increased cardiac output
B) Increased left ventricular pressure
Explanation: A) Increased coronary perfusion pressure, myocardial contractility, and cardiac output are not part of the mechanisms leading to cardiogenic shock due to myocardial infarction.
B) Cardiogenic shock caused by acute myocardial infarction shows a progressive decrease in coronary perfusion pressure, increased myocardial oxygen demand, and hypoxia. This cycle contributes to a decrease in myocardial contractility and stroke volume and an increase in end-systolic volume. The weak heart pumps less blood, and the pressure increases in the left ventricle, causing an increase in pulmonary pressure and pulmonary edema.
C) Increased coronary perfusion pressure, myocardial contractility, and cardiac output are not part of the mechanisms leading to cardiogenic shock due to myocardial infarction.
D) Increased coronary perfusion pressure, myocardial contractility, and cardiac output are not part of the mechanisms leading to cardiogenic shock due to myocardial infarction.
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