Factors involved in clot formation
About half the people who develop abnormal blood clots have an inherited tendency to do so. Other factors that may cause unwanted clots to form include:
* Surgery. Operations are one of the leading causes of problem blood clots, especially operations to replace major joints, such as the hip and knee. Although people slated for high-risk operations are treated with anti-clotting drugs both before and after surgery, many still develop clots.
* Long periods of inactivity. Inactivity caused by prolonged bed rest or long plane or car trips decreases blood flow in your veins, making clots more likely. People who are immobilized after surgery, a heart attack or serious injuries are more apt to develop blood clots and pulmonary embolism than are people who are able to get up and walk around. In fact, the highest incidence of pulmonary embolism occurs among people in hospitals, where it's the third-leading cause of death. In recent years, attention has also focused on the increasing incidence of deep vein thrombosis and pulmonary embolism among otherwise healthy travelers on long plane trips. Cramped seats with little leg room have contributed to the problem — so much so that deep vein thrombosis is sometimes referred to as "economy class syndrome." Not everyone who has DVT goes on to develop pulmonary embolism, however. For many people, the DVT causes few symptoms and is diagnosed long after the episode has passed.
* Increased levels of clotting factors in the blood. Some types of cancer, especially pancreatic, lung and ovarian cancers, cause increased blood levels of procoagulants — substances that contribute to blood clotting. The female hormone estrogen found in birth control pills and hormone therapy (HT) also increases the amount of clotting factors in the blood.
* Certain medical conditions. People who have cardiovascular disease associated with clot formation, such as heart attack (myocardial infarction) or stroke, are more likely to develop blood clots in their veins.
* Injury to the veins. This may occur during certain surgical procedures, especially hip surgery or knee replacement. It may also result from direct injuries to the legs or from leg or pelvic fractures.
KINDLY DO YOUR HOME WORK IN FUTURE, UNLESS INEVITABLE.
2007-07-31 09:14:18
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answer #1
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answered by Dr.Qutub 7
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Risks for DVT include prolonged sitting (such as on long plane or car trips) or bedrest. It also may be caused by recent surgery (especially hip, knee, or female reproductive organ surgery), fractures, childbirth within the last 6 months, and the use of medications such as estrogen and birth control pills.
Risks also include overproduction of red blood cells in bone marrow (polycythemia vera), cancerous (malignant) tumor, and having a condition in which the blood is more likely to clot (hypercoagulability).
Deep venous thrombosis is most common in adults over age 60, but it can occur in any age group.
Please see the web pages for more details on Deep venous thrombosis.
2007-07-31 05:53:56
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answer #2
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answered by gangadharan nair 7
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unless some kind of pre - disposing illness eg - malignancy, hyper coagulation, heart failure, etc main cause is prolonged immobility.
Part of the circulatory system involves muscles in lower legs being able to squeeze the veins ( deep veins ) to allow blood to be forced upwards towards the heart. If the muscles not being used will not squeeze and assist the veins - the returning blood to the heart will become sluggish and eventually stagnant - causing clot formation.
Risk factors are bed rest, sitting for long periods, long haul flights, short flights, etc etc. Other risk factors include following a fracture, lengthy surgey, diabetics and older people.
2007-07-31 06:56:51
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answer #3
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answered by thinxnfinx 2
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There are actually not any destructive aspects or factor effects from taking homeopathic arrangements. The function of homeopathic therapy is to stimulate a therapeutic reaction from the physique. no count number if hcg arrangements can quite set off weight-loss is a distinctive tale, yet you do not ought to difficulty approximately dvt etc.
2016-10-01 02:47:37
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answer #4
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answered by ? 4
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prolonged sitting
certain arrhythmia's, such as atrial fibrillation
Anything that causes your blood to pool and form a clot.
2007-07-31 07:55:12
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answer #5
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answered by yo? 5
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