Prognostic importance of physical examination for heart failure in non-ST-elevation acute coronary syndromes: the enduring value of Killip classification

The Killip classification system can accurately predict which patients with a non-ST-segment heart attack may die within the following year, according to a study of 26,090 patients. Those in Killip class 3 or 4 had higher 30-day and six-month death rates than those in Killip class 1 or 2. The Killip classification is used to indicate a patient's degree of heart failure. Killip 1 or 2 indicates no heart failure or mild heart failure and Killip 3 or 4 indicates moderate to severe heart failure.