heart attack

Wednesday, October 7, 2009

What is Coronary Heart Disease (CHD)?

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What is Coronary Heart Disease (CHD)?
Coronary heart disease is the name given to the disease process called artherosclerosis that causes the smooth inside lining of the coronary arteries to become narrowed by fatty deposits, sometimes called 'plaques' or 'artheroma'. Coronary heart disease is often referred to as CHD but can also sometimes be called:
1.Coronary artery disease or CAD
2.Ischeamic heart disease IHDThis process of depositing fatty material (artheroma) in the blood vessels is called 'arterosclerocis'. When this happens in the coronary arteries it causes Coronary Heart Disease, causing the coronary arteries to narrow.

When the arteries become narrowed it gets more difficult for the blood to reach all areas of the heart muscle. It also makes the blood more likely to clot.

Tuesday, October 6, 2009

The heart also contains valve's which ensure that the blood flows through the heart in the right direction


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The heart also contains valve's which ensure that the blood flows through the heart in the right direction
The cardiovascular system is the medical name given to the heart (cardio) and blood vessels (vascular) in the body.

Just like other organs and muscles in the body, the heart needs it's own blood supply to provide the heart with oxygen and other nourishing substances. These are carried to the heart by blood vessels called 'coronary arteries'.

Monday, October 5, 2009

The Heart and Blood Vessels

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The Heart and Blood Vessels
Your heart is a muscle about the size of your fist. The heart pumps blood through a network of blood vessels to the lungs where it picks up oxygen. The 'oxygen rich' blood is then returned to the heart so it can be pumped onto the organs and tissues throughout your body.

There are two main types of blood vessels which carry blood:

'arteries' carry the oxygen rich blood from the heart to the organs and tissues
'vein's' transport the blood back to the heart from the organs and tissues

heart diseases


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heart diseases
In the United States in the next year, about 1.5 million citizens will suffer a 'heart attack', and for about one third of them it will be fatal. In New Zealand, about 8000 deaths a year a attributed to heart disease, and most of these (about 6600 in 1994) are due to ischaemia. Heart disease is a phenomenon of a 'Western' life style, associated with malnutrition, in the sense of poor dietary habits, lack of exercise and the use of drugs such as nicotine. To understand the nature of heart disease it is necessary to understand first the structure and function of the heart.

The human heart is a remarkable organ. Its essential function is to pump blood at high pressure to the rest of the body, thus providing the energy for conveying oxygen, foodstuffs and endocrine substances to where it is needed, and removing waste products of metabolism from their site of production to the kidneys and lungs, where they can be removed. The heart makes about 70 contractions per minute throughout life, pumping about 5 litres of blood per minute around the body. During extreme exercise the output of the heart can increase fivefold. The gross anatomy of the heart is shown in the picture below.

Sunday, October 4, 2009

WHO publishes definitive atlas on global heart disease and stroke epidemic

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WHO publishes definitive atlas on global heart disease and stroke epidemic
23 SEPTEMBER 2004 | GENEVA -- The atlas of heart disease and stroke, graphically detailing a global epidemic that is the leading single cause of death worldwide, was launched here today, to coincide with World Heart Day, Sunday 26 September 2004. The atlas is expected to provide a powerful advocacy tool to stimulate vital action and help promote constructive decision-making by governments, policymakers, national and international organisations, health professionals, individuals and families everywhere.

The atlas is published by the World Health Organization (WHO), in conjunction with the USA's Centers for Disease Control and Prevention (CDC) of the U.S. Department of Health and Human Services, and is strongly supported by NGOs such as the World Heart Federation (WHF).



Heart disease and stroke chart [gif 116kb]
Heart disease and stroke kill some 17 million people a year, which is almost one-third of all deaths globally. By 2020, heart disease and stroke will become the leading cause of both death and disability worldwide, with the number of fatalities projected to increase to over 20 million a year and by 2030 to over 24 million a year.

"The old stereotype of cardiovascular diseases affecting only stressed, overweight middle-aged men in developed countries no longer applies," said Dr Robert Beaglehole, WHO Director of Chronic Diseases and Health Promotion. "Today, men, women and children are at risk and 80% of the burden is in low- and middle-income countries. Heart disease and stroke not only take lives, but also cause an enormous economic burden. The atlas should be a significant new resource for global advocacy and education activity."

Dr Judith Mackay, co-author of the atlas with CDC's Dr George Mensah, said: “No matter what advances there are in high-technology medicine, the fundamental message is that any major reduction in deaths and disability from heart disease and stroke will come primarily from prevention, not just cure. This must involve robust reduction of risk factors, through encouraging our children to adopt healthy lifestyle habits and by introducing appropriate policies and intervention programmes.”

