Coronary Artery Disease
Quantitative Comparison of Angiographic Characteristics of Coronary Artery Disease in Patients With Noninsulin-Dependent Diabetes Mellitus Compared With Matched Nondiabetic Control Subjects

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Abstract

The angiographic characteristics of coronary artery disease (CAD) in noninsulin-dependent diabetes mellitus (NIDDM) patients were studied by quantitative coronary angiography (QCA). Fifty-seven consecutive NIDDM patients undergoing clinically indicated elective coronary angiography and 57 nondiabetic coronary artery disease (CAD) patients were individually matched for sex, age, and body mass index. Technically adequate coronary angiograms, available for 55 subjects in each group, were analyzed with third-generation QCA software. To evaluate the anatomic severity and extent of CAD, several QCA-derived parameters were incorporated into indexes describing various per-patient features of CAD. These measures reflect CAD severity, extent, and overall “atheroma burden,” and were calculated separately for different coronary segments (i.e., left main, proximal, mid, and distal segments), for the different coronary arterial territories (i.e., left main, left anterior descending, left circumflex, and right), and for the entire coronary tree. No significant differences were found between the NIDDM and nondiabetic groups (global severity index, 51 ± 14 vs 54 ± 13, p = NS; global extent index, 34 ± 13 vs 32 ± 12, p = NS; global atheroma burden index, 27 ± 16 vs 24 ± 12, p = NS). We also found no between-group differences in proximal, mid, or distal segments, in separate vessel territories, or in left ventricular function. Our data suggest that CAD patients, with and without NIDDM, who have similar symptoms at a given age, have similar severity and extent of CAD.

Section snippets

Patients and Control Subjects

The study included 57 consecutive NIDDM patients undergoing clinically indicated elective coronary angiography at Helsinki University Central Hospital between September 1989 and February 1992. All patients, aged ≤65 years, had previously diagnosed diabetes fullfilling the World Health Organization criteria[7] for NIDDM and were found to have ≥1 major coronary branch with ≥50% severe diameter stenosis according to visual estimation by the attending cardiologist. Fifty men and 7 women were

Results

Characteristics of study groups are outlined in Table 1. Two of 57 patients or their matched controls were exluded from the study because of poor image quality. Therefore, each of the final study groups included 48 male and 7 female matched subjects. Because of the matching, the groups were well balanced for age and body mass index. Twelve of the NIDDM patients were treated by diet only, 33 were on oral hypoglycemic therapy, and 2 on a combined insulin and oral regimen. Insulin as the only

Discussion

This study focused on the angiographic characteristics of coronary atherosclerosis and left ventricular function in diabetic men and women who underwent coronary angiography in our hospital because of symptomatic CAD. The patients were carefully selected to represent noninsulin-dependent (type 2) diabetes; thus, although some of our patients were treated with insulin, this was due to secondary failure of dietary and oral therapy. In all cases diabetes had been diagnosed after the age of 35 and

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