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Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_3656_Библиотеки_им_академика_М_И_Перельмана

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100 Acute and chronic venous thrombosis
https://t.me/med1917
while forming a microbial containment barrier,
116,117
and it has also been reported in the vasculature during sep­sis and in inammatory non-infectious disease states, such as small-vessel vasculitis.
118,119
It has recently been shown that extracellular DNA contributes to thrombo­sis in experimental animal models.
120
In addition to their phagocytic and bactericidal functions, neutrophils and other leukocytes are known to release DNA bers to form extracellular traps,
121–124
and neutrophils are one of the main inammatory cells that participate in acute VT.20 In thrombi obtained from experimental VT in baboons and mice, of the thrombi, and co-localize with VWF.
126,127
extracellular traps are a structural part
120
Based on
125
these studies, extracellular DNA has recently been stud­ied as a potential biomarker of VT. e results of this study showed a signicant increase in circulating extra­cellular DNA in VT-positive patients compared to healthy and VT-negative controls.
128
Extracellular DNA linked to VT is one of the most promising discoveries in thrombo­genesis, and we believe this will lead to a new era in VT research.
8.6.2.1 GALECTINS AND VT
Galectin 3 (gal3) and gal3 binding protein (gal3 bp) play important roles in a number of pathologies, such as cancer, infections, diabetes, atherosclerosis, wound healing, and in inammatory disorders such as asthma and rheumatoid arthritis, but their role in VT has not been dened.
129 –137
gal3 bp was found to be upregulated in microparticles col­lected from human patients diagnosed with deep VT.
138
gal3 bp is a member of the lectin family and is associated with integrin-mediated cell adhesion.
139
Recently, a detailed review of galectins and their potential role in venous throm­bogenesis, inammation, and brosis was published.78 e results of these studies provide evidence that microparticles
are associated with VT; however, their role in thrombogen­esis and also their potential role as biomarkers of VT were recently studied.
140
Our laboratory recently discovered that gal3 and gal3 bp are associated with murine thrombogen­esis and co-localization, and that thrombogenesis is in part gal3 dependent. We also showed that gal3 could be a poten­tial biomarker in patients with acute VT.
140
gal3 bp and gal3 were found in all tissue and blood elements pertinent to the thrombi that were examined (microparticles, red blood cells, platelets, vein wall, and thrombus), with the exception of leukocytes. In addition, increased levels of gal3 bp and gal3 were observed during VT conditions in both mice and humans in our recent work, showing parallelism between these two species. However, despite the fact that the con­centration levels of gal3 bp exceeded gal3 levels, our data showed that the increased levels of gal3 were higher in VT compared to the non-VT condition. Biomarkers of VT are being intensively explored due to the absence of any that are capable at present of ruling in VT, and herein we present two clear biomarker candidates to be evaluated in future studies.
140
8.7 CONCLUSION
It is an exciting time to study venous thrombogenesis and the pathophysiology of the resulting vein wall damage, in part because it has been relatively neglected compared with arterial disease. Fortunately, the National Institutes of Health has put forth two requests for funding applications in the last several years to better study the clinical and basic pathobiology of venous disease, and the Surgeon General has approved a call to action against VTE. Adjuncts to or replacement therapies for anticoagulants hold tremendous promise, and will hopefully decrease the early risk of PE and the late complications of PTS for the benet of the patient.
Guidelines 1.7.0 of the American Venous Forum on Acute and Chronic Venous Thrombosis: Pathogenesis and New Insights
No. Guideline
1.7.1 Acute venous thrombosis causes an acute to chronic inflammatory responsein both the vein wall and the thrombus. This leads to thrombus amplification, organization, and recanalization and damage to the vein wall and the valves
1.7.2 D-dimer, endothelium, platelet derived microparticles and soluble P-selectin are markers of thrombosis and they are increased in patients with acute venous thromboembolism.
1.7.3 Resolution of the thrombus is modulated by natural anticoagulants such as antithrombin III, protein C and S, and thrombin.
1.7.4 Polymorphonuclear cells promote both fibrinolysis and collagenolysis and they play key role in thrombus resolution. Monocytes are essential in late thrombus resolution.
Grade of evidence
(A: high quality;
B:moderate quality;
C:low or very low quality)
A
A
B
A
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123. von Kockritz-Blickwede M, Goldmann O, ThulinP etal. Phagocytosis-independent antimicrobial activity of mast cells by means of extracellular trap formation. Blood 20 0 8;111(6):3070 – 80.
