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Thrombosis prevention

Thrombosis prevention or thromboprophylaxis is medical treatment to prevent the development of thrombosis in those considered at risk for developing thrombosis. Some people are at a higher risk for the formation of blood clots than others, such as those with cancer undergoing a surgical procedure. Prevention measures or interventions are usually begun after surgery as the associated immobility will increase a person's risk.

Pathophysiology of blood clot prevention
The development of blood clots can be interrupted and prevented by the use of medication, changing risk factors, and other interventions. Some risk factors can be modified. These would be losing weight, increasing exercise, and the cessation of oral contraceptives. Moving during periods of travel is a modifiable behavior. Preventing blood clots includes medications that interrupt the complex clotting cascade and changing the proteins needed for clotting. Antiplatelet drugs also have an effect in preventing the formation of clots. ==Medical treatments==
Medical treatments
Thrombosis prophylaxis is not only used for the prevention of deep vein thrombosis but can be initiated for the prevention of the formation of blood clots in other organs and circumstances unrelated to deep vein thrombosis: • cerebral complications • abortion • ectopic pregnancymolar pregnancy • pregnancy • childbirth and the puerperiumcoronaryportal vein thrombosis • intracranial, nonpyogenic • intraspinal, nonpyogenic • mesentericpulmonary ==Epidemiology of developing blood clots==
Epidemiology of developing blood clots
The risk of developing deep vein thrombosis, or pulmonary embolism is different than the total risk of the formation of blood clots. This is due to the observation that not all blood clots form in the lower legs. Most hospitalized medical patients have at least 1 risk factor for thrombosis that progresses to thromboembolism and this risk persists weeks after discharge. Those who remain undiagnosed and not treated prophylactically have a 26% chance of developing a fatal embolism. Another 26% develop another embolism. Between 5% and 10% of all in-hospital deaths are due to pulmonary embolism (as a consequence of thrombosis). Estimates of the incidence of pulmonary embolism in the US is 0.1% persons/year. Hospital admissions in the US for pulmonary embolism are 200,000 to 300,000 yearly. Thrombosis that develops into DVT will affect 900,000 people and kill up to 100,000 in the US. On average 28,726 hospitalized adults aged 18 and older with a VTE blood clot diagnosis die each year. Risk of thrombosis is related to hospitalization. The type of surgery performed prior to the formation of blood clots influences the risk. Without prophylactic interventions, the calculated incidence of clot formation in the lower leg veins after surgery is: • 22% for neurosurgery • 26% for abdominal surgery • 45% for 60% in orthopedic surgery • 14% for gynecologic surgery As the population of the US ages, the development of blood clots is becoming more common.{{cite web | first1 = Peter K. | last1 = Henke | first2 = Mark H. | last2 = Meissner | first3 = Thomas W. | last3 = Wakefield | name-list-style = vanc | title = Chapter 2: Risk Factors for Venous Thrombosis |publisher= American Venous Forum ==General risks and indications for blood clot prevention==
General risks and indications for blood clot prevention
Some risk factors for developing blood clots are considered higher than others. One scoring system analyzes the probability of clot formation by assigning a point value system to significant risk factors. The benefit of treating those who are at low risk of developing blood clots may not outweigh the higher risks of significant bleeding. :: ==Risk for subsequent blood clots==
Risk for subsequent blood clots
Developing blood clots is more probable after the first episode. Risk assessment and intervention for those with one or more episodes of deep vein thrombosis or blood clots in the veins utilize the Well's test. It has been inconsistently modified by several publishers with the results listed below: Well's and modified Well's risk scoring Adapted for the emergency department Scoring: • less than 2 points – low risk (3%) • 2–6 points moderate risk (17%) • > 6 points high risk (75%) ==General interventions==
General interventions
