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Arterial-venous differences across the lungs in plasma triglyceride concentration
Respiration; International Review of Thoracic Diseases
|January 1, 1977
Summary
The lungs retain about 20% of infused soybean oil emulsion triglycerides during intravenous administration in healthy humans. This indicates a significant pulmonary uptake of plasma triglyceride during lipid emulsion infusion.
Area of Science:
- Cardiovascular physiology
- Lipid metabolism
- Pulmonary function
Background:
- Plasma triglyceride levels are crucial indicators of cardiovascular health.
- The lungs' role in systemic lipid processing is not fully understood.
- Intravenous lipid emulsions are commonly used in clinical nutrition.
Purpose of the Study:
- To investigate arterial-venous differences in plasma triglyceride across the lungs.
- To quantify the lungs' capacity to retain or metabolize infused lipids.
- To understand the pulmonary handling of soybean oil emulsion.
Main Methods:
- Healthy human subjects were studied before, during, and after intravenous infusion of a soybean oil emulsion.
- Blood samples were collected from the pulmonary artery and brachial artery.
- Plasma triglyceride concentrations were measured in arterial and venous samples.
Main Results:
- A significant increase in plasma triglyceride concentration was observed in venous blood compared to arterial blood after 12 minutes of infusion (p < 0.001).
- The lungs retained approximately 20% of the infused triglyceride, equating to 3 mmol/min.
- A trend suggested lipid release from the lungs during the post-infusion period.
Conclusions:
- The lungs play a significant role in the retention of plasma triglyceride during intravenous lipid emulsion infusion.
- Pulmonary uptake of lipids may be a factor in managing hypertriglyceridemia.
- Further research is warranted to elucidate the precise mechanisms of pulmonary lipid handling.