Observation of early postoperative hypoxaemia in children undergoing elective plastic surgery.

The incidence, severity and duration of early postoperative hypoxaemia were determined in 420 healthy infants and children undergoing elective plastic surgery. Mean value of preoperative SpO2 was 98.3 +/- 0.87%. However, it decreased significantly to 92.7 +/- 4.01% immediately following anaesthesia in the postanaesthesia recovery room (PAR) when children breathed room air. Then SpO2 gradually increased to 93.8 +/- 4.25% at 10 min, 95.4 +/- 3.14% at 30 min, 96.6 +/- 2.25% at 60 min, 96.9 +/- 1.69% at 120 min, and 97.4 +/- 1.55% at 180 min, respectively. The incidence of hypoxaemia and severe hypoxaemia, which were 14.8% and 6.2% respectively on arrival in the PAR, decreased significantly to 6.6% and 1.9%, 30 min later. The hypoxaemia occurred most commonly within 1 h, particularly the first 30 min following anaesthesia. The hypoxaemia was more common and more severe in children undergoing cleft palate repair than other kinds of plastic surgery. A significant correlation was found between low SpO2 levels on admission to the PAR and children's age, fentanyl doses, and the infants' recovery score.