Osborn waves on ECG are most diagnostic of which condition?

Osborn waves on ECG are most diagnostic of which condition?

• A. Hypothermia
• B. Hyperkalemia
• C. Myocardial ischemia
• D. Hyperlipidemia

Answer: (A)

Osborn waves (J waves) are most diagnostic of hypothermia. They appear as a distinct notch or extra upward deflection at the end of the QRS complex at the J point on the ECG, and they become prominent when the core body temperature drops, typically below about 32°C. The underlying idea is that cooler temperatures alter myocardial repolarization in a way that creates this characteristic pattern. Hyperkalemia usually shows tall peaked T waves and QRS widening, ischemia presents with ST-segment changes and T-wave abnormalities, and hyperlipidemia does not produce this acute ECG finding. So, the presence of Osborn waves points most strongly to hypothermia.

Osborn waves (J waves) are most diagnostic of hypothermia. They appear as a distinct notch or extra upward deflection at the end of the QRS complex at the J point on the ECG, and they become prominent when the core body temperature drops, typically below about 32°C. The underlying idea is that cooler temperatures alter myocardial repolarization in a way that creates this characteristic pattern. Hyperkalemia usually shows tall peaked T waves and QRS widening, ischemia presents with ST-segment changes and T-wave abnormalities, and hyperlipidemia does not produce this acute ECG finding. So, the presence of Osborn waves points most strongly to hypothermia.