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[Hypo- and hyperventilation: consequences for acid-base balance].
Deviations of the alveolar ventilation rate from normality induce respiratory acid-base disturbances. Alveolar hyperventilation leads to hypocapnia and thus respiratory alkalosis whereas alveolar hypoventilation induces hypercapnia leading to respiratory acidosis. The changes in CO2 induce compensatory alterations of renal bicarbonate transport: Hypercapnia stimulates renal reabsorption of bicarbonate whereas hypocapnia enhances urinary bicarbonates. The plasma bicarbonate concentration rises in response to hypercapnia and falls following hypocapnia. Renal regulation of plasma bicarbonate results in a characteristic dependence on systemic PCO2 permitting the formation of diagnostic criteria for respiratory imbalance of acid-base homeostasis. In chronic respiratory acidosis plasma bicarbonate should rise by 0.35 mmol/l per mmHg increase in PCO2. In chronic respiratory alkalosis, on the other hand, plasma bicarbonate should fall by 0.4 mmol/l for every mmHg decrease in PCO2. If the measured bicarbonate values do not fall into this expected range, acute respiratory or mixed (respiratory and metabolic) acid-base disturbances should be suspected. The clinical significance and application of these diagnostic criteria are illustrated by examples.
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