Dominic Stone
Clonic seizures are characterised by repeated jerking movements of the arms and legs, sometimes on both sides of the body. They are caused by the fast stiffening and relaxing of a muscle that happens repeatedly. This is known as clonus (KLOH-nus). Clonic seizures are rare and most commonly occur in babies, though they can happen at any age. They can be frightening to experience or observe, and often the person suffering the seizure will need to rest afterwards. So, do clonic seizures weaken muscles?
Characteristics and Values Table for Clonic Seizures
| Characteristics | Values |
|---|---|
| Definition | Fast stiffening and relaxing of a muscle that happens repeatedly |
| Other names | Clonic (KLON-ik) seizures, jerking movements |
| Frequency | Rare |
| Occurrence | Most common in babies |
| Part of the body affected | Arms and legs, sometimes on both sides of the body |
| Consciousness | The person may be aware during a focal onset seizure, but not during a generalized onset seizure |
| Fall | A person may fall if they are standing when a clonic seizure occurs |
| Post-seizure activity | The person may continue their activity, especially if they were aware during the seizure. If not fully aware, they may need to rest for a few minutes |
| Treatment | Long-term treatment may be required if the seizure does not go away on its own |
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What You'll Learn
Tonic-clonic seizures can cause muscle weakness and soreness
Tonic-clonic seizures, formerly known as "grand mal" seizures, are the most recognised type of seizure. They involve two phases: the tonic phase, which involves the stiffening of muscles, and the clonic phase, which involves twitching or jerking. These seizures can cause muscle weakness and soreness.
During the tonic phase, the person loses consciousness and may fall. Strong spasms in the muscles can force air out of the lungs, resulting in a cry or moan. The person may bite their tongue or the inside of their cheek, causing blood to appear in their saliva. The stiffness of the chest muscles may also impair breathing, and their face may turn bluish or gray.
The clonic phase involves rapid and rhythmic jerking movements of the arms and legs, bending and relaxing at the elbows, hips, and knees. This phase usually lasts a few seconds to a couple of minutes, after which the jerking slows and stops, and the body relaxes. The person may lose control of their bladder or bowel.
After a tonic-clonic seizure, the person may feel confused, exhausted, sore, sad, or embarrassed for a few hours. They may not remember having a seizure and may experience memory loss. It is common to feel tired and confused after a clonic seizure, and the person may need to rest before returning to their usual activities.
Tonic-clonic seizures can be treated through medication, nerve stimulation, dietary therapy, or surgery. They can occur in both children and adults, and in some cases, children may outgrow their epilepsy.
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Clonic seizures are characterised by repeated jerking movements
Clonic seizures are a type of seizure that affects the muscles. They are distinct from tonic seizures, which cause a stiffening of the muscles, and tonic-clonic seizures, which involve both the stiffening and jerking phases of muscle activity. Tonic-clonic seizures, formerly known as "grand mal" seizures, are the most recognised type of seizure and can be frightening to experience or observe. They can cause a person to lose consciousness, cry out, and bite their tongue or the inside of their cheek.
Clonic seizures can sometimes be mistaken for myoclonic seizures, which involve a quick muscle jerk or twitch. They can also be confused with jitteriness in infants, which can be reduced by changing the baby's arm or leg position. However, a jittery infant will be more alert than one experiencing a clonic seizure.
If a clonic seizure does not stop on its own, long-term treatment may be required. Treatment for clonic seizures may include medication, nerve stimulation, dietary therapy, surgery, or a combination of these approaches. If a clonic seizure turns into a tonic-clonic seizure, the person will likely be tired and confused afterward and should be allowed to rest.
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Tonic seizures cause stiffness and tension in muscles
Clonic seizures are characterised by repeated jerking movements of the arms and legs, sometimes on both sides of the body. Clonic seizures are rare and most commonly occur in babies. They can, however, occur in people of all ages, including newborns and infants.
Tonic seizures, on the other hand, cause stiffness and tension in the muscles of the arms, legs, or body. The name "tonic" comes from "'muscle tone'," which refers to the muscle's normal tension at rest. During a tonic seizure, the tone is greatly increased, and the body, arms, or legs become suddenly stiff or tense. Tonic seizures are often brief, lasting less than a minute, and they usually happen during sleep. They can cause a person to fall if they occur while standing.