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125. Fuchs TA, Brill A, Duerschmied D etal. Extracellular DNA traps promote thrombosis. Proc Natl Acad Sci U S A 2010;107(36):158 80 – 5.
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Epidemiology and risk factors of acute
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venousthrombosis
MARK H. MEISSNER
9
9.1 Introduction 107
9.2 The epidemiology of lower extremity DVT 107
9.3 Risk factors for DVT 109
9.1 INTRODUCTION
Deep venous thrombosis (DVT) and pulmonary embo­lism (PE) share many risk factors and pathophysiological features and are usually considered manifestations of the same disease: venous thromboembolism (VTE). A total of 25%–40% of patients with DVT have asymptomatic PE. VTE is the third most common cardiovascular disorder in Western populations, following only myocardial infarction and stroke.
e incidence of DVT is approximately twice that of PE,2 so that among patients presenting with VTE, approxi­mately a third manifest PE while two-thirds manifest DVT. e deep veins of the lower extremity are most commonly involved, although with more frequent instrumentation and improved diagnostic tests, thrombosis of the upper extrem­ity veins is increasingly being recognized. rombosis only rarely involves unusual sites such as the cerebral sinuses, retina, and mesenteric veins. e prevention and manage­ment of VTE requires some understanding of its epidemiol­ogy and associated risk factors, particularly in recognizing populations warranting prophylaxis, counseling patients regarding high-risk situations such as pregnancy, contra­ception, and hormone-replacement therapy, and determin­ing the duration of anticoagulation required to minimize recurrent thrombosis.
3
1,2
9.2 THE EPIDEMIOLOGY OF LOWER
EXTREMITY DVT
e incidence of lower extremity DVT is highly depen­dent on the population studied, their underlying risk fac­tors, and the means by which DVT is documented. Autopsy studies are biased by the inclusion of the very sick and very
9.4 Conclusions 115 References 115
old, while clinical trials are oen directed towards spe­cic inpatient groups, such as post-operative patients. True estimates of the incidence of DVT are limited by the few population-based studies, the clinically silent nature of most thromboses, and the need for objective documenta­tion of the diagnosis. Even the interpretation of method­ologically sound studies is complicated by the inconsistent inclusion of DVT and/or PE, diering exclusion or inclu­sion of recurrent DVT, and variable age ranges. It is gener­ally believed that incidence rates from autopsy studies are overestimates, while those from epidemiological studies are underestimates.
Although likely an underestimate due to the outpatient treatment of VTE, recent estimates suggest an average of 547,596 hospitalizations with a diagnosis of VTE per year in the United States.5 A systematic review of nine methodolog­ically sound epidemiological studies suggests a weighted mean age-adjusted incidence of a rst episode of DVT alone of 50.4 per 100,000 person-years.6 Considering both DVT and PE, the age- and sex-adjusted incidence of rst-time symptomatic VTE (DVT + PE) in the United States is esti- mated to be between 71 and 117 cases per 100,000 popu­lation.4 A substantial increase in the incidence of VTE has been noted since 2001, largely due to an increased incidence of PE but not DVT.7 Among people of European descent, more recent reviews report an incidence of 104–183 per 100,000 for VTE, 45–117 per 100,000 for isolated DVT, and 29–78 per 100,000 for PE alone.7 It has been suggested that the rising incidence of PE is related to the increased avail­ability and diagnostic accuracy of computed tomography pulmonary angiography and magnetic resonance imaging. Despite this observation, the age-adjusted PE mortality rate in France has been noted to decline by 3% per year between 2000 and 2010.
4
8
107
108 Epidemiology and risk factors of acute venousthrombosis
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DVT is a multi-causal disease resulting from the interac­tion of genetic and environmental risk factors. rombosis occurring in the absence of recognized thrombotic risk fac­tors is designated primary, idiopathic, or unprovoked DVT, while that developing in their presence is designated sec­ondary or provoked DVT. e proportion of patients with idiopathic DVT ranges between 26% and 49%.
1,3, 4,9,10
Risk factors for secondary or provoked DVT may be either tran­sient or permanent and may be either genetic or acquired (environmental). Permanent risk factors may be considered to be those that raise an individual’s baseline thrombotic potential, while transient risk factors are oen those that trigger an acute thrombotic event. Temporary, reversible risk factors are present in 42.4% of patients, most com­monly immobility (15%), surgery (14.4%), and severe medi­cal illness (8.2%).
