Late Gadolinium Enhancement Variation in Asymptomatic Individuals: Comparison with Dilated Cardiomyopathy.

Abstract

Late gadolinium enhancements (LGEs) appear in asymptomatic individuals as septal stripes, which mimic abnormal LGEs in patients with dilated cardiomyopathy (DCM). We aimed to evaluate the frequency and extent of LGE variation in asymptomatic individuals and to compare it with those of DCM group. This retrospective study included asymptomatic and DCM groups who underwent CMR imaging. LGE was defined as a myocardial signal intensity higher than five standard-deviations of normal myocardium. LGE was evaluated in right ventricular insertion points (RVIPs) and mid-interventricular septum. A total of 273 asymptomatic individuals (age, 54.3 ± 5.8 years, 209 males) and 100 patients with DCM (age, 55.3 ± 4.9 years, 73 males) were included. LGE was observed in 99.3% of asymptomatic and 100% of DCM groups. The average number of myocardial segments with LGE was distinguishable between asymptomatic and DCM groups (5.5 ± 1.7 vs. 7.6 ± 2.2; p < 0.001). The thickness of LGE differed between two groups in mid-septum (4.5 ± 1.3 mm vs. 5.7 ± 1.8 mm; p < 0.001), upper RVIP (6.1 ± 1.9 mm vs. 8.7 ± 2.7 mm; p < 0.001), and lower RVIP (6.4 ± 2.3 mm vs. 8.6 ± 2.8 mm; p < 0.001). Considerable overlap was observed in LGE between asymptomatic and DCM groups despite different LGE characteristics between them. LGEs within normal range should not be interpreted as abnormal findings in the evaluation of myocardial diseases including DCM.