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eFigure 10–3. Paroxysmal supraventricular tachycardia. A 12 lead electrocardiograph from a patient with paroxysmal supraventricular tachycardia.

Current Medical Diagnosis & Treatment 2025 > Common Symptoms

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eFigure 12–6. Short PR. Normal P wave with PR interval < 0.12 sec. A 31-year-old woman came to the emergency department following an episode of syncope consistent with vasovagal type. She has no history of palpitation or documented tachycardia. Her previous ECG had similar pattern. The possible etiologies of short PR interval are rapid conduction in an anatomically normal AV node, conduction through fast pathway, paranodal fiber, conduction bypasses most or all of the AV node, and small, underdeveloped AV node. Lown-Ganong-Levine syndrome includes (1) PR interval < 0.12 second, (2) normal P wave, (3) normal QRS duration, and (4) documented paroxysmal supraventricular tachycardia. A 12 lead electrocardiograph shows a rhythmic tracing with a short P R interval in lead 2.

Current Medical Diagnosis & Treatment 2025 > PSVT Due to Accessory AV Pathways (Preexcitation Syndromes)

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