Final answer:
The best nursing assessment following the initial administration of enalapril (Vasotec) for heart failure is to assess the patient's blood pressure.
Step-by-step explanation:
Following the initial administration of enalapril (Vasotec) for heart failure, the best nursing assessment would be to assess the patient's blood pressure. Enalapril is an angiotensin-converting enzyme (ACE) inhibitor, which works by blocking the conversion of angiotensin I to angiotensin II, resulting in vasodilation and a decrease in blood pressure. Monitoring the patient's blood pressure will help determine if the medication is effectively controlling their hypertension and heart failure.