A client reports substernal chest pain. Test results show electrocardiograph changes and an elevated cardiac troponin level. Which of the following should be the focus of nursing care（）
A. Improving myocardial oxygenation and reducing cardiac workload.
B. Confirming a suspected diagnosis and preventing complications.
C. Reducing anxiety and relieving pain.
D. Eliminating stressors and providing a nondemanding environment.
参考答案：A
解析：
The client is exhibiting clinical signs and symptoms of a myocardial infarction (MI); therefore, nursing care should focus on improving myocardial oxygenation and reducing cardiac workload. Confirming the diagnosis of MI and preventing complications, reducing anxiety and relieving pain, and providing a nondemanding environment are secondary to improving myocardial oxygenation and reducing workload. Stressors can’t be eliminated, only reduced.