Multifocal Atrial Tachycardia in a Newborn

Multifocal atrial tachycardia (MAT) is a rare arrhythmia in the newborn. MAT can be difficult to diagnose; it is frequently confused with atrial fibrillation. MAT is difficult to treat but often resolves spontaneously within the first year of life. A newborn with a rapid and irregular pulse rate was diagnosed with multifocal atrial tachycardia by eletrocardiography (ECG) using a hand-made transesophageal electrode. Treatment with propranolol was attempted but ineffective. Treatment with digoxin and sotalol was attempted. The heart rhythm gradually reverted to a sinus rhythm with this treatment. We report our experience managing a neonate with MAT diagnosed by ECG using a hand-made transesophageal electrode.