Tonic-clonic seizures, formerly known as grand mal seizures, combine the characteristics of both tonic and clonic seizures. They involve a tonic phase, where the muscles stiffen, and a clonic phase, where the body begins to jerk rapidly and rhythmically. During the tonic-clonic seizure, the person loses consciousness and may fall, and their muscles may feel sore afterward.
If you think you or someone you know may be experiencing clonic or tonic seizures, it is important to seek medical advice as soon as possible.
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Seizures can last from a few seconds to a few minutes
Clonic seizures involve fast, repeated jerking movements of the arms and legs, sometimes on both sides of the body. These seizures are rare and most commonly occur in babies, though they can occur in people of all ages. They can last from a few seconds to a few minutes.
Clonic seizures are characterised by rhythmic jerking movements that cannot be stopped by restraining or repositioning the arms or legs. They can occur as a standalone phenomenon or as part of a tonic-clonic seizure, which is the modern term for a grand mal seizure. Tonic-clonic seizures involve a tonic phase of stiffening, followed by a clonic phase of jerking movements.
The duration of a clonic seizure can vary depending on whether it occurs in isolation or as part of a tonic-clonic seizure. When occurring in isolation, clonic seizures typically last for a few seconds to a minute. On the other hand, when clonic seizures are part of a tonic-clonic seizure, they can last for seconds to 1-2 minutes.
Tonic-clonic seizures are the most recognised type of seizure, involving intense muscle spasms and often affecting breathing. They usually last for a few minutes, with jerking movements slowing and stopping after one to three minutes. However, it is important to note that if a seizure lasts for more than five minutes, it is considered a medical emergency, and immediate medical assistance is required.
The impact of clonic seizures on muscle weakness is not explicitly mentioned in the sources. However, given the nature of the seizures, it is possible that the affected muscles may experience some degree of fatigue or soreness following the seizure activity. Additionally, the person experiencing the seizure may feel tired, confused, or embarrassed afterward, requiring rest and supportive care.
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Seizure treatment includes medication, nerve stimulation, and surgery
Clonic seizures are characterized by fast, repeated jerking movements of the arms and legs, sometimes affecting both sides of the body. These seizures are rare and predominantly occur in babies, often as part of a tonic-clonic seizure. The person experiencing a clonic seizure may fall if they are standing and will likely feel tired and confused afterward, requiring rest.
Seizure treatment can include medication, nerve stimulation, and surgery. Here are the details of each treatment option:
Medication
There are various medications available for treating seizures, and the specific prescription depends on the patient's seizure type, allergies, and potential side effects. For example, Brivaracetam, sold under the brand name Briviact, and Cannabidiol oral solution, also known as CBD and sold as Epidiolex, are two possible medications. Another is Carbamazepine-XR, an "extended-release" form of carbamazepine.
Nerve Stimulation
Vagus nerve stimulation (VNS) has been explored as a treatment for epilepsy. Studies in rats have shown that VNS can significantly reduce seizure severity. In these experiments, a cuff electrode was implanted on the left vagal branch, and VNS or sham stimulation was applied while inducing seizures. The results indicated that VNS effectively suppressed seizures. However, further research is needed to optimize the stimulation parameters for awake subjects and humans.
Surgery
In some cases, surgery may be considered for seizure treatment. For example, during VNS implantation surgery, transient asystole may occur during intraoperative testing, but careful monitoring has revealed no clinically relevant effects on cardiac function. While surgery can be an option, it is important to consider the potential risks and benefits for each patient.
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Frequently asked questions
Clonic seizures are characterised by repeated jerking movements of the arms and legs, sometimes on both sides of the body. They are caused by the fast stiffening and relaxing of a muscle that happens repeatedly. Clonic seizures are rare and most commonly occur in babies.
It is important not to restrain the person or put anything in their mouth. Move furniture or other items out of the way to protect them from injury. Time the seizure and call for emergency help if it lasts for more than five minutes.
Clonic seizures are intense and can be frightening to experience or observe. After a clonic seizure, a person may feel tired, confused, and their muscles may feel sore. However, there is no evidence to suggest that clonic seizures weaken muscles.
