Journal of Applied Physiology AJP: Cell Physiology
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J Appl Physiol 52: 851-856, 1982;
8750-7587/82 $5.00
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Journal of Applied Physiology, Vol 52, Issue 4 851-856, Copyright © 1982 by American Physiological Society

ARTICLES

Effect of nitroglycerin on DL of normal subjects at rest and during exercise

B. Nemery, L. Piret, L. Brasseur and A. Frans

By use of the single-breath diffusing capacity for carbon monoxide (DL) as an index of the pulmonary capillary filling, the effects of 3 mg sublingual nitroglycerin (NTG) were studied in eight healthy subjects at rest and during exercise. At rest, NTG induced a significant and persistent decrease of DL when subjects were sitting or supine (60 min of observation) and also when they were in the lateral decubitus or supine with legs up position (30 min of observation). Subjects in the supine positions showed more pronounced percentage decreases in DL than when sitting. In the sitting position 1 mg NTG also induces a decrease of DL. During a moderate upright cycloergometer exercise, NTG also induces a significant decrease of DL; the decrease is smaller and of shorter duration (less than 15 min) than at rest, but it reappears as soon as the exercise is stopped. The decrease of DL may be attributed to an outward shift of blood from the thorax to the periphery or to a redistribution of lung perfusion consequent to changes in pulmonary vascular pressures.


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