Materiały źródłowe

• #1 Deep vein thrombosis (DVT) – Symptoms & causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/deep-vein-thrombosis/symptoms-causes/syc-20352557

  Deep vein thrombosis (DVT) occurs when a blood clot (thrombus) forms in one or more of the deep veins in the body, usually in the legs. […] You can get deep vein thrombosis (DVT) if you have certain medical conditions that affect how the blood clots. A blood clot in the legs can also develop if you don’t move for a long time. […] The main causes of deep vein thrombosis (DVT) are damage to a vein from surgery or inflammation and damage due to infection or injury. […] Anything that prevents the blood from flowing or properly clotting can cause a blood clot.

• #2 Deep Vein Thrombosis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK507708/

  A deep-vein thrombosis (DVT) is a blood clot that forms within the deep veins, usually of the leg, but can occur in the arms and the mesenteric and cerebral veins. […] Following are the risk factors that are considered causes of deep venous thrombosis: Reduced blood flow: Immobility (bed rest, general anesthesia, operations, stroke, long flights) […] Increased venous pressure: Mechanical compression or functional impairment leading to reduced flow in the veins (neoplasm, pregnancy, stenosis, or congenital anomaly which increases outflow resistance) […] Mechanical injury to the vein: Trauma, surgery, peripherally inserted venous catheters, previous DVT, intravenous drug abuse […] Increased blood viscosity: Polycythaemia rubra vera, thrombocytosis, dehydration […] Anatomic variations in venous anatomy can contribute to thrombosis.

• #3 Deep vein thrombosis: pathogenesis, diagnosis, and medical management – Stone – Cardiovascular Diagnosis and Therapy

  https://cdt.amegroups.org/article/view/16872/html

  Deep vein thrombosis (DVT) is a major preventable cause of morbidity and mortality worldwide. […] Virchows Triad distills the multitude of risk factors for DVT into three basic elements favoring thrombus formation: venous stasis, vascular injury, and hypercoagulability. […] The clinical conditions most closely associated with DVT are fundamentally related to the elements of Virchows Triad; these include surgery or trauma, malignancy, prolonged immobility, pregnancy, congestive heart failure, varicose veins, obesity, advancing age, and a history of DVT. […] Other risk factors for clot formation include cancer, oral contraceptives, obesity, and advancing age. Malignancy can exert a compressive effect on veins contributing to stasis. […] Taken together, thrombosis formation is a dynamic, multicausal process that hinges on a fine balance of physical and biochemical factors.

• #4 Deep vein thrombosis – Wikipedia

  https://en.wikipedia.org/wiki/Deep_vein_thrombosis

  Deep vein thrombosis (DVT) is a type of venous thrombosis involving the formation of a blood clot in a deep vein, most commonly in the legs or pelvis. The mechanism behind DVT formation typically involves some combination of decreased blood flow, increased tendency to clot, changes to the blood vessel wall, and inflammation. Risk factors include recent surgery, older age, active cancer, obesity, infection, inflammatory diseases, antiphospholipid syndrome, personal history and family history of VTE, trauma, injuries, lack of movement, hormonal birth control, pregnancy, and the period following birth. VTE has a strong genetic component, accounting for approximately 50 to 60% of the variability in VTE rates. Genetic factors include non-O blood type, deficiencies of antithrombin, protein C, and protein S and the mutations of factor V Leiden and prothrombin G20210A. In total, dozens of genetic risk factors have been identified.

• #5 Deep Venous Thrombosis (DVT): Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1911303-overview

  Numerous factors, often in combination, contribute to DVT. These may be categorized as acquired (eg, medication, illness) or congenital (eg, anatomic variant, enzyme deficiency, mutation). A useful categorization may be an acute provoking condition versus a chronic condition, as this distinction affects the length of anticoagulant therapy. […] Frequent causes of DVT are due to an increase of venous stasis due to immobilization or central venous obstruction. Immobility can be as transient as that occurring during a transcontinental airplane flight or an operation under general anesthesia. In addition, postoperative hospitalization, such as from pelvic, hip, or spinal surgery, or in patients with stroke or paraplegia, can all contribute to immobilization as well. Other risk factors include obesity, medications (eg, oral contraceptives), pregnancy, advanced age, trauma, malignancy, and genetic conditions (eg, antiphospholipid syndrome, factor V Leiden, protein C and S deficiency).

• #6 Deep Venous Thrombosis (DVT): Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1911303-overview

  Increased blood viscosity may decrease venous blood flow. This change may be due to an increase in the cellular component of the blood, as seen in polycythemia rubra vera or pathologic thrombocytosis, or simply a decrease in the fluid component from dehydration causing hemoconcentration of blood cells. […] Anatomic variants that result in diminution or absence of the inferior vena cava or iliac veins may contribute to venous stasis. In iliocaval thrombosis, an underlying anatomic contributor is identified in 60-80% of patients. The best-known anomaly is compression of the left common iliac vein at the anatomic crossing of the right common iliac artery. […] Mechanical injury to the endothelial wall appears to provide an added stimulus for venous thrombosis. For example, hip arthroplasty patients with associated femoral vein manipulation represent a high-risk group for developing DVT that cannot be explained simply by immobilization.

