title: Risk factors of intraoperative oxygen desaturation: a case-control study of 152,314 anesthetics.
abstract: BACKGROUND
  The present study was part of the Thai Anesthesia Incidents Study (THAI Study) of anesthetic adverse outcomes.
  
  
  OBJECTIVE
  To determine factors related to intraoperative oxygen desaturation (SpO2 < or =85% or < 90% for more than 3 min).
  
  
  METHODS
  During a 12-month period (February 1, 2003 - January 31, 2004), a prospective multicentered registry of patients receiving anesthesia was conducted in 20 hospitals across Thailand Anesthesia personnel filled up patient-related, surgical-related, and anesthesia related variables and adverse outcomes including intraoperative oxygen desaturation. A case-control (1:4) study of patients with and without intraoperative oxygen desaturation in the THAI Study database was done. Univariate and multivariate analysis were used to identify factors related to intraoperative oxygen desaturation. A p-value < 0.05 was considered as significant.
  
  
  RESULTS
  Among 152,314 patients without preanesthetic desaturation in the database, 328 cases of intraoperative oxygen desaturation were matched with 1312 control patients without desaturation. Variables that predict desaturation by multiple logistic regression were age less than 5 years old [OR 9.3 (95% CI 5.4-16.0)], ASA physical status 3, 4, 5 [OR 3.1 (95% CI 2.2-4.3)], history of upper respiratory tract infection [OR 10 (95% CI 1.9-51.6)], history of asthma [OR 2.9 (95% CI 1.0-9.5)], general anesthesia [OR 4.0 (95% CI 2.4-6.7)] duration of anesthesia 31-90 min [OR 1.9 (95% CI 1.2-3.0)], duration of anesthesia 91-150 min (OR 2.2 (95% CI 1.3-3.6)], and duration of anesthesia >150 min [OR 2.0 (95% CI 1.2-3.4)].
  
  
  CONCLUSIONS
  Knowing the risk factors of intraoperative oxygen desaturation helps improving personnel to improve preanesthetic conditions and facilitate early detection as well as prompt treatment of intraoperative oxygen desaturation.
authors.affiliation: Department of Anesthesiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand. somratcu@hotmail.com
authors.forename: Somrat
authors.initials: S
authors.lastname: Charuluxananan
authors.forename: Suwanee
authors.initials: S
authors.lastname: Suraseranivongse
authors.forename: Yodying
authors.initials: Y
authors.lastname: Punjasawadwong
authors.forename: Wanna
authors.initials: W
authors.lastname: Somboonviboon
authors.forename: Surirat
authors.initials: S
authors.lastname: Sriswasdi
authors.forename: Tharnthip
authors.initials: T
authors.lastname: Pranootnarabhal
authors.forename: Thavat
authors.initials: T
authors.lastname: Chanchayanon
authors.forename: Waraporn
authors.initials: W
authors.lastname: Chau-in
authors.forename: Nirun
authors.initials: N
authors.lastname: Intarut
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000758:Anesthesia / Q000009:adverse effects*; D000776:Anesthesiology; D000777:Anesthetics / Q000009:adverse effects*; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D019992:Databases as Topic; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D000860:Hypoxia / Q000209:etiology*; D007431:Intraoperative Complications; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010102:Oxygen Inhalation Therapy; D019990:Perioperative Care; D011446:Prospective Studies; D012042:Registries; D012307:Risk Factors; D013785:Thailand
chemical_list: D000777:Anesthetics