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NINDS CDE Notice of Copyright
Bedside Myotonia
Availability
In public domain.
Classification
Supplemental- Highly Recommended: Myotonic Dystrophy (DM) - Recommended for QOL, functional status, therapy
Short Description of Instrument
Myotonia will be sought on physical examination using the following techniques: 1. Eye closure myotonia. The participant will be instructed to close the eyes tightly for 3 seconds, and then to open the eyes. This test will be performed 5 times. Eye closure myotonia is present if there is difficulty fully opening the eyelids. 2. Hand-grip myotonia. The participant will be instructed to forcefully close the fingers in a fist for 3 seconds, and then rapidly open the fist. This test will be performed 5 times. Hand-grip myotonia is present if the fingers cannot be immediately extended.
Scoring
Eye closure myotonia and hand-grip myotonia are scored by seconds before the subject can either fully open their eyes or their hand. 5 trials are performed.
Comments/Special Instructions
Administration Time: 5 minutes
References
Trip, J., G. Drost, et al. (2009). Redefining the clinical phenotypes of non- dystrophic myotonic syndromes. J Neurol Neurosurg Psychiatry: 80(6):647–652.
Trip, J., G. Drost, et al. (2006). Drug treatment for myotonia. Cochrane Database Syst Rev(1): CD004762.
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