title: Polygraphic findings of 47 cases with respiratory inhibition after crying.
abstract: OBJECTIVE
  To report the polygraphic findings of infants with respiratory inhibition after crying (RIAC).
  
  
  METHODS
  We screened for RIAC among infants with a gestational age ≥36 weeks using our established method with cranial ultrasonography, SpO(2) monitoring and polygraphy. RIAC is defined as central apnea that occurred immediately after crying with a decrease in SpO(2) to <60%, followed by repeated irregular respiration and apnea as the respiration gradually recovered. The subjects were infants with RIAC for whom we could study the polygraphic findings in detail.
  
  
  RESULTS
  Forty-seven RIAC cases were included in the present analysis. The frequency of RIAC was 2.1 (1.2-7.0) times per 24 h. The maximum duration of respiratory inhibition was 78.0 (52.6-109.0) s. The maximum duration of SpO(2) <60% during RIAC was 39.0 (9.8-93.2) s. The minimum SpO(2) value during RIAC was 53.0% (42.2-58.0%). The minimum heart rate during RIAC was 103.0 (79.1-127.1) bpm.
  
  
  CONCLUSIONS
  RIAC is observed among healthy infants, and they experience repeated prolonged hypoxemia.
authors.affiliation: Department of Neonatal Intensive Care Unit, Nara Prefectural NARA Hospital , Nara , Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Minowa
authors.forename: Aya
authors.initials: A
authors.lastname: Mima
authors.forename: Yuka
authors.initials: Y
authors.lastname: Ikeda
authors.forename: Hajime
authors.initials: H
authors.lastname: Yasuhara
authors.forename: Reiko
authors.initials: R
authors.lastname: Ebisu
authors.forename: Ayako
authors.initials: A
authors.lastname: Ohgitani
mesh_terms: D000328:Adult; D001049:Apnea / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D003448:Crying / Q000502:physiology*; D004453:Echoencephalography; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D000860:Hypoxia / Q000503:physiopathology; D007231:Infant, Newborn; D008297:Male; D009068:Movement / Q000502:physiology; D009991:Oscillometry / Q000379:methods; D010092:Oximetry; D015656:Respiratory Mechanics; D056152:Respiratory Rate / Q000502:physiology*; D013909:Thorax / Q000502:physiology; D055815:Young Adult
keywords: Cranial ultrasonography; SpO2 monitoring; hypoxemia; infants; polygraphy