Treatment with carbamazepine and gabapentin of a patient with primary erythermalgia (erythromelalgia) identified to have a mutation in the SCN9A gene, encoding a voltage-gated sodium channel.

Primary erythermalgia (erythromelalgia) is a rare autosomal dominant condition characterized by intermittent attacks of erythema, increased skin temperature and severe burning pain in the extremities, in a bilateral symmetrical distribution. Mutations in the SCN9A gene, which encodes a voltage-gated sodium channel have been shown to cause this disease. We report a family identified to have a mutation in the SCN9A gene, in which one severely affected family member has responded to the therapeutic combination of gabapentin and carbamazepine treatment.