Myocardial Fibrosis as a Predictor of Sudden Death in Patients With Coronary Artery Disease.

Zegard, Abbasin, Okafor, Osita, De Bono, Joseph, Kalla, Manish, Lencioni, Mauro, Marshall, Howard, Hudsmith, Lucy E, Qiu, Tian, Steeds, Richard Paul, Stegemann, Berthold and Leyva, Francisco (2021) Myocardial Fibrosis as a Predictor of Sudden Death in Patients With Coronary Artery Disease. Journal of the American College of Cardiology, 77 (1). pp. 29-41. ISSN 1558-3597.

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Abstract

BACKGROUND

The "gray zone" of myocardial fibrosis (GZF) on cardiovascular magnetic resonance may be a substrate for ventricular arrhythmias (VAs).

OBJECTIVES

The purpose of this study was to determine whether GZF predicts sudden cardiac death (SCD) and VAs (ventricular fibrillation or sustained ventricular tachycardia) in patients with coronary artery disease (CAD) and a wide range of left ventricular ejection fractions (LVEFs).

METHODS

In this retrospective study of CAD patients, the presence of myocardial fibrosis on visual assessment (MF) and GZF mass in patients with MF were assessed in relation to SCD and the composite, arrhythmic endpoint of SCD or VAs.

RESULTS

Among 979 patients (mean age [± SD]: 65.8 ± 12.3 years), 29 (2.96%) experienced SCD and 80 (8.17%) met the arrhythmic endpoint over median 5.82 years (interquartile range: 4.1 to 7.3 years). In the whole cohort, MF was strongly associated with SCD (hazard ratio: 10.1; 95% confidence interval [CI]: 1.42 to 1,278.9) and the arrhythmic endpoint (hazard ratio: 28.0; 95% CI: 4.07 to 3,525.4). In competing risks analyses, associations between LVEF <35% and SCD (subdistribution hazard ratio [sHR]: 2.99; 95% CI: 1.42 to 6.31) and the arrhythmic endpoint (sHR: 4.71; 95% CI: 2.97 to 7.47) were weaker. In competing risk analyses of the MF subcohort (n = 832), GZF using the 3SD method (GZF) >5.0 g was strongly associated with SCD (sHR: 10.8; 95% CI: 3.74 to 30.9) and the arrhythmic endpoint (sHR: 7.40; 95% CI: 4.29 to 12.8). Associations between LVEF <35% and SCD (sHR: 2.62; 95% CI: 1.24 to 5.52) and the arrhythmic endpoint (sHR: 4.14; 95% CI: 2.61 to 6.57) were weaker.

CONCLUSIONS

In CAD patients, MF plus quantified GZF mass was more strongly associated with SCD and VAs than LVEF. In selecting patients for implantable cardioverter-defibrillators, assessment of MF followed by quantification of GZF mass may be preferable to LVEF.

Item Type:	Article
Subjects:	WG Cardiovascular system. Cardiology
Divisions:	Emergency Services > Cardiology
Related URLs:	https://pubmed.ncbi.nlm.nih.gov/33413938...
Depositing User:	Jamie Edgar
Date Deposited:	20 Jan 2021 15:28
Last Modified:	20 Jan 2021 15:28
URI:	http://www.repository.uhblibrary.co.uk/id/eprint/3879

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