Pharmacologic therapies for hypothermia are ineffective below which core temperatures?

Pharmacologic therapies for hypothermia are ineffective below which core temperatures?

• A. Below 30–32 C
• B. Below 20 C
• C. Above 40 C
• D. At all temperatures

Answer: (A)

Drug effectiveness in hypothermia depends on temperature’s effect on metabolism and circulation. As the core temperature falls toward 30°C–32°C, enzymatic activity slows, cardiac output and tissue perfusion decrease, and receptor signaling becomes blunted. In this state, medications used for rewarming and resuscitation—vasopressors, antiarrhythmics, sedatives, analgesics—do not produce reliable effects. Therefore, pharmacologic therapies are ineffective below roughly 30–32°C, and the focus should be on active warming to raise the core temperature to a range where drug responses are predictable. The other options don’t fit, since drug therapies can work at normal temperatures and aren’t limited to all temperatures or only below 40°C.

Drug effectiveness in hypothermia depends on temperature’s effect on metabolism and circulation. As the core temperature falls toward 30°C–32°C, enzymatic activity slows, cardiac output and tissue perfusion decrease, and receptor signaling becomes blunted. In this state, medications used for rewarming and resuscitation—vasopressors, antiarrhythmics, sedatives, analgesics—do not produce reliable effects. Therefore, pharmacologic therapies are ineffective below roughly 30–32°C, and the focus should be on active warming to raise the core temperature to a range where drug responses are predictable. The other options don’t fit, since drug therapies can work at normal temperatures and aren’t limited to all temperatures or only below 40°C.