What do T wave inversions on a telemetry strip most commonly indicate?

What do T wave inversions on a telemetry strip most commonly indicate?

• A. Ischemia or evolving infarct
• B. Hyperkalemia
• C. Hypokalemia
• D. Normal variant

Answer: (A)

T wave inversions reflect abnormal ventricular repolarization, and on telemetry they most often point to ischemia or an evolving myocardial infarction. When myocardial tissue becomes ischemic, its repolarization is altered, which can cause the T wave to invert in the leads facing the affected area. This change can appear early in acute coronary syndromes, or as the infarct evolves and injury patterns shift, leading to persistent or deeper inversions in the involved territory. By contrast, hyperkalemia tends to produce tall, peaked T waves, not inversions; hypokalemia often causes flattened T waves with prominent U waves; while a normal variant can occur, in the setting of symptoms or ECG changes suggestive of ischemia, ischemia or evolving infarct remains the most likely explanation for T wave inversion.

T wave inversions reflect abnormal ventricular repolarization, and on telemetry they most often point to ischemia or an evolving myocardial infarction. When myocardial tissue becomes ischemic, its repolarization is altered, which can cause the T wave to invert in the leads facing the affected area. This change can appear early in acute coronary syndromes, or as the infarct evolves and injury patterns shift, leading to persistent or deeper inversions in the involved territory.

By contrast, hyperkalemia tends to produce tall, peaked T waves, not inversions; hypokalemia often causes flattened T waves with prominent U waves; while a normal variant can occur, in the setting of symptoms or ECG changes suggestive of ischemia, ischemia or evolving infarct remains the most likely explanation for T wave inversion.