What EKG finding is pathognomonic for hypothermia?

What EKG finding is pathognomonic for hypothermia?

• A. J wave of Osborn
• B. Prolonged QT
• C. Atrial fibrillation
• D. Peaked T waves

Answer: (A)

When the body is cooled, the heart’s repolarization changes in a way that creates a distinctive deflection at the junction after the QRS complex—the J point. This J wave, also called the Osborn wave, is the single best clue on an ECG for hypothermia. Its presence is highly characteristic of cold cardiomyopathy: the colder the patient, the more prominent the wave, and it’s most evident in the precordial leads. Other common ECG changes like a prolonged QT, atrial fibrillation, or peaked T waves can occur in many conditions and don’t point specifically to hypothermia, so they’re less informative in this context. Seeing Osborn waves in a patient with suspected hypothermia strongly supports the diagnosis and guides management toward gradual rewarming and careful monitoring. Mechanistically, it reflects temperature-dependent differences in epicardial versus endocardial repolarization due to altered ion currents in the cold.

When the body is cooled, the heart’s repolarization changes in a way that creates a distinctive deflection at the junction after the QRS complex—the J point. This J wave, also called the Osborn wave, is the single best clue on an ECG for hypothermia. Its presence is highly characteristic of cold cardiomyopathy: the colder the patient, the more prominent the wave, and it’s most evident in the precordial leads. Other common ECG changes like a prolonged QT, atrial fibrillation, or peaked T waves can occur in many conditions and don’t point specifically to hypothermia, so they’re less informative in this context. Seeing Osborn waves in a patient with suspected hypothermia strongly supports the diagnosis and guides management toward gradual rewarming and careful monitoring. Mechanistically, it reflects temperature-dependent differences in epicardial versus endocardial repolarization due to altered ion currents in the cold.