The Centers for Disease Control and Prevention have issued general guidelines describing the interventions that can be taken to reduce the risk of the formation of blood clots: {{Quote box|width=75em|align=center|quote=The Centers for Disease Control and Prevention recommend the following: • Move around as soon as possible after being confined to bed, such as after surgery, illness, or injury. • If you're at risk for DVT, talk to your doctor about: • Graduated compression stockings (sometimes called "medical compression stockings") • Medication (anticoagulants) to prevent DVT. • When sitting for long periods, such as when traveling for more than four hours: • Get up and walk around every 2 to 3 hours. • Exercise your legs while you're sitting by: • Raising and lowering your heels while keeping your toes on the floor • Raising and lowering your toes while keeping your heels on the floor • Tightening and releasing your leg muscles • Wear loose-fitting clothes. • You can reduce your risk by maintaining a healthy weight, avoiding a sedentary lifestyle, and following your doctor's recommendations based on your individual risk factors. Interventions for those hospitalized Compression devices Mechanical compression devices are used to prevent thrombosis and are beneficial enough to be used by patients at low to moderate risk. The use of intermittent pneumatic compression is common. Differences between the use of thigh-high compression stockings and shorter types to prevent blood clots exist, but remain inconsistent. Immediate post-surgical interventions, such as out of bed orders (OOB), are typically ordered by the physician to prevent thrombosis. These orders, typically delegated to a nurse, but may include the participation of a physical therapist and others trained to perform the intervention, are to perform range of motion (ROM) activities that include: muscle contractions of the lower legs for those who are very weak, moving the feet, wiggling the toes, bending the knees, raise and lower the legs. In addition, changes in positioning prevent immobility and shift areas of venous stasis. If the person is too weak to perform these preventative activities, hospital personnel will perform these movements independently. Exercise of the lower extremities is a post-operative method of prophylaxis. Nursing personnel will often perform a range of motion exercises and encourage frequent moving of the legs, feet, and ankles. Frequent positioning changes and adequate fluid intake. After a surgical procedure, ambulation as soon as possible is prophylactic in preventing the formation of blood clots. Early ambulation also prevents venous stasis and physicians order OOB activities on the same day of surgery. This is accomplished in increments. The progression of increasing mobility proceeds by: raising the head of the bed, sitting up in bed, moving to the edge of the bed, dangling the legs off the bed, and then ambulating to a closed chair. Patient education and compliance reduce the risk of developing blood clots. These exercises and the use of equipment and follow-up by clinicians reduce the risk of developing blood clots. If a blood clot has already formed in the deep veins of the leg, early movement out of bed is usually prescribed, except in some severe cases of deep vein thrombosis or in people who have phlegmasia cerulea dolens. The treatment to prevent blood with physical intervention (e.g., sequential compression device) is contraindicated. ==Medication==
Medication
Anticoagulants and antiplatelets Thromboprophylaxis, such as anticoagulants or perioperative heparin, is effective for hospitalized patients at risk for VTE. Extended use of low molecular weight heparin (LMWH) for at least 14 days after abdominal or pelvic surgery was shown to reduce the risk of venous thromboembolism without increasing bleeding complications or mortality. :::: The discontinuation of contraceptives also prevents blood clots. Herbal interactions The therapeutic effects of warfarin may be decreased by valerian. Chamomile can affect the action of anticoagulants. Dong quai, garlic, ginger, Ginkgo biloba, bilberry, and feverfew can increase bleeding time. These same herbal supplements taken with warfarin increased prothrombin time. Dietary interactions By containing significant content of vitamin K, some foods act as antagonists to antiplatelet and anticoagulant medications; these include green leafy vegetables, like spinach, legumes, and broccoli. Contraindications Preventing blood clots with medication is not considered safe in the following circumstances: • uncooperative patient • recent childbirth • gastrointestinal bleedingreproductive system bleeding • genitourinary systembleeding • hemorrhagic blood dyscrasias • peptic ulcersalcohol use disorder • infection • eye surgerybrain surgeryspinal cord surgery • recent intracranial hemorrhage ==Research==
Research
An international registry and risk assessment calculator is being used to centralize data on post-surgical venous thrombosis and its prevention.{{cite web | title = Computerized Registry of Patients with Veneous Thromboembolism — RIETE Registry |publisher=S & H Medical Science Service| url = https://www.riete.org/info/estimate-calculator/index.php == References ==
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