Coronary Heart Disease And Its Treatments Biology Essay


In todays society, people are advancing their knowledge in the medical field at quite a fast pace. Treatments, cures, and vaccines for various diseases and disorders are being developed constantly, and yet, coronary heart disease remains the number one killer in the world. However it seems in today's society a heart attack simply is not interesting enough. They would rather know about who overdosed or who was killed with a gun. What a lot of people are not realizing is that coronary heart disease actually accounts for about 80% of all sudden deaths (Hoffman1). In actuality, heart disease causes a third of all total deaths in the world (Bryg 1). The publics' eyes need to be opened to the fact that there are ways to stop such a large amount of people from passing away due to coronary heart disease.

One of the symptoms of coronary heart disease is angina pectoris or in basic terms, chest pain. Many people, however, do not take this symptom very seriously. They simply do not know that it can lead to other complications or in some cases, death. Heart attacks occur when a blood clot suddenly and completely blocks a diseased coronary artery, resulting in the death of the heart muscle cells supplied by that artery (Congenital Heart Disease). When a heart attack is reported by the media they use medical terms like Coronary Thrombosis or Acute Myocardial Infarction, which is just a fiancé was of saying heart attack. Unless someone has a PhD in the medical field that person is very unlikely to know what these terms mean, making ignoring the early symptoms very easy. On the other hand sudden death occurs due to cardiac arrest which may be the first symptom of coronary artery disease and this can come without a preoccuring issue. Other causes of sudden deaths include drowning, suffocation, electrocution, drug overdose, trauma (car crash), and stroke. Drowning, suffocation, and drug overdose usually cause respiratory arrest which in turn cause cardiac arrest. Trauma may cause sudden death by severe injury to the heart or brain, or by severe blood loss. Stroke causes damage to the brain which can cause respiratory arrest and/or cardiac arrest. People with coronary artery disease, whether or not they have had a heart attack, may experience irregular chest pain, pressure, or discomforts. This situation is known as angina pectoris. It occurs when the narrowing of the coronary arteries temporarily prevents an adequate supply of blood and oxygen to meet the demands of working heart muscles. Angina Pectoris (from angina meaning strangling, and pectoris meaning breast) is commonly known simply as angina and means pain in the chest. The term angina was first used during a lecture in 1768 by Dr. William Heberden. The word was not intended to indicate pain, but rather strangling, with a secondary sensation of fear. Victims suffering from angina may experience pressure, discomfort, or a squeezing sensation in the centre of the chest behind the breastbone. The pain may radiate to the arms, the neck, even the upper back, and the pain may come and go. It occurs when the heart is not receiving enough oxygen to meet an increased demand. Angina, as mentioned before, is only temporarily, and it does not cause any permanent damage to the heart muscle.

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However, the underlying coronary heart disease continues to progress unless actions are taken to prevent it from becoming worse. There are several risk factors that contribute to the development of atherosclerosis and angina: Family history, Diabetes, Hypertension, Cholesterol, and Smoking. We all carry approximately 50 genes that affect the function and structure of the heart and blood vessels. Genetics can determine one's risk of having heart disease. There are many cases today where heart disease runs in a family, for many generations. Diabetics are at least twice as likely to develop angina as non-diabetics, and the risk is higher in women than in men. Diabetes causes metabolic injury to the lining of arteries; as a result, the tiny blood vessels that nourish the walls of medium-size arteries throughout the body, including the coronary arteries, become defective. These microscopic vessels become blocked, impeding the delivery of blood to the lining of the larger arteries, causing them to deteriorate, and artherosclerosis results. High blood pressure directly injures the artery lining in several ways. The increased pressure compresses the tiny vessels that feed the artery wall, causing structural changes in these tiny arteries. Microscopic fracture lines then develop in the arterial wall. The cells lining the arteries are compressed and injured, and can no longer act as an adequate barrier to cholesterol and other substances collecting in the inner walls of the blood vessels.

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Cholesterol has become one of the most important issues in the last decade. Reducing cholesterol intake can directly decrease one's risk of developing heart disease, and people today are more conscious of what they eat, and how much cholesterol their foods contain. Cholesterol causes atherosclerosis by progressively narrowing the arteries and reducing blood flow. The building up of fatty deposits actually begins at an early age, and the process progresses slowly. By the time the person reaches middle-age, a high cholesterol level can be expected.

It has been proven that about the only thing smoking does is shorten a person's life. Despite all the warnings by the Surgeon General, people still manage to find an excuse to quit smoking. Cigarette smoke contains carbon monoxide, radioactive polonium, nicotine, arsenious oxide, benzopyrene, and levels of radon and molybdenum that are twenty times the allowable limit for ambient factory air. The two agents that have the most significant effect on the cardiovascular system are carbon monoxide and nicotine. Nicotine has no direct effect on the heart or the blood vessels, but it stimulates the nerves on these structures to cause the secretion of adrenaline. The increase of adrenaline and noradrenaline increases blood pressure and heart rate by about 10% for an hour per cigarette. In simpler words, nicotine causes the heart to beat harder. Carbon monoxide, on the other hand, poisons the normal transport systems of cell membranes lining the coronary arteries. This protective lining breaks down, exposing the under-surface to the tearing of the passing blood, with all its clotting factors as well as cholesterol.

