An irregular narrow complex tachycardia: atrial fibrillation or something else?
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FJT is a rare arrhythmia in adults and is characterised by a rapid heart rate, narrow QRS complexes and atrioventricular dissociation. Frequently, an irregular rhythm is present which could lead to misdiagnosis of atrial fibrillation. The response to antiarrhythmic drugs is usually poor. Ablation is considered an effective alternative . In this patient, after diagnosis of FJT, radiofrequency energy was delivered in the lower two-thirds of the Koch’s triangle, during which the tachycardia converted to sinus rhythm. Atrioventricular conduction was preserved. She remained free of symptoms during 3 months of follow-up.
Conflict of interest
M.J. Mulder, C.P. Allaart, H.A. Hauer and M.J.B. Kemme declare that they have no competing interests.
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