Systemic appearance of nutrients placed into the peritoneal cavity

Area of Science:

• Biomedical Science
• Physiology
• Nutritional Science

Background:

• The peritoneal cavity is a potential route for nutrient delivery.
• Previous studies demonstrated dogs could be sustained for 30 days via continuous peritoneal infusion of amino acids, glucose, and lipids.

Purpose of the Study:

• To compare nutrient absorption rates between the gut and peritoneal cavity.
• To investigate the absorption rates of amino acids, sugars, and fats from the peritoneal cavity.
• To assess the absorption of glucose polymers from the peritoneal cavity.

Main Methods:

• Utilized a dog model to study nutrient absorption.
• Compared the absorption rates of D-xylose (a sugar) from the gut versus the peritoneal cavity.
• Administered glucose, amino acids, lipids, and glucose polymers intraperitoneally and intravenously to assess systemic circulation.

Main Results:

• D-xylose absorption was faster via the peritoneal cavity than the gut.
• Amino acid absorption rates were similar for both routes.
• Lipids showed a delayed appearance (2.5 hours) in systemic circulation after peritoneal administration.
• Intraperitoneal glucose polymers resulted in a lower, more sustained serum glucose increase compared to plain glucose.

Conclusions:

• The peritoneal cavity efficiently transports glucose, amino acids, and glucose polymers into systemic circulation.
• Lipid transport via the peritoneal cavity is significantly slower.
• The peritoneal route is a viable option for nutritional support, requiring further studies on optimal concentrations and delivery rates.