ATRIAL ABNORMALITIES AND NEONATAL BRADYCA RDIA - A REVIEW OF 40 CASES

P wave modifications are common in neonatal bradycardia. Forty cases w ere studied, including 35 with changes in the P wave axis. The most co mmon features were a history of rhythm disturbances in utero, male gen der, adverse events during the pregnancy, and presence of a gastroesop hageal reflux (GER) with a favorable response of the rythm disorder to anti-GER treatment. Echocardiography demonstrated a hyperkinetic atri al septum that bulged into one or both atrial chambers, as well as a p rominent crista terminalis. Overall, these phenomena tended to be tran sient and were consistent with << postnatal completion of anatomic dev elopment >>.