• #7 Deep Vein Thrombosis and Pulmonary Embolism | Yellow Book | CDC

  https://www.cdc.gov/yellow-book/hcp/travel-air-sea/deep-vein-thrombosis-and-pulmonary-embolism.html

  Deep vein thrombosis (DVT) is a condition in which a blood clot develops in the deep veins, usually in the lower extremities. […] Virchow’s classic triad for thrombus formation is venous stasis, vessel wall damage, and a hypercoagulable state. […] Prolonged, cramped sitting during long-distance travel interferes with venous flow in the legs, creating venous stasis. […] Coagulation activation can result from an interaction between air cabin conditions (e.g., hypobaric hypoxia) and individual risk factors for VTE. […] Studies indicate that long-distance air travel might increase a person’s overall risk for VTE by 2- to 4-fold, but the data are inconsistent. […] The combination of air travel with preexisting individual risk factors might synergistically increase risk. […] Most travel-associated VTE occurs in travelers with preexisting risk factors for VTE. […] For air travelers, height appears to be an additional risk factor; people 1.6 m (5 ft, 3 in) and those 1.9 m (6 ft, 3 in) tall were at increased risk. […] Immobility while flying is a risk for VTE. […] An aisle seat also might be a protective factor to reduce the risk of developing VTE.

• #8 Deep Vein Thrombosis (DVT)

  https://my.clevelandclinic.org/health/diseases/16911-deep-vein-thrombosis-dvt

  Deep vein thrombosis (DVT, also called venous thrombosis) occurs when a thrombus (blood clot) develops in veins deep in your body because your veins are injured or the blood flowing through them is too sluggish. […] These conditions can increase your risk of a deep vein thrombosis: Having an inherited (genetic) condition increases your risk of blood clots. […] More than half of all DVTs happen as a result of being in the hospital from a medical illness or following surgery. […] Not moving for long periods of time, like sitting for a long time on trips in a car, truck, bus, train or airplane or being immobile after surgery or a serious injury. […] Having a history of deep vein thrombosis in yourself or your family. […] Having cancer and some of its treatments (chemotherapy). […] Having limited blood flow in a deep vein because of an injury, surgery or immobilization. […] Being older than 40 (although a DVT can affect people of any age). […] Having overweight/obesity. […] Using tobacco products. […] Having varicose veins. […] Taking birth control pills or hormone therapy. […] Having COVID-19.

• #9 Deep Vein Thrombosis (DVT) – Heart and Blood Vessel Disorders – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/heart-and-blood-vessel-disorders/venous-disorders/deep-vein-thrombosis-dvt

  Deep vein thrombosis is the formation of blood clots (thrombi) in the deep veins, usually in the legs. […] Blood clots may form in veins if the vein is injured, a disorder causes the blood to clot, or something slows the return of blood to the heart. […] Three main factors can contribute to deep vein thrombosis: Injury to the veins lining, An increased tendency for blood to clot, Slowing of blood flow. […] Veins may be damaged during surgery or during an injury to an arm or leg, by the injection of irritating substances, by inflammation, or by certain disorders, such as thromboangiitis obliterans. […] Some disorders, such as cancer and certain inherited disorders of blood clotting, cause blood to clot when it should not. […] Some medications, including oral contraceptives, estrogen therapy, or medications that act like estrogen (such as tamoxifen and raloxifene), can cause blood to clot more readily.

• #10 Venous Thromboembolism – Deep Vein Thrombosis (DVT) | NHLBI, NIH

  https://www.nhlbi.nih.gov/health/deep-vein-thrombosis

  DVT may occur if the flow of blood slows down in your bodys deep veins, if something damages the blood vessel lining, or if the makeup of the blood itself changes so that blood clots form more easily. […] Many factors can raise the likelihood of blood clotting in the deep veins of the legs. […] DVT can occur at any age, but the chances rise as you get older. […] Some genes you inherit may raise your likelihood of developing blood clots. […] DVT can develop during a long flight or when a person is on bed rest in a nursing home, hospital setting, or after surgery. […] A blood clotting disorder, immune illnesses such as lupus, heart problems, cancer, or serious illness such as getting infected with SARS-CoV-2, the virus that causes COVID-19, can raise the likelihood of DVT. […] Women in their childbearing years are more likely than men to develop blood clots. The chance is higher for pregnant women and women who take birth control pills or get hormone therapy. After menopause, womens risk is lower than mens.

• #11 Deep Vein Thrombosis (DVT) – Heart and Blood Vessel Disorders – Merck Manual Consumer Version

  https://www.merckmanuals.com/home/heart-and-blood-vessel-disorders/venous-disorders/deep-vein-thrombosis-dvt

  Smoking is also a risk factor. […] Sometimes blood clots more readily after childbirth or surgery. […] Among older adults, dehydration commonly causes the blood to clot more readily and can therefore contribute to deep vein thrombosis. […] During prolonged bed rest and other occasions when the legs are not moving normally, blood flow slows because the person is lying down and the calf muscles are not contracting and squeezing the blood toward the heart. […] Deep vein thrombosis may develop in people who have had a heart attack or other serious disorder (such as heart failure, chronic obstructive pulmonary disease [COPD], or a stroke) and lie in a hospital bed for several days without sufficiently moving their legs or in people whose legs and lower body are paralyzed (paraplegia). […] Deep vein thrombosis can develop after major surgery, particularly pelvic, hip, or knee surgery. […] Thrombosis can even occur in healthy people who sit for long periods, for example, during long drives or airplane flights, but thrombosis is uncommon in this circumstance and usually occurs in people with other risk factors.

• #12 DVT: Causes, Warning Signs, Treatment, and Prevention of Deep Vein Thrombosis

  https://www.webmd.com/dvt/what-is-dvt-and-what-causes-it

  If blood moves too slowly through your veins, it can cause a clump of blood cells called a clot. […] The causes of DVT include things that keep blood from: […] This usually happens as a result of damage to one of your veins due to: […] Many things can raise your chances of getting DVT. […] DVT can happen at any age, but your risk is greater after age 40. […] When you sit for long stretches of time, the muscles in your lower legs stay still. […] When you’re in the hospital for a long time, this can also keep your muscles still and raise your odds of DVT. […] Carrying a baby puts more pressure on the veins in your legs and pelvis. […] People with obesity that’s a body mass index (BMI) of 30 or higher are at a higher risk. […] Conditions like inflammatory bowel disease, cancer, and heart disease can all raise your risk.

