Abstract
Funding Acknowledgements
Type of funding sources: Foundation. Main funding source(s): This work was supported by the Norwegian Research Council [203489/030]
onbehalf
Department of Cardiology, Research group for genetic cardiac diseases and sudden cardiac death, Oslo University Hospital, Rikshospitalet, Oslo, Norwa
Background
Lamin A/C disease is an inheritable cardiomyopathy characterized by conduction abnormalities, ventricular arrhythmias and end stage heart failure with complete age-related penetrance.
Purpose
To assess left ventricular structural and functional progression in patients with lamin A/C cardiomyopathy.
Methods
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.
Results
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.
Conclusions
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.
Left ventricular systolic function decreases in lamin a/c cardiomyopathy wihout concomitant ventricular dilatation
