RT Book, Section
A1 Hudson, Arlene
A2 Freeman, Brian S.
A2 Berger, Jeffrey S.
SR Print(0)
ID 1135743880
T1 Obstructive Sleep Apnea
T2 Anesthesiology Core Review: Part Two Advanced Exam
YR 2016
FD 2016
PB McGraw-Hill Education
PP New York, NY
SN 9781259641770
LK accessanesthesiology.mhmedical.com/content.aspx?aid=1135743880
RD 2023/09/28
AB Obstructive  sleep  apnea  (OSA)  is  a  syndrome  of  repetitive  upper-airway  obstruction  during  sleep.  It  is  defined  as  five  or  more  episodes  per  hour  during  sleep  of  complete  airflow  cessation  (apnea)  or  a  partial  airflow  reduction  of  30%–99%  (hypopnea)  each  lasting  greater  than  10  seconds,  despite  continued  respiratory  effort,  and  accompanied  by  a  4%  decrease  in  oxygen  saturation.  Common  associated  symptoms  include  daytime  sleepiness,  impaired  concentration,  recurrent  awakenings  and  restless  sleep,  and  gasping/choking  sensations  during  sleep.  The  condition  is  described  by  the  Apnea-Hypopnea  Index  (AHI)  that  is  derived  from  the  total  number  of  apneas  and  hypopneas  per  hour  of  sleep.  The  American  Academy  of  Sleep  Medicine  defines  mild  OSA  as  AHI  5–15,  moderate  OSA  as  AHI  15–30,  and  severe  OSA  as  AHI  >  30.