There is a need for standardized reporting of intraoperative hypotension, ideally using absolute values such as MAP < 60-70 mmHg or SBP < 100 mmHg along with the number of hypotensive epochs or time-weighted duration.
Most studies defined IOH by absolute or relative changes from baseline values. There are substantial inconsistencies in how IOH was reported. Further, definitions differed across different surgical specialities. Our findings further suggest that IOH should be defined using the absolute values stated in the POQI statement i.e., MAP < 60-70 mmHg or SBP < 100 mmHg. Finally, the number of hypotensive epochs or time-weighted duration of IOH should also be reported.
Weinberg et al. (2022) studied this question.