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Pulmonary dysfunction in sepsis: is pulmonary edema the culprit?
The Journal of Trauma
|April 1, 1982
Summary
Sepsis increases extravascular lung water (EVLW) and intrapulmonary shunt (Qs/Qt), but elevated EVLW alone doesn't fully explain the increased Qs/Qt in sepsis.
Area of Science:
- Critical Care Medicine
- Pulmonary Physiology
- Sepsis Pathophysiology
Background:
- Sepsis frequently leads to pulmonary dysfunction.
- Intrapulmonary shunt (Qs/Qt) and extravascular lung water (EVLW) are key metrics for assessing lung injury.
Purpose of the Study:
- To investigate the relationship between Qs/Qt and EVLW in a sepsis model.
- To determine if increased EVLW adequately explains the elevated Qs/Qt observed in sepsis.
Main Methods:
- Sepsis was induced in pigs using live E. coli infusion.
- Serial measurements included pulmonary artery pressure, pulmonary artery wedge pressure, arterial blood gases, mixed venous blood gases, Qs/Qt, and EVLW.
- The thermal-green dye technique was used for EVLW measurement.
Main Results:
- Septic pigs showed significant increases in pulmonary artery pressure (2.4x), EVLW (2x), and Qs/Qt (1.6x) compared to baseline.
- Regression analysis revealed a correlation coefficient (r) of 0.48 between Qs/Qt and EVLW.
- The correlation was not strong enough to attribute the increased Qs/Qt solely to elevated EVLW.
Conclusions:
- Sepsis is associated with increases in both EVLW and Qs/Qt.
- Elevated EVLW alone does not fully account for the observed increase in intrapulmonary shunt during sepsis.
- Other factors like hypoxemia, pulmonary edema, ventilation-perfusion mismatch, and altered hypoxic vasoconstriction may contribute to sepsis-induced pulmonary dysfunction.