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Diabetes, Vol 34, Issue 12 1260-1265, Copyright © 1985 by American Diabetes Association

ARTICLES

Insulin clearance contributes to the variability of nocturnal insulin requirement in insulin-dependent diabetes mellitus

S Dux, NH White, DA Skor and JV Santiago

We have previously described, in insulin-dependent diabetic subjects (IDDM), a small, but significant, increase in the insulin clearance rate (ICR) during 0600-0800 h as compared with 0100-0300 h. To determine whether this increase was also seen at more physiologic levels of insulin replacement, we calculated ICR during euglycemic clamp studies in 13 patients with IDDM with a constant infusion of insulin at 20 mU/min/m2 and during insulin replacement from the Biostator GCIIS without exogenous glucose. During the euglycemic clamp study with constant insulin infusion at 20 mU/min/m2, the ICR was 16% higher at 0600-0800 h than at 0100-0300 h (264 +/- 50 ml/min/m2 versus 228 +/- 51 ml/min/m2; P less than 0.005). During insulin replacement by the Biostator, the mean insulin infusion rate increased by 92 +/- 27% (7.5 +/- 1.1 to 13.5 +/- 1.2 mU/min/m2; P less than 0.001) and ICR increased by 123 +/- 30% (130 +/- 24 to 268 +/- 51 ml/min/m2; P less than 0.01) during the prebreakfast period when compared with 0100-0300 h. There was a highly significant correlation (r = 0.97) between the increment in insulin infusion rate and the increment in ICR. Measurement of insulin concentration in saline solutions, delivered by the Biostator at a same rate and under similar conditions to those in this study, showed that insulin delivery was stable for the 8-h period of this study.(ABSTRACT TRUNCATED AT 250 WORDS)
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