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Heart Disease is the Leading cause of Death in the USA
Heart Disease: Definition, Causes, Research
Written by Christian Nordqvist Knowledge center
Last updated: Thu 7 April 2016
MNT Knowledge Center
Heart disease is an umbrella term for any type of disorder that affects the heart. Heart disease means the same as cardiac disease but not cardiovascular disease. Cardiovascular disease refers to disorders of the blood vessels and heart, while heart disease refers to just the heart.
According to WHO (World Health Organization) and the CDC, heart disease is the leading cause of death in the UK, USA, Canada and Australia. The number of US adults diagnosed with heart disease stands at 26.6 million (11.3% of adult population).1
23.5% of all deaths in the USA today are caused by heart disease.2
We take a look at some of the most common examples of heart disease below.
Also known as angina pectoris, angina occurs when an area of heart muscle does not get enough oxygen. The patient experiences chest discomfort, tightness or pain. Angina is not technically a disease, but rather a symptom of coronary artery disease. Lack of oxygen to the heart muscle is usually caused by the narrowing of the coronary arteries because of plaque accumulation (atherosclerosis).
Arrhythmia is an irregular heartbeat.
Tachycardia is when the heart beats too fast
Bradycardia is when the heart beats too slowly
Premature contraction is when the heart beats too early
Fibrillation is when the heart beat is irregular
Arrhythmias are problems with heart-rhythm. They happen when the heart's electrical impulses that coordinate heartbeats do not work properly, making the heart beat in a way it should not, either too fast, slowly or erratically.
Irregular heartbeats are common, we all experience them. They feel like a fluttering or a racing heart. However, when they veer too far from normal heartbeat or occur because of a damaged or weak heart, they need to be taken more seriously and treated. Irregular heartbeats can become fatal.
Diagram of the human heart
Diagram of the heart. Blue parts indicate de-oxygenated blood pathways while red parts indicate oxygenated pathways
Congenital heart disease
This is a general term for some birth defects that affect how the heart works. Congenital means you are born with it. In the UK it is estimated that 1 in every 1,000 babies are born with some kind of congenital heart disease. Examples include:
Septal defects - there is a hole between the two chambers of the heart. This condition is sometimes called hole in the heart.
Obstruction defects - the flow of blood through various chambers of the heart is partially or even totally blocked
Cyanotic heart disease - not enough oxygen is pumped around the body because there is a defect (or some defects) in the heart.
Coronary artery disease
The coronary arteries, which supply the heart with nutrients, oxygen and blood become diseased or damaged, usually because of plaque deposits (cholesterol-containing deposits). Plaque accumulation narrows the coronary arteries and the heart gets less oxygen.
In this disorder the heart chambers become dilated because the heart muscle has become weak and cannot pump blood properly. The most common reason is not enough oxygen reaching the heart muscle (ischemia) due to coronary artery disease. Usually the left ventricle is affected.
Also known as heart attack, cardiac infarction and coronary thrombosis. Interrupted blood flow (lack of oxygen) damages or destroys part of the heart muscle. This is usually caused by a blood clot that develops in one of the coronary arteries (blood vessels that supply the heart with blood). It can also occur if an artery suddenly narrows (spasm).
Also known as congestive heart failure. The heart does not pump blood around the body efficiently. The left or right side of the body might be affected; sometimes both sides are. Coronary artery disease or hypertension (high blood pressure) can over time leave the heart too stiff or weak to fill and pump properly.
A genetic disorder in which the wall of the left ventricle becomes thick, making it harder for blood to leave the heart. The heart has to work harder to pump blood. This is the leading cause of sudden death in athletes. A father or mother with hypertrophic cardiomyopathy has a 50% chance of passing the disorder onto their children.
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