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Veno-arterial carbon dioxide gradient in human septic shock
J Bakker1, J L Vincent, P Gris
1Department of Intensive Care, Erasme University Hospital, Free University of Brussels, Belgium.
Chest
|February 1, 1992
Summary
Venous hypercarbia, indicated by a widened veno-arterial PCO2 difference (dPCO2), reflects hypoperfusion in septic shock. Higher dPCO2 levels correlate with poorer outcomes, influenced by cardiac output and pulmonary function.
Area of Science:
- Critical Care Medicine
- Physiology
- Pathophysiology
Background:
- Venous hypercarbia, measured as the veno-arterial PCO2 difference (dPCO2), is linked to systemic hypoperfusion in low-flow states.
- Septic shock, typically hyperdynamic, can have complex CO2 dynamics affecting dPCO2.
Purpose of the Study:
- To investigate the relationship between dPCO2, acid-base balance, and hemodynamic variables in septic shock patients.
- To determine the prognostic value of dPCO2 in septic shock outcomes.
Main Methods:
- Sixty-four adult patients with documented septic shock were studied.
- Measurements included dPCO2, acid-base balance, cardiac output, and oxygen-derived variables.
- A total of 191 observations were analyzed to establish correlations.
Main Results:
- A significant exponential relationship was found between dPCO2 and cardiac output (CO).
- Patients with increased dPCO2 exhibited lower cardiac index and higher oxygen extraction.
- Nonsurvivors had significantly higher dPCO2 than survivors, associated with higher lactate and pulmonary impairment.
Conclusions:
- In septic shock, dPCO2 is primarily related to cardiac output and pulmonary impairment.
- While higher dPCO2 is observed in nonsurvivors, its prognostic value is limited.