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J Appl Physiol 56: 1640-1646, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 56, Issue 6 1640-1646, Copyright © 1984 by American Physiological Society

ARTICLES

Ventilatory response to chronic metabolic acidosis and alkalosis in the dog

N. E. Madias, W. H. Bossert and H. J. Adrogue

Systematic data are not available with regard to the anticipated appropriate responses of arterial PCO2 to primary alterations in plasma bicarbonate concentration. In the present study, we attempted to rigorously characterize the ventilatory response to chronic metabolic acid-base disturbances of graded severity in the dog. Animals with metabolic acidosis produced by prolonged HCl feeding and metabolic alkalosis of three different modes of generation, i.e., diuretics (ethacrynic acid or chlorothiazide), gastric drainage, and administration of deoxycorticosterone acetate (alone or in conjunction with oral sodium bicarbonate), were examined. The results indicate the existence of a significant and highly predictable ventilatory response to chronic metabolic acid-base disturbances. Moreover, the magnitude of the ventilatory response appears to be uniform throughout a wide spectrum of chronic metabolic acid-base disorders extending from severe metabolic acidosis to severe metabolic alkalosis; on average, arterial PCO2 is expected to change by 0.74 Torr for a 1-meq/l chronic change in plasma bicarbonate concentration of metabolic origin. Furthermore, the data suggest that the ventilatory response to chronic metabolic alkalosis is independent of the particular mode of generation.


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Management of Life-Threatening Acid-Base Disorders- First of Two Parts
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