Changes in apolipoprotein and lipids in patients after surgery

Area of Science:

• Biochemistry
• Clinical Nutrition
• Surgical Metabolism

Background:

• Gastrointestinal surgery significantly impacts patient metabolism.
• Nutritional support, particularly intravenous dextrose, is common post-surgery.
• Apoproteins are crucial components of lipoprotein metabolism.

Purpose of the Study:

• To investigate changes in plasma apoprotein levels (A-I, A-II, B) after gastrointestinal surgery.
• To assess the influence of surgery type (major vs. minor) and caloric restriction on apoprotein and lipid profiles.
• To evaluate the potential of apoprotein levels as a marker for patient recovery.

Main Methods:

• Plasma samples collected from 43 patients (14 male, 29 female) between days 2-6 post-surgery.
• Patients received only intravenous 5% dextrose solutions.
• Measurements included apoprotein A-I, A-II, B, total cholesterol, HDL-cholesterol, and phospholipids.

Main Results:

• Significant decreases observed in apoprotein A-I, A-II, B, total cholesterol, HDL-cholesterol, and phospholipids post-surgery.
• No significant sex-based differences in apoprotein or lipid levels were found.
• Major surgery patients exhibited markedly lower levels compared to minor surgery patients.

Conclusions:

• Caloric restriction and surgical trauma likely contribute to reduced apoprotein and lipid levels.
• Decreased hepatic synthesis and lack of intestinal supply may cause apo A-I and A-II reduction.
• Repeated apoprotein level measurements can serve as a valuable tool for monitoring recovery post-gastrointestinal surgery.