Symptoms and Signs
Patients typically complain of muscle stiffness that can continue to focal weakness. This muscle stiffness cannot be walked-off, in contrast to myotonia congenita. These symptoms are increased (and sometimes induced) in cold environments. For example, some patients have reported that eating ice cream leads to a stiffening of the throat. For other patients, exercise consistently induces symptoms of myotonia and/or weakness. Typical presentations of this are during squating or repetitive fist clenching. Some patients also indicate that specific foods are able to induce symptoms of paramyotonia congenita. Isolated cases have reported that carrots and watermelon are able to induce these symptoms. The canonical definition of this disorder precludes permanent weakness in the definition of this disorder. In practice, however, this has not been strictly adhered to in the literature.
Read more about this topic: Paramyotonia Congenita
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