What do systematic reviews say?

Active body surface warming systems vs control

Active body surface warming systems showed no clear difference in all‐cause mortality compared with control (low certainty).

• Active body surface warming systems for preventing complications caused by inadvertent perioperative hypothermia in… 2016 · Cochrane Headline outcomes only
  RR 1.01 [0.26, 4]
  2 studies · 500 participants
  Low