Shivering Management in Central Fever During Active Cooling

Initial Non-Pharmacologic Interventions

The European Society of Cardiology recommends initiating surface counterwarming immediately by warming extremities to reduce the shivering threshold by approximately 4°C per degree of mean skin temperature increase 4, 2
Ensure adequate ambient room temperature and use warmed intravenous fluids if the patient is receiving fluid resuscitation, as recommended by the European Heart Journal 5, 6

The European Heart Journal suggests administering acetaminophen as a non-sedating adjunct, though it is typically insufficient alone for clinically significant shivering 2, 3
Consider magnesium sulfate (2-4 g bolus, then 1 g/h infusion) to maintain serum levels below 4 mg/dL for safety, as recommended by the European Heart Journal 1, 7, 2

Meperidine 12.5-50 mg IV is the single most effective pharmacologic agent, stopping shivering in nearly 100% of patients within 5 minutes, according to the European Heart Journal 1, 8, 5
Meperidine is approximately 2,800 times more effective at inhibiting shivering than predicted by its analgesic potency alone, uniquely lowering the shivering threshold while directly suppressing shivering, as reported by the European Heart Journal 2, 3, 5

Use an analgesic-first approach with moderate-dose continuous opioid infusion (fentanyl or hydromorphone), as recommended by the European Heart Journal 1, 8
Add short-acting sedative (dexmedetomidine or propofol infusion) titrated to minimum dose that suppresses shivering, according to the European Heart Journal 1, 10

Neuromuscular blockade (NMB) is the most effective abortive measure for refractory shivering when less aggressive measures fail, as reported by the European Heart Journal 4, 3, 6
Cisatracurium (0.1-0.2 mg/kg bolus, then 0.5-10 μg/kg/min infusion) is preferred due to non-enzymatic plasma degradation, making it safe in renal and hepatic impairment, according to the European Heart Journal 1, 7

Shivering in central fever patients doubles metabolic rate and nearly triples oxygen consumption, creating significant energy supply-demand mismatch that can worsen secondary brain injury, as reported by the European Heart Journal 2, 6
Rule out infection as a concurrent cause of fever and shivering—obtain blood cultures if temperature ≥38.0°C and consider empiric antibiotics if sepsis is suspected, as recommended by the European Heart Journal 5, 6

Do not rely on acetaminophen or magnesium alone for clinically significant shivering—these are adjuncts only and insufficient as monotherapy, according to the European Heart Journal 3, 6
Do not use propofol or dexmedetomidine as first-line agents in hemodynamically unstable patients due to higher risk of hypotension; minimize sedative doses and have lower threshold for NMB in shock states, as recommended by the European Heart Journal 7, 10