Calculating the insulin to carbohydrate ratio using the hyperinsulinaemic-euglycaemic clamp-a novel use for a proven technique.

Abstract:

BACKGROUND:In patients with type 1 diabetes, three main variables need to be assessed to optimize meal-related insulin boluses: pre-meal blood glucose (BG), insulin to carbohydrate ratio (I : C), and basal insulin. We are presenting data for a novel use of the hyperinsulinaemic-euglycaemic clamp (HEC) in patients with type 1 diabetes that minimizes the impact of these variables and can be used to determine the I : C. METHODS:Ten subjects (six men and four women) using continuous subcutaneous insulin infusion (CSII) pumps were recruited for this study [24-65 years; BMI 27.1 +/- 4.9 kg/m(2); A1C 7.2 +/- 1.4% (mean +/- SD)]. The HEC used a primed continuous intravenous insulin infusion of 40 mU/m(2)/min and a variable infusion of 20% glucose to maintain BG at 90 mg/dL. After subjects were in steady state (SS) for 50 min, a standardized meal (40% of total calories/day - 30% carbohydrate, 30% protein, 40% fat) was consumed. Subjects gave the insulin bolus with their CSII pump. No changes were made in the glucose infusion rate. RESULTS:Mean BG at SS was 85.7 +/- 10.4 mg/dL. Peak BG was 115.0 +/- 12.7 mg/dL at 68.5 +/- 8.8 min after the meal. Mean I : C was 1 : 9.3 +/- 1.7 (range 1 : 7-1 : 12). Insulin sensitivity varied from 1.9 to 9.1 mg/kg/min. CONCLUSIONS:The HEC can be used to reduce confounding factors and to determine the I : C. As a first estimate of the I : C in patients with type 1 diabetes, it is recommended to start with a ratio of 1 : 9.3 and to measure post-prandial BG at 70 min.

journal_name

Diabetes Metab Res Rev

authors

Bevier WC,Zisser H,Palerm CC,Finan DA,Seborg DE,Doyle FJ,Wollitzer AO,Jovanovic L

doi

10.1002/dmrr.727

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

472-8

issue

6

eissn

1520-7552

issn

1520-7560

journal_volume

23

pub_type

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