Abstract
The effects of strict metabolic control (multiple insulin injections for 1 week) on urinary albumin excretion, glomerular filtration rate and extracellular fluid volume was evaluated in long-term Type 1 diabetic patients with (n = 9) and without (n = 10) incipient nephropathy. Investigations were carried out in poor (blood glucose 15 (interquartile range, 13-18) mmol l-1) and good metabolic control (5 (4-8) mmol l-1). In patients with incipient nephropathy glomerular filtration rate was 125 (SD 26) (poor control) vs 125 (20) ml min-1 (good control), urinary albumin excretion 60 (range 37-247) vs 60 (13-359) mg 24 h-1, fractional albumin clearance 6.1 (0.9-67.6) vs 6.7 (2.1-65.4) x 10(-6), extracellular fluid volume 13.4 (2.3) vs 14.3 (2.8) l (p less than 0.10). Apart from an increase in extracellular fluid volume during improved metabolic control (12.2 (1.6) vs 13.6 (2.5) l, p less than 0.02) all the above mentioned variables remained unchanged in the patients with normal urinary albumin excretion. In conclusion, strict metabolic control for 2-7 days has no effect on urinary albumin excretion and glomerular filtration rate in long-term Type 1 diabetic patients with or without incipient diabetic nephropathy.
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