Abstract:
AIMS/HYPOTHESIS:Type I (insulin-dependent) diabetes mellitus is associated with an increased extracellular volume. Sodium restriction might seem a logical form of treatment but data on its renal effects is conflicting. We therefore studied the effects of sodium restriction on renal haemodynamics in uncomplicated Type I diabetes mellitus. METHODS:Uncomplicated Type I diabetic patients ( n = 24) and matched control subjects ( n = 24) were studied twice in random order: after a week of 50 mmol or after 200 mmol sodium intake, respectively. The diabetic patients were studied under normoglycaemic clamp conditions. Glomerular filtration rate and effective renal plasma flow were measured as the clearances of iothalamate and hippuran, respectively. RESULTS:During liberal sodium intake, glomerular filtration, effective renal plasma flow and filtration fraction were similar between the diabetic patients and the control subjects. Sodium restriction decreased the effective renal plasma flow in both groups, whereas glomerular filtration rate only decreased in the control subjects. Consequently, in the diabetic patients, the filtration fraction was increased on low sodium (4.1 +/- 8.4 %, p < 0.05 vs liberal sodium). As a consequence, filtration fraction (24.0 +/- 2.6 vs 22.1 +/- 2.0 %, p < 0.05) and glomerular filtration (119 +/- 14 vs 110 +/- 13 ml/min, p < 0.05) were higher in the diabetic patients than in the control subjects during sodium restriction. CONCLUSION/INTERPRETATION:Short-term moderate sodium restriction induces relative hyperfiltration in uncomplicated Type I diabetes. This could indicate an increased intraglomerular pressure. Sodium restriction could be an unfavourable preventive approach in diabetes mellitus but its long-term effects are not known.
journal_name
Diabetologiajournal_title
Diabetologiaauthors
Luik PT,Hoogenberg K,Van Der Kleij FG,Beusekamp BJ,Kerstens MN,De Jong PE,Dullaart RP,Navis GJdoi
10.1007/s00125-001-0763-8subject
Has Abstractpub_date
2002-04-01 00:00:00pages
535-41issue
4eissn
0012-186Xissn
1432-0428journal_volume
45pub_type
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