Classification Systems for Heart Failure and Angina

Overview of NYHA and CCS Classification Systems

The American College of Cardiology and the Canadian Cardiovascular Society recommend using the NYHA classification system to grade functional limitation from heart failure symptoms, and the CCS classification system to grade angina severity, as these are fundamentally different systems for different cardiac conditions 1

The American College of Cardiology recommends assessing functional capacity in patients with heart failure using the NYHA system, which is based on symptom severity during physical activity 2
The NYHA classification system has four classes: Class I (no limitation of physical activity), Class II (slight limitation of ordinary activity), Class III (marked limitation of physical activity), and Class IV (inability to carry on any physical activity without discomfort) 1, 4
The American Heart Association notes that the NYHA classification is subjective, determined by clinician assessment, and can change frequently over short periods in response to treatment or disease progression 3

The Canadian Cardiovascular Society recommends using the CCS grading scale to assess angina pectoris or anginal equivalent symptoms, with four classes: Class I (ordinary physical activity does not cause angina), Class II (slight limitation of ordinary activity), Class III (marked limitation of ordinary physical activity), and Class IV (inability to perform any physical activity without discomfort) 1

The American College of Cardiology recommends specifying both ACC/AHA stage and NYHA class for heart failure patients, as they provide complementary information about disease progression and current symptom burden 2
The American College of Cardiology recommends using the CCS classification system to determine the urgency and type of intervention for angina patients, with unstable angina requiring immediate evaluation for acute coronary syndrome 1
The American Heart Association notes that all patients with HFrEF should receive guideline-directed medical therapy (ACE inhibitors/ARBs, beta-blockers, mineralocorticoid receptor antagonists) regardless of NYHA class 3