There are some medications developed over the years to help slow the deterioration of the heart by heart disease. These medications have different pros and cons and any person considering taking them should weigh their options carefully. Nitroglycerine, which is the basis of dynamite, relaxes the smooth fibers of the blood vessels, allowing the arteries to dilate. They have a tendency to produce flushing and headaches because the arteries in the head and other parts of the body will also dilate. Glyceryl trinitrate is a short-acting drug in the form of small tablets. It is taken under the tongue for maximum and rapid absorption since that area is lined with capillaries. It usually relieves the pain within a minute or two. One of the drawbacks of trinitrates is that they can be exposed too long as they deteriorate in sunlight. Trinitrates also come in the form of ointment or transversal sticky patch which can be applied to the skin. Denigrates and mononitrates are used for the prevention of angina attacks rather than as pain relievers. They are slower acting than trinitrates, but they have a more prolonged effect. They have to be taken regularly, usually three to four times a day. Denigrates are more common than trinitrates or tetra nitrates. Beta-blockers are used to prevent angina attacks. They reduce the work of the heart by regulating the heart beat, as well as blood pressure; the amount of oxygen required is thereby reduced. These drugs can block the effects of the stress hormones adrenaline and noradrenaline at sites called beta receptors in the heart and blood vessels. These hormones increase both blood pressure and heart rate. Other sites affected by these hormones are known as alpha receptors. There are side effects, however, for using beta-blockers. Further reduction in the pumping action may drive to a heart failure if the heart is strained by heart disease. Hands and feet get cold due to the constriction of peripheral vessels. Beta- blockers can sometimes pass into the brain fluids, and causes vivid dreams, sleep disturbance, and depression. There is also a possibility of developing skin rashes and dry eyes. Some beta- blockers raise the level of blood cholesterol and triglycerides.

There are new drugs being developed constantly. Pexid, for example, is useful if other drugs fail in severe angina attacks. However, it produces more side effects than others, such as pins and needles and numbness in limbs, muscle weakness, and liver damage. It may also precipitate diabetes, and damages to the retina. When medications or any other means of treatment are unable to control the pain of angina attacks, surgery is considered. There are two types of surgical operation available: Coronary Bypass and Angioplasty. The bypass surgery is the more common, while angioplasty is relatively new and is also a minor operation. Surgery is only a last resort to provide relief and should not be viewed as a permanent cure for the underlying disease, which can only be controlled by changing one's lifestyle. The bypass surgery involves extracting a vein from another part of the body, usually the leg, and uses it to construct a detour around the diseased coronary artery. This procedure restores the blood flow to the heart muscle. Although this may sound risky, the death rate is actually below 3 percent. This risk is higher, however, if the disease is widespread and if the heart muscle is already weakened. If the grafted artery becomes blocked, a heart attack may occur after the operation. The number of bypasses depends on the number of coronary arteries affected. Coronary artery disease may affect one, two, or all three arteries. If more than one artery is affected, then several grafts will have to be carried out during the operation. About 20 percent of the patients considered for surgery have only one diseased vessel. In 50 percent of the patients, there are two affected arteries, and in 30 per cent the disease strikes all three arteries. These patients are known to be suffering from triple vessel disease and require a triple-bypass.

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Triple vessel disease and disease of the left main coronary artery before it divides into two branches are the most serious conditions. Angioplasty is a relatively new procedure, and it is known in full as transluminal balloon coronary angioplasty. It entails squashing the atherosclerotic plaque with balloons. A very thin balloon catheter is inserted into the artery in the arm or the leg of a patient under general anaesthetic. The balloon catheter is guided under x-ray just beyond the narrowed coronary artery. Once there, the balloon is inflated with fluid and the fatty deposits are squashed against the artery walls. The balloon is then deflated and drawn out of the body. This technique is a much simpler and more economical alternative to the bypass surgery. The procedure itself requires less time and the patient only remains in the hospital for a few days afterward. Exactly how long the operation takes depends on where and in how many places the artery is narrowed. It is most suitable when the disease is limited to the left anterior descending artery, but sometimes the plaques are simply too hard, making them impossible to be squashed, in which case a bypass might be necessary.

It is truly shocking on how little focus Coronary Heart Disease gets considering the amount of people this disease affects. The general public needs to be informed on this very important issue. Coronary heart disease accounts for four out of every five sudden deaths, yet it never makes the headlines.