PMID: 2492409Feb 1, 1989Paper

Physiologic dead space, venous admixture, and the arterial to end-tidal carbon dioxide difference in infants and children undergoing cardiac surgery

Anesthesiology
F A Burrows

Abstract

End-tidal CO2 (PETCO2), arterial CO2 (PaCO2), mixed expired CO2 (PECO2), arterial and mixed venous oxygen contents were measured and the PaCO2 to PETCO2 difference (delta PCO2), physiologic dead space to tidal volume ratios (VD/VT) and venous admixture (Qs/Qt) were calculated in 41 anesthetized infants and children undergoing repair of congenital cardiac lesions. Eighteen children were acyanotic; 9 with normal pulmonary blood flow (PBF) and normal intracardiac anatomy (normal group); and 9 with increased PBF (acyanotic group). Twenty-three children were cyanotic; 14 with right to left intracardiac shunts and decreased PBF (cyanotic (D) group); and 9 with mixing lesions with normal or increased PBF (cyanotic (I) group). Correlations between PaCO2 and PETCO2 in the four groups of children were carried out and the relationship of delta PCO2 to VD/VT and Qs/Qt was determined. PETCO2 correlated closely with the PaCO2 in the normal and acyanotic groups (r2 = 0.97 and 0.91, respectively) and the lines of regression for the relationship between PaCO2 and PETCO2 for both groups did not differ from the line of identity (P less than or equal to 0.05). Mean +/- SD VD/VT for the normal and acyanotic groups were 0.35 +/- 0.17 and 0.39 +/- 0....Continue Reading

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