ahi - Search - Sleep Data - National Sleep Research Resource

PSG Quality Assessment: Medical Alert - AHI > 50

poahio50 under Sleep Monitoring/Polysomnography/Medical Alerts in MROS variables

Medical Alert for AHI over 50

Apnea-Hypopnea Index: (Apneas with no oxygen desaturation threshold used + hypopneas with > 50% flow reduction and >= 3% oxygen desaturation) / hours of estimated sleep from type III home sleep apnea test

ahi_screening under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in HEARTBEAT variables

Calculated - Summary metric of sleep disordered breathing events from the baseline screening visit.Estimated sleep duration, providing an approximation of total sleep duration (i.e. total sleep time) inferred from analysis of non-EEG channels Zhao et al., 2017 (PMID:27707441)There is a HeartBEAT specific respiratory event index measure :aphypi:. Details can be found in the Embletta scoring manual.

Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation) / hour of estimated sleep from type III home sleep apnea test

ahi_primary under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in BESTAIR variables

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the following clinical guidelines: (1) AASM 2012 update (alternative) Berry RB et al. 2012 (PubMed ID:23066376), and (2) AASM 2015 (acceptable) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.].

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

ahi_a0h3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in SOF variables

Calculated - Summary metric of sleep disordered breathing events.

Apnea-Hypopnea Index: (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 30% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type II polysomnography

ahi_a0h4a under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in SOF variables

Calculated - Summary metric of sleep disordered breathing events

Apnea-Hypopnea Index: (Apneas with no oxygen desaturation threshold used and with or without arousal and hypopneas with discernible flow reduction and with >= 4% oxygen desaturation and with or without arousal) / hours of sleep from type I polysomnography

ahi under Sleep Monitoring/Polysomnography in WSC variables

Calculated - Summary metric of sleep disordered breathing events

Polysomnography (PSG) Quality Assessment: Medical Alert - Apnea-Hypopnea Index (AHI) > 50

ahiov50 under Sleep Monitoring/Polysomnography/Administrative in SHHS variables

Medical Alert for Apnea-Hypopnea Index (AHI) over 50.

ahi_a0h3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in SHHS variables

Calculated - Summary metric of sleep disordered breathing events.

ahi_a0h4a under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in SHHS variables

Calculated - Summary metric of sleep disordered breathing events

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 >=30% nasal cannula [or alternative sensor] reduction and >= 3% oxygen desaturation or with arousal) / hour of sleep

nsrr_ahi_hp3r_aasm15 under Harmonized/Polysomnography/Apnea-Hypopnea Indices in MSP variables

Harmonized by the NSRR team. The definition for hypopneas is consistent with the following clinical guidelines: (1) American Academy of Sleep Medicine (AASM) 2007 Manual (2012 update) (recommended). Berry RB et al. 2012 (PubMed ID:23066376), and (2) American Academy of Sleep Medicine (AASM) 2015 (recommended) [Berry RB et al. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications, Version 2.2. American Academy of Sleep Medicine, Darien, IL, 2015.] Refer to the source for detailed definitions of respiratory events: :ahi1:

Apnea-Hypopnea Index : (All apneas + hypopneas with >= 3% oxygen desaturation) / hour of sleep

nsrr_ahi_hp3u under Harmonized/Polysomnography/Apnea-Hypopnea Indices in MSP variables

Harmonized by the NSRR team. Refer to the source for detailed definitions of respiratory events: :ahi2:

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

ahi_a0h3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CCSHS variables

Calculated - Summary metric of sleep disordered breathing events.

Apnea-Hypopnea Index: (All apneas with no oxygen desaturation threshold used and with or without arousal + hypopneas with > 30% flow reduction and with >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

ahi_a0h4a under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CCSHS variables

Calculated - Summary metric of sleep disordered breathing events.

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

ahi_a0h3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation and with or without arousal) / hour of sleep from type I polysomnography

ahi_a0h4 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Calculated - Summary metric of sleep disordered breathing events.

Apnea-Hypopnea Index : (Apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 4% oxygen desaturation or with arousal) / hour of sleep from type I polysomnography

ahi_a0h4a under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Calculated - Summary metric of sleep disordered breathing events.

Childhood Adenotonsillectomy Trial (CHAT) Apnea-Hypopnea Index (AHI) - Obstructive and Mixed Apnea-Hypopnea Index: (Obstructive apneas with no oxygen desaturation threshold used and with or without arousal+ mixed apneas with no oxygen desaturation threshold used and with or without arousal+ hypopneas with > 50% flow reduction and >= 3% oxygen desaturation or arousal) / hour of sleep from type I polysomnography

omahi3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in CHAT variables

Calculated - Summary metric of sleep disordered breathing events. The definition of hypopnea events is consistent with the American Academy of Sleep Medicine (AASM) 2007 Manual (pediatric). [Iber C et al. The AASM manual for the scoring of sleep and associated events: rules, terminology and technical specifications. Vol. 1. Westchester, IL: American Academy of Sleep Medicine, 2007] Search for all AHI variables consistent with the clinical guidelines within this dataset

ahi_a0h3 under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in MESA variables

Calculated - Summary metric of sleep disordered breathing events.

ahi_a0h4a under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in MESA variables

Calculated

dataset-introduction.md

Home Positive Airway Pressure

About the participants in SHHS1

Reply by mrueschman on February 29, 2016 on Forum

... variable is AHI_A0H3. Typically AHI is categorized as follows: ...

AHI vs RDI

Reply by windang on April 13, 2016 on Forum

... slpprdp) It looks like AHI at all oxygen desaturations ... do I then calculate AHI at all oxygen desaturations? ...

AHI vs RDI

Reply by mrueschman on April 17, 2016 on Forum

... that formula) represents the AHI included events at all ... more closely match an AHI because we don't typically ...

Definition of OAHI in the SHHS variable

Reply by windang on April 7, 2017 on Forum

... would be OAHI and AHI (ahi_a0h4)? I looked at ...