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Chest, Vol 97, 1130-1136, Copyright © 1990 by American College of Chest Physicians
ARTICLES |
S Miyoshi, EP Trulock, HJ Schaefers, CM Hsieh, GA Patterson and JD Cooper
Division of Thoracic Surgery, Toronto General Hospital, Faculty of Medicine, University of Toronto, Ontario, Canada.
The cardiopulmonary response to exercise was investigated in six single and six double lung transplant recipients using a three-minute incremental work rate protocol on a cycle ergometer. Maximum VO2 averaged 44.2 +/- 9.2 percent and 48.5 +/- 5.0 percent of predicted maximal VO2 in the single and double lung transplant groups, respectively. No evidence of ventilatory limitation to exercise was found in either group. Circulatory factors that may have limited exercise capacity included anemia and submaximal heart rates. There was a strong correlation between VO2/kg at venous blood lactate level of 2.2 mEq/L and vital capacity/body surface area in the single, but not in the double, lung recipients. Maximum VO2 in these lung transplant recipients was comparable to previously published values in heart-lung transplant recipients. The factors that limit maximum exercise capacity after lung transplantation deserve further study.
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