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Practical rules for electrodiagnosis in suspected multifocal motor neuropathy
Mark B Bromberg1, Hessel Franssen
1*Department of Neurology, University of Utah, Salt Lake City, UT; and †Department of Neurology, Neuromuscular Disease Group, Brain Center Rudolf Magnus, University Medical Center, Utrecht, the Netherlands.
Journal of Clinical Neuromuscular Disease
|February 20, 2015
Summary
Diagnosing multifocal motor neuropathy (MMN) requires identifying conduction block (CB) on electrodiagnostic tests. A practical algorithm aids in accurate diagnosis and treatment of this rare, treatable nerve condition.
Area of Science:
- Neurology
- Clinical Electrophysiology
Background:
- Multifocal motor neuropathy (MMN) is a rare, chronic immune-mediated neuropathy.
- Conduction block (CB) is a key electrodiagnostic feature of MMN.
- Accurate diagnosis is crucial as MMN is treatable.
Purpose of the Study:
- To outline electrodiagnostic criteria for identifying conduction block in MMN.
- To address challenges in differentiating CB from temporal dispersion.
- To provide a practical approach for diagnosing MMN.
Main Methods:
- Review of consensus electrodiagnostic criteria for CB.
- Consideration of technical factors influencing electrodiagnostic results (e.g., limb temperature, stimulus parameters).
- Application of a 4-step diagnostic algorithm.
Main Results:
- Established criteria support definite or probable CB diagnosis.
- Awareness of technical issues minimizes diagnostic errors.
- A structured algorithm facilitates correct diagnosis.
Conclusions:
- Accurate electrodiagnostic assessment is key for MMN diagnosis.
- A systematic approach, including a 4-step algorithm, improves diagnostic accuracy.
- Timely diagnosis and treatment, often with intravenous immunoglobulin, improve patient outcomes.
