Early postoperative arterial oxygen desaturation. Determining factors and response to oxygen therapy.
Oxygen arterial saturation (SaO2) was measured with a pulse oximeter in 209 patients after elective surgery. Measurements were made upon arrival in the recovery room (RR) and 1 hr later. On each occasion, the patients randomly and alternately breathed--for 10 min at a time--room air or 35% O2. Factors that might influence the incidence of postoperative hypoxemia were analyzed. After breathing room air for 10 min after arrival in the RR, the mean SaO2 was 90.7 +/- 3.9% (+/- SD). Twenty min after and 1 hr after arrival in the RR, mean SaO2 increased significantly to 92.4 +/- 3.5% (P less than 0.001) and 93.2 +/- 3.0% (P less than 0.001), respectively. Postoperative hypoxemia (SaO2 less than or equal to 90%) after breathing room air for 10 min at 10 min, 20 min, and 1 hr after arrival in the RR occurred in 43.8%, 26.9%, and 16.9% of the patients, respectively. Breathing 35% O2 for 10 min 10 min after arrival in the RR, as well as 20 min and 1 hr after arrival, significantly increased SaO2 above the SaO2 level after breathing room air by 5.7% (P less than 0.001), 4.3% (P less than 0.001), and 4.0% (P less than 0.001), respectively. A significant multiple correlation was found between low SaO2 levels while breathing room air on arrival in the RR and fentanyl dose, age, and concentration of halothane used intraoperatively (R = 0.46; P less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
Canet
J
J
Servei d'Anestesiología i Reanimació, Hospital Germans Trias i Pujol, Barcelona, Spain.
Ricos
M
M
Vidal
F
F
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000762:Anesthesia Recovery Period; D000765:Anesthesia, Conduction; D000768:Anesthesia, General; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D000860:Hypoxia / Q000097:blood; D008297:Male; D008875:Middle Aged; D010092:Oximetry; D010100:Oxygen / Q000097:blood*; D010102:Oxygen Inhalation Therapy; D011184:Postoperative Period; D011897:Random Allocation
D010100:Oxygen