• #13 Deep Vein Thrombosis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK507708/

  A deep-vein thrombosis (DVT) is a blood clot that forms within the deep veins, usually of the leg, but can occur in the arms and the mesenteric and cerebral veins. […] Following are the risk factors that are considered causes of deep venous thrombosis: Reduced blood flow: Immobility (bed rest, general anesthesia, operations, stroke, long flights) […] Increased venous pressure: Mechanical compression or functional impairment leading to reduced flow in the veins (neoplasm, pregnancy, stenosis, or congenital anomaly which increases outflow resistance) […] Mechanical injury to the vein: Trauma, surgery, peripherally inserted venous catheters, previous DVT, intravenous drug abuse […] Increased blood viscosity: Polycythaemia rubra vera, thrombocytosis, dehydration […] Anatomic variations in venous anatomy can contribute to thrombosis.

• #14 Deep Vein Thrombosis (DVT): Symptoms, Causes, and More

  https://www.healthline.com/health/deep-venous-thrombosis

  Deep vein thrombosis (DVT) is caused by a blood clot. The clot blocks a vein, preventing blood from properly circulating in your body. […] Different factors can lead to a DVT or increase the risk of developing it. They include: […] Injury: Damage to a blood vessels wall can narrow or block blood flow. A blood clot may form as a result. […] Surgery: Blood vessels can be damaged during surgery, leading to the development of a blood clot. Bed rest with little to no movement after surgery may also increase your risk of developing a blood clot. […] Reduced mobility or inactivity: When you sit frequently, such as during a long flight, blood can collect in your legs, especially the lower parts. If you cannot move for extended periods, the blood flow in your legs can slow down. This can cause a clot to develop.

• #15 DVT: Causes, Warning Signs, Treatment, and Prevention of Deep Vein Thrombosis

  https://www.webmd.com/dvt/what-is-dvt-and-what-causes-it

  Some diseases that run in families can make your blood thicker than normal or cause it to clot more than it should. […] This could result from a broken bone, surgery, or other trauma. […] Smoking makes blood cells stickier than they should be. […] The estrogen in these raises your blood’s ability to clot. […] When in your blood, veins, or elsewhere, it could lead to DVT. […] This could be due to infection, surgery, injury, or some other root cause.

• #16 Symptoms and Causes of Deep Vein Thrombosis (DVT)

  https://thewhiteleyclinic.co.uk/conditions/deep-vein-thrombosis/symptoms-causes/

  The possible symptoms of Deep Vein Thrombosis can include: […] DVT usually affects one leg, however it can affect both. […] Sometimes (estimated to be 50% of patients) there are no symptoms and a DVT is only diagnosed if a complication occurs. […] A famous pathologist called Virchow pointed out in the 1920’s that there are 3 main causes for blood to clot when it is still in a blood vessel. These three factors are called – Virchow’s Triad. […] Things that damage the endothelial cell include smoking or low oxygen concentrations. […] The vessel wall can also change by having scars on it – such as having previous deep vein thrombosis – or bulges and narrowings of the vein walls as in varicose veins. […] Another cause for a change in the blood flow would be a change in the diameter or length of a vessel – such as found in varicose veins.

• #17 Deep Venous Thrombosis (DVT): Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1911303-overview

  Increased blood viscosity may decrease venous blood flow. This change may be due to an increase in the cellular component of the blood, as seen in polycythemia rubra vera or pathologic thrombocytosis, or simply a decrease in the fluid component from dehydration causing hemoconcentration of blood cells. […] Anatomic variants that result in diminution or absence of the inferior vena cava or iliac veins may contribute to venous stasis. In iliocaval thrombosis, an underlying anatomic contributor is identified in 60-80% of patients. The best-known anomaly is compression of the left common iliac vein at the anatomic crossing of the right common iliac artery. […] Mechanical injury to the endothelial wall appears to provide an added stimulus for venous thrombosis. For example, hip arthroplasty patients with associated femoral vein manipulation represent a high-risk group for developing DVT that cannot be explained simply by immobilization.

• #18 Patient education: Deep vein thrombosis (DVT) (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/deep-vein-thrombosis-dvt-beyond-the-basics/print

  DEEP VEIN THROMBOSIS OVERVIEW […] Venous thrombosis is a condition in which a blood clot (thrombus) forms in a vein. This clot can limit blood flow through the vein, causing swelling and pain. Most commonly, venous thrombosis occurs in the „deep veins” in the legs, thighs, or pelvis. This is called a deep vein thrombosis, or DVT. […] […] If a person is found to have a DVT and there is no known medical condition or recent surgery, leg injury, or immobility that could have caused the DVT, it is possible that an inherited condition is the cause. This is especially true in people with a family member who has also experienced a DVT or pulmonary embolus (PE). In these cases, testing for an inherited thrombophilia (a genetic problem that causes the blood to form abnormal clots more easily than normal) may be recommended. […]

• #19 Patient education: Deep vein thrombosis (DVT) (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/deep-vein-thrombosis-dvt-beyond-the-basics/print

  Some medical conditions and medications increase your risk of developing a blood clot: […] Cancer. […] Immobilization (eg, due to hospitalization, recovery from injury, bedrest, or paralysis). […] Previous DVT or PE. […] Age ≥65 years. […] Obesity. […] Pregnancy. […] Certain medications (eg, birth control pills, hormone replacement therapy, tamoxifen, thalidomide, erythropoietin, cancer chemotherapy medications). The risk of a blood clot is further increased in people who use one of these medications and also have other risk factors. […] Smoking. […] Heart failure. […] Coronavirus disease 2019 (COVID-19) infection (associated with hospitalization). […] Kidney problems, such as nephrotic syndrome. […] […] Inherited thrombophilia refers to a genetic problem that causes the blood to form clots more easily than normal. Various factors in the blood clotting process may be involved, depending on the type of genetic problem present.

