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Table 1 Killip classification

From: Blood lactate is a predictor of short-term mortality in patients with myocardial infarction complicated by heart failure but without cardiogenic shock

Killip class I: Individuals with no clinical signs of heart failure.
Killip class II: Individuals with rales or crackles in the lungs, an S3, and elevated jugular venous pressure.
Killip class III: Individuals with frank acute pulmonary edema.
Killip class IV: Individuals in cardiogenic shock or hypotension (measured as systolic blood pressure lower than 90 mmHg) and evidence of peripheral vasoconstriction (oliguria, cyanosis or sweating).