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Cardiac sympathetic hypo-innervation in familial dysautonomia

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Abstract

Objective

Familial dysautonomia (FD) involves incomplete development of the sympathetic nervous system. Whether such loss extends to sympathetic innervation of the heart has been unknown. This study used 6-[18F]fluorodopamine neuroimaging to assess cardiac sympathetic innervation and function in FD.

Methods

Six adult FD patients underwent thoracic PET scanning for 30 minutes after i.v. 6-[18F]fluorodopamine injection, as did healthy volunteers without (N = 21) or with (N = 10) pre-treatment by desipramine, which interferes with neuronal uptake and thereby simulates effects of noradrenergic denervation. Effective rate constants for uptake and loss were calculated using a single compartment pharmacokinetic model.

Results

FD patients had decreased uptake and accelerated loss of 6-[18F]fluorodopamine-derived radioactivity in the interventricular myocardial septum (P = 0.009, P = 0.05) and ventricular free wall (P = 0.007, P < 0.001), compared to untreated controls. Desipramine-treated subjects had decreased uptake but normal loss of 6-[18F]fluorodopamine-derived radioactivity.

Conclusions

FD involves cardiac noradrenergic hypo-innervation. Since accelerated loss of 6-[18F]fluorodopamine-derived radioactivity cannot be explained by decreased neuronal uptake alone, FD may also involve augmented NE loss from extant terminals.

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Acknowledgments

This research was supported by the Intramural Research Program of the NIH, National Institute of Neurological Disorders and Stroke.

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Correspondence to David S. Goldstein MD, PhD.

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Goldstein, D.S., Eldadah, B., Sharabi, Y. et al. Cardiac sympathetic hypo-innervation in familial dysautonomia. Clin Auton Res 18, 115–119 (2008). https://doi.org/10.1007/s10286-008-0464-1

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  • DOI: https://doi.org/10.1007/s10286-008-0464-1

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