Diabetes and the associated incidence of subclinical atherosclerosis and coronary artery disease: Implications for management

Background We sought to examine the prevalence, sensitivity, and specificit y of coronary calcium (CC), a marker of atherosclerosis, in a population of symptomatic and asymptomatic diabetic persons. Methods We used electron beam tomography (EBT) to quantitate CC in 168 symp tomatic (chest pain or anginal equivalent) persons with diabetes who underw ent coronary angiography and then compared this with a cohort of 155 asympt omatic persons with diabetes. Results In the 168 symptomatic diabetic persons, 124 (74%) had obstructive coronary artery disease (CAD) by angiography . Receiver-operator characteri stic curve analysis was used to maximize sensitivity and specificity for ob structive CAD (>50% stenosis), which established ct CC score of 102 as opti mal. With use of this cut point, EBT has a sensitivity of 77% and a specifi city of 77% for detecting obstructive CAD. Of the 155 asymptomatic diabetic persons, 72% had CC and 48% had a CC score >102. The presumed prevalence o f obstructive disease (on the basis of EBT scores and prevalence of CC) amo ng asymptomatic diabetic persons is quite high (as high as symptomatic pers ons without diabetes). Analyzing the 323 diabetic patients demonstrated no significant age difference in CC scores between women and men. Conclusions This study confirms that higher CC scores should be used in dia betic patients to improve the specificity of CC to determine obstructive di sease. EBT con allow a noninvasive diagnosis of CAD before clinical present ation, allowing for more therapy for those in which CC is detected. These r esults suggest that asymptomatic diabetic persons have the same atherogenic burden of those patients with CAD without diabetes. The high prevalence of CC in asymptomatic persons with diabetes supports the need for aggressive management of diabetes and associated risk factors.