Cisapride associated with QTc prolongation in very low birth weight preterm infants

Objective. No systematic study has been performed to evaluate the effect of cisapride on the QT interval in premature infants. Cisapride, which has re cently been withdrawn by the Food and Drug Administration and is no longer an approved therapy, was commonly used for preterm infant care to improve t he advance of enteral feedings and to reduce reflux and associated apnea. O ur aim was to evaluate the effect of recommended doses of cisapride on the QT interval in this population. Study Design. Prospective blinded evaluation of electrocardiogram for QT, J T, QTc, and JTc measurements in 25 preterm infants before and after cisapri de administration. Results. Twelve of 25 infants (48%) developed repolarization abnormalities with cisapride administration: 32% of the infants (8/25) studied had QTc pr olongation (greater than or equal to0.450 seconds), whereas 10/25 had JTc p rolongation (greater than or equal to0.360 seconds). Preterm infants <32 we eks significantly prolonged their QTc interval from 0.41 +/- 0.02 to 0.44 /- 0.02. The QTc and/or JTc was prolonged in 54% of infants receiving 0.1 m g/kg/dose and 42% receiving 0.2 mg/kg/dose. Conclusions. The QTc and JTc interval significantly prolonged in preterm in fants <32 weeks on the recommended dose of cisapride therapy. A QTc greater than or equal to0.450 seconds developed in 32% of infants treated with cis apride, whereas the JTc prolonged in 40%. A significant percentage of infan ts (54%) developed prolonged QTc intervals at a dose of 0.1 mg/kg/dose. Fro m these data we conclude that there is a higher risk of prolongation of the QTc interval and risk of arrhythmias with greater prematurity.