[Parietal cell ultrastructure and acid secretory function before and after vagotomy]

Area of Science:

• Gastroenterology
• Surgical Oncology
• Cell Biology

Background:

• Duodenal ulcers are commonly treated with surgical interventions.
• Vagotomy, a surgical procedure involving the vagus nerve, is a key treatment for duodenal ulcers.
• Understanding the long-term effects of different vagotomy techniques on gastric physiology is crucial.

Purpose of the Study:

• To investigate the ultrastructural changes in parietal cells following vagotomy.
• To evaluate the impact of vagotomy on gastric acid secretion and serum gastrin levels.
• To compare the long-term effects of highly selective vagotomy (HSV) versus truncal vagotomy with antrectomy (SV+A).

Main Methods:

• Electron microscopy of gastric parietal cells.
• Gastric acid secretory tests.
• Serum gastrin level evaluation before and after vagotomy in 238 patients.

Main Results:

• Vagotomy induced secretory depression in parietal cells, decreasing gastric acid output within 2-6 weeks.
• Highly selective vagotomy (HSV) showed gradual recovery of parietal cell morphology and increased gastrin levels over 1-10 years, with sustained low acid output.
• Truncal vagotomy with antrectomy (SV+A) resulted in persistent ultrastructural changes, low gastric acid output, and low serum gastrin levels.

Conclusions:

• Vagotomy alters parietal cell function, explaining reduced gastric acid output post-surgery.
• The findings provide a theoretical basis for using vagotomy in duodenal ulcer treatment.
• Different vagotomy techniques have distinct long-term physiological impacts on gastric function.