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Heart attack (myocardial infarction), is a state where a sudden restriction or termination of blood flow to the heart, which causes the heart muscle (myocardium) dies from lack of oxygen.
Myocardial infarction
CAUSE
A heart attack usually occurs when a blockage in a coronary artery results in limited or cut off blood flow to a part of the heart.
If the interruption or reduction in blood flow lasted more than a few minutes, then the heart tissue will die.
Cardiac pumping ability after a heart attack is directly related to the extent and location of tissue damage (infarct).
If more than half of cardiac tissue is damaged, the heart usually can not function and the possibility of death. Even though the damage was not extensive, the heart can not pump properly, resulting in heart failure or shock.
Damaged heart can be enlarged, and partly an attempt to compensate for cardiac pumping ability is declining (due to greater heart will beat more powerful).
The enlarged heart is also a picture of the damage to heart muscle itself. Enlargement of the heart after a heart attack provides a poorer prognosis.
Other causes of heart attack are:
- A clot from the heart itself.
Sometimes a clot (embolus) is formed inside the heart, then broke and stuck in the coronary arteries.
- Seizures in the coronary arteries that causes cessation of blood flow.
Seizures can be caused by drugs (like cocaine) or by smoking, but sometimes the cause is unknown.
Myocardial infarction
CAUSE
A heart attack usually occurs when a blockage in a coronary artery results in limited or cut off blood flow to a part of the heart.
If the interruption or reduction in blood flow lasted more than a few minutes, then the heart tissue will die.
Cardiac pumping ability after a heart attack is directly related to the extent and location of tissue damage (infarct).
If more than half of cardiac tissue is damaged, the heart usually can not function and the possibility of death. Even though the damage was not extensive, the heart can not pump properly, resulting in heart failure or shock.
Damaged heart can be enlarged, and partly an attempt to compensate for cardiac pumping ability is declining (due to greater heart will beat more powerful).
The enlarged heart is also a picture of the damage to heart muscle itself. Enlargement of the heart after a heart attack provides a poorer prognosis.
Other causes of heart attack are:
- A clot from the heart itself.
Sometimes a clot (embolus) is formed inside the heart, then broke and stuck in the coronary arteries.
- Seizures in the coronary arteries that causes cessation of blood flow.
Seizures can be caused by drugs (like cocaine) or by smoking, but sometimes the cause is unknown.
Posted in: Heart Attack
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