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Botox is known for its use in the cosmetics industry but it's also used with people whose muscle tone is affected by conditions like cerebral palsy and dystonia. Botox can treat spasticity where people have very tight muscles or fluctuating muscle tone. It can also help with urinary difficulties or drooling.
Botulinum Toxin A (BTA) is a muscle relaxant derived from the bacterium Clostridium Botulinum. Although this bacteria can be poisonous, when used in small, controlled doses, it can provide safe, effective relief from a number of conditions. BTA has been successfully used to treat muscular conditions in children and adults for over 20 years. Clinical studies and trials have indicated positive and helpful results.
BTA is effective on muscle tone in various parts of the body such as the arms and hands (if grip is an issue) or around the orbital (eye) area for dystonia affecting eye movement. But mostly it's used on the lower limbs to aid standing and walking.
Many children who have difficulty with movement due to tight muscle tone will walk on the balls of their feet with the heel off the ground. The feet may also turn inwards. This makes it difficult, or impossible, to place the foot flat on the floor.
When injected into the calf or lower leg muscles, BTA can relax these muscles. This makes walking easier and more comfortable. It can also improve balance and reduce falls.
Tightness in the hamstring muscles at the back of the thigh makes it difficult to straighten legs. This can result in a crouch or squat gait. Injection with BTA can help straighten the legs and improve walking, sitting and transferring. BTA also works well on the adductor muscles in the hip and groin area. This is a common problem area for children with spastic cerebral palsy.
High muscle tone in the hip and groin makes it difficult to keep the legs apart. This is called scissoring. For those with upper limb spasticity, BTA can reduce muscle tone around the elbow, wrist and thumb areas, enabling the arm to straighten. This can help with personal care and hygiene. It can also improve pinching, grasping and releasing movements.
BTA can also reduce secondary problems. Spasticity can create an imbalance in muscle tone across a joint that not only interferes with movement but can also lead to fixed contractures (permanent shortening of the muscle and tendon), bony abnormalities and joint instability such as hip dislocation.
If surgery occurs too early, the child may need to have repeat or other surgery as they grow. Lowering the tone of the more active muscles by using BTA can:
BTA has also been used for:
Treatment may delay or reduce the need for orthopaedic surgery. If used before adductor release surgery, it can reduce post-operative pain and the length of stay in hospital. Many surgeons use BTA to reduce painful spasms after operations. It can protect soft tissue from involuntary movement until the healing process is complete.
Many teenagers and adults with cerebral palsy report a high level of satisfaction with the cosmetic improvement that BTA can bring to their appearance as well as the comfort from reduction of tone and spasm, even where there has been no significant change in function or movement.
Tiredness can often be a problem for disabled people due to the increased effort required in moving around. As movement becomes more fluid following BTA treatment, there is often a reduction in energy consumption.
Muscles contract and relax as a result of chemical messages from the brain. Problems can occur when the chemical messengers are blocked or do not connect with specific muscles. This chemical is called acetylcholine.
When BTA is injected into the muscle, the release of acetylcholine is blocked, resulting in a relaxation of overactive muscles. The injections generally take effect within a few days and last for several months.
Physiotherapy is also part of the treatment and to aid effectiveness of the injection.
Usually the medical team may include a consultant, paediatrician, paediatric neurologist or orthopaedic surgeon, and a physiotherapist. An orthotist or occupational therapist may also be present.
If your walk on tip toe or turn your feet inward, the assessment may involve a detailed movement study (gait analysis), which is often filmed.
After a full examination, the team will decide whether the treatment is appropriate for you or your child and which muscles will be injected. You should get a clear idea of the expected outcome of the treatment.
Although BTA is becoming more common, not all NHS Trusts will fund it. As with all medical treatments, you should ask your GP or consultant to refer you.
An anaesthetic cream may reduce any discomfort from the injection. Oral sedation, or sometimes a local or general anaesthetic may be used, especially if the individual is very young and/or anxious, or where the area to be injected is difficult to access.
The muscles to be injected are identified by manual palpation, ultrasound, electromyography (EMG) or stimulation of the nerve.
The amount of BTA used is determined by the size and number of muscles to be treated, the degree of tightness in the muscle and the weight of the patient, up to a maximum recommended dose. Injections in several muscles during the one treatment are common.
Following the injection, there are various ways to maximise the effects of BTA. These include:
A follow-up appointment will assess the success of the injections. On average the interval between injections varies from between 6 to 9 months. Doctors may recommend re-injection when muscle tone begins to interfere with function rather than when it returns to pre-injection levels. There is no limit to the number of re-injections.
In the main, reported side-effects of Botulinum Toxin A (BTA) are mild and short-lived. They include:
The Medicines and Healthcare Products Regulatory Industry advises you to be alert to reactions from the spread of the toxin.
Seek immediate medical attention if any of these problems develop, from soon after treatment to several weeks afterwards.
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