Modification of postprandial hyperglycemia with insulin lispro improves glucose control in patients with type 2 diabetes.
OBJECTIVE
Insulin lispro is a rapid-acting analog of human insulin that can be used to target the postprandial rise in plasma glucose. We designed an open-label randomized crossover study of type 2 diabetic patients with secondary failure of sulfonylurea therapy to determine whether improvement of postprandial hyperglycemia would affect total daily glucose control.


METHODS
Twenty-five type 2 diabetic patients who were poorly controlled on a maximum dose of sulfonylureas were studied in a university hospital clinical research center. In one arm of the study, patients continued therapy with maximum-dose sulfonylureas. In the other arm, patients used a combination therapy with insulin lispro before meals and sulfonylureas. After 4 months, patients were crossed over to the opposite arm. Fasting plasma glucose (FPG) and 1- and 2-h postprandial glucose (after a standardized meal), HbA1c, total, HDL, and LDL cholesterol, and triglyceride levels were measured at the end of each arm of the study.


RESULTS
Insulin lispro in combination with sulfonylurea therapy significantly reduced 2-h postprandial glucose concentrations compared with sulfonylureas alone, from 18.6 to 14.2 mmol/l (P < 0.0001), and incremental postprandial glucose area from 617.8 to 472.9 mmol.min.1-1 (P < 0.0007). FPG levels were decreased from 10.9 to 8.5 mmol/l (P < 0.0001), and HbA1c values were reduced form 9.0 to 7.1% (P < 0.0001). Total cholesterol was significantly decreased in the lispro arm from 5.44 to 5.10 mmol/l (P < 0.02). HDL cholesterol concentrations were increased in the lispro arm from 0.88 to 0.96 mmol/l (P < 0.01). The patients weighed significantly more after lispro therapy than after sulfonylureas alone, but the difference was small in absolute terms (sulfonylurea therapy alone, 90.6 kg; lispro therapy, 93.8 kg; P < 0.0001). Two episodes of hypoglycemia (glucose concentrations, < 2.8 mmol/l) were reported by the patients while using lispro.


CONCLUSIONS
Previously, it has not been possible to address the effect of treatment of postprandial hyperglycemia specifically. We have now shown that the treatment of postprandial hyperglycemia with insulin lispro markedly improves overall glucose control and some lipid parameters in patients with type 2 diabetes.
Feinglos
M N
MN
Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710, USA. feing002@mc.duke.edu
Thacker
C H
CH
English
J
J
Bethel
M A
MA
Lane
J D
JD
D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000187:drug effects* / Q000378:metabolism; D002096:C-Peptide / Q000097:blood; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000188:drug therapy*; D005260:Female; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use*; D007328:Insulin / Q000031:analogs & derivatives* / Q000627:therapeutic use; D061268:Insulin Lispro; D008297:Male; D008875:Middle Aged; D019518:Postprandial Period; D013453:Sulfonylurea Compounds / Q000627:therapeutic use; D014280:Triglycerides / Q000097:blood
D001786:Blood Glucose; D002096:C-Peptide; D008076:Cholesterol, HDL; D007004:Hypoglycemic Agents; D007328:Insulin; D061268:Insulin Lispro; D013453:Sulfonylurea Compounds; D014280:Triglycerides; D002784:Cholesterol