单选题 A priority nursing diagnosis during the first 24 hours following an MI is
A. Ineffective cardiac tissue perfusion.
B. Risk for infection.
C. Deficient fluid volume.
D. Constipation.

【正确答案】 A

【答案解析】Ineffective Cardiac Tissue Perfusion related to myocardial damage and inadequate cardiac output is a major problem immediately after a heart attack. Therapy is directed toward improving cardiac output and decreasing myocardial workload.