Effect of Severity of Esophageal Acidification on Sleep vs Wake Periods in Infants Presenting with Brief Resolved Unexplained Events.
To describe the pattern of gastroesophageal reflux (GER) events in wake and sleep states with increasing acid reflux index (ARI) in neonates and to test the hypothesis that GER-related symptoms are frequent in ARI >7% in wake state.



Infants underwent 24-hour pH-impedance studies with 6-hour concurrent video-polysomnography studies. Data were stratified based on the 24-hour ARI (% duration that esophageal pH is <4) into ARI < 3% (normal), ARI 3 ≥ to ≤7% (intermediate), and ARI >7% (abnormal). GER frequency, clearance mechanisms, and symptoms were distinguished during wake state and sleep state.



Total wake and sleep duration was similar (P ≥ .2) in all ARI groups. Acidic events were frequent with increasing ARI in wake state vs sleep state (P ≤ .03). The symptom index increased with increasing ARI (P ≤ .02) in both wake state and sleep state. Acid clearance time increased with increasing ARI in wake state (P ≤ .02). In ARI > 7% vs ARI ≤ 7%, frequency of acidic GER events was higher (P ≤ .02) in wake state and sleep state; proximal migration of acid (P = .03) and acid clearance time were higher in wake state (P = .0005) only. Symptom index was higher in ARI >7% vs ARI ≤ 7% in wake state (P < .0001), comparable in normal vs intermediate (P = .4), and higher in abnormal vs intermediate (P = .0004) groups.



Severe esophageal acid exposure (ARI >7%) is associated with increased reflux-associated symptoms in wake state. Sleep state appears to be protective regardless of ARI, likely because of greater chemosensory thresholds. Attention to posture and movements during wake state can be helpful. Scrutiny for non-GER etiologies should occur for infants presenting with life-threatening symptoms.
Innovative Neonatal and Infant Feeding Disorders Research Program, Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH.
Janani
J
Sankaran
Innovative Neonatal and Infant Feeding Disorders Research Program, Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH.
Aslam H
AH
Qureshi
Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH; Division of Pediatric Gastroenterology and Nutrition, Nationwide Children's Hospital, Columbus, OH.
Frederick
F
Woodley
Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH; Division of Pulmonary Medicine, Sleep Laboratory, Nationwide Children's Hospital, Columbus, OH.
Mark
M
Splaingard
Innovative Neonatal and Infant Feeding Disorders Research Program, Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH; Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH; Division of Pediatric Gastroenterology and Nutrition, Nationwide Children's Hospital, Columbus, OH; Division of Neonatology, Nationwide Children's Hospital, Columbus, OH. Electronic address: sudarshan.jadcherla@nationwidechildrens.org.
Sudarshan R
SR
Jadcherla
D017097:Electric Impedance; D005764:Gastroesophageal Reflux / Q000503:physiopathology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007223:Infant; D000071896:Medically Unexplained Symptoms; D012720:Severity of Illness Index; D012890:Sleep; D014851:Wakefulness
aero-digestive protection; gastroesophageal reflux; polysomnography
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