title: Characterization of cardiorespiratory events following gastroesophageal reflux in preterm infants.
abstract: OBJECTIVE
  The aim of this study was to characterize cardiorespiratory events in preterm infants after both acid and nonacid gastroesophageal reflux (GER) as detected by pH and multiple intraluminal impedance (MII).
  
  
  METHODS
  Twelve hour overnight studies were performed in 71 preterm infants (gestational age 29.4±3.0 weeks, birth weight 1319±496 g). Apnea ≥10 s in duration, bradycardia ≤80 b.p.m. and oxygen desaturation ≤85% that occurred within 30 s after the initiation of GER were classified as associated with GER.
  
  
  RESULTS
  A total of 12,957 cardiorespiratory events and 4164 GER episodes were documented. Less than 3% of all cardiorespiratory events were preceded by GER constituting 3.4% of apnea, 2.8% of oxygen desaturation and 2.9% of bradycardia events. GER did not prolong cardiorespiratory event duration or increase severity. In contrast, GER was associated with a shorter duration of oxygen desaturation events (7.8±4.6 vs 6.3±5.6 s, P<0.05).
  
  
  CONCLUSIONS
  GER is rarely associated with cardiorespiratory events, and has no detrimental effect on cardiorespiratory event duration or severity.
authors.affiliation: Division of Neonatology, Department of Pediatrics, Rainbow Babies & Children's Hospital, Case Western Reserve University, Cleveland, OH 44106, USA. jmd3@case.edu
authors.forename: J
authors.initials: J
authors.lastname: Di Fiore
authors.forename: M
authors.initials: M
authors.lastname: Arko
authors.forename: B
authors.initials: B
authors.lastname: Herynk
authors.forename: R
authors.initials: R
authors.lastname: Martin
authors.forename: A M
authors.initials: AM
authors.lastname: Hibbs
mesh_terms: D001049:Apnea / Q000453:epidemiology*; D001919:Bradycardia / Q000453:epidemiology*; D002307:Cardiography, Impedance; D005260:Female; D005764:Gastroesophageal Reflux / Q000453:epidemiology*; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases; D008297:Male; D010100:Oxygen / Q000097:blood*
chemical_list: D010100:Oxygen