Angiotensin-converting enzyme inhibitors (ACEIs), angiotensin receptor blockers (ARBs), b-adrenergic receptor blockers (BBs), and aldosterone blockers (ABs) have been shown to be effective in reducing cardiovascular mortality and the need for hospitalizations for heart failure (HF) in patients with chronic HF and a reduced left ventricular ejection fraction (HFREF) and in patients with HFREF po...