Questioning Medicine

Packer M et al. Tirzepatide for heart failure with preserved ejection fraction and obesity. N Engl J Med 2024 Nov 16; [e-pub].https://doi.org/10.1056/NEJMoa2410027  In the industry-funded SUMMIT trial (NCT04847557), investigators examined cardiovascular outcomes of tirzepatide — an agonist of glucose-dependent insulinotropic polypeptide (GIP) and GLP-1 receptors — over a longer period in patients with HFpEF and obesity.  The 731 study participants had elevated filling pressures or an elevated N-terminal pro–B-type natriuretic peptide (NT-proBNP) level, and a heart failure exacerbation event within the prior 12 months or a decreased estimated glomerular filtration rate <70 mL/min/1.73 m2. They were randomized to once-weekly subcutaneous tirzepatide (up to 15 mg) or placebo for at least 52 weeks with a median follow-up of 104 weeks.Compared with placebo, tirzepatide resulted in significantly fewer primary-endpoint events (adjudicated heart-failure worsening or cardiovascular death) — 10% vs. 15% (hazard rati