Measuring the efficiency of an artificial lung: 1. Carbon dioxide transfer.
The performance of a hollow fibre artificial lung ('Capiox E') was analysed by measurement of the 'parallel deadspace' of the device under varying conditions in 21 patients. The efficiency with which carbon dioxide was exchanged was determined by the time available for equilibration between the blood and gas phases. When this equilibration coefficient was less than 12 seconds per litre of blood flow per litre of gas flow, there was a marked reduction in the efficiency of gas exchange. Under certain conditions, the 'counter-current' design of the device apparently permitted the clearance of carbon dioxide at a partial pressure greater than that which was found in the mixed venous blood. This anomalous behaviour may represent in vivo confirmation of the Haldane effect.
Pybus
D A
DA
Department of Perfusion, St. George Hospital, Sydney, New South Wales, Australia.
Lyon
M
M
Hamilton
J
J
Henderson
M
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000399:Air Pressure; D001783:Blood Flow Velocity; D001831:Body Temperature; D002245:Carbon Dioxide / Q000097:blood / Q000737:chemistry* / Q000378:metabolism; D006348:Cardiac Surgical Procedures; D004526:Efficiency; D006801:Humans; D008875:Middle Aged; D010100:Oxygen / Q000008:administration & dosage; D010106:Oxygenators; D011659:Pulmonary Gas Exchange; D012126:Respiratory Dead Space; D012212:Rheology; D014692:Ventilation-Perfusion Ratio
D002245:Carbon Dioxide; D010100:Oxygen