From Syndrome to Disease: Reconsidering Heart Failure Through the 2026 Universal Definition and ICD-10/ICD-11
Heart failure remains one of the central clinical realities of cardiovascular medicine. The recent 2026 AHA/ACC/ESC/WHF Expert Consensus Document, Second Universal Definition of Heart Failure , defines heart failure as a clinical syndrome with diverse causes, recognized through a combination of symptoms, signs, biomarkers, imaging, and structural or functional cardiac abnormalities. This is correct and clinically useful. Yet this definition does not fully exhaust the nature of heart failure across its entire course. There is an important distinction between the origin of heart failure and its later clinical status. Heart failure may initially arise as a syndrome of ischemic heart disease, hypertension, valvular pathology, cardiomyopathy, arrhythmia, pulmonary disease, renal disease, or systemic disorders. In this sense, it is indeed secondary. However, at later stages heart failure often becomes the principal determinant of the patient’s health, symptoms, functional capacity, repe...