title: Bench study of auto-CPAP devices using a collapsible upper airway model with upstream resistance.
abstract: The aim of this study was to investigate the response of auto-CPAP devices to respiratory events (apnea, hypopnea, flow-limitation and snoring) on the same condition using a physiological upper airway model. The hypothesis of this study is that collapsibility of the flow-limiting collapsible segment of the airway is influenced by the upstream airway resistance. Five auto-CPAP devices, AutoSet T, AutoSet Spirit, Goodnight 420E, PV10i and REMstar Auto were evaluated. Apnea: all the devices increased the auto-CPAP level, while AutoSet T and AutoSet Spirit did not respond to apnea for 30s. Hypopnea: all the devices except the AutoSet T and Goodnight 420E increased pressure. Flow-limitation: all the devices except the PV10i and REMstar Auto increased pressure. Snoring: the snoring sounds disappeared when REMstar Auto and PV10i were used, and the Goodnight 420E lowered the level of snoring. In conclusion, the response of auto-CPAP devices to respiratory events differed. Collapsible upper airway model with upstream resistance is useful for the first-step assessment of auto-CPAP devices.
authors.affiliation: Department of Clinical Engineering, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan. hirose@kitasato-u.ac.jp
authors.forename: Minoru
authors.initials: M
authors.lastname: Hirose
authors.forename: Junichi
authors.initials: J
authors.lastname: Honda
authors.forename: Eiji
authors.initials: E
authors.lastname: Sato
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Shinbo
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kokubo
authors.forename: Toshio
authors.initials: T
authors.lastname: Ichiwata
authors.forename: Hirosuke
authors.initials: H
authors.lastname: Kobayashi
mesh_terms: D000403:Airway Resistance / Q000502:physiology*; D001331:Automation; D003198:Computer Simulation; D045422:Continuous Positive Airway Pressure / Q000295:instrumentation* / Q000379:methods*; D006801:Humans; D008954:Models, Biological; D012120:Respiration Disorders / Q000145:classification / Q000503:physiopathology; D012890:Sleep / Q000502:physiology