Gastric and Esophageal Intramucosal PCO sub 2 (PiCO sub 2) During Endotoxemia*: Assessment of Raw PiCO sub 2 and PCO sub 2 Gradients as Indicators of Hypoperfusion in a Canine Model of Septic Shock

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Abstract

Study objectives

To validate capnometric recirculating gas tonometry (CRGT) for continuously monitoring gut intramucosal PCO2 (PiCO2) in a septic shock model, and to compare gastric vs esophageal PCO2 vs intramucosal-arterial PCO sub 2 gradients.

Interventions

CRTG catheters were placed in the stomach and esophagus of six anesthetized dogs. A saline solution filled balloon tonometry (ST) catheter was also placed in the stomach. After equilibration, 3 mg/kg Escherichia coli lipopolysaccharide (LPS) was administered IV. PiCO2 measurements were made at 0, 45, and 90 min post-LPS by ST and continuously by CRGT.

Results

Baseline PiCO2 was 41.5 +/- 1.9 (+/- SE) in the stomach by CRGT, 38.0 +/- 1.0 by ST, and 43.0 +/- 4.4 mm Hg in the esophagus (p=not significant). Gastric PiCO2 by CRGT increased to 47.0 +/- 2.4 mm Hg by 25 min post-LPS (p<0.05), whereas gastric (ST) and esophageal PiCO2 increased significantly by 45 min post-LPS. Good agreement was observed between gastric CRGT and ST measurements (mean bias, 1.3 mm Hg). The PiCO2-PaCO2 gradient increased post-LPS, but was significant only for gastric CRGT measurements 90 min post-LPS infusion.

Conclusion

CRGT provided continuous gastric PiCO2 measurements that were in close agreement with ST but detected changes earlier than the conventional technique. Continuous esophageal PiCO2 represents a valid alternative for assessing gastric PiCO2.

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