Abstract
Microvascular fluid permeability was assessed by determination of the capillary filtration coefficient in the forearm of ten young Type 1 (insulin-dependent) diabetic patients with a short duration of diabetes, satisfactory glycaemic control and minimal evidence of microangiopathy, and ten age- and sex-matched control subjects. A strain gauge plethysmographic method with a computer based logging and analysis system was used. This enabled differentiation between the volume filling and fluid filtration components of the response to venous pressure elevation. The median capillary filtration coefficient was found to be significantly higher in the young diabetic patients in comparison with control subjects (9.2 x 10(-3) ml.min-1.100 g tissue-1.mmHg-1 vs 3.8 x 10(-3) ml.min-1.100 g tissue-1.mmHg-1, p < 0.001). There were no significant correlations between capillary filtration coefficient and either plasma glucose concentration, haemoglobin A1c or duration of diabetes. As there is no evidence from other studies to support an increase in capillary surface area in the forearms of young Type 1 diabetic patients, these results may reflect a primary change in microvascular fluid permeability.
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