The Detailed Overview of Huntington's Disease

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The Detailed Overview of Huntington’s Disease

There are many diseases out in the world that are affecting peoples lives in different ways. They can either be an infectious or a non-infectious disease. A non- infectious disease would be Huntingtons disease which is inherited. It causes a severe breakdown of nerve cells of the brain. The parts of the brain that get damage are the basal ganglia, cerebral cortex the frontal and temporal lobes, ventricles, and caudate nuclei. This disease is most frequently found in people with European ancestry and its is less common in people with Japanese, Chinese, and African ancestry. About 3 out of 7 per 100,000 people that have European genes are affected by Huntington’s disease according to U.S. National Library of Medicine. It doesn’t matter whether a patient is a women or a man because anyone can get HD. A person can experience symptoms at the age of 30 to 50 years of age and they can also come at the early age of 20 which is referred to juvenile HD. According to statistics more than 30,000 Americans have Huntingtons disease. The reason that this disease is developed in a human is the mutation in the gene of a protein named huntingtin which causes cytosine, adenine, and guanine building blocks of DNA to replicate a more times than it should. A child with a parent that has HD has a fifty fifty, possibility of inheriting the disease. Now a person who does not inherit HD can not get the disease and cant pass it onto future generations.

George Huntington, American physician from Long Island, New York was the one to contribute to the explanation of HD which was named after him in 1872. Huntington wrote a paper called On Chorea which was later published in the Medical and Surgical Reporter of Philadelphia and became known for Huntington’s Chorea. Huntington’ Chorea evolved through the years and is even known today as huntingtons Disease. In the year of 1933 a research group found the gene of HD, because of this discovery it is possible to diagnose a person through the use of their blood and tissue samples.

Huntingtons disease occurs from the mutation in the gene that is located on chromosome 4. Every person has this gene and has the CAG repeat sequence. When someone has HD, their CAG sequence has a high number of repeats which is a result of protein that has a long polyglutamine sequence. The regular huntingtin gene contains 17 to 20 repetitions of the code of its total of 3,100. The number of repeats that adults with HD have is more than 40 and for people who have juvenile HD usually have more than 60 CAG repeats. Depending if one has a big number of triplet repeats the more it is likely to develop HD at an early stage of life. A father passing the gene to his child might extend the gene even more, starting the disease at an early age. For those who contain 27 to 35 repeats dont develop Huntingtons disease but there is a slight possibility that their children will get the disorder.

The symptoms of this disease varies for each person, but HD does cause psychiatric, cognitive, and movement problems. Depression is an example of a psychiatric effect that Huntington’s disease causes. It occurs because of the injury the brain goes through and changes in the functions of the brain. Other psychiatric disorders are obsessive compulsive disorder, mania, and bipolar disorder. Some signs include feeling irritable, sadness, social withdraw, insomnia, fatigue, and frequent thoughts of suicide. For cognitive disorders people may experience difficulty organizing or focusing on tasks, people may tend to get stuck on a thought or on an action. When someone is talking they may forget what they just said and not be able to come up with a response as fast as a person who doesnt have HD can. People also are not aware of their own behavior and are slow at processing thoughts and have difficulty learning new information. Huntingtons disease effects ones movement ability which can be involuntary movement problems and the damage in voluntary movements. This includes involuntary jerking or writhing movements, muscle problems like rigidity, slow eye movements, difficulty with posture and balance, and having a hard time with speech and swallowing. Once a person starts having symptoms of Huntingtons disease the duration can be from ten to thirty years. According to the Huntingtons Disease Society of America, Huntingtons Disease manifests as a triad of motor, cognitive, and psychiatric symptoms which begin insidiously and progress over many years, until the death of the individual. The average length of survival after clinical diagnosis is typically 10-20 years, but some people have lived thirty or forty years. Late stage HD may last up to a decade or more. Voluntary movements are really impactful on an individual’s ability to work, act, and communicate.

The symptoms for younger people who have Juvenile Huntington’s disease are a little different than those of adults. Juvenile HD is not as common as adult HD itself. People have behavioral changes like losing academics or physical skills, a decrease in school performance, and behavioral problems. They also suffer in physical changes that include contracted muscles that affect their walking ability, changes in motor skills like their handwriting, seizures, and involuntary shaking. Weight loss is another factor that is affected because of HD. When a young person has to go through these symptoms they may experience anger, sadness, and fear, leading to aggressiveness. Children who inherit Juvenile Huntingtons disease get their sequence repeats from their fathers however they can inherit it from their mothers even though it is rare. The life span for individuals with Juvenile HD is no more than 10 to 15 years after they begin experiencing symptoms. This affects young person daily life from attending school to having a job and even their chance of creating a family in fear of passing the gene of HD on to them.

