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OBJECTIVES

This study outlines the clinical course, treatment and the late outcome of infants and children with multifocal atrial tachycardia (MAT).

BACKGROUND

Multifocal atrial tachycardia is defined by three distinct P-waveforms, irregular P-P intervals, isoelectric baseline between P-waves and rapid rate on an electrocardiogram. Several smaller prior reports have described pediatric patients with MAT, but their long-term outcome has not been fully assessed.

METHODS

The clinical records, echocardiograms and long-term follow-up of patients with MAT were reviewed and compared to previous reports of MAT.

RESULTS

Fourteen boys and seven girls (median age 1.8 months) presented with MAT. At diagnosis, six patients had respiratory illness, of whom two were critical. Ten were asymptomatic. Seven patients had structural heart disease (SHD), one of whom died. Four of 15 patients (27%) with echocardiograms …