title: Automatic end-tidal gas sampling system for non-invasive rCBF measurements.
abstract: Non-invasive measurements of regional cerebral blood flow (133Xe inhalation or IV injection) require knowledge of the arterial 133Xe concentrations, which is usually estimated from the end-tidal expiration. An automated sampling system is described for measurement of end-tidal 133Xe concentration that can be used in both spontaneously breathing and mechanically ventilated patients. A comparison is made between the automatic sampling system and manual measurements performed on a continuous gas sample.
mesh_terms: D001784:Blood Gas Analysis / Q000295:instrumentation* / Q000379:methods; D002560:Cerebrovascular Circulation; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D014980:Xenon Radioisotopes
chemical_list: D014980:Xenon Radioisotopes