A client is admitted with heart failure (HF) and left ventricular hypertrophy. Which intervention is most likely to avert development of cardiomegaly and improve myocardial contractility?

Rationale: A. Maintain continuous monitoring of heart rate and rhythm: Continuous monitoring helps detect dysrhythmias early but does not prevent the structural changes of cardiomegaly or directly improve myocardial contractility. B. Teach about compliance to reduce blood pressure: Controlling hypertension reduces the workload on the left ventricle, preventing further hypertrophy and promoting optimal myocardial function. Patient adherence to antihypertensive therapy is crucial in averting cardiomegaly and improving contractility over time. C. Administer nitroglycerin daily: Nitroglycerin primarily reduces preload and relieves angina. It does not directly prevent ventricular hypertrophy or significantly enhance contractility in heart failure patients. D. Provide rest periods and portable oxygen: Rest and supplemental oxygen reduce oxygen demand and alleviate symptoms but do not prevent structural remodeling of the heart or improve contractility.