• #20 Patient education: Deep vein thrombosis (DVT) (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/deep-vein-thrombosis-dvt-beyond-the-basics/print

  People diagnosed with a venous thromboembolism are occasionally found to have an inherited thrombophilia. Examples of inherited thrombophilia include factor V Leiden, the prothrombin gene mutation, and deficiencies of naturally occurring blood thinning factors (antithrombin, protein C, and protein S). […] […] Some types of thrombophilia are not inherited but can still increase a person’s risk of developing a blood clot. Examples include: […] Certain disorders of the blood, such as polycythemia vera or essential thrombocytosis […] Antiphospholipid antibodies (antibodies in the blood that can affect the clotting process) […] Having an increased level of one or more factors involved in blood clotting.

• #21 Deep vein thrombosis risk factors, prevention, and more

  https://www.medicalnewstoday.com/articles/deep-vein-thrombosis-risk-factors

  The identified inherited clotting disorders that can increase the risk of DVT include: protein S deficiency, protein C deficiency, factor V Leiden mutation, prothrombin gene mutation, dysfibrinogenemia, hyperhomocysteinemia, antithrombin deficiency, factor XII deficiency. […] Having a non-O blood group and a family history of DVT or pulmonary embolism increases the risk of DVT. […] Deep vein thrombosis (DVT) has several potential risk factors. They include injury to veins, chronic health conditions, infections, surgery, and trauma. Other factors that may increase the likelihood of developing DVT include hormone changes, obesity, smoking, and being over the age of 40 years.

• #22 Deep Venous Thrombosis (DVT): Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1911303-overview

  The presence of risk factors plays a prominent role in assessing the pretest probability of DVT. Furthermore, transient risk factors permit successful short-term anticoagulation, whereas idiopathic DVT or chronic or persistent risk factors warrant long-term therapy. […] Genetic mutations within the coagulation cascade represent those at highest risk for the development of venous thrombosis. Genetic thrombophilia is identified in 30% of patients with idiopathic venous thrombosis. […] Other diseases and states can induce hypercoagulability in patients without other underlying risks for DVT. They can predispose patients to DVT, though their ability to cause DVT without intrinsic hypercoagulability is in question. […] Risk factors include: Age, Immobilization longer than 3 days, Pregnancy and the postpartum period, Major surgery in previous 4 weeks, Long plane or car trips (4 hours) in previous 4 weeks, Cancer, Previous DVT, Stroke, Acute myocardial infarction, Congestive heart failure, Sepsis, Nephrotic syndrome, Ulcerative colitis, Multiple trauma, Central nervous system/spinal cord injury, Burns, Lower extremity fractures, Systemic lupus erythematosus and the lupus anticoagulant, Behet syndrome, Homocystinuria, Polycythemia rubra vera, Thrombocytosis, Inherited disorders of coagulation/fibrinolysis, Antithrombin III deficiency, Protein C deficiency, Protein S deficiency, Prothrombin 20210A mutation, Factor V Leiden, Dysfibrinogenemia and disorders of plasminogen activation, IV drug abuse, Oral contraceptives, Estrogens, Heparin-induced thrombocytopenia (HIT), COVID-19.

• #23 Causes of Deep Vein Thrombosis (DVT) – Oxford Medical Education

  https://oxfordmedicaleducation.com/haematology/causes-deep-vein-thrombosis-dvt/

  Causes of DVT affect one or more of the 3 components of Virchows triad (Stasis, hypercoagulable states and injury): […] Stasis of blood […] Immobility […] Proximal compression of veins […] Hypercoagulable state […] Acquired […] Inflammation […] Following trauma or surgery […] Post-partum […] Malignancy […] Acute inflammatory (e.g. IBD) or infectious illness […] Organ dysfunction […] Liver disease […] Renal failure […] Nephrotic syndrome […] Haematological […] Anti-phospholipid syndrome […] Hyperviscosity due to leukocytosis (100), or high levels of IgM or IgA paraprotein […] Myeloproliferative disorders (polycythaemia rubra vera, essential thrombocythaemia, myelofibrosis) […] Paroxysmal nocturnal haemoglobinuria […] ITP and heparin-induced thrombocytopenia (HIT)

• #24 Causes of Deep Vein Thrombosis (DVT) – Oxford Medical Education

  https://oxfordmedicaleducation.com/haematology/causes-deep-vein-thrombosis-dvt/

  Drugs […] Oral contraceptives and hormone replacement therapy […] Glucocorticoids […] Thalidomide and its derivatives […] Congenital […] Antithrombin deficiency […] Protein C and Protein S deficiency […] Prothrombin G20210A […] Factor V Leiden (activated protein C resistance) […] Note much inherited risk is due to numerous unidentified polymorphisms in other genes […] Endothelial injury […] Recreational intravenous drug use […] Iatrogenic central venous catheters […] Surgery […] Other […] Obesity […] Not clearly in any part of Vichows triad, but may be related to both inflammation and statis.

