Background: Cardiovascular changes during the transition from intra- to extrauterine life, alters pressure gradient across ductus arteriosus (DA). DA flow ratio (R-L/L-R) has been suggested reflect infant's transitional status and could potentially predict neonatal outcomes after preterm birth. Aim: Determine whether correlates with oxygenation parameters in infants at 1 h Methods: Echocardiogr...

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1 [email protected], Tel: +44 (0)115 846 6521. Fax: +44 (0)115 951 4254. 2 [email protected], Tel: +44 (0)1274 234005. Fax: +44 (0)1274 234054. 3 [email protected], Tel: +44 (0)115 951 4222. Fax: +44 (0)115 951 4249. *Research supported by EPSRC grant number GR/N04225/01, DASH associates and a committee of vice chancellors and Principals ORS award. Abstract This paper describes a new...