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measured by both a nasal cannula-pressure transducer system and
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as measured by the nasal cannula-pressure transducer or thermal
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in oxyhemoglobin saturation. The nasal cannula-pressure transducer system was
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Nulliparous Pregnancy Outcomes Study Monitoring Mothers-to-be
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measuring SDB parameters: a nasalpressure transducer (measuring nasal airflow and waveform, needed
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a back-up for the nasalpressure signal); and finger pulse
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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