ahi_ap0uhp5x0u_f1t1 - Search - Sleep Data - National Sleep Research Resource

Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

rditstpsg under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in APPLES variables

Hypopneas are defined using two criteria: a > 50%, but <= 90% amplitude decrease from baseline of the nasal pressure signal; or if there was a clear amplitude reduction of the nasal pressure signal that did not reach the above criterion but it was associated with either an oxygen desaturation > 3% or an arousal, and the event duration was >= 10 seconds. The definition of hypopnea events is consistent with the following clinical guidelines: American Academy of Sleep Medicine (AASM) Chicago 1999 standard. Sleep 1999 (PubMed ID:10450601) Search for all AHI variables consistent with the same clinical guidelines within this dataset

Apnea-Hypopnea Index: (All apneas + hypopneas with >50% flow reduction or discernible flow reduction with >=3% desat or arousal) / hour of sleep

nsrr_ahi_chicago1999 under Harmonized/Polysomnography/Apnea-Hypopnea Indices in APPLES variables

Harmonized by the NSRR team.The definition of hypopnea events is consistent with the following clinical guidelines: American Academy of Sleep Medicine (AASM) Chicago 1999 standard. Sleep 1999 (PubMed ID:10450601) Search for all AHI variables consistent with the same clinical guidelines within this dataset Refer to the source for detailed definition for respiratory events: :rditstpsg:

Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with no oxygen desaturation used and with or without arousal) / hour of sleep from type I polysomnography

rdim0p under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

[(total number of apneas and hypopneas) / (hours of sleep)]

Apnea-Hypopnea Index (Non-Supine): (Apneas with no oxygen desaturation threshold used only with arousal + hypopneas with > 50% flow reduction and with no oxygen desaturation used only with arousal) / hour of sleep in non-supine position from type I polysomnography

rdim0pns under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Non-supine Respiratory Disturbance Index (RDI) at all desaturations [(total number of apneas and hypopneas in non-supine body position) / (hours of sleep)]

Apnea-Hypopnea Index (Supine): (Apneas with no oxygen desaturation threshold used only with arousal + hypopneas with > 50% flow reduction and with no oxygen desaturation used only with arousal) / hour of sleep in supine position from type I polysomnography

rdim0ps under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Supine Respiratory Disturbance Index (RDI) at all desaturations [(total number of apneas and hypopneas in supine body position) / (hours of sleep)]

Apnea-Hypopnea Index (NREM): (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with no oxygen desaturation used and with or without arousal) / hours of NREM sleep from type I polysomnography

rdimnr0p under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Non-rapid eye movement sleep (NREM) Respiratory Disturbance Index (RDI) at all desaturations [(total number of apneas and hypopneas in non-rapid eye movement sleep (NREM)) / (hours of non-rapid eye movement sleep (NREM))]

Apnea-Hypopnea Index (REM): (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and with no oxygen desaturation used and with or without arousal) / hours of REM sleep from type I polysomnography

rdimrem0p under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

[(total number of apneas and hypopneas in rapid eye movement sleep (REM)) / (hours of rapid eye movement sleep (REM))]

Apnea-Hypopnea Index (NREM): (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of NREM sleep from type I polysomnography

rdinrempsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables

Apnea-Hypopnea Index (REM): (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 50% flow reduction and without oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 3% oxygen desaturation or with arousal) / hour of REM sleep from type I polysomnography

rdirempsg under Sleep Monitoring/Polysomnography/Respiratory Event Counts in APPLES variables