Journal
EUROPEAN HEART JOURNAL
Volume 36, Issue 26, Pages 1676-1688Publisher
OXFORD UNIV PRESS
DOI: 10.1093/eurheartj/ehv102
Keywords
ICD; Implantable cardioverter defibrillator; Lifespan; Mortality; Heart failure; Sudden death
Categories
Funding
- British Heart Foundation
- British Heart Foundation [FS/14/27/30752, FS/10/38/28268, FS/14/25/30676, FS/13/44/30291] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0611-10227] Funding Source: researchfish
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Background In at-risk patients with left ventricular dysfunction, implantable cardioverter defibrillators (ICDs) prolong life. Implantable cardioverter defibrillators are increasingly implanted for primary prevention and therefore into lower risk patients. Trial data have demonstrated the benefit of these devices but does not provide an estimate of potential lifespan-gain over longer time periods, e.g. a patient's lifespan. Methods Using data from landmark ICD trials, lifespan-gain was plotted against baseline annual mortality in the individual trials. Lifespan-gain was then extrapolated to a time-horizon of > 20 years while adjusting for increasing 'competing' risk from ageing and non-sudden cardiac death (pump failure). Results At 3 years, directly observed lifespan-gain was strongly dependent on baseline event rate (r = 0.94, P < 0.001). However, projecting beyond the duration of the trial, lifespan-gain increases rapidly and non-linearly with time. At 3 years, it averages 1.7 months, but by 10 years up to 9-fold more. Lifespan-gain over time horizons > 20 years were greatest in lower risk patients (similar to 5 life-years for 5% baseline mortality, similar to 2 life-years for 15% baseline mortality). Increased competing risks significantly reduce lifespan-gain from ICD implantation. Conclusion While high-risk patients may show the greatest short-term gain, the dramatic growth of lifespan-gain over time means that it is the lower risk patients, e.g. primary prevention ICD implantation, who gain the most life-years over their lifetime. Benefit is underestimated when only trial data are assessed as trials can only maintain randomization over limited periods. Lifespan-gain may be further increased through advances in ICD device programming.
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