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Myocardial scar burden predicts survival benefit with implantable cardioverter defibrillator implantation in patients with severe ischaemic cardiomyopathy: influence of gender
  1. Deborah H Kwon1,2,
  2. Rory Hachamovitch1,
  3. Aderonke Adeniyi1,
  4. Benjamin Nutter1,
  5. Zoran B Popovic1,2,
  6. Bruce L Wilkoff1,
  7. Milind Y Desai1,2,
  8. Scott D Flamm2,
  9. Thomas Marwick3
  1. 1Heart and Vascular Institute, Cleveland Clinic, Cleveland, Ohio, USA
  2. 2Imaging Institute, Cleveland Clinic, Cleveland, Ohio, USA
  3. 3Menzies Research Institute of Tasmania, Hobart, Australia
  1. Correspondence to Dr Deborah H Kwon, Department of Cardiovascular Medicine, Cleveland Clinic, 9500 Euclid Avenue, J1-5, Cleveland, OH 44195, USA; kwond{at}ccf.org

Abstract

Objective We sought to assess the impact of myocardial scar burden (MSB) on the association between implantable cardioverter defibrillator (ICD) implantation and mortality in patients with ischaemic cardiomyopathy (ICM) and left ventricular EF ≤40%. In addition, we sought to determine the impact of gender on survival benefit with ICD implantation.

Design Retrospective observational study.

Setting Single US tertiary care centre.

Patients Consecutive patients with significant ICM who underwent delayed hyperenhancement-MRI between 2002 and 2006.

Interventions ICD implantation.

Main outcome measures All-cause mortality and cardiac transplantation.

Results Follow-up of 450 consecutive patients, over a mean of 5.8 years, identified 186 deaths. Cox proportional hazard modelling was used to evaluate associations among MSB, gender and ICD with respect to all-cause death as the primary endpoint. ICDs were implanted in 163 (36%) patients. On multivariable analysis, Scar% (χ2 28.21, p<0.001), Gender (χ2 12.39, p=0.015) and ICD (χ2 9.57, p=0.022) were independent predictors of mortality after adjusting for multiple parameters. An interaction between MSB×ICD (χ2 9.47, p=0.009) demonstrated significant differential survival with ICD based on MSB severity. Additionally, Scar%×ICD×Gender (χ2 6.18, p=0.048) suggested that men with larger MSB had significant survival benefit with ICD, but men with smaller MSB derived limited benefit with ICD implantation. However, the inverse relationship was found in women.

Conclusions MSB is a powerful independent predictor of mortality in patients with and without ICD implantation. In addition, MSB may predict gender-based significant differences in survival benefit from ICDs in patients with severe ICM.

  • CORONARY ARTERY DISEASE

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