Warm-Up of Myotonia in Myotonia Congenita
Video demonstrates the characteristic reduction in myotonia, or warm-up, with repetitive hand grips seen in patients with myotonia congenita. The patient is instructed to squeeze his hand closed as tightly as he can and then open his hand quickly. This maneuver is repeated to evaluate for warm-up of myotonia or paradoxical worsening.
Richard J. Barohn, MD, FAAN
CONTINUUM: Lifelong Learning in Neurology. 19(6, Muscle Disease):1598-1614, December 2013