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Cardiac magnetic resonance characteristics in young survivors of aborted sudden cardiac death.

PURPOSE: We aimed to identify and assess cardiac abnormalities by cardiovascular magnetic resonance (CMR) in a non-ischaemic aborted sudden cardiac death (SCD) population and to establish possible predictors of SCD.

METHODS: Thirty-six consecutive SCD survivors [median age 37.6 years (IQR 24.1-43.2), 31% female] with no previous cardiac history or evidence of ischaemic heart disease underwent CMR on day 6 (IQR 4-10) after admission. Data on ventricular volumes and the extent of late gadolinium enhancement (LGE) were collected. Systolic strain analysis was performed using feature tracking software.

RESULTS: Left ventricular (LV) and right ventricular (RV) indexed diastolic volumes were 92.9 ± 28.4 ml/m2 and 94.1 ± 29 ml/m2 , respectively. LV ejection fraction (EF) and RV EF were 56.8 ± 10.7% and 53.7 ± 10.7%, respectively. Global peak endocardial longitudinal, circumferential, and radial strain were -17.9 ± 4.28%, -23.2 ± 5.8%, and 32.8 ± 10.6%, respectively. Compared to normal range, global longitudinal endocardial strain, longitudinal epicardial strain, circumferential endocardial strain, radial strain, and circumferential endocardial strain rate were impaired. Median volume of LGE was 0.25% (IQR 0.12-1.12) of the LV myocardium with highest prevalence in the inferolateral wall. Patients with cardiomyopathy diagnosis (n = 16) had lower LV strain rate compared to patients without cardiomyopathy (n = 20).

CONCLUSIONS: CMR findings in young patients with aborted SCD due to non-ischaemic heart disease seem to be minor. Although only present in small amounts, LGE appears to have a predilection towards the inferolateral wall in this population.

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