Supraventricular tachyarrhythmia (SVT) is the most common type of arrhythmia in childhood. Management can be challenging with an associated risk of mortality. A female neonate was diagnosed with episodes of SVT, controlled antenatally with digoxin. Flecainide was commenced prophylactically at birth. Despite treatment, the infant developed a narrow complex tachycardia at 5 days of age. The electrocardiogram features were suggestive of either re-entry tachycardia or of automatic atrial tachycardia (AAT). Following several unsuccessful treatments, a wide complex tachycardia developed. A transesophageal electrophysiological study led to a diagnosis of AAT. Stable sinus rhythm was finally achieved through increasing daily administrations of flecainide up to six times a day, in association with nadolol. The shortening of intervals to this extent has never been reported before and supports the evidence of a personal, age-specific variability in pharmacokinetics of flecainide. Larger studies are needed to better define the appropriate dose and timing of administration.

Background: Esophageal atresia (EA) type A, characterized by the absence of a tracheoesophageal fistula and typically presenting with a long esophageal gap, usually requires staged repair. Methods: We report a rare case of a newborn with type A EA in which both the proximal and distal esophageal pouches were unexpectedly close and located in the cervical region. This anatomical variant allowed for a successful primary anastomosis through a cervical approach. Results: Initial imaging was misleading, and the true anatomy was clarified only through thoracoscopic exploration, underscoring the importance of intraoperative flexibility. Conclusions: To our knowledge, this is the first report of such a presentation in type A EA, with significant implications for diagnosis and surgical strategy.