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NBRC Registered Respiratory Therapist (RRT) Exit Practice Exam

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Depressed or inverted T waves indicate?
Correct Answer:
Myocardial ischemia
Explanation:
Depressed or inverted T waves reflect altered ventricular repolarization due to reduced oxygen supply to the heart muscle. When ischemia affects the myocardium, especially subendocardial tissue, repolarization changes cause the T wave to flatten or invert. This pattern is a classic sign of myocardial ischemia, seen with angina or NSTEMI. Other conditions don’t fit this pattern as neatly: pulmonary embolism isn’t defined by T wave inversion, pericarditis typically shows diffuse ST elevation with PR depression, and atrial fibrillation is a rhythm issue with absent P waves rather than characteristic T wave changes.

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