. (1974). Archives of Disease in Childhood, 49, 898. Preoperative plasma glucose level. The plasma glucose level of 25 infants and children who had routine preparation for anaesthesia and operation has been measured immediately after induction of anaesthesia. The mean plasma glucose level was 66 mg/100 ml. 5 patients had plasma glucose of 40 mg/100 ml or less. In a similar group in respect of age and weight a milk feed was given 4 hours before operation. The mean plasma glucose in the 20 patients in this group was 82 mg/100 ml and no patient had a plasma glucose of less than 60 mg/100 ml. No problems were encountered by giving the milk feed 4 hours before operation.To minimize the danger of vomiting and inhalation of vomit during induction or on recovery from general anaesthesia it is routine practice to ensure that the patient is presented for anaesthesia after a fast of at least 4 hours. The dangers of vomiting have been stressed so much that in most hospitals patients coming for anaesthesia have been starved for periods considerably in excess of 4 hours. This study was undertaken to determine the blood glucose levels in patients treated in the standard fashion of preoperative fasting and to compare this with a similar group of infants who had been given an oral milk feed 4 hours before operation.
Patients and methodsPatients under 5 years of age who were admitted for relatively minor surgical procedures were studied. They were arbitrarily split into 2 groups. 25 patients Received 24 April 1974. (group A) were treated in the routine manner. On investigating the duration of the preoperative period of fasting in these patients it was found to vary from 6 hours to 12 hours and on one occasion was over 12 hours. 20 infants (group B) were prepared in the routine fashion but 4 hours before operation each was given a milk feed of 10 ml/kg up to a maximum of 300 ml. (This upper limit was agreed before starting the series, but none of the patients weighed enough to require this volume.) The basic information on the 2 groups is given in Table I. The mean age of group A was 21 -4 months compared with 17 * 2 months in group B, and the mean weight 10-77 kg and 10-72 kg, respectively. These differences are not statistically significant.Premedication was given as ordered by the anaesthetist and the patients taken to theatre. Anaesthesia was induced by inhalation of nitrous oxide, oxygen, and halothane. Whenever the patients were anaesthetized a capillary blood sample was taken by a finger or heel prick. All patients had a good peripheral circulation at the time the blood sample was taken. The plasma glucose level was measured using the glucose oxidase autoanalyser method (Morley, Dawson, and Marks, 1968).
BLE IAge and weight and plasma glucose levels of patients in whom preoperative plasma glucose levels were studied: group A had standard preoperative care and group B were given milk 4 hours before operation Mean true glucose±SEM (and range) 66 1*13 7 (29-98) 82 1* ±3-4 (62-120) (mg/100 ml) *P <0 001 for difference...