Final answer:
The nurse should monitor for hyperkalemia as an adverse effect of enalapril in a client with heart failure.
Explanation:
Hyperkalemia is the adverse effect the nurse should monitor for in a client receiving enalapril for heart failure. Enalapril, an ACE inhibitor, can lead to elevated potassium levels, potentially causing weakness, fatigue, and even heart arrhythmias due to the impact on the renin-angiotensin system.
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