Neuromyotonia (Isaacs Syndrome)

Neuromyotonia (Isaacs syndrome) is a rare peripheral-nerve hyperexcitability disorder causing continuous muscle fiber activity, clinical muscle cramps, stiffness, myokymia (undulating muscle), delayed relaxation, and hyperhidrosis. It is often autoimmune (voltage-gated potassium-channel antibodies). EMG shows myokymic discharges. Treatment: anticonvulsants (phenytoin/carbamazepine/gabapentin) reduce symptoms; immunotherapy (IVIG/plasma exchange) in autoimmune cases.

Common Symptoms

Muscle cramps/stiffness; myokymia; delayed relaxation; hyperhidrosis; myokymic discharges on EMG

Causes and Pathogenesis

Autoimmune/genetic peripheral-nerve hyperexcitability causes continuous motor-unit firing and myokymia.

Treatment

Anticonvulsants (carbamazepine/gabapentin); IVIG/plasma exchange in autoimmune cases

Preventive Measures

Medication adherence; immunotherapy follow-up.

Department to Visit

It is recommended to visit the Neurology department; an appointment can be booked on this platform before the visit.

Warm reminder: The above information is for health science reference only and cannot replace professional medical diagnosis. If you have related symptoms, please seek medical attention at a regular hospital promptly.