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Prognostic implications of coronary calcification in patients with obstructive coronary artery disease treated by percutaneous coronary intervention: a patient-level pooled analysis of 7 contemporary stent trials
  1. Christos V Bourantas1,
  2. Yao-Jun Zhang1,
  3. Scot Garg2,
  4. Javaid Iqbal1,
  5. Marco Valgimigli1,
  6. Stephan Windecker3,
  7. Friedrich W Mohr4,
  8. Sigmund Silber5,
  9. Ton de Vries6,
  10. Yoshinobu Onuma1,
  11. Hector M Garcia-Garcia1,
  12. Marie-Angele Morel6,
  13. Patrick W Serruys1,7
  1. 1Thoraxcenter, Erasmus Medical Center, Rotterdam, The Netherlands
  2. 2Department of Cardiology, East Lancashire NHS Trust Blackburn, Lancashire, UK
  3. 3Department of Interventional Cardiology, Bern University Hospital, Bern, Switzerland
  4. 4Herzzentrum, Leipzig, Germany
  5. 5Heart Center at the Isar, Munich, Germany
  6. 6Cardialysis BV, Rotterdam, The Netherlands
  7. 7International Centre for Circulatory Health, NHLI, Imperial College London, London, UK
  1. Correspondence to Patrick W S Serruys, Erasmus MC, Thoraxcenter, Head of Dept of Interventional Cardiology, Thoraxcenter Ba583, Rotterdam 3015 GD, Netherlands; p.w.j.c.serruys{at}erasmusmc.nl

Abstract

Objective To investigate the long-term prognostic implications of coronary calcification in patients undergoing percutaneous coronary intervention for obstructive coronary artery disease.

Methods Patient-level data from 6296 patients enrolled in seven clinical drug-eluting stents trials were analysed to identify in angiographic images the presence of severe coronary calcification by an independent academic research organisation (Cardialysis, Rotterdam, The Netherlands). Clinical outcomes at 3-years follow-up including all-cause mortality, death—myocardial infarction (MI), and the composite end-point of all-cause death—MI—any revascularisation were compared between patients with and without severe calcification.

Results Severe calcification was detected in 20% of the studied population. Patients with severe lesion calcification were less likely to have undergone complete revascularisation (48% vs 55.6%, p<0.001) and had an increased mortality compared with those without severely calcified arteries (10.8% vs 4.4%, p<0.001). The event rate was also high in patients with severely calcified lesions for the combined end-point death—MI (22.9% vs 10.9%; p<0.001) and death—MI— any revascularisation (31.8% vs 22.4%; p<0.001). On multivariate Cox regression analysis, including the Syntax score, the presence of severe coronary calcification was an independent predictor of poor prognosis (HR: 1.33 95% CI 1.00 to 1.77, p=0.047 for death; 1.23, 95% CI 1.02 to 1.49, p=0.031 for death—MI, and 1.18, 95% CI 1.01 to 1.39, p=0.042 for death—MI— any revascularisation), but it was not associated with an increased risk of stent thrombosis.

Conclusions Patients with severely calcified lesions have worse clinical outcomes compared to those without severe coronary calcification. Severe coronary calcification appears as an independent predictor of worse prognosis, and should be considered as a marker of advanced atherosclerosis.

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