Summary
After successful pancreas transplantation, insulin-dependent diabetic patients are characterized by a normal or at worst impaired oral glucose tolerance (World Health Organisation criteria). It is not known which pathophysiological mechanisms cause the difference between normal and impaired oral glucose tolerance. Therefore, we studied 41 patients after successful combined pancreas-kidney transplantation using stimulation in the fasting state with oral glucose (75 g), intravenous glucose (0.33 g/kg) and glucagon bolus injection (1 mg i.v.). Glucose (glucose oxidase), insulin and C-peptide (immunoassay) were measured. Repeated-measures analysis of variance and multiple regression analysis were used to analyse the results which showed: 28 patients had a normal, and 13 patients had an impaired oral glucose tolerance. Impaired oral glucose tolerance was associated with a greatly reduced early phase insulin secretory response (insulin p<0.0001; C-peptide p=0.037). Age (p=0.65), body mass index (p=0.94), immunosuppressive therapy (cyclosporin A p=0.84; predniso(lo)ne p=0.91; azathioprine p=0.60) and additional clinical parameters were not different. Reduced insulin secretory responses in patients with impaired oral glucose tolerance were also found with intravenous glucose or glucagon stimulations. Exocrine secretion (α-amylase in 24-h urine collections) also demonstrated reduced pancreatic function in these patients (−46%; p=0.04). Multiple regression analysis showed a significant correlation of 120-min glucose with ischaemia time (p=0.003) and the number of HLA-DR mismatches (p=0.026), but not with HLA-AB-mismatches (p=0.084). In conclusion, the pathophysiological basis of impaired oral glucose tolerance after pancreas transplantation is a reduced insulin secretory capacity. Transplant damage is most likely caused by perioperative influences (ischaemia) and by the extent of rejection damage related, for example, to DR-mismatches.
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Abbreviations
- BMI:
-
Body mass index
- HLA:
-
human leucocyte antigen
- IGT:
-
impaired oral glucose tolerance
- NGT:
-
normal oral glucose tolerance
- RM-ANOVA:
-
repeated measures analysis of variance
- WHO:
-
World Health Organisation
- IDDM:
-
insulin-dependent diabetes mellitus
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Pfeffer, F., Nauck, M.A., Benz, S. et al. Determinants of a normal (versus impaired) oral glucose tolerance after combined pancreas-kidney transplantation in IDDM patients. Diabetologia 39, 462–468 (1996). https://doi.org/10.1007/BF00400678
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DOI: https://doi.org/10.1007/BF00400678