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Obstructive Sleep Apnea in Pregnancy

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Part of the book series: Respiratory Medicine ((RM))

Sleep-disordered breathing (SDB) and obstructive sleep apnea syndrome (OSAS) are defined using the apnea-hypopnea index (AHI) from overnight polysomnography (PSG). AHI is the sum of apneic and hypopneic events per hour of sleep (1). Obstructive apneas are defined by more than 80% decrease in airflow for 10 s or more in the presence of thoraco-abdominal efforts. Hypopneas are defined by a decrease in airflow of at least 30% for 10 s or more accompanied by decreased oxygen saturations by 4% or more in the presence of thoraco-abdominal efforts. An AHI greater than 5 events per hour is diagnostic of OSAS and an AHI greater than 30 events per hour indicates severe disease. Percentage of sleep time spent below 90% oxygen saturation and the average number of arousals per hour of sleep aid in the assessment of SDB.

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Akgun, K., Roux, F.J. (2009). Obstructive Sleep Apnea in Pregnancy. In: Rosene-Montella, K., Bourjeily, G. (eds) Pulmonary Problems in Pregnancy. Respiratory Medicine. Humana Press. https://doi.org/10.1007/978-1-59745-445-2_9

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  • DOI: https://doi.org/10.1007/978-1-59745-445-2_9

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