Hypothermia electrocardiogram

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

Overview

Hypothermia is characterized on the EKG by sinus bradycardia, PR prolongation, QT prolongation, QRS prolongationand Osborn waves.

Electrocardiographic Findings

  • 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
Osborne J waves due to hypothermia
Osborn J waves due to hypothermia


References

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