Parkinson's Disease - Treatment modalities for a quality life

Parkinson's disease (PD) is a medical condition in which parts of the brain become progressively damaged over many years. Symptoms include muscle rigidity, tremors (or shaking), and changes in speech and gait. The cause of PD is unknown but genetics, aging, and toxins are being researched. After a diagnosis of Parkinson’s disease, treatments are given to help relieve symptoms. There is no cure for Parkinson's itself, but studies on using stem cells to treat are under way. The prognosis of Parkinson's Disease depends on the patient's age and symptoms. Now let us look at the treatment of PD in more detail.

Treatment of Parkinson's Disease

There's currently no cure for Parkinson's disease, but treatments are available to help relieve the symptoms and maintain your quality of life. These treatments include:
  • supportive therapies – such as physiotherapy, occupational therapy, etc
  • medication
  • surgery (for some people)
You may not need any treatment during the early stages of Parkinson's disease as symptoms are usually mild. However, you may need regular appointments with your doctor or specialist so your condition can be monitored. Specialists you may be referred to are either a neurologist or a geriatrician.

A care plan should be agreed with your healthcare team and your family or carers. This will outline the treatments and help your needs now and what you are likely to need in the future, and should be reviewed regularly.

Supportive therapies

There are several therapies that can make living with Parkinson's disease easier and help you deal with your symptoms on a day-to-day basis.

1). Physiotherapy

A physiotherapist can work with you to relieve muscle stiffness and joint pain through movement (manipulation) and exercise.
The physiotherapist aims to make moving easier, and improve your walking and flexibility. They also try to improve your fitness levels and ability to manage things for yourself.

2). Occupational therapy

An occupational therapist can identify areas of difficulty in your everyday life – for example, dressing yourself or getting to the local shops. They can help you work out practical solutions, and ensure your home is safe and properly set up for you. This will help you maintain your independence for as long as possible.

3). Speech and language therapy

Many people with Parkinson's disease have swallowing difficulties (dysphagia) and problems with their speech. A speech and language therapist can often help you improve these problems by teaching speaking and swallowing exercises, or by providing assistive technology.

4). Diet advice

For some people with Parkinson's disease, making dietary changes can help improve some symptoms. These changes can include:
  • increasing the amount of fibre in your diet and making sure you're drinking enough fluid to reduce constipation
  • increasing the amount of salt in your diet and eating small, frequent meals to avoid problems with low blood pressure, such as dizziness when you stand up quickly
  • making changes to your diet to avoid unintentional weight loss
You may see a dietitian, a healthcare professional trained to give diet advice, if your care team thinks you may benefit from changing your diet.

Medications

Medication can be used to improve the main symptoms of Parkinson's disease, such as shaking (tremors) and movement problems.
However, not all the medications available are useful for everyone, and the short- and long-term effects of each are different.

Three main types of medication are commonly used:
  • levodopa
  • dopamine agonists
  • monoamine oxidase-B inhibitors
Your specialist can explain your medication options, including the risks associated with each medication, and discuss which may be best for you. Regular reviews will be required as the condition progresses and your needs change.

1). Levodopa

Most people with Parkinson's disease eventually need a medication called levodopa.

Levodopa is absorbed by the nerve cells in your brain and turned into the chemical dopamine, which is used to transmit messages between the parts of the brain and nerves that control movement. Increasing the levels of dopamine using levodopa usually improves movement problems.

It is usually taken as a tablet or liquid, and is often combined with other medication, such as benserazide or carbidopa. These medications stop the levodopa being broken down in the bloodstream before it has a chance to get to the brain. They also reduce the side effects of levodopa, which include:
  • feeling sick (nausea) or vomiting
  • tiredness
  • dizziness
If you're prescribed levodopa, the initial dose is usually very small and will be gradually increased until it takes effect.

At first, levodopa can cause a dramatic improvement in the symptoms. However, its effects can be less long-lasting over the following years – as more nerve cells in the brain are lost, there are fewer of them to absorb the medicine. This means the dose may need to be increased from time to time.

Long-term use of levodopa is also linked to problems such as uncontrollable, jerky muscle movements (dyskinesias) and "on-off" effects, where the person rapidly switches between being able to move (on) and being immobile (off).

2). Dopamine agonists

Dopamine agonists act as a substitute for dopamine in the brain and have a similar but milder effect compared with levodopa. They can often be given less frequently than levodopa. They are often taken as a tablet, but are also available as a skin patch (rotigotine). Sometimes dopamine agonists are taken at the same time as levodopa, as this allows lower doses of levodopa to be used.

Possible side effects of dopamine agonists include:
  • nausea or vomiting
  • tiredness and sleepiness
  • dizziness
Dopamine agonists can also cause hallucinations and increased confusion, so they need to be used with caution, particularly in elderly patients, who are more susceptible. For some people, dopamine agonists have been linked to the development of compulsive behaviours, especially at high doses, including addictive gambling and an excessively increased libido.

