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With current surgical techniques for pancreatic transplantation, the graft is anastomosed to the iliac vessels, resulting in delivery of insulin to the systemic circulation rather than to the portal vein as in healthy man. The possible influence of the altered route of insulin delivery on the regulation of splanchnic glucose metabolism was studied in four patients with Type 1 (insulin-dependent) diabetes mellitus at 6-19 months after combined pancreatic and kidney transplantation. Four non-diabetic, age-matched renal transplant recipients and two groups of age-matched healthy subjects served as controls. The studies were carried out in the basal state and during two rates of intravenous glucose infusion (2 and 4 mg.kg-1.min-1). Fasting arterial glucose and splanchnic glucose output was similar in all groups. Basal hyperinsulinaemia was present in pancreatic graft recipients compared to healthy subjects. During low rate intravenous glucose infusion splanchnic glucose output decreased to a similar extent in all groups. With the higher glucose infusion rate (4 mg.kg-1.min-1) a net glucose uptake was observed which was similar in all three groups. Peripheral glucose uptake was unchanged at the lower glucose infusion rate but increased by 45-55% at the higher rate. It is concluded that despite systemic insulin delivery from a heterotopic pancreatic graft, hepatic glucose metabolism appears normal both in the post-absorptive state and in response to glucose-stimulated endogenous insulin secretion. Portal insulin delivery is thus not necessary for normal hepatic glucose metabolism in the Type 1 diabetic patient.

diabetologia

Normalization of hepatic glucose regulation despite systemic insulin delivery. Studies in patients with pancreatic transplantation for Type 1 (insulin-dependent) diabetes mellitus