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Arch Neurol. 2010 Aug;67(8):976-9. doi: 10.1001/archneurol.2010.174.

Autonomic symptoms in carriers of the m.3243A>G mitochondrial DNA mutation.

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  • 1Department of Neurology, Columbia University, 710 W 168th St, New York, NY 10032, USA.

Abstract

BACKGROUND:

The m.3243A>G mutation can cause multisystem medical problems and can affect the autonomic nervous system.

OBJECTIVE:

To study the frequency and spectrum of autonomic symptoms associated with the m.3243A>G mitochondrial DNA point mutation. Design, Setting, and Patients We studied a cohort of 88 matrilineal relatives from 40 families, including 35 fully symptomatic patients with mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes (MELAS), 53 carrier relatives, and 16 controls using a questionnaire based on existing standard instruments for the evaluation of autonomic dysfunction. We compared the questionnaire with an expert evaluation. We compared data among the 3 groups using the Mantel-Haenszel chi(2) test to determine the statistical significance of differences between groups.

RESULTS:

Mutation carriers frequently had symptoms of autonomic dysfunction, specifically gastrointestinal and orthostatic intolerance.

CONCLUSIONS:

Carriers of the m.3243A>G mutation have frequent autonomic symptoms. The m.3243A>G mutation should be considered as an etiological factor in patients with autonomic dysfunction and a medical or family history suggestive of mitochondrial disease. Because some autonomic symptoms are treatable, early detection and proactive management may mitigate the burden of morbidity.

PMID:
20697048
[PubMed - indexed for MEDLINE]
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