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Condition

Multifocal Motor Neuropathy

Symptoms, Doctors, Treatments, Research & More

Condition 101

What is the definition of Multifocal Motor Neuropathy?

Multifocal motor neuropathy (MMN) is a rare neuropathy characterized by progressive, asymmetric muscle weakness and atrophy (wasting). Signs and symptoms may include weakness in the hands and lower arms; cramping; involuntary contractions or twitching; wrist drop or foot drop, and atrophy of affected muscles. MMN is thought to be due to an abnormal immune response, but the underlying cause is not clear. Most people treated with intravenous immune globulin (IVIG) have rapid improvement in weakness, but maintenance IVIG is usually required for sustained improvement. Cyclophosphamide has also been effective in treating MMN. Physical and occupational therapy may be helpful for some people with MMN.

What are the alternative names for Multifocal Motor Neuropathy?

  • MMN
  • MMNCB
  • Multifocal motor neuropathy with conduction block

What are the causes for Multifocal Motor Neuropathy?

The exact underlying cause of multifocal motor neuropathy (MMN) is poorly understood. It is considered an immune-mediated disorder (due to an abnormal immune system response), both because IVIG therapy improves symptoms, and many patients have anti-GM1 antibodies. Research to further understand the cause of MMN is underway.

What are the symptoms for Multifocal Motor Neuropathy?

Signs and symptoms of multifocal motor neuropathy (MMN) may include weakness; cramping; involuntary contractions or twitching; wrist drop or foot drop; and wasting (atrophy) of affected muscles. Atrophy occurs late in the course of the condition. Muscles of the hands and lower arms are most commonly affected, but muscles of the lower limbs may also be involved. The symptoms are often asymmetrical, meaning that they differ on the right and left side of the body.

What are the current treatments for Multifocal Motor Neuropathy?

Multifocal motor neuropathy (MMN) is considered treatable with intravenous immune globulin (IVIG). Early treatment shortly after symptoms begin is recommended. Most people have a fairly rapid improvement in weakness with IVIG, but the improvement generally does not last beyond a few months. Maintenance IVIG infusions are usually needed every two to six weeks. For those with severe disease whose symptoms don't respond to IVIG (or for those who become resistant), treatment options are limited. Several reports have suggested that cyclophosphamide may be partially effective.

Is Multifocal Motor Neuropathy an inherited disorder?

We are not aware of any evidence that multifocal motor neuropathy (MMN) is inherited or of any reports of familial cases (occurring in more than one person in a family). Furthermore, to our knowledge, no specific genes known to be associated with MMN have been identified.

Top Global Doctors

HB
Elite
Hugh Bostock
London, ENG, GB
JL
Elite
Jean-marc Leger
Paris, 11, FR
ED
Elite
Emilien Delmont
Marseille, 93, FR

Latest Research

Latest Advance
Study
  • Condition: Multifocal Motor Neuropathy
  • Journal: Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia
  • Treatment Used: IVIg
  • Number of Patients: 11
  • Published —
This study tested the safety and efficacy of using IVIg to treat patients with multifocal motor neuropathy.
Latest Advance
Study
  • Condition: Multifocal Motor Neuropathy
  • Journal: Journal of neurology
  • Treatment Used: Human Immunoglobulin 10% with Recombinant Human Hyaluronidase
  • Number of Patients: 18
  • Published —
This study tested the safety and efficacy of using human immunoglobulin 10% alongside recombinant human hyaluronidase to treat patients with multifocal motor neuropathy.

Clinical Trials

There are no recent clinical trials available for this condition. Please check back because new trials are being conducted frequently.