There are five stages to Huntingtons disease progression. The first stage is considered the early stage, from when it starts it can last up to about eight years. During this stage the person has been diagnosed with HD but can function at home and in the workplace. They still have independence and can do activities own their own like managing their finances, home responsibilities, eating on their own, getting dressed, bathing, and so much more other things. Patients usually dont experience movement problems but can experience cognitive symptoms as well as psychiatric symptoms. The second stage is the early intermediate stage. It can last up to three to thirteen years from the first day of HD onset. The individual can still function at their workplace but not to the same ability they first began with when they did not have HD. They are somewhat able to do daily life activities but have some difficulties which requires them to have some help from others. However at this stage some may be incapable to work and need a lot of assistance in one certain activity but are fully capable to complete other activities. Involuntary movement in the body which is called Chorea becomes present in this stage. In the third stage the, late intermediate stage can last up to five and sixteen years. An individual cant maintain house responsibilities or work any longer. They will also need significant help for finances, responsibilities in their home and activities they have in their daily lives. Their thinking ability weakens and some psychiatric symptoms become more prominent like anxiety, irritation, and they become more impulsive. Dementia is also is a disorder they can get this far into the disease. Not only does the psychiatric worsen but so does cognitive symptoms. The second to last stage is called the early advanced stage which lasts from nine to twenty-one years. They are no longer independent and can still stay living in their homes with the help of family members or with professional help. Facilities home can provide them better assistance in their needs and daily activities. They will require a lot help in all their activities and be aware of what they have to do. The last stage, the fifth stage, is called the advanced stage. The duration for this stage is eleven to twenty six years. They need a 100% help from a nurse and Chorea gets toned down. Although Chorea lessens Parkinsonism intensifies which causes slowness,unusual posture, stiffness, and grinding of the teeth. There is a more probability of accidents like falling and as it states in Huntingtons Disease News Speech can become difficult at this stage and the patient may go through periods of confusion and screaming. The ability to swallow also can worsen, and there can be extreme fluctuations in blood pressure and temperature.

People with Huntingtons disease die fifteen to twenty years after being diagnosed and they die because of a complication of this disease. These life threatening complications are pneumonia and heart disease. Huntingtons disease patients have a bigger chance of choking causing respiratory problems, they can get gastrointestinal problems like cancer in the pancreas. As stated in the excerpt titled Complications of Huntingtons Disease As a result of these movements, the epiglottis a flap that acts as a valve in our throat, prevents food from entering the airway. People with HD often lack this coordination, and food will accidentally enter the respiratory tract, leading to choking. Moreover, when food particles manage to get into the trachea (the wind pipe leading to the lungs), instead of the esophagus (the food pipe leading to the stomach), the lungs can become infected and cause what is known as aspiration pneumonia. As stated this is one complication that leads to the death of a person with Huntingtons disease. One can prevent this from happening by adjusting the diet of the patient to a make sure they have a more appropriate intake of the right food. A study that took place in the years of 1952 until 1979 in Victoria, Australia showed that 51% of patients that had HD, died from getting pneumonia.

There is no cure for this that can backtrack or slow down the symptoms to this disease, however there is medication that helps with symptoms. Some of these medications are Tetrabenazine which is accepted by the Food and Drug Administration, treats involuntary jerking movements or chorea. Side effects do come with this medication and they are feeling sad, losing interest in relationships with others, either sleeping more or less than one should, feeling angry, and weight loss. With these side effects the patient should contact a doctor. Medication that controls movements and hallucinations are clonazepam, haloperidol, and clozapine. Depression is one of the symptoms that Huntingtons disease cause, so to ease that there is fluoxetine (Prozac), sertraline (Zoloft), nortriptyline (Pamelor). Many patients with HD experience mood phases and to lessen that they can take mood- stabilizing drugs.

To help a patients speaking ability there is a choice of doing speech therapy as well as other types of therapy to help with their different necessities. Psychotherapy helps the individual to be able to control their aggressive behavior and they are demonstrated strategies to communicate with others. Speech therapy helps better their speech and exercises the muscles that have to do with the mouth and throat. For physical therapy the therapist helps the patient gain strength in their muscles which improves their ability to walk and their balance. They also provide them with techniques on posture and how to properly use a walker or a wheelchair. Lastly occupational therapy can help the patient with HD, their family or caregivers. They teach them about equipment they can use to help assist the patient.

