Table 1.

Predetermined safety limits during head-up tilt

Absolute	Systolic/Diastolic BP	>80/50 mm Hg
	CPP	>50 mm Hg
	HR	<180 bpm
	ICP	<25 mm Hg
Relative	Permitted decrease from baseline systolic/diastolic BP	<30/15 mm Hg
	Permitted increase in HR from baseline	<30 bpm

Abbreviations: BP blood pressure, CPP cerebral perfusion pressure, HR heart rate, ICP intracranial pressure