title: Umbilical cord pH and base excess values in relation to neonatal morbidity for infants delivered preterm.
abstract: OBJECTIVE
  Our purpose was to determine the relationship/predictive value of umbilical cord pH and base excess (BE) values to adverse neonatal outcomes for preterm infants.
  
  
  METHODS
  A tertiary center perinatal/neonatal database was used to obtain umbilical cord pH and BE values, adverse neonatal outcomes, and patient demographics for preterm (PT, 32-36 weeks gestational age) and very preterm (VPT, 25-32 weeks gestational age) singleton live-born infants delivered between November 1995 and March 2002.
  
  
  RESULTS
  PT (n=1807) and VPT (n=603) groups demonstrated a significant inverse curvilinear relationship of umbilical cord pH and BE values to Apgar score <7 at 5 minutes, respiratory distress syndrome, assisted ventilation, and intraventricular hemorrhage/periventricular leukomalacia. Receiver operating characteristic area under the curve values ranged from 0.69 to 0.86 (PT) and 0.70 to 0.87 (VPT). There was little difference between umbilical vein, umbilical artery, pH, or BE in predictive value.
  
  
  CONCLUSIONS
  Umbilical cord pH and BE are related to subsequent adverse outcome events for infants delivered preterm. Worsening acidosis is associated with progressively greater increases in these outcomes with no discriminatory value within or between umbilical artery and umbilical vein pH and BE.
authors.affiliation: Department of Obstetrics and Gynecology, Pediatrics, and Physiology, St Joeseph's Health Care, University of Western Ontario, Canada.
authors.forename: Rahi
authors.initials: R
authors.lastname: Victory
authors.forename: Deborah
authors.initials: D
authors.lastname: Penava
authors.forename: Orlando
authors.initials: O
authors.lastname: da Silva
authors.forename: Renato
authors.initials: R
authors.lastname: Natale
authors.forename: Bryan
authors.initials: B
authors.lastname: Richardson
mesh_terms: D000136:Acid-Base Equilibrium; D001034:Apgar Score; D002543:Cerebral Hemorrhage / Q000453:epidemiology; D005312:Fetal Blood / Q000737:chemistry*; D005317:Fetal Growth Retardation / Q000150:complications; D005865:Gestational Age; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D007969:Leukomalacia, Periventricular / Q000453:epidemiology; D016015:Logistic Models; D009017:Morbidity; D016017:Odds Ratio; D012372:ROC Curve; D012121:Respiration, Artificial; D012127:Respiratory Distress Syndrome, Newborn / Q000453:epidemiology; D012307:Risk Factors; D014469:Umbilical Arteries; D014471:Umbilical Veins