Anal sphincter EMG in the diagnosis of parkinsonian syndromes.

Abstract:

BACKGROUND:The role of electromyography (EMG) recorded from the external anal sphincter (EAS) in the diagnosis of atypical parkinsonian syndromes is a matter for continuous debate. Most studies addressing this issue are retrospective. METHODS:In this study, we prospectively investigated six patients with Parkinson's Disease (IPD), 14 patients with multiple system atrophy (MSA) and eight with progressive supranuclear palsy (PSP) using EMG of the EAS, motor-evoked potential (MEP) to the EAS and EMG of m. gastrocnemius and nerve conduction velocity measured at the sural nerve. Patients were followed up for 2 years to secure correct diagnosis. RESULTS:The mean duration of motor unit potentials (MUPs) recorded from the EAS was significantly longer in patients with MSA and PSP compared with MUPs recorded from patients with PD (P < 0.005 for both). There were no signs of diffuse loss of motor neurons or peripheral neuropathy. MEP revealed signs of supranuclear affection in patients with MSA, whereas in patients with PSP the mechanism is a focal loss of motor neurons in Onuf's nucleus. CONCLUSION:Abnormal EMG of the EAS is strongly suggestive of atypical parkinsonism and the pathophysiology may be different in patients with MSA and PSP.

journal_name

Acta Neurol Scand

authors

Winge K,Jennum P,Lokkegaard A,Werdelin L

doi

10.1111/j.1600-0404.2009.01169.x

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

198-203

issue

3

eissn

0001-6314

issn

1600-0404

pii

ANE1169

journal_volume

121

pub_type

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