The clinical course of multifocal atrial tachycardia in infants and children
David J. Bradley, MD*,
Peter S. Fischbach, MD*,
Ian H. Law, MD ,
Gerald A. Serwer, MD, FACC* and
Macdonald Dick, II, MD, FACC*
* University of Michigan Congenital Heart Center and the Department of Pediatrics, University of Michigan, Ann Arbor, Michigan, USA
Division of Pediatric Cardiology, Department of Pediatrics, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
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Figure 1 Electrocardiogram (from patient 6) demonstrating typical characteristics of multifocal atrial tachycardia, with five different P-wave morphologies (arrows), irregular, rapid atrial rhythm and variable ventricular conduction.
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Figure 2 Histogram demonstrating distribution of patients by age at diagnosis of multifocal atrial tachycardia. Most children diagnosed with multifocal atrial tachycardia are infants.
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Figure 3 Kaplan-Meier analysis of duration of arrhythmia for the 19 patients in whom it was known. Dotted lines indicate the 95% confidence intervals. Fifty percent of patients reverted to sinus rhythm within five months. MAT = multifocal atrial tachycardia.
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Figure 4 Selected electrocardiograms. (A,B) Typical findings of multifocal atrial tachycardia, demonstrating rapid atrial rate with multiple P-wave morphologies, and irregular, rapid ventricular response (patients 6 and 21). (C) Atrial fibrillation-like tracing (patient 5; see text).
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