The in-vitro Properties of Mass Spectrometers Catheters as a Function of Pressure.

摘要

The use of mass spectrometry for the measurement of blood gases was introduced by Woldring, et al in 1966 and since that time its use in the clinic has been increasing yearly. The growing popularity of the method is due, in part, to the unique capability of the mass spectrometer-catheter combination to measure not only metabolic but also inert and anesthetic gases on-line, continuously and without the withdrawal of blood. These attributes make the method especially suitable to the high pressure environment where adaptation of conventional blood gas apparatus is difficult. Little data exist on the methodological capabilities of the mass spectrometer-catheter combination for inert gases, and there are no reports describing the usefulness or non-usefulness of this technique under increased pressure. The report focused on the performance of teflon catheters under pressure, although the pressure capabilities and gas transfer rate of silastic catheters was also tested.