Table 1.

Definition of shock

	SHOCK trial	IABP-SHOCK II	European Society of Cardiology guidelines (2021)
Definition of Shock	—Clinical criteria: Myocardial infarction complicated by left ventricular dysfunction Systolic pressure < 90 mmHg for >30 min or support to maintain systolic pressure > 90 mmHg and end-organ hypo-perfusion (urine output < 30 mL/h or cold extremities) —Haemodynamic criteria: Cardiac index < 2.2 L/min/m2 and pulmonary capillary pressure > 15 mmHg	−Clinical criteria: Acute myocardial infarction Systolic blood pressure < 90 mmHg for >30 min or catecholamines to maintain systolic blood pressure > 90 mmHg and clinical pulmonary congestion and impaired end-organ perfusion (altered mental status, cold/clammy skin on limbs, urine output < 30 mL/h, or lactate > 2.0 mmol/L)	−Clinical criteria: Systolic blood pressure < 90 mmHg with adequate volume and clinical or laboratory signs of hypo-perfusion. —Clinical hypo-perfusion: Cold extremities, oliguria, mental confusion, dizziness, reduced pulse pressure —Laboratory hypo-perfusion: Metabolic acidosis, elevated serum lactate, elevated serum creatinine