A Patient Has Heart Failure

A patient has heart failure.A recent echocardiogram reveals decreased compliance of the left ventricle and poor ventricular filling.The patient takes low-dose furosemide and an ACE inhibitor.The primary care NP sees the patient for a routine physical examination and notes a heart rate of 92 beats per minute and a blood pressure of 100/60 mm Hg.The NP should:

A) order serum electrolytes.
B) obtain renal function tests.
C) consider prescribing a β-blocker.
D) call the patient's cardiologist to discuss adding digoxin to the patient's regimen.