• #25 Deep Vein Thrombosis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK507708/

  Obesity, pregnancy, the advanced age of older than 60, surgery, critical care admission, dehydration, and cancer are the established causalities of DVT and VTE. […] Potential risk factors of deep vein thrombosis might be categorized according to the transient, persistent, or unprovoked criteria. […] However, active cancers and specific medical conditions that increase the risk of venous thromboembolism are categorized as persistent risk factors. […] Any further etiological risk factors not categorized among either transient or persistent subgroups should be labeled as unprovoked VTE.

• #26 Deep Venous Thrombosis (DVT) – Cardiovascular Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/cardiovascular-disorders/peripheral-venous-disorders/deep-venous-thrombosis-dvt

  Without adequate treatment, lower extremity DVT has a 3% risk of fatal PE; death due to upper extremity DVT is very rare. Risk of recurrent DVT is lowest for patients with transient risk factors and greatest for patients with persistent risk factors, idiopathic DVT, or incomplete resolution of past DVT.

• #27 Deep vein thrombosis | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/deep-vein-thrombosis

  Deep vein thrombosis (DVT) is where a blood clot forms in the deep veins of the leg (veins below the skins surface that are not visible through the skin). […] Anything that slows the flow of blood through the deep veins in the legs can cause DVT. This includes an injury, surgery or long periods of sitting or lying. […] DVT is more likely to happen if you: have coronary heart disease, are over 40, have obesity, smoke tobacco, have had DVT before or have a family history of blood clots or stroke at a young age, take the contraceptive pill or hormone replacement therapy, have cancer or heart failure, have varicose veins, have a blood clotting disorder. […] There are also some temporary situations that can increase the risk of DVT. These include if you: have had major surgery, have had an injury (fractures, spinal cord injuries, muscle injuries), are confined to bed or have limited movement, go on a long journey (more than four hours) by plane, car or train, are pregnant or if you’ve had a baby in the previous six weeks, are dehydrated, have an infection.

• #28 Deep vein thrombosis | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/deep-vein-thrombosis

  Sometimes DVT can happen for no obvious reason. […] If DVT isn’t treated, it can cause complications, including inflammation of the vein (phlebitis), leg ulcers and pulmonary embolism. […] The use of anticoagulant medicines to prevent clots forming in the first place are recommended in people considered to be at moderate to high risk of DVT.

• #29 Deep Vein Thrombosis, DVT – Symptoms, Causes and Complications PACE Hospitals – Best Hospitals in Hitech City, Hyderabad, India | Near Madhapur, Kukatpally, KPHB, Kondapur, Gachibowli, Jubilee Hills, Banjara HillsPACE Hospitals Contact Nu

  https://www.pacehospital.com/deep-vein-thrombosis-dvt-symptoms-causes-types-complications-and-prevention

  Deep vein thrombosis (DVT) is caused by the prevention or blockage of blood flow in veins due to any of the following risk factors mentioned below, but not limited to: […] DVT (Deep Vein Thrombosis) risk factors are classified as follows: […] General risk factors […] Increased venous blood pressure due to mechanical compression and functional impairment because of Stenosis (narrowing or constriction of the passage), Congenital anomaly (abnormal foetal changes) or Neoplasm (abnormal growth of the tissue) or Pregnancy […] Risk factors associated with coagulation […] Genetic deficiencies due to Anticoagulation proteins C and S (glycoproteins responsible for clotting), Deficiency of Antithrombin III (clotting factor) or Factor V Leiden mutation (clotting factor) […] Acquired risks due to Vasculitis (inflammation of blood vessels), Systemic lupus erythematosus (autoimmune inflammatory disease), Altered lupus anticoagulant (immunoglobulins), Inflammatory bowel disease (digestive tract inflammation), Nephrotic syndrome (too much protein excreted by the kidney), Cancer, Sepsis (life-threatening infection), Myocardial infarction (heart attack), Heart failure, Hypertension, Diabetes, Burns, Oral oestrogens, Smoking

• #30 Deep Vein Thrombosis, DVT – Symptoms, Causes and Complications PACE Hospitals – Best Hospitals in Hitech City, Hyderabad, India | Near Madhapur, Kukatpally, KPHB, Kondapur, Gachibowli, Jubilee Hills, Banjara HillsPACE Hospitals Contact Nu

  https://www.pacehospital.com/deep-vein-thrombosis-dvt-symptoms-causes-types-complications-and-prevention

  Constitutional risk factors: Surgery, Critical care admission, Dehydration, Cancer, Obesity, Pregnancy, Age greater than 60 […] Potential risk factors: Surgery with general anaesthetics, Hospitalisation, Caesarean section (birth procedure of baby through womb), Hormone replacement therapy, Pregnancy and peripartum period (shortly before or during, or immediately after the birth), Lower extremity injury with limited mobility for more than 72 hours.

• #31 What is Venous Thromboembolism? | American Heart Association

  https://www.heart.org/en/health-topics/venous-thromboembolism/what-is-venous-thromboembolism-vte

  Deep vein thrombosis (a blood clot) forms in the legs when something slows or changes the flow of blood. The most common triggers for VTE are surgery, injury, cancer, immobilization and hospitalization. […] In women, pregnancy and the use of hormones, such as oral contraceptives or estrogen for menopause symptoms, can also play a role. […] Certain factors increase risk for clotting: Age (risk increases as age increases), Obesity, Cancer, History of blood clots, Other chronic medical conditions, such as congestive heart failure, kidney disease, lung disease or inflammatory bowel disease, Smoking, Recent surgery, fracture or injury involving lower leg or pelvis, Travel within four weeks, lasting more than four hours, Genetic causes of excessive blood clotting (This occurs when there is an inherited or acquired deficiency of certain proteins such as antithrombin III that affect blood clotting.)

