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Ann Thorac Surg 1991;51:534-540
© 1991 The Society of Thoracic Surgeons

Articles

Prolonged pumpless arteriovenous perfusion for carbon dioxide extraction

John A. Awad, MD, PhD*,a,b,c, Jean Deslauriers, MDa,b,c, Diane Major, BSca,b,c, Liu Guojin, MDa,b,c, Louisette Martin, RNa,b,c

a Department of Surgery and Laboratory of Experimental Surgery, Faculty of Medicine, Laval University Ste-Foy, Québec, Canada
b Laval University Hospital Center Ste-Foy, Québec, Canada
c Thoracic Surgery Division, Centre de Pneumologie de Laval, Ste-Foy, Québec, Canada

* Address reprint requests to Dr Awad, Centre Hospitalier de l'Université Laval, bur: 2211, 2705 Boulevard Laurier, Ste-Foy, Qué, Canada GIV 4G2.

A method of extracorporeal carbon dioxide extraction from the blood using an efficient microporous membrane oxygenator or membrane gas exchanger was evaluated during pumpless arteriovenous perfusions with a view to its application for partial respiratory support. The first study carried out in dogs revealed some increase in cardiac output, cardiac index, and cardiac work, although this increase was less than that normally expected from the added extracorporeal blood flow. In sheep during 3 to 7 days of continuous bypass, there was practically no hemolysis and relatively stable hemoglobin and hematocrit levels, and the platelet counts remained within safe levels. The maximum extracorporeal blood flow tended to decrease from a mean of 1.55 L/min on day 1 to 1.34 L/min on day 3 to 1.28 L/min on day 7. Carbon dioxide extraction remained efficient throughout the perfusion, but there was a minimal decrease from the first day (10.92 mmol/L) to the third day (8.46 mmol/L) at the higher blood carbon dioxide concentrations; it remained stable thereafter at 9.0 mmol/L.




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