How do you treat acute hypothermia?

Please see below.: Treatment includes preventing further heat loss, then careful rewarming, as well as respiratory support. Hypothermia can cause heart rhythm problems, which can require medication, cpr, or a defibrillator.

Depends on severity: The most severe cases, especially in alpine nations with mountaineers, will get bypass even after their heart has been stopped for hours. They have surprising decent outcomes. The easiest invasive techniques involve washing out easilly accesible body cavities with warm saline, such as the bladder, the stomach, the pleura (space around lung) and the peritoneum. Otherwise warm fluids, baird hugger.