a mean ± standard deviation. b median (interquartile range). c median (lower and upper 95% confidence limit of median ).
Abbreviations: BUN, blood urea nitrogen; CPP, cerebral perfusion pressure; CVP, central venous pressure; HR, heart rate; ICP, intracranial pressure; MAP, mean arterial pressure; RCT, randomized controlled trails; SAH, subarachnoid hemorrhage; TBI, traumatic brain injury; VP, venous pressure.
Table 2 . Summaries of previous systematic review and meta-analysis.