Osteoporosis in patients with coronary artery disease after coronary bypas surgery

Abstract

Aim. To determine the most significant predictors of an unfavorable progress of osteoporosis (OP) in men with coronary artery disease after coronary artery bypass grafting (CABG) according to long-term (5 years) follow-up data.Methods. The prospective study included 393 patients (men) hospitalized for CABG. All patients underwent multispiral computed tomography of the coronary and carotid arteries to assess the calcium score (CS) and determine the equivalent density of calcium deposits (EDCD), coronary angiography, and dual-energy X-ray absorptiometry. After 5 years (average 59 months) of follow-up, the prognosis (status alive/dead) was assessed in 335 patients. Mortality during follow-up in patients after CABG was 10.7% (36 patients died). 257 patients underwent repeated osteodensitometry, quantitative assessment of coronary and carotid calcification, assessment of the “end points” of bone status (osteoporotic fractures, osteoporosis).Results. During the five-year follow-up an increase in the prevalence of OP was noted from 76.1% to 90.7%, while in 43.6% of cases, the progression of OP was recorded. Fractures occurred in 39 patients (15.2%), and in 34 (13.2%) osteoporosis developed for the first time. OP progression is associated with smoking (OR 5.3, 95% CI 3.1–9.4), 30% or more carotid artery stenosis (OR 5.6, 95% CI 2.9–10.7), baseline severe (more than 400) calcification of the coronary arteries (OR 2.7 at 95% CI 1.3–9.8), low density of (EDCD less than 0.19 g/mm3 ) coronary (OR 1.7 at 95% CI 1.1–8.2) and carotid (OR 2.4, 95% CI 1.4–10.3) calcium deposits. Linear regression analysis made it possible to establish that the reliable predictors of an unfavorable course of OP are coronary CS, EDCD of the carotid arteries, and the absence of statin therapy.Conclusion. OP progression in patients in the long-term period (5 years) after CABG was noted in 43.6%. The predictors of OP progression and the complications are a high level of coronary artery calcification, a low EDCD in the carotid arteries, and 30% or more stenosis of the carotid arteries. Patients receiving statins were associated with a lower risk of osteoporosis.