Prognostic value of coronary artery calcium score in patients with stable angina pectoris after percutaneous coronary intervention

Objectives To evaluate the prognostic value of the coronary artery calcium(CAC) score in patients with stable angina pectoris(SAP)who underwent percutaneous coronary intervention(PCI).Methods A total of 334 consecutive patients with SAP who underwent first PCI following multi-slice computer tomography(MSCT) were enrolled from our institution between January 2007 and June 2012.The CAC score was calculated according to the standard Agatston calcium scoring algorithm.Complex PCI was defined as use of high pressure balloon,kissing balloon and/or rotablator.Procedure-related complications included dissection,occlusion,perforation,no/slow flow and emergency coronary artery bypass grafting.Main adverse cardiac events(MACE) were defined as a combined end point of death,non-fatal myocardial infarction,target lesion revascularization and rehospitalization for cardiac ischemic events.Results Patients with a CAC score >300(n = 145) had significantly higher PCI complexity(13.1%vs.5.8%,P = 0.017) and rate of procedure-related complications(17.2%vs.7.4%,P = 0.005) than patients with a CAC score < 300(n = 189).After a median follow-up of 22.5 months(4-72 months),patients with a CAC score < 300 differ greatly than those patients with CAC score > 300 in cumulative non-events survival rates(88.9 vs.79.0%,Log rank4.577,P = 0.032).After adjusted for other factors,the risk of MACE was significantly higher[hazard ratio(HR):4.3,95%confidence interval(95%CI):2.4-8.2,P=0.038]in patients with a CAC score > 300 compared to patients with a lower CAC score.Conclusions The CAC score is an independent predictor for MACE in SAP patients who underwent PCI and indicates complexity of PCI and procedure-related complications.