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Table 3 Hemodynamic instability definition

From: Awake prone positioning in nonintubated spontaneous breathing ICU patients with acute hypoxemic respiratory failure (PRONELIFE)—protocol for a randomized clinical trial

Defined as any of the following not responding to fluid resuscitation:

• Systolic arterial pressure < 90 mmHg, or

• Mean arterial pressure < 65 mmHg, or

• Increased needs of vasopressor agents, or

• ECG evidence of ischemia or significant uncontrolled ventricular arrhythmia