NYHA Class IV: Definition, Clinical Context, and Cardiology Overview
NYHA Class IV is the most severe category in the New York Heart Association (NYHA) functional classification for heart failure symptoms. It describes people who have symptoms at rest and are unable to carry out any physical activity without discomfort. It is a symptom-based clinical classification, not a single test result or diagnosis. It is commonly encountered in heart failure clinics, inpatient cardiology, and discussions about advanced therapies and prognosis.