Left ventricular systolic function decreases in lamin a/c cardiomyopathy wihout concomitant ventricular dilatation

Type of funding sources: Foundation. Main funding source(s): This work was supported by the Norwegian Research Council [203489/030] Department of Cardiology, Research group for genetic cardiac diseases and sudden cardiac death, Oslo University Hospital, Rikshospitalet, Oslo, Norwa Lamin A/C disease is an inheritable cardiomyopathy characterized by conduction abnormalities, ventricular arrhythmias and end stage heart failure with complete age-related penetrance. To assess left ventricular structural and functional progression in patients with lamin A/C cardiomyopathy. We included and followed consecutive lamin A/C genotype positive patients with clinical examination and echocardiography at every visit. We evaluated progression of left- ventricular size and function by mixed model statistics. We included 101 consecutive lamin A/C genotype positive patients (age 44 [29-54] years, 39% probands, 51%female) with 576 echocardiographic exams during 4.9 (IQR 2.5-8.1) years of follow-up. LV ejection fraction (LVEF) declined from 50 ± 12% to 47 ± 13%, p < 0.001 (rate -0.5%/year). LV end diastolic volumes (LVEDV) remained stationary with no significant dilatation in the total population (136 ± 45ml to 138 ± 43ml, p = 0.60), (Figure). In the subgroup of patients >58 years, we observed a decline in LV volumes 148, SE 9 ml to 140, SE 9 ml p < 0.001 (rate -2.7 ml/year) towards end stage heart failure. LVEF deteriorated, while LV size remained unchanged during 4.9 years of follow-up in patients with lamin A/C cardiomyopathy. In patients <58 years, we observed a reduction in LV volumes. These findings represent loss of LV function without the necessary compensatory dilation to preserve stroke volume indicating high risk of decompensated end stage heart failure in lamin A/C. Abstract Figure.