A consensus statement reflects numerous studies suggesting the harms of even brief episodes of intraoperative hypotension. There is strong associations between hypotension and myocardial injury and infarction, renal injury, and death.
The consensus defines significantly harmful levels as systolic < 100, or mean arterial pressure < 60 – 70mm Hg in noncardiac surgery. Upper levels of 160 (or 140 in cardiac surgery) increase the risks.
Some of the studies showing the harms of hypotension previously published: