Gastrointestinal Nutrient Transit and Enteroendocrine Function After Upper Gastrointestinal Surgery

50mcg octreotide acetate by subcutaneous injection 10 minutes prior to a 400kcal mixed meal challenge

Equivalent volume of 0.9% saline by subcutaneous injection 10 minutes prior to a 400kcal mixed meal challenge

Paracetamol 1g by mouth consumed with a 400kcal mixed meal challenge

1g sulfasalazine by mouth consumed with a 400kcal mixed meal challenge

Biopsy from the second part of the duodenum taken at routine endoscopic surveillance, undertaken for another clinical indication.