Familial occurrence of complex regional pain syndrome.

Background: The etiology of complex regional pain syndrome (CRPS) is unknown. Different environmental and genetic factors have been postulated to contribute to CRPS.

Methods: We reviewed the clinical data from a cohort of 69 patients with CRPS.

Ketamine treatment for intractable pain in a patient with severe refractory complex regional pain syndrome: a case report.

In this case report, we describe the effect of ketamine infusion in a case of severe refractory complex regional pain syndrome I (CRPS I). The patient was initially diagnosed with CRPS I in her right upper extremity. Over the next 6 years, CRPS was consecutively diagnosed in her thoracic region, left upper extremity, and both lower extremities.