Which first-line pharmacologic treatment is most appropriate for postoperative shivering?

Which first-line pharmacologic treatment is most appropriate for postoperative shivering?

• A. Meperidine
• B. Dexmedetomidine
• C. Magnesium sulfate
• D. Naloxone

Answer: (A)

Postoperative shivering is driven by a reset of the body's central thermoregulation and a lowered shivering threshold. The most effective first-line pharmacologic way to counter this is to use an agent that directly blunts that central shivering drive. Meperidine is uniquely powerful for this purpose among common perioperative drugs because it has a strong anti-shivering effect at low, clinically tolerable doses, likely through central mechanisms involving opioid receptors that regulate thermoregulation. This makes it more reliable for stopping shivering quickly than other opioids or non-opioid options. Dexmedetomidine can mitigate shivering as well, but its use is limited by sedative and hemodynamic effects (bradycardia, hypotension), so it is usually not the first choice for treating shivering. Magnesium sulfate may help in some cases via NMDA antagonism, but its anti-shivering effect is less consistent. Naloxone would reverse opioid effects and does not provide a direct anti-shivering benefit, so it isn’t used for this purpose. In short, meperidine is the preferred initial pharmacologic treatment for postoperative shivering because of its reliable, central anti-shivering action at practical doses.

Postoperative shivering is driven by a reset of the body's central thermoregulation and a lowered shivering threshold. The most effective first-line pharmacologic way to counter this is to use an agent that directly blunts that central shivering drive. Meperidine is uniquely powerful for this purpose among common perioperative drugs because it has a strong anti-shivering effect at low, clinically tolerable doses, likely through central mechanisms involving opioid receptors that regulate thermoregulation. This makes it more reliable for stopping shivering quickly than other opioids or non-opioid options.

Dexmedetomidine can mitigate shivering as well, but its use is limited by sedative and hemodynamic effects (bradycardia, hypotension), so it is usually not the first choice for treating shivering. Magnesium sulfate may help in some cases via NMDA antagonism, but its anti-shivering effect is less consistent. Naloxone would reverse opioid effects and does not provide a direct anti-shivering benefit, so it isn’t used for this purpose.

In short, meperidine is the preferred initial pharmacologic treatment for postoperative shivering because of its reliable, central anti-shivering action at practical doses.