• #32 Deep Vein Thrombosis (DVT)

  https://my.clevelandclinic.org/health/diseases/16911-deep-vein-thrombosis-dvt

  Deep vein thrombosis (DVT, also called venous thrombosis) occurs when a thrombus (blood clot) develops in veins deep in your body because your veins are injured or the blood flowing through them is too sluggish. […] These conditions can increase your risk of a deep vein thrombosis: Having an inherited (genetic) condition increases your risk of blood clots. […] More than half of all DVTs happen as a result of being in the hospital from a medical illness or following surgery. […] Not moving for long periods of time, like sitting for a long time on trips in a car, truck, bus, train or airplane or being immobile after surgery or a serious injury. […] Having a history of deep vein thrombosis in yourself or your family. […] Having cancer and some of its treatments (chemotherapy). […] Having limited blood flow in a deep vein because of an injury, surgery or immobilization. […] Being older than 40 (although a DVT can affect people of any age). […] Having overweight/obesity. […] Using tobacco products. […] Having varicose veins. […] Taking birth control pills or hormone therapy. […] Having COVID-19.

• #33 Venous Thromboembolism – Deep Vein Thrombosis (DVT) | NHLBI, NIH

  https://www.nhlbi.nih.gov/health/deep-vein-thrombosis

  DVT may occur if the flow of blood slows down in your bodys deep veins, if something damages the blood vessel lining, or if the makeup of the blood itself changes so that blood clots form more easily. […] Many factors can raise the likelihood of blood clotting in the deep veins of the legs. […] DVT can occur at any age, but the chances rise as you get older. […] Some genes you inherit may raise your likelihood of developing blood clots. […] DVT can develop during a long flight or when a person is on bed rest in a nursing home, hospital setting, or after surgery. […] A blood clotting disorder, immune illnesses such as lupus, heart problems, cancer, or serious illness such as getting infected with SARS-CoV-2, the virus that causes COVID-19, can raise the likelihood of DVT. […] Women in their childbearing years are more likely than men to develop blood clots. The chance is higher for pregnant women and women who take birth control pills or get hormone therapy. After menopause, womens risk is lower than mens.

• #34 Deep Vein Thrombosis (DVT): Symptoms, Causes, and More

  https://www.healthline.com/health/deep-venous-thrombosis

  Certain medications: Some medications increase the chances your blood will form a clot. These include birth control pills, hormone therapy drugs, glucocorticoids, and antidepressants. […] Age: DVT can still happen at any age, but the incidence rises in older ages. Only 1 in 10,000 people younger than age 20 get DVT, but among those older than age 80, it is 1 in 100. […] Trauma: Having an injury that damages your veins, like a bone fracture, can cause a blood clot to develop. […] Obesity: Being overweight can put more pressure on your legs and pelvis veins. […] Pregnancy: Pregnancy increases the risk of DVT. In fact, pregnant people are 5-10 times more likely to develop DVT than those who aren’t pregnant. […] Family history: Having relatives who have had DVT may make you more likely to get it.

• #35 Deep Vein Thrombosis (DVT): Causes, Symptoms, and Treatment

  https://patient.info/allergies-blood-immune/deep-vein-thrombosis-leaflet

  A deep vein thrombosis (DVT) is a blood clot in a vein. Blood clots in veins most often occur in the legs but can occur elsewhere in the body, including the arms. […] The most common cause of a blood clot developing in a vein is immobility. […] A surgical operation where you are asleep (under general anaesthetic) is the most common cause of a DVT. […] Any illness or injury that causes immobility increases the risk of DVT. […] Long journeys by plane, train or coach/car may cause a slightly increased risk. […] Damage to the inside lining of the vein increases the risk of a blood clot forming. […] Conditions that cause the blood to clot more easily than normal (thrombophilia) can increase the risk. […] Contraceptive pills, patches and rings and hormone replacement therapy (HRT) which contain oestrogen can cause the blood to clot slightly more easily.

• #36 Deep Venous Thrombosis (DVT) – Cardiovascular Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/cardiovascular-disorders/peripheral-venous-disorders/deep-venous-thrombosis-dvt

  Deep venous thrombosis (DVT) results from conditions that impair venous return, lead to endothelial injury or dysfunction, or cause hypercoagulability. […] Many factors can contribute to DVT. Cancer is a risk factor for DVT, particularly in older patients and in patients with recurrent thrombosis. The association is strongest for lung, ovarian, gastric, brain or pancreatic cancers where 10 to 15% of patients can develop VTE. […] Lower extremity DVT most often results from impaired venous return (eg, in immobilized patients), endothelial injury or dysfunction (eg, after leg fractures), and hypercoagulability. […] Upper extremity DVT most often results from endothelial injury due to central venous catheters, pacemakers, or injection drug use. […] Common complications of DVT include chronic venous insufficiency, post-thrombotic syndrome, and pulmonary embolism.

• #37 DVT: Causes, Warning Signs, Treatment, and Prevention of Deep Vein Thrombosis

  https://www.webmd.com/dvt/what-is-dvt-and-what-causes-it

  If blood moves too slowly through your veins, it can cause a clump of blood cells called a clot. […] The causes of DVT include things that keep blood from: […] This usually happens as a result of damage to one of your veins due to: […] Many things can raise your chances of getting DVT. […] DVT can happen at any age, but your risk is greater after age 40. […] When you sit for long stretches of time, the muscles in your lower legs stay still. […] When you’re in the hospital for a long time, this can also keep your muscles still and raise your odds of DVT. […] Carrying a baby puts more pressure on the veins in your legs and pelvis. […] People with obesity that’s a body mass index (BMI) of 30 or higher are at a higher risk. […] Conditions like inflammatory bowel disease, cancer, and heart disease can all raise your risk.

