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Chest, Vol 99, 1438-1443, Copyright © 1991 by American College of Chest Physicians

ARTICLES

Independent oxygen uptake and oxygen delivery in septic and postoperative patients

CG Vermeij, BW Feenstra, WJ Adrichem and HA Bruining
Department of General Surgery, University Hospital Dijkzigt, Rotterdam, The Netherlands.

Previous studies reporting pathologic oxygen supply dependency calculated VO2 as CO x C(a-v)O2. We investigated whether pathologic oxygen supply dependency exists in septic and postoperative patients if VO2 and DO2 are assessed independently. In septic patients, VO2 was 164 +/- 31 and DO2 was 633 +/- 209 ml/min/m2. The slope (b) of the VO2-DO2 regression line VO2 = b x DO2 + a ranged from -0.10 to 0.08 (mean, 0.02 +/- 0.01, p less than 0.05) and was statistically significant in two patients (b = 0.05 and b = 0.08, p less than 0.05). In postoperative patients VO2 was 136 +/- 19 and DO2 was 481 +/- 160 ml/min/m2; b ranged from -0.07 to 0.09 (mean, 0.04 +/- 0.01, p less than 0.001) and was statistically significant in one patient (b = 0.09, p less than 0.01). The lack of a close relationship between independently measured VO2 and DO2 may indicate that septic and postoperative patients in stable hemodynamic condition have no pathologic oxygen supply dependency. Analysis of the VO2-DO2 relationship may not be useful to guide therapy or predict outcome.


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