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Cardiovascular Events and Correlates in the Veterans Affairs Diabetes Feasibility Trial Veterans Affairs Cooperative Study on Glycemic Control and Complications in Type II Diabetes

Carlos Abraira, MD; John Colwell, MD, PhD; Frank Nuttall, MD, PhD; Clark T. Sawin, MD; William Henderson, PhD; John P. Comstock, MD; Nicholas V. Emanuele, MD; Seymour R. Levin, MD; Ivan Pacold, MD; Hae Sook Lee
Arch Intern Med. 1997;157(2):181-188. doi:10.1001/archinte.1997.00440230053007.
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Background:  The risks and benefits of intensive therapy in non—insulin-dependent diabetes mellitus (NIDDM) need to be defined. In preparation for a long-term trial, a feasibility study of 153 men in 5 medical centers compared standard vs intensive insulin therapy.

Objective:  To assess the rate of development of new cardiovascular events and their correlates.

Methods:  Patients with a mean ± SD age of 60 ± 6 years and diagnosis of NIDDM for 7.8±4.0 years were randomly assigned to a standard (1 insulin injection every morning) or to an intensive treatment arm (stepped plan from 1 evening injection of insulin, alone or with glipizide, to multiple daily injections) designed to attain near-normal glycemia levels. A 2.07% separation of glycosylated hemoglobin (HbA1c) was sustained for a mean follow-up of 27 months (P<.001). Predefined cardiovascular events were assessed by a committee unaware of treatment assignment.

Results:  Mild and moderate hypoglycemic events were more frequent in the intensive than in the standard treatment arm (16.5 vs 1.5 per patient per year, respectively). Mean insulin dose was 23% lower in the standard treatment arm (P<.001). There were 61 new cardiovascular events in 24 patients (32%) in the intensive treatment arm and in 16 patients (20%) in the standard treatment arm (P=.10). There was no difference in total and cardiovascular mortality (n=5 and n=3 in the intensive and standard treatment arms, respectively) or in new events in patients with cardiovascular history (n=10 in each arm). In Cox regression analysis, the only significant correlate for new cardiovascular events was previous cardiovascular disease (P=.04). Entering in the analysis any baseline cardiovascular abnormality, the regression model indicated a lower HbA1c level prior to the event as the only correlate for new cardiovascular events (P=.05).

Conclusion:  A long-term prospective trial is needed to assess the risk-benefit ratio of intensive insulin therapy for NIDDM in patients who require it.Arch Intern Med. 1997;157:181-188


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