Lightweight remotely actuated switching valve for rebreathing exercise studies.
A new type of switching valve used in rebreathing studies for estimating cardiac output is described. This valve employs a unique deformable elastic element, actuated by low-pressure compressed air, to effect switching. The capability for remote operation (via a compressed air line) and the light weight of the valve (110 g) make the valve especially well suited to exercise stress testing studies. Two valves of this type have been satisfactorily used in graded exercise stress tests in a clinical setting for over 2 yr.
D002245:Carbon Dioxide / Q000502:physiology*; D002302:Cardiac Output; D006334:Heart Function Tests / Q000295:instrumentation*; D006801:Humans; D012119:Respiration
D002245:Carbon Dioxide