Cameco anaesthetic ventilator with a modified Mapleson D circuit.
A modified Mapleson D circuit has been used in connection with a Cameco anaesthetic ventilator during neuroradiological procedures in general anaesthesia. In order to increase mobility of the patient, two or three lengths of corrugated rubber tubing were used to connect the patient to the ventilator. Blood gas analysis was carried out in 20 patients after ventilation to steady state with both circuits. The respiratory minute volume and fresh gas flow were preset in Bain's (Bain & Spoerel 1975) predictions. No significant difference could be detected in respect to Paco2 or Po2, whether 2 or 3 lengths of tubing were used. Mean values of Paco2 were higher compared with the results of Bain (0.37 kPa s.d. 0.50). It is concluded that this system gives maximum mobility of the patient during the radiological procedure and offers reliable adjustment of Paco2, even in patients with apparent increase of intracranial pressure.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000768:Anesthesia, General / Q000295:instrumentation*; D001921:Brain / Q000601:surgery; D006801:Humans; D007427:Intracranial Pressure; D008875:Middle Aged; D019635:Neurosurgical Procedures; D010313:Partial Pressure; D012121:Respiration, Artificial / Q000295:instrumentation*