PMID: 8599278Jan 1, 1995Paper

Permissive hypercapnia in ARDS and its effect on tissue oxygenation

Acta Anaesthesiologica Scandinavica. Supplementum
K G Hickling, C Joyce

Abstract

Many experimental studies have shown that mechanical ventilation with high tidal volumes (Vt) or with a low end-expiratory volume allowing repeated end-expiratory collapse, can result in acute parenchymal lung injury and probably an inflammatory response. Low volume ventilation with permissive hypercapnia has been used in an attempt to avoid such injury in ARDS. Such management can affect oxygenation in many complex ways. The right-shift of the haemoglobin-oxygen dissociation curve during acute respiratory acidosis may increase venous oxygen tension (PvO2) which could allow increased O2 uptake in ischaemic tissues. Acidosis may reduce intrapulmonary shunt (Qs/Qt) by potentiating hypoxic pulmonary vasoconstriction, and there may also be direct and autonomically mediated effects of hypercapnia both on the lung vasculature and on the airways. Cardiac output usually increases as a consequence of hypercapnia and perhaps as a result of reduced intrathoracic pressure, further increasing PvO2 and CvO2, but the increase in cardiac output (CO) may tend to increase Qs/Qt as flow increases preferentially in unventilated lung. The reduction of mean airway pressure may directly increase Qs/Qt. Hypercapnia may affect the distribution of syste...Continue Reading

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