There are six different types of ways a person with HD can get tested to see if they carry the gene for it. The first one is the neurological examination were a neurologist asks a series of questions and does tests to be able to examine their abilities. They test their movements, their senses, and their feelings. Another test is the neuropsychological testing that has to do with the patients memory. Mentality, and reasoning. The next one will be the psychiatric evaluation which is in relation with behavior, emotions, and their thinking. Brain imaging and function is another form of testing that show the structure of the brain and how it is functioning. It can be an MRI or a CT scan. They will show how the brain has changed and how it has been affected by Huntingtons disease. There is genetic counseling to test out their genetics if they have the defective gene.

Lastly there is predictive genetic testing for those whose family members have had this disease but they themselves dont show any signs, symptoms of having HD. Some people prefer to do this type of testing so they know what is to come and know whether they have the disease so they are able to decide if they want to have children and start a family knowing the risks there could be.

For families and patients there are organizations that are nonprofit that equip caregivers with information and services. There are also organizations that provide programs and care for individuals with Huntingtons disease.

To recap all this information Huntingtons disease is caused by an abnormal repeat of a gene that makes protein which helps neurons in particular parts of the brain. The protein from the repeated gene causes the diminishing of the nerve cells rather than creating them. They then become less over a period of time. Each area of the brain have to do with thinking, movements, mental health, and learning. There are many changes that the body experiences during different stages of this disease. Some people are affected differently and have different symptoms than others but there is some medication to help subdue the difficulties they pass having Huntingtons disease.

A person can start experiencing symptoms at an early age as well as at an old age. Women and men have the same probability of inheriting HD, also people who have European ancestry. There is five stages that each patient goes through while living with this disease. The person that has Huntingtons disease has the dominant gene. People who inherit the repeated gene are likely to start experiencing symptoms at a later stage in their lives. Some want to get tested so they can know what is to come and start preparing for their medical necessities. There are voluntary movements and involuntary movements that are caused because of HD. According to Huntingtons Disease Facts and Statistics by Nadia Khan Huntingtons disease occurs in three out of every 100,000. It is a genetic disease so the parent has to pass it on to their children in order for them to inherit HD. Huntingtons disease is found on chromosome 4.

Huntingtons disease causes the brain to lessen in its weight. Once a person has had HD for a lot of years the brain could lose thirty percent of all of its weight. According to statistics an adult brain is most likely to be three pounds. Over the years the brain may weigh up to only one pound which is not a good thing.

The gene of Huntingtons disease gives directions to make protein to which is called huntingtin. Huntingtons disease affects many parts of the body and some can lead to other disorders. These disorders can be depression when an individual finds out that they in fact have this disease. Another would be obsessive- compulsive disorder and being bipolar. Emotions change and so does their behavior towards others who might try to help.

As mentioned previously younger people can get HD but its not known for a lot of people to get it at a young age. It could sometimes be misunderstood by others that the way they behave and the symptoms they have is just regular teenage behavior. There is a chance that they go through extreme weight loss from the lack of wanting to eat food.

There is a slight difference in adult huntingtons disease and juvenile huntingtons disease. For example in teenagers it can affect their school work and their attitude towards school leading them to do bad and to not have interest in it. They can get affected in their movements, writing, thinking, have many moods, and can even get seizures. The disease doesnt get any better after it is diagnosed making the patient suffer and have difficulty in activities they were able to do before the disease progressively worsened. One way that could help a person with Huntingtons disease is through therapy which has many other choices that deal with different topics. They include speech therapy, physical therapy, and occupational therapy, and lastly psychotherapy.

There are some ways that someone with Huntingtons disease can prevent their kids from getting the disease. People who are fearful on passing the gene because of previous members who have had the disease can do genetic testing and try to do family planning options.

For a couple who doesn’t want to pass the gene on to their newborn they can chose to do a vitro fertilization which is when eggs are discarded from the ovaries then it is fertilized with the sperm the father produces. They then test the embryos to see which has inherited the Huntington repeated gene and to check which dont have it to chose those to insert in the female’s uterus.

Huntington’s disease has five stages. The first stage is the early stage and the patient is not really affected or experiencing any of the symptoms. They go throughout their day doing their daily activities, going to work, doing their finances. The second stage is the earl intermediate stage were they can work in the workplace but at a slower rate and can do parts of daily activities but might need assistance in performing certain things. The third is the late intermediate stage were the person cant work or do household chores. They will need assistance in their daily activities. Their thinking slows down and their behavior towards others gets bad. The fourth stage is the early advanced stage where the patient requires a lot of help from a nurse to do activities but they will be conscious of what they need to get done. The last step wis the advanced stage where they cant practically do anything by themselves and swallowing becomes hard for them .Huntington’s disease has no cure but there is medication to help with some of the symptoms. It affects an individual in their abilities to perform different tasks. Its the breakdown of nerve cells which affects how the brain functions.

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