Question:
Identify the image with the diagnosis.
Identify the image with the diagnosis.
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Abrupt-onset regular narrow-complex tachycardia from above the ventricles.
Updated On: Jun 23, 2026
- VT
- PSVT
- AT
- Ventricular fibrillation
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The Correct Option is B
Solution and Explanation
Step 1: The tracing shows paroxysmal supraventricular tachycardia (PSVT). It is an abnormally fast heartbeat that originates above the ventricles.
Step 2: PSVT is driven by abnormal re-entrant circuitry in the heart, often congenital, which creates a self-sustaining loop of overlapping electrical signals. The ECG shows a narrow-complex tachycardia that is regular and starts and stops abruptly (paroxysmal).
Step 3: Why the distractors are wrong: ventricular tachycardia (VT) is a wide-complex tachycardia arising below the bundle branches; ventricular fibrillation is a chaotic, disorganised, pulseless rhythm; atrial tachycardia (AT) is a focal atrial rhythm but the regular, abrupt-onset narrow-complex pattern shown is best labelled PSVT.
Step 2: PSVT is driven by abnormal re-entrant circuitry in the heart, often congenital, which creates a self-sustaining loop of overlapping electrical signals. The ECG shows a narrow-complex tachycardia that is regular and starts and stops abruptly (paroxysmal).
Step 3: Why the distractors are wrong: ventricular tachycardia (VT) is a wide-complex tachycardia arising below the bundle branches; ventricular fibrillation is a chaotic, disorganised, pulseless rhythm; atrial tachycardia (AT) is a focal atrial rhythm but the regular, abrupt-onset narrow-complex pattern shown is best labelled PSVT.
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