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Original Article
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Volume 329:304-309 July 29, 1993 Number 5
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The Effect of Long-Term Intensified Insulin Treatment on the Development of Microvascular Complications of Diabetes Mellitus
Per Reichard, Bengt-Yngve Nilsson, and Urban Rosenqvist

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ABSTRACT

Background A cause-and-effect relation between blood glucose concentrations and microvascular complications in patients with insulin-dependent diabetes mellitus has not been established.

Methods We randomly assigned 102 patients with insulin-dependent diabetes mellitus, nonproliferative retinopathy, normal serum creatinine concentrations, and unsatisfactory blood glucose control to intensified insulin treatment (48 patients) or standard insulin treatment (54 patients). We then evaluated them for microvascular complications after 18 months and 3, 5, and 7.5 years.

Results Mean (±SD) glycosylated hemoglobin values were reduced from 9.5 ±1.3 percent to 7.1 ±0.7 percent in the group receiving intensified treatment and from 9.4 ±1.4 percent to 8.5 ±0.7 percent in the group receiving standard treatment (P = 0.001). In 12 of the patients receiving intensified treatment (27 percent of those included in the analysis) and 27 of those receiving standard treatment (52 percent), serious retinopathy requiring photocoagulation developed (P = 0.01). Visual acuity decreased in 6 patients receiving intensified treatment (14 percent) and in 18 receiving standard treatment (35 percent) (P = 0.02). Nephropathy (urinary albumin excretion, >200 µg per minute) developed in one patient in the group receiving intensified treatment, as compared with nine patients in the group receiving standard treatment (P = 0.01). No patient in the intensified-treatment group had nephropathy with subnormal glomerular filtration rates, as compared with six patients in the standard-treatment group (P = 0.02). The conduction velocities of the ulnar, tibial, peroneal, and sural nerves decreased significantly more in the standard-treatment group than in the intensified-treatment group. The odds ratio for serious retinopathy was 0.4 (95 percent confidence interval, 0.2 to 1.0; P = 0.04) in the intensified-treatment group as compared with the standard-treatment group. The corresponding odds ratio for nephropathy was 0.1 (95 percent confidence interval, 0 to 0.8; P = 0.04).

Conclusions Long-term intensified insulin treatment, as compared with standard treatment, retards the development of microvascular complications in patients with insulin-dependent diabetes mellitus.


Source Information

From the Departments of Internal Medicine (P.R.) and Clinical Neurophysiology (B.-Y.N.), Sodersjukhuset, and the Stockholm County Council Teaching Center for Diabetes and Karolinska Sjukhuset (U.R.), all in Stockholm, Sweden.

Address reprint requests to Dr. Reichard at the Department of Internal Medicine, Sodersjukhuset, 118 83 Stockholm, Sweden.

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