When is a beta blocker given in heart failure?

• A. Only during acute decompensation
• B. Along with an ACEi or ARB/ARNi to reduce remodeling and mortality
• C. Before ACE inhibitors
• D. Only after diuretics

Answer: (B)

Beta blockers are added as part of guideline-directed medical therapy for chronic heart failure with reduced ejection fraction to blunt the harmful effects of persistent sympathetic activation, slow or reverse remodeling, and reduce mortality. They are started after the patient is clinically stable and euvolemic, not during an acute decompensation, because initiating in a decompensated state can worsen symptoms or cause hypotension. The best approach is to begin a beta blocker once other therapies, particularly a renin–angiotensin system blocker (ACE inhibitor, ARB, or ARNi), have been started and the patient can tolerate stable blood pressure and heart rate. This combination—beta blocker plus RAS blockade—provides a greater mortality and remodeling benefit than either agent alone. Diuretics help relieve congestion and symptoms but do not confer the same long-term survival benefit, which is why timing after optimization of neurohormonal blockade is emphasized rather than “only after diuretics.”