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ECG puzzle: Persistent narrow-QRS tachycardia in a 62-year-old woman
Sofia Andraz1, Joana Massa Pereira1, Lucas Hamann1
1Unidade Local de Saúde do Algarve, Cardiology Department, R. Leão Penedo, 8000-386 Faro, Portugal.
Abstract:
We report a 62-year-old woman with a long history of palpitations who presented with fatigue and acute dyspnea. ECG demonstrated a regular narrow-QRS tachycardia with long RP' intervals and 1:1 atrioventricular conduction. Episodes were recurrent despite amiodarone and beta-blockers, and transthoracic echocardiography revealed severe biventricular dysfunction which improved after rhythm control. We discuss the ECG features, mechanisms, and diagnostic clues of long RP' supraventricular tachycardia in adults.
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