Intravenous Immunoglobulin (IVIg) for the Treatment of Stiff-Man Syndrome (SMS)

Spasm Clinical Trial

Official title: The Efficacy of High-Dose Intravenous Immunoglobulin Therapy in Patients With Stiff-Man Syndrome: A Double-Blind, Placebo-Controlled Trial

Status Completed

Clinical Trial Summary

Stiff-man Syndrome (SMS) is a chronic, progressive disorder of the nervous system. It is associated with painful muscle spasms and rigidity involving muscles of the limbs, trunk, and neck. The cause of the disease is unknown, but researchers believe it may be a result of an autoimmune process. Patients with Stiff-man Syndrome may produce antibodies that attack enzymes required for the normal function of the nervous system.

Steroids, plasmapheresis, and intravenous immunoglobulin (IVIg) have been given to relieve some of the symptoms of Stiff-man Syndrome. However, none of these therapies have proven to be significantly effective.

This study will attempt to determine the effectiveness of intravenous immunoglobulin (IVIg) for the treatment of Stiff-mann Syndrome. Patients participating in this study will be divided into two groups. Group one will receive 2 injections of IVIg once a month for three months. Group two will receive 2 injections of placebo "inactive sterile water" once a month for three months. Following the three months of treatment, group one will begin taking the placebo and group two will begin taking IVIg for an additional 3 months. The drug will be considered effective if patients receiving it experience a significant improvement in muscle function, mobility, and stiffness.

Clinical Trial Description

Stiff-man Syndrome (SMS) is a chronic, disabling neurological disorder characterized by severe and painful axial and limb rigidity enhanced by anxiety, sudden motion or external stimuli. Although the cause of SMS is unknown, immunologic mechanisms have been implicated on the basis of circulating autoantibodies in the patient's serum and CSF, against GAD (glutamic acid decarboxylase), the enzyme involved in the synthesis of GABA (gamma aminobutyric acid). Uncontrolled studies have also shown that plasmapheresis, corticosteroids and high dose intravenous immunoglobulin (IVIg) are variably effective in improving the clinical symptoms of these patients. The purpose of the present study is to demonstrate in a double blind, placebo-control design, the efficacy of IVIg in patients with SMS. The effect of IVIg will be assessed with a series of objective measurements including muscle function, mobility and stiffness. Changes in the circulating anti-GAD antibodies will be also examined and their pathogenetic role in the cause of SMS will be determined. If IVIg proves effective, it will be a valuable tool in the treatment of these patients who are currently dependent on high doses of Valium (up to 60-100 mg daily), or steroids and experience significant side effects. ;

Study Design

Endpoint Classification: Safety Study, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Multiple Endocrine Neoplasia
• Muscle Rigidity
• Spasm
• Stiff Man Syndrome
• Stiff-Person Syndrome
• Syndrome

• NCT number: NCT00001550
• Study type: Interventional
• Source: National Institutes of Health Clinical Center (CC)
• Status: Completed
• Phase: Phase 1
• Start date: April 1996
• Completion date: May 2002