NEJM This Week — November 20, 2025

This week, we look at new research on potassium optimization in patients with defibrillators, reducing antihypertensive therapy in nursing homes, an mRNA influenza vaccine, and belzutifan for rare neuroendocrine tumors. We review long QT syndrome and present a case of abnormal behavior and seizures in a young man. We also explore perspectives on primary care reform, tobacco cessation in HIV and tuberculosis care, corporate control in health care, and the simple power of compassion with ice cream.