Gastric and esophageal intramucosal PCO2 (PiCO2) during endotoxemia: assessment of raw PiCO2 and PCO2 gradients as indicators of hypoperfusion in a canine model of septic shock.

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 PCO2 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.

journal_name

Chest

journal_title

Chest

authors

Guzman JA,Lacoma FJ,Kruse JA

doi

10.1378/chest.113.4.1078

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

1078-83

issue

4

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(15)47450-1

journal_volume

113

pub_type

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