What is Morvan Syndrome?

Morvan Syndrome, also known as Morvan fibrillary chorea, is an exceptionally rare and complex autoimmune neurological disorder. It is characterized by a combination of peripheral nerve hyperexcitability, autonomic instability, and central nervous system dysfunction. The condition is often associated with antibodies against the voltage-gated potassium channel (VGKC) complex, specifically targeting the proteins LGI1 and CASPR2.

Because it affects multiple levels of the nervous system from the brain down to the peripheral nerves, patients experience a bewildering array of symptoms that can make the initial diagnosis difficult. It is frequently considered a paraneoplastic syndrome, meaning it can be triggered by an underlying tumor, most commonly a thymoma (a tumor of the thymus gland). However, it can also occur as a primary autoimmune event without the presence of cancer. The hallmark of the disease is the presence of neuromyotonia (muscle twitching) combined with severe insomnia and confusion.

What are the symptoms of Morvan Syndrome?

The symptoms of Morvan syndrome are categorized by the area of the nervous system they affect. Unlike many other disorders that stay localized, Morvan syndrome presents a triad of peripheral, autonomic, and central symptoms.

Peripheral Nerve Hyperexcitability

• Neuromyotonia: This is the most noticeable symptom. It causes constant muscle activity, which can look like rippling under the skin (myokymia) or involuntary twitching (fasciculations).
• Muscle Cramps and Stiffness: People with Morvan syndrome often have painful cramps that happen on their own, especially in the calves and thighs.
• Hyperreflexia: This means the reflexes are more active than normal when checked by a doctor.

Central Nervous System Dysfunction

• Agrypnia Excitata: This is a severe form of total insomnia where the patient is unable to sleep for days or even weeks. It is often accompanied by "oneiric stupor," where the patient appears to be acting out dreams while awake.
• Confusion and Delirium: Rapid changes in mental status, disorientation, and hallucinations.
• Memory Loss: Significant difficulty with short-term recall and cognitive processing.

Autonomic Instability

• Hyperhidrosis: This means sweating a lot, which can sometimes cause dehydration.
• Cardiovascular Fluctuations: The heart rate and blood pressure can change suddenly and unpredictably.
• Weight Loss: People often lose weight quickly and without explanation because their muscles are always active.

What causes Morvan Syndrome?

The primary cause of Morvan syndrome is a malfunction of the immune system. Specifically, the body produces autoantibodies that mistakenly attack the voltage-gated potassium channel (VGKC) complex on the surface of nerve cells. These channels are responsible for regulating the electrical signals in the nerves. When they are blocked or damaged by antibodies, the nerves become "leaky" and fire uncontrollably.

There are two main triggers for this autoimmune response:

1. Paraneoplastic Trigger: In about 40% to 50% of cases, the immune system produces these antibodies in response to a tumor, typically a thymoma. The immune system tries to fight the tumor but ends up attacking the nervous system instead.
2. Idiopathic Autoimmune Trigger: In other cases, no tumor is found. The immune system may be triggered by a viral infection or environmental factor that leads to the production of CASPR2 or LGI1 antibodies.

What are the complications of Morvan Syndrome?

If left untreated, Morvan syndrome can be life-threatening due to the severe strain it places on the body. The most common complications include:

• Cardiac Arrest: Autonomic instability can cause the heart to stop or develop dangerous rhythms.
• Severe Dehydration and Electrolyte Imbalance: Caused by extreme sweating and constant muscle overactivity.
• Respiratory Failure: If the muscles involved in breathing become affected by neuromyotonia or weakness.
• Psychological Trauma: The prolonged lack of sleep and vivid hallucinations can lead to long-term psychological distress.
• Complications of Malignancy: If a tumor is the underlying cause, the cancer itself may spread if not detected early.

How do doctors diagnose Morvan Syndrome?

Diagnosis requires a high index of suspicion from a neurologist. Because the symptoms are so diverse, doctors must rule out heavy metal poisoning (like mercury), rabies, and limb encephalitis.