Talk to your healthcare specialist if you think you may be experiencing these problems. As the person themselves may not realise the problem, it's key that carers and family members also note any abnormal behaviour and discuss it with an appropriate professional at the earliest opportunity.

If you're prescribed a course of dopamine agonists, the initial dose is usually very small to prevent nausea and other side effects. The dosage is gradually increased over a few weeks. If nausea becomes a problem, your doctor or GP may prescribe anti-sickness medication.

A potentially serious, but uncommon, complication of dopamine agonist therapy is sudden onset of sleep. This generally happens as the dose is being increased and tends to settle once the dose is stable. People are usually advised to avoid driving while the dose is being increased in case this complication occurs.

3). Monoamine oxidase-B inhibitors

Monoamine oxidase-B (MAO-B) inhibitors, including selegiline and rasagiline, are another alternative to levodopa for treating early Parkinson's disease. They block the effects of an enzyme or brain substance that breaks down dopamine (monoamine oxidase-B), increasing dopamine levels.

Both selegiline and rasagiline can improve the symptoms of Parkinson's disease, although their effects are small compared with levodopa. They can be used alongside levodopa or dopamine agonists.

MAO-B inhibitors are generally very well tolerated, but can occasionally cause side effects, including:
  • nausea
  • headache
  • abdominal pain
  • high blood pressure

4). Catechol-O-methyltransferase inhibitors

Catechol-O-methyltransferase (COMT) inhibitors are prescribed for people in later stages of Parkinson's disease. They prevent levodopa from being broken down by the enzyme COMT.

Side effects of COMT inhibitors include:
  • nausea or vomiting
  • diarrhoea
  • abdominal pain

Non-oral therapies

When Parkinson's symptoms become difficult to control with tablets alone, a number of other treatments can be considered.

1). Apomorphine

A dopamine agonist called apomorphine can be injected under the skin (subcutaneously) either by:
  • a single injection, when required
  • a continuous infusion using a small pump carried around on your belt, under your clothing, or in a bag

2). Duodopa

If you have severe on-off fluctuations, a type of levodopa called duodopa may be used. This medication comes as a gel that's continuously pumped into your gut through a tube inserted through your abdominal wall. There's an external pump attached to the end of the tube, which you carry around with you.

In the UK, about 25 specialist neuroscience centres offer this treatment. This treatment can only be offered if you have very severe on-off fluctuations or involuntary movements.

Surgery

Most people with Parkinson's disease are treated with medication, although a type of surgery called deep brain stimulation is used in some cases. Deep brain stimulation involves surgically implanting a pulse generator similar to a heart pacemaker into your chest wall. A tiny electric current is produced by the pulse generator, which runs through the wire and stimulates the part of your brain affected by Parkinson's disease.

Although surgery doesn't cure Parkinson's disease, it can ease the symptoms for some people. This surgery is also available in specialist neuroscience centres in the UK, the USA and other countries, but it's not suitable for everyone.

If surgery is being considered, your specialist will discuss the possible risks and benefits with you.

Treating additional symptoms

As well as the main symptoms of movement problems, people with Parkinson's disease can experience a wide range of additional symptoms that may need to be treated separately. These include:
  • depression and anxiety – this can be treated with self care measures such as exercise, psychological therapy or medication;
  • problems sleeping (insomnia) – this can be improved by making changes to your normal bedtime routine;
  • erectile dysfunction – this can be treated with medication;
  • excessive sweating (hyperhidrosis) – this can be reduced using a prescription antiperspirant, or surgery in severe cases;
  • swallowing difficulties (dysphagia) – this can be improved by eating softened food, or by using a feeding tube in more severe cases;
  • excessive drooling – this can be improved with swallowing exercises, or surgery or medication in severe cases
  • urinary incontinence – this can be treated with exercises to strengthen the pelvic floor muscles, medication, or surgery in severe cases;
  • dementia – this can be treated with cognitive therapies and medication in some cases;

Complementary and alternative therapies

Some people with Parkinson's disease find complementary therapies help them feel better. Many complementary treatments and therapies claim to ease the symptoms of Parkinson's disease. However, there's no clinical evidence they're effective in controlling the symptoms of Parkinson's disease.

Most people think complementary treatments have no harmful effects. However, some can be harmful and they shouldn't be used instead of the medicines prescribed by your doctor. Some types of herbal remedies, such as St John's wort, can interact unpredictably if taken with some types of medication used to treat Parkinson's disease.

If you're considering using an alternative treatment along with your prescribed medicines, check with your doctor, specialist or care team first.



Reference:
1). NHS Choices: Parkinson's disease. Accessed 01.07.2010. Available here: http://www.nhs.uk/Conditions/Parkinsons-disease/Pages/Introduction.aspx
2). US Library of Medicine (PubMed Health). Parkinson's: Overview. Accessed 12.09.2017. Available here: https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0076679/
3). U.S. Department of Health and Human Services. Parkinson's Disease. Accessed 13.09.2017. Available here: https://www.report.nih.gov/NIHfactsheets/ViewFactSheet.aspx?csid=109

Article first written 01/07/2010. Rewritten 12/09/2017

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