The staff educator is teaching a class for new nurses on the cardiac unit. The educator lists the causes of a myocardial infarction. What causes of an MI would the educator list? (Mark all that apply.)
A) Ingestion of cocaine
B) Low blood pressure
C) Adrenal storm
D) Thyrotoxicosis
E) Vasospasm
Ans: A, B, D, E
Feedback: In an MI, an area of the myocardium is permanently destroyed, typically because plaque rupture and subsequent thrombus formation result in complete occlusion of the artery. Vasospasm (sudden constriction or narrowing) of a coronary artery, decreased oxygen supply (eg, from acute blood loss, anemia, or low blood pressure), and increased demand for oxygen (eg, from a rapid heart rate, thyrotoxicosis, or ingestion of cocaine) are other causes of MI. In each case, a profound imbalance exists between myocardial oxygen supply and demand. Adrenal storm is not a cause for a myocardial infarction.
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