For the first time in one publication, the atlas captures updated data for each country, which is depicted through colourful maps, photographs and images and provides risk factor statistics for the occurrence of high blood pressure, tobacco, physical inactivity, obesity, lipids and diabetes. The diverse elements of this global epidemic including risk factors, similarities and differences between countries, the economic burden, prevention, policies and legislation, treatment and predictions are chronicled. A world data table is also published for the first time and gives statistics for each country, including the number of healthy life years lost to heart disease and stroke, the prevalence of smoking and the status of policies and legislation.

“While heart disease and stroke are eminently preventable, decision-makers and government funding agencies are, overall, neglecting this public health issue,” said Janet VoĆ»te, CEO, WHF, an NGO dedicated to the global prevention of heart disease and stroke. “The WHF strongly endorses the atlas as a valuable resource for global advocacy and educational activity to fight the heart disease and stroke epidemic. We know how to reduce the burden of heart disease and stroke, but what is needed now is the combination of necessary resources and political will by each country to take effective action."

The atlas is being launched to coincide with World Heart Day, which is a major driving force for encouraging global heart disease and stroke prevention. The focus this year is Children, Adolescents and Heart Disease, because children are increasingly adopting unhealthy lifestyles. Obesity, poor diets, smoking and physical inactivity, the leading causes of heart disease and stroke, are now being seen at an alarmingly early age. Around 100 countries will take part in this, the fifth annual, World Heart Day, with member societies organising educational activities for everyone to get involved. Thousands of people around the world will join one of the walks, runs, jump rope or fitness sessions, have a health check or learn about heart-healthy lifestyles from the public talks, scientific forums and exhibitions.

Saturday, October 3, 2009

heart diseases


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heart diseases
Heart diseases are number one killer in the world. There are many different forms of heart diseases. Mostly heart diseases are caused due to narrowing or blockage of the coronary arteries, the blood vessels that supply blood to the heart. This heart disease is called coronary artery disease and happens slowly over time. This blockage causes major heart attacks.

The problem that happens with heart is valve problem. In this problem, heart may not pump well and cause heart failure. Some people are born with this kind of heart disease.

Friday, October 2, 2009

ischemic heart disease

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ischemic heart disease
Apart from chest pain, other symptoms that accompany Ischemic Heart Disease include back pain, pressure in the chest area, shortness of breath, and extreme fatigue. Pain from angina is usually known to radiate down a person’s left arm, jaw and back. This type of pain is worsened by any form of exercise, but relieved by periods of rest. Usually the pain may be accompanied by excessive sweating.

Other signs that accompany ischemia include obesity, thyroid and vascular disease, anemia, and tendon xanthomas, a thickening in the Achilles tendon.

Ischemia Heart Disease may also result in sudden death, also known as a massive heart attack. Nearly 250,000 people succumb to sudden cardiac death each year. This fatal condition is caused by ventricular fibrillation, an abnormal heart rhythm that renders the heart unable to contract, resulting in a cessation of blood flow to the brain as well as other vital organs of the body. Unless immediate CPR is performed or electric shock delivered via a defibrillator, a person suffering from this condition is likely to die.

The doctor will subject the patient to an exercise stress test while the patient is wearing a Holter monitory. This battery-operated tape recorder is a portable electrocardiogram that reads a person’s heart movements for a period of 24 to 48 hours in order to detect ischemia.

The doctor may also order an echocardiogram to check for any abnormalities in the heart’s chambers and to assess the efficiency of the heart’s pumping action. Myocardial perfusion scanning is also useful in diagnosing ischemia, as is having a coronary angiogram taken to accurately pinpoint the extent and location within the coronary arteries that experience hardening and narrowing.

One other diagnostic tool that makes use of imaging technology is nuclear myocardial imaging, which utilizes radioactive tracers to monitor the journey of the blood towards the heart muscle.

There are various therapies geared at treating Ischemic Heart Disease. Doctors may describe nitrates that work to dilate coronary arteries that have narrowed. When placed under the tongue, they can relieve chest pain in minutes. Other medications, such as Isosorbide Mononitrate and Isosorbide Dinitrate are prophylactics that prevent the occurrence of pain.

Pain relief may also be achieved my reducing the demand for oxygen and decreasing a person’s heart rate through the use of Beta-blockers. Calcium channel antagonists are able to dilate constricted blood vessels, as well as lower a person’s excitability, blood pressure, and cholesterol levels. Daily aspirin intake is known to thin the blood and prevent platelets from forming into blood clots.

Surgery is a last resort option if medical therapy has failed to relieve a person’s ischemia symptoms. This is particularly true if an angiogram result reveals significant levels of blockage in the blood vessels. These surgical procedures include Coronary Angioplasty, a process of dilating a congested blood vessel by inflating a balloon within the blood vessel itself. Coronary Artery Bypass Grafting, meanwhile, involves replacing part of a deceased artery with soft tissue grafted from the patient’s body.

A patient who has been diagnosed with Ischemic Heart Disease will need to make certain lifestyle changes in order to ward off symptoms of ischemia. These lifestyle changes will include avoiding stress, smoking, a high fat diet, and a sedentary lifestyle.