Myoclonus: Causes, Symptoms, Diagnosis and Treatment

Myoclonus is the term for an abrupt, uncontrollably jerking motion. Myoclonus is a disorder that can cause jerky movements or "sleep starts" shortly before bedtime, as well as hiccups. These kinds of myoclonus often affect healthy people and are not life-threatening.

Various pharmaceutical reactions, metabolic diseases, and nervous system problems, such as epilepsy, can cause different forms of myoclonus.

Managing the underlying cause of myoclonus can aid in symptom management. Sometimes there is no known reason for myoclonus and no viable treatment. Reducing the negative effects of myoclonus on quality of life is the goal of therapy in these cases.

Causes Of Myoclonus

Myoclonus can be caused by a variety of underlying problems. It is often divided into multiple categories based on the underlying cause. The cause may help with treatment choices.

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Physiological Myoclonus

When this sort of myoclonus develops in healthy individuals, treatment is rarely necessary. Among them are:

• Pauses while talking
• Feeling sleepy
• Tremors or convulsions triggered by exertion or stress.
• Twitching their muscles in sleep or immediately post-meal.

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Essential Myoclonus

Essential myoclonus occurs on its own; it usually has no symptoms and has nothing to do with underlying medical issues. The cause of essential myoclonus is often mysterious. Now and again, the cause could be inherited or passed down via families.

• Epilepsy and myoclonus
• Myoclonus of this type is indicative of an epileptic condition.

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Symptomatic Myoclonus 

Myoclonus with symptoms is caused by an underlying medical problem. Another name for it is secondary myoclonus. For example, consider the following:

• Harm to the head or spinal cord
• Infection
• Kidney or liver failure
• Lipid-storing illness
• Poisoning by chemicals or drugs
• Prolonged lack of oxygen
• Medication response
• Inflammation-related autoimmune disorders
• Metabolic conditions
• COVID-19 is the coronavirus disease of 2019

Conditions of the nervous system that cause secondary myoclonus include:

• Stroke
• Brain tumor
• Huntington's disease
• Creutzfeldt-Jakob disease
• Alzheimer's condition
• Parkinson's disease and dementia with Lewy bodies
• Loss of corticobasal function.
• Frontotemporal dementia
• Atrophy of several systems

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Symptoms Of Myoclonus

Individuals who have myoclonus frequently characterize their symptoms as jerks, shakes, or spasms that are:

• Sudden
• Brief
• Unintentional 
• Shock-like
• Varying in frequency and severity
• Occurring either throughout the body or just in one area
• Occasionally, it is severe enough to make it difficult to talk, eat, or walk

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Diagnosis Of Myoclonus

To diagnose myoclonus, your doctor looks over your medical history, examines you physically, and assesses your symptoms.

You could have testing to find the source and eliminate other potential myoclonus causes. In some cases, imaging or nerve testing may be necessary.

• An electroencephalogram is referred to as EEG: Through this method, electrical brain activity is recorded. It could help pinpoint the exact area of the brain that causes the myoclonus. Initially, little electrodes are applied to the scalp. You might then be told to take calm, deep breaths while staring at bright lights or listening to noises. Performing these actions could show irregular electrical activity.
• Heart-rate chart (EMG): While doing this, electrodes are placed on a variety of muscles, especially those that are utilized in jerking.
• A machine records your muscles' electrical activity when they are at rest or contracted, like when you bend your arm. Finding the pattern and the cause of the myoclonus is aided by these signs.
• Stimulated potential investigation: The electrical activity of the brain, spinal cord, and brainstem in response to different inputs, such as touch, sound, and vision, is measured during these exams.
• Magnetic resonance imaging (MRI): One possible way to investigate possible sources of myoclonus symptoms is to get an MRI scan to check for tumors or structural problems inside the brain or spinal cord. MRI scans use a magnetic field and radio waves to produce extremely detailed images of the brain, spinal cord, and other body components.
• Lab experiments: Genetic testing may be recommended by your doctor to help identify the source of myoclonus. It can be necessary to perform tests for diabetes, autoimmune illnesses, metabolic disorders, kidney or liver disease, and blood or urine. They can also search for drugs or toxins.

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Treatment Of Myoclonus

Treatment for myoclonus ought to be effective if the underlying cause can be found and addressed. Treatment may target the toxin, drug, or other condition causing the myoclonus.

However, the majority of the time there is no cure or means to address the underlying cause. Reducing myoclonus symptoms is the aim of treatment in these cases, especially if they are debilitating. There aren't any drugs designed specifically to treat myoclonus. Therapy for other conditions, however, may lessen myoclonus symptoms. To control the symptoms, many medications may be required.

Injections of onabotulinumtoxinA (Botox) may be beneficial in treating different types of myoclonus, especially if the condition only affects one location. This therapy prevents a chemical message from being released, which stops muscular spasms.

Surgery

Surgery might be a possibility if the cause of the myoclonus symptoms is a tumor or lesion in the brain or spinal cord. Patients whose myoclonus affects the ear or face may potentially benefit from surgery.

Some individuals have tried deep brain stimulation for movement problems such as myoclonus. Certain brain regions receive implants of electrodes. Electrical signals are produced by the electrodes to stop the erratic impulses that can result in myoclonus. The use of deep brain stimulation to treat myoclonus is still being researched.

Medications

Medical practitioners commonly prescribe the following drugs for myoclonus:

• Tranquilizers: Clonazepam also referred to as Klonopin, is the most frequently prescribed drug for the treatment of myoclonus symptoms. Fatigue and lack of coordination are two clonazepam side effects.
• Anticonvulsion drugs: Treatment for epileptic seizures with medication may reduce myoclonus symptoms. For myoclonus, the most often used anticonvulsants include levofracetam , valproic acid, zonisamide , and primidone. Although piracetam is not available for sale in the US, it is another anticonvulsant that is beneficial. One of the adverse effects of valproic acid is nausea. Among the negative effects of levetiracetam that could happen are fatigue and dizziness. Nausea and vomiting are one of the possible side effects of primidone.

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