• #38 Understanding The Dangers of Deep Vein Thrombosis (DVT) (February 2024) | El Camino Health

  https://www.elcaminohealth.org/stay-healthy/blog/understanding-dangers-deep-vein-thrombosis-dvt

  DVT occurs when a thrombus (blood clot) develops in a vein deep in your body. The clot forms as a result of sluggish blood flow due to damaged or unhealthy veins and/or a long immobilization (such as a long plane ride). […] DVT is caused by damage to a vein from surgery, inflammation, infection, or injury. Lack of movement, such as sitting for a long time while driving or flying, long-term bedrest, or paralysis is an important contributing factor because muscle contractions from walking and moving the legs stimulate blood flow. Certain factors increase the risk of developing DVT, such as: […] Being 60 or older (although DVT can occur at any age) […] Pregnancy, which increases the pressure in the veins in the pelvis and legs […] Inherited clotting disorders […] The use of oral contraceptives or hormone replacement therapy, both of which increase the blood’s ability to clot

• #39 Understanding The Dangers of Deep Vein Thrombosis (DVT) (February 2024) | El Camino Health

  https://www.elcaminohealth.org/stay-healthy/blog/understanding-dangers-deep-vein-thrombosis-dvt

  Excess weight, which puts more pressure on the veins in the pelvis and legs […] Smoking cigarettes, which can impact blood flow and clotting […] Cancer certain cancers alter blood chemistry which can increase clotting […] Heart failure […] Crohn’s disease, ulcerative colitis, lupus, vasculitis, or irritable bowel syndrome (IBS) […] A personal or family history of DVT or pulmonary embolism […] A broken hip or leg […] A recent hip or knee replacement […] A pacemaker or central venous catheter […] Varicose veins […] COVID-19.

• #40 Understanding the Causes and Treatments of DVT

  https://www.centerforvein.com/blog/understanding-the-causes-and-treatments-of-dvts

  Deep vein thrombosis (DVT) occurs when a blood clot (thrombus) forms in a vein deep to the muscle, causing circulation to be partially or completely blocked. […] There are many possible causes for blood clots, says Dr. Kelsey. These include: […] Inherited genetic defects that cause problems with bleeding and clotting, especially when combined with an additional provoking trigger (such as having surgery or starting birth control pills) can cause a DVT. […] According to Dr. Kelsey, if some prevention isn’t used, hip surgery carries up to a 60 percent risk of a blood clot, knee surgery about 40 percent risk, and abdominal surgery about 15-20 percent chance. […] The risk of clots increases with age, although clots can occur at any age. […] Some forms of cancer can first appear as a blood clot, such as pancreatic or ovarian cancer, explains Dr. Kelsey.

• #41 Deep Venous Thrombosis (DVT) – Cardiovascular Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/cardiovascular-disorders/peripheral-venous-disorders/deep-venous-thrombosis-dvt

  Without adequate treatment, lower extremity DVT has a 3% risk of fatal PE; death due to upper extremity DVT is very rare. Risk of recurrent DVT is lowest for patients with transient risk factors and greatest for patients with persistent risk factors, idiopathic DVT, or incomplete resolution of past DVT.

• #42 DVT (deep vein thrombosis)

  https://www.nhs.uk/conditions/deep-vein-thrombosis-dvt/

  DVT (deep vein thrombosis) is a blood clot in a vein, usually in the leg. […] A DVT (deep vein thrombosis) is more likely to happen if you: […] Sometimes DVT can happen for no obvious reason.

• #43 Symptoms and Causes of Deep Vein Thrombosis (DVT)

  https://thewhiteleyclinic.co.uk/conditions/deep-vein-thrombosis/symptoms-causes/

  The commonest cause of blood composition changes is dehydration. […] Females taking oestrogen either in the form of the oral contraceptive pill or as HRT, are also changing the blood composition in a way that makes thrombosis more likely. […] Over the last few years, it has become increasingly well understood that deep vein thrombosis (DVT) can be the first sign of an underlying cancer, particularly in people over 40 years old. […] The reason for this is not fully understood but it is likely that certain cancers, particularly of the bowel, breast, lung or pancreas secrete certain substances into the blood that increase the risk of DVT. […] As such, anyone who is found to have a DVT for no good reason (a so-called ‘unprovoked’ DVT) should undergo full physical examination and tests to look for these common cancers.

• #44 Deep Venous Thrombosis (DVT) – Cardiovascular Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/cardiovascular-disorders/peripheral-venous-disorders/deep-venous-thrombosis-dvt

  Deep venous thrombosis (DVT) results from conditions that impair venous return, lead to endothelial injury or dysfunction, or cause hypercoagulability. […] Many factors can contribute to DVT. Cancer is a risk factor for DVT, particularly in older patients and in patients with recurrent thrombosis. The association is strongest for lung, ovarian, gastric, brain or pancreatic cancers where 10 to 15% of patients can develop VTE. […] Lower extremity DVT most often results from impaired venous return (eg, in immobilized patients), endothelial injury or dysfunction (eg, after leg fractures), and hypercoagulability. […] Upper extremity DVT most often results from endothelial injury due to central venous catheters, pacemakers, or injection drug use. […] Common complications of DVT include chronic venous insufficiency, post-thrombotic syndrome, and pulmonary embolism.

