Hypothermia electrocardiogram

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Electrocardiogram

• Osborn waves may appear on the ECG for temperatures less tahn 91.4 degrees Fahrenheit (33 degrees Celsius)

1. There is a slowing of the sinus rate
2. Prolongation of the PR interval and the QTc
3. Prolongation of the QRS is often due to the appearance of the J wave
4. The most typical finding is the appearance of the Osborne J wave, an extra deflection between the QRS complex and the T wave.
   • Consistently found when the temperature falls below 25 degrees Centigrade.
   • More prominent in the left precordial leads
   • Increases in size with decreasing temperature
   • Caused by a current of injury, delayed ventricular depolarization, or early repolarization
5. About 50 to 60% of these patients develop atrial fibrillation. VF may also occur.

Osborne J waves due to hypothermia

Osborn J waves due to hypothermia

• 
  An Osborn J wave
• 
  Osborn wave. 81-year-old black male with BP 80/62 and temperature 89.5 degrees F (31.94 C)
• 
  A 12 lead ECG of a patient with a body temperature of 32 degrees Celsius. Note the sinus bradycardia, the prolonged QT interval (QTc is not prolonged) and the Osborn J wave, most prominently in leads V2-V5
• 
  An ECG of a patient with a body temperature of 28 degrees Celsius.