Table 1 Killip classification

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).