Diabetes Care, Vol 20, Issue 4 632-636, Copyright © 1997 by American Diabetes Association
Effect of long-acting somatostatin analog (Somatulin) on renal hyperfiltration in patients with IDDM
ML Jacobs, FH Derkx, T Stijnen, SW Lamberts and RF Weber
Department of Internal Medicine III, University Hospital Dijkzigt, Rotterdam, The Netherlands.
OBJECTIVE: To investigate whether long-acting somatostatin (SMS) can
suppress renal hyperfiltration in patients with IDDM. RESEARCH DESIGN AND
METHODS: A double-blind, randomized treatment of nine patients with IDDM
was used. Selection criteria were renal hyperfiltration (glomerular
filtration rate [GFR] > or = 129 ml.min-1.1.73 m2) and absence of
hypertension and macroalbuminuria. Treatment was either with a long-acting
SMS analog (Somatulin, 30 mg) or with placebo, given by intramuscular
injections every 10 days for 9 months. GFR, effective renal plasma flow
(ERPF), IGF-I, and 24-h growth hormone (GH) profiles were used as
evaluation parameters. RESULTS: Five patients were randomized to Somatulin,
four patients to placebo. One of the patients treated with Somatulin
stopped after 3 months because of persistent abdominal discomfort after the
injections. Somatulin treatment for 3 months lowered GFR and ERPF compared
with placebo (P < 0.05). After 9 months, the differences were no longer
significant. After 3 months, IGF-I concentrations were decreased in all
Somatulin-treated patients. GH secretion tended to increase in the placebo
group. CONCLUSIONS: The administration of long-acting Somatulin to patients
with IDDM and renal hyperfiltration leads to only a temporary reduction of
ERPF/GFR.