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Double atrial tachycardia with functional atrial dissociation
Giornale Italiano Di Cardiologia
|January 1, 1981
Summary
This study describes a rare case of double atrial tachycardia, a condition not previously documented, identified during an electrophysiological study in a patient with heart disease. The tachycardia was caused by functional atrial dissociation due to refractory periods from two distinct foci.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Arrhythmias
Background:
- A 57-year-old male with hypertensive and coronary heart disease experienced palpitations due to bradycardia-tachycardia syndrome.
- Electrocardiogram (ECG) revealed low atrial tachycardia with Wenckebach atrioventricular (A-V) block.
Observation:
- Electrophysiological study identified atrial tachycardia with distinct potentials in high and His bundle recordings.
- Atrioventricular conduction demonstrated Wenckebach block, with varying intervals between atrial potentials.
- High atrial tachycardia ceased, leaving persistent low atrial tachycardia with high atrium capture.
Findings:
- The study identified a unique form of double atrial tachycardia, characterized by functional atrial dissociation.
- This dissociation was induced by refractoriness from two distinct tachycardia foci, a mechanism previously undescribed.
- The condition was not detectable on standard surface ECG leads.
Implications:
- This case expands the understanding of complex atrial tachycardias and their electrophysiological mechanisms.
- It highlights the importance of electrophysiological studies for diagnosing rare arrhythmias.
- The findings contribute to the differential diagnosis of tachycardias originating from different atrial sites.