An evaluation of the Hellige Transoxode (Servomed Oxymonitor SM 361 System): response to halothane and enflurane in vitro.
The effects of halothane (0.5-2%) and enflurane (1-4%) on two Transoxode transcutaneous oxygen (TcPO2) electrodes (Hellige Servomed Oxymonitor SM.361 system) were serially tested in atmospheres of nitrogen, air and 50% nitrous oxide in oxygen. Both TcPO2 electrodes reduced and "read" halothane but no enflurane. Calibration drift was significantly greater (p less than 0.05) after electrode exposure to halothane; 5.40 s.e.m. 1.37 kPa vs enflurane; -0.60 s.e.m. 0.93 kPa. Halothane has a direct effect in rendering the Transoxode inaccurate, which is probably clinically less important than the indirect cardiovascularly medicated influence of both halothane and enflurane on TcPO2 levels. A reduction in the electrode polarisation voltage is recommended to obviate the direct effect of halothane on Transoxode performance.
D000388:Air; D004566:Electrodes / Q000592:standards*; D004737:Enflurane; D005069:Evaluation Studies as Topic; D006221:Halothane; D066298:In Vitro Techniques; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D009584:Nitrogen; D009609:Nitrous Oxide; D010100:Oxygen; D010313:Partial Pressure; D013997:Time Factors
D004737:Enflurane; D009609:Nitrous Oxide; D009584:Nitrogen; D010100:Oxygen; D006221:Halothane