• Antibody Testing: A specialized blood test or spinal fluid analysis is performed to look for CASPR2 and LGI1 antibodies. CASPR2 is the most common marker for Morvan syndrome.
• Electromyography (EMG): This test records the electrical activity of muscles. In Morvan syndrome, it will show "doublets," "triplets," or "multiplets" of high-frequency discharges, confirming neuromyotonia.
• Polysomnography (Sleep Study): This confirms the absence of normal sleep architecture and the presence of agrypnia excitata.
• Tumor Screening: Once Morvan is suspected, doctors must perform CT scans of the chest or PET scans to look for a thymoma or other hidden tumors.
• Brain MRI: While often normal, an MRI may show inflammation in the limbic system of the brain.

How is Morvan Syndrome treated?

The treatment of Morvan syndrome is a multi-step process that focuses on removing the antibodies and addressing the underlying cause.

1. Tumor Removal: If a thymoma is found, surgical removal is the first priority. This often leads to a significant improvement in neurological symptoms.
2. Plasma Exchange (Plasmapheresis): This involves filtering the blood to physically remove the harmful antibodies. It is often the fastest way to stabilize a patient.
3. Intravenous Immunoglobulin (IVIg): Infusions of healthy antibodies from donors to neutralize the patient's harmful autoantibodies.
4. Immunosuppression: Long-term use of corticosteroids (like prednisone) or other medications like Rituximab or Azathioprine to prevent the immune system from creating more antibodies.
5. Symptomatic Control: Medications like Carbamazepine or Phenytoin are used to stabilize the nerve membranes and stop the muscle twitching. Sedatives may be used to attempt to induce sleep, though standard sleeping pills are often ineffective.

What can I expect if I have Morvan Syndrome?

The prognosis for Morvan syndrome varies depending on whether a tumor is present and how quickly treatment begins. For many patients, the disease follows a relapsing-remitting or monophasic course.

With strong immunotherapy, many people recover fully or almost fully, but it can take months for the brain and nerves to heal and for normal sleep to return. If cancer is involved, the long-term outlook depends on how advanced and treatable the cancer is. Regular check-ups with a neurologist are important for several years to watch for any return of symptoms.

Can Morvan Syndrome be prevented?

At this time, there is no known way to prevent Morvan syndrome. Since it is an autoimmune disorder often triggered by things inside the body or rare tumors, there are no lifestyle changes that can guarantee prevention. However, finding thymomas early through regular check-ups can help prevent symptoms caused by tumors. Being aware of the symptoms, especially muscle twitching and severe insomnia, is the best way to get an early diagnosis and improve the chances of a good outcome.

How do I take care of myself?

Recovery from Morvan syndrome is a long journey. Patients should focus on:

• Nutrition: Replacing lost fluids and electrolytes is critical during the sweating and twitching phase.
• Physical Therapy: Rebuilding muscle strength that may have been lost during the acute phase of the illness.
• Mental Health Support: Counseling is highly recommended to deal with the trauma of severe delirium and insomnia.
• Environmental Safety: Ensuring a calm, low-stimulation environment to help the brain recover and eventually return to a normal circadian rhythm.

When should I see my doctor?

Immediate medical attention is required if you or a loved one experiences:

• Continuous rippling of muscles under the skin that does not stop with rest.
• Complete inability to sleep for more than 48 hours.
• Sudden confusion, hallucinations, or personality changes.
• Excessive sweating accompanied by a racing heart while at rest.

Early intervention is the key to preventing the most severe complications of this rare disorder.

Why choose Tender Palm Super-Speciality Hospital for Morvan Syndrome Treatment in Lucknow, India?

Tender Palm Super-Speciality Hospital offers advanced Morvan Syndrome treatment in Lucknow, India, at an affordable cost. We have a team of experienced neurologists and neuroimmunology specialists who provide accurate diagnosis and both non-pharmacological and pharmacological treatment options including immunotherapy, symptomatic medication management, and comprehensive neurological rehabilitation procedures. Our Neurology and Neuroimmunology team has decades of experience in successfully treating Morvan Syndrome in Lucknow, India.

To seek an Expert Consultation for Morvan Syndrome Treatment in Lucknow, India:

Call us at +91-9076972161
Email at care@tenderpalm.com

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