Association of Fibrosis With Mortality and Sudden Cardiac Death in Patients With Nonischemic Dilated Cardiomyopathy

作者：Gulati, Ankur; Jabbour, Andrew; Ismail, Tevfik F.; Guha, Kaushik; Khwaja, Jahanzaib; Raza, Sadaf; Morarji, Kishen; Brown, Tristan D. H.; Ismail, Nizar A.; Dweck, Marc R.; Di Pietro, Elisa; Roughton, Michael; Wage, Ricardo; Daryani, Yousef; O'Hanlon, Rory; Sheppard, Mary N.; Alpendurada, Francisco; Lyon, Alexander R.; Cook, Stuart A.; Cowie, Martin R.; Assomull, Ravi G.; Pennell, Dudley J.; Prasad, Sanjay K.^*

来源：JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 2013, 309(9): 896-908.

DOI：10.1001/jama.2013.1363

• CARDIOVASCULAR MAGNETIC-RESONANCE
• IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS
• HEART-FAILURE
• RISK STRATIFICATION
• MYOCARDIAL FIBROSIS
• TASK-FORCE
• PRACTICE GUIDELINES
• RHYTHM SOCIETY
• PREVENTION
• THERAPY

Importance Risk stratification of patients with nonischemic dilated cardiomyopathy is primarily based on left ventricular ejection fraction (LVEF). Superior prognostic factors may improve patient selection for implantable cardioverter-defibrillators (ICDs) and other management decisions. @@@ Objective To determine whether myocardial fibrosis (detected by late gadolinium enhancement cardiovascular magnetic resonance [LGE-CMR] imaging) is an independent and incremental predictor of mortality and sudden cardiac death (SCD) in dilated cardiomyopathy. @@@ Design, Setting, and Patients Prospective, longitudinal study of 472 patients with dilated cardiomyopathy referred to a UK center for CMR imaging between November 2000 and December 2008 after presence and extent of midwall replacement fibrosis were determined. Patients were followed up through December 2011. @@@ Main Outcome Measures Primary end point was all-cause mortality. Secondary end points included cardiovascular mortality or cardiac transplantation; an arrhythmic composite of SCD or aborted SCD (appropriate ICD shock, nonfatal ventricular fibrillation, or sustained ventricular tachycardia); and a composite of HF death, HF hospitalization, or cardiac transplantation. @@@ Results Among the 142 patients with midwall fibrosis, there were 38 deaths (26.8%) vs 35 deaths (10.6%) among the 330 patients without fibrosis (hazard ratio [HR], 2.96 [95% CI, 1.87-4.69]; absolute risk difference, 16.2% [95% CI, 8.2%-24.2%]; P<.001) during a median follow-up of 5.3 years (2557 patient-years of follow-up). The arrhythmic composite was reached by 42 patients with fibrosis (29.6%) and 23 patients without fibrosis (7.0%) (HR, 5.24 [95% CI, 3.15-8.72]; absolute risk difference, 22.6% [95% CI, 14.6%-30.6%]; P<.001). After adjustment for LVEF and other conventional prognostic factors, both the presence of fibrosis (HR, 2.43 [95% CI, 1.503.92]; P<.001) and the extent (HR, 1.11 [95% CI, 1.06-1.16]; P<.001) were independently and incrementally associated with all-cause mortality. Fibrosis was also independently associated with cardiovascular mortality or cardiac transplantation (by fibrosis presence: HR, 3.22 [95% CI, 1.95-5.31], P<.001; and by fibrosis extent: HR, 1.15 [95% CI, 1.10-1.20], P<.001), SCD or aborted SCD (by fibrosis presence: HR, 4.61 [95% CI, 2.75-7.74], P<.001; and by fibrosis extent: HR, 1.10 [95% CI, 1.051.16], P<.001), and the HF composite (by fibrosis presence: HR, 1.62 [95% CI, 1.002.61], P=.049; and by fibrosis extent: HR, 1.08 [95% CI, 1.04-1.13], P<.001). Addition of fibrosis to LVEF significantly improved risk reclassification for all-cause mortality and the SCD composite (net reclassification improvement: 0.26 [95% CI, 0.11-0.41]; P=. 001 and 0.29 [95% CI, 0.11-0.48]; P=. 002, respectively). @@@ Conclusions and Relevance Assessment of midwall fibrosis with LGE-CMR imaging provided independent prognostic information beyond LVEF in patients with nonischemic dilated cardiomyopathy. The role of LGE-CMR in the risk stratification of dilated cardiomyopathy requires further investigation. JAMA.2013;309(9):896-908 www.jama.com

• 出版日期2013-3-6