• #45 About Venous Thromboembolism (Blood Clots) | Venous Thromboembolism (Blood Clots) | CDC

  https://www.cdc.gov/blood-clots/about/index.html

  DVT occurs when a blood clot develops in the deep veins, most commonly in the legs. […] Factors that increase the risk of developing DVT/PE include those associated with an injury to a vein. […] Slow blood flow caused by limited movement. […] Certain chronic medical illnesses, older age, family history, and other health factors. […] Increased levels of estrogen, a hormone that plays a key role in a female’s reproductive health. […] The most serious complication of DVT happens when a part of the clot breaks off and travels through the bloodstream to the lungs, causing a blockage called PE. […] For some people, DVT and PE can become a chronic illness; about 30% of people who have had a DVT or PE are at risk for another episode.

• #46 Deep Venous Thrombosis (DVT) – Cardiovascular Disorders – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/cardiovascular-disorders/peripheral-venous-disorders/deep-venous-thrombosis-dvt

  Without adequate treatment, lower extremity DVT has a 3% risk of fatal PE; death due to upper extremity DVT is very rare. Risk of recurrent DVT is lowest for patients with transient risk factors and greatest for patients with persistent risk factors, idiopathic DVT, or incomplete resolution of past DVT.

• #47 Deep vein thrombosis – Wikipedia

  https://en.wikipedia.org/wiki/Deep_vein_thrombosis

  Deep vein thrombosis (DVT) is a type of venous thrombosis involving the formation of a blood clot in a deep vein, most commonly in the legs or pelvis. The mechanism behind DVT formation typically involves some combination of decreased blood flow, increased tendency to clot, changes to the blood vessel wall, and inflammation. Risk factors include recent surgery, older age, active cancer, obesity, infection, inflammatory diseases, antiphospholipid syndrome, personal history and family history of VTE, trauma, injuries, lack of movement, hormonal birth control, pregnancy, and the period following birth. VTE has a strong genetic component, accounting for approximately 50 to 60% of the variability in VTE rates. Genetic factors include non-O blood type, deficiencies of antithrombin, protein C, and protein S and the mutations of factor V Leiden and prothrombin G20210A. In total, dozens of genetic risk factors have been identified.

• #48 Deep vein thrombosis – Wikipedia

  https://en.wikipedia.org/wiki/Deep_vein_thrombosis

  Traditionally, the three factors of Virchow’s triad—venous stasis, hypercoagulability, and changes in the endothelial blood vessel lining—contribute to VTE and were used to explain its formation. More recently, inflammation has been identified as playing a clear causal role. Other related causes include activation of immune system components, the state of microparticles in the blood, the concentration of oxygen, and possible platelet activation. Various risk factors contribute to VTE, including genetic and environmental factors, though many with multiple risk factors never develop it. […] Acquired risk factors include the strong risk factor of older age, which alters blood composition to favor clotting. Previous VTE, particularly unprovoked VTE, is a strong risk factor. A leftover clot from a prior DVT increases the risk of a subsequent DVT. Major surgery and trauma increase risk because of tissue factor from outside the vascular system entering the blood. Infections, including sepsis, COVID-19, HIV, and active tuberculosis, increase risk. Chronic inflammatory diseases and some autoimmune diseases, such as inflammatory bowel disease, systemic sclerosis, Behçet’s syndrome, primary antiphospholipid syndrome, and systemic lupus erythematosus (SLE) increase risk. Cancer can grow in and around veins, causing venous stasis, and can also stimulate increased levels of tissue factor.

• #49 Deep Venous Thrombosis (DVT): Practice Essentials, Background, Anatomy

  https://emedicine.medscape.com/article/1911303-overview

  The presence of risk factors plays a prominent role in assessing the pretest probability of DVT. Furthermore, transient risk factors permit successful short-term anticoagulation, whereas idiopathic DVT or chronic or persistent risk factors warrant long-term therapy. […] Genetic mutations within the coagulation cascade represent those at highest risk for the development of venous thrombosis. Genetic thrombophilia is identified in 30% of patients with idiopathic venous thrombosis. […] Other diseases and states can induce hypercoagulability in patients without other underlying risks for DVT. They can predispose patients to DVT, though their ability to cause DVT without intrinsic hypercoagulability is in question. […] Risk factors include: Age, Immobilization longer than 3 days, Pregnancy and the postpartum period, Major surgery in previous 4 weeks, Long plane or car trips (4 hours) in previous 4 weeks, Cancer, Previous DVT, Stroke, Acute myocardial infarction, Congestive heart failure, Sepsis, Nephrotic syndrome, Ulcerative colitis, Multiple trauma, Central nervous system/spinal cord injury, Burns, Lower extremity fractures, Systemic lupus erythematosus and the lupus anticoagulant, Behet syndrome, Homocystinuria, Polycythemia rubra vera, Thrombocytosis, Inherited disorders of coagulation/fibrinolysis, Antithrombin III deficiency, Protein C deficiency, Protein S deficiency, Prothrombin 20210A mutation, Factor V Leiden, Dysfibrinogenemia and disorders of plasminogen activation, IV drug abuse, Oral contraceptives, Estrogens, Heparin-induced thrombocytopenia (HIT), COVID-19.

• #50 Understanding Deep Vein Thrombosis | Vascular Institute of Chattanooga

  https://vascularinstituteofchattanooga.com/2023/09/14/understanding-deep-vein-thrombosis-causes-risk-factors-and-treatment-options/

  While DVT can be a life-threatening condition, it is preventable and treatable. Understanding the risk factors and making lifestyle changes can significantly reduce the likelihood of developing a clot. If you suspect, you may have DVT, seeking medical attention immediately can increase the probability of survival.

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