10
Most risk factors for DVT can be related to the compo­nents of Virchow’s triad—stasis, abnormalities of the vessel wall, and abnormalities of blood—and many are associated with some component of hypercoagulability on a genetic, acquired, or situational basis (Table 9.1). Well-established risk factors for thrombosis are shown in Table 9.2.
11–27
ere are substantial dierences between the risk factors associ­ated with inpatient and outpatient DVT. Although malig­nancy, surgery, and trauma within the previous 3 months remain signicant risk factors for outpatient thrombo­sis, the frequencies of surgery and malignancy are higher among inpatients with DVT.
28,29
Furthermore, although usually considered to be manifestations of the same dis­ease, some of these factors do appear to have a dieren­tial eect on the risk of DVT and PE.2 Black ethnicity and some inammatory pulmonary diseases (chronic obstruc­tive pulmonary disease, sickle cell trait, and pneumonia) appear to be stronger risk factors for PE, while minor leg injuries, obesity, reproductive factors (oral contraceptives [OCs] and pregnancy) and the factor V Leiden mutation are stronger risk factors for DVT.2 Many of the risk factors more strongly associated with DVT arise from activated protein
C resistance, and it has been postulated that this may be due to associated impaired brinolysis and decreased embolic risk in these patients.
e degree of risk associated with each of these factors has been established to a variable extent (Table 9.2), but the importance of any individual factor is a function of both its relative risk in comparison to normal controls and its prevalence in the population. For example, although de­ciencies of the natural anticoagulants (antithrombin, pro­tein C, and protein S) are associated with an approximately 10-fold increased risk of thrombosis, they are rare defects. In contrast, the factor V Leiden mutation is associated with a much lower relative risk, but with a prevalence of 5% in Caucasians, it is far more important from a population­based perspective.
Perhaps most importantly, the development of clinically manifest thrombosis usually occurs with the convergence of multiple genetic and acquired risk factors. e simultane­ous presence of multiple risk factors is in fact oen a prereq­uisite for thrombosis. In symptomatic outpatients, the odds ratio for an objectively documented DVT increases from
1.26 for one risk factor to 3.88 for three or more risk fac­tors.28 However, many gene–gene and gene–environment interactions are synergistic, dramatically increasing risk above the sum of individual risk factors.17 For example, air travel in a patient with factor V Leiden and high factor VIII levels increases thrombotic risk by approximately 50-fold.
30
Finally, it is clear that VTE is the acute manifestation of a chronic disease. Approximately 30% of patients will sustain a recurrent event within 10 years of a rst episode of VTE.7 Although the 10-year risk of recurrence is as high as 50% in patients with idiopathic DVT, even among those with secondary VTE it may be as high as 22.5%.31 Risk factors for recurrence include unprovoked DVT, throm­bophilia, age, obesity, male gender, active cancer, and neurological diseases associated with lower extremity pare-
7,3 1
sis.
Persistently elevated D-dimer levels, as an indicator
of ongoing activation of coagulation, are also predictive
Table 9.1 Congenital, acquired, and situational thrombophilias
Congenital Acquired Situational Congenital or acquired
Factor V Leiden Age Surgery Hyperhomocysteinemia Prothrombin G20210A Malignancy Trauma Factor VIII, IX, and XI excess AT deficiency Antiphospholipid antibodies Pregnancy Protein C deficiency HIV infection Oral contraceptives Protein S deficiency Polycythemia vera Hormone-replacement therapy Elevated plasma factor VIII Paroxysmal nocturnal
Elevated plasma factor XI Heparin-induced
Non-type O blood Behcet disease
Note: AT, antithrombin.
hemoglobinuria
thrombocytopenia
Nephrotic syndrome Inflammatory bowel disease Hyperthyroidism
9.3 Risk factors for DVT 109
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Table 9.2 Thromboembolic risk factors
Risk factor Prevalence
Age 1.9× per 10-year increase 11 Surgery 18%–39% 4–5.9× (general surgery: 25%; retropubic
Trauma 3%–12% 20.5× 14 Malignancy 18%–51% Without chemotherapy: 4.4–6.9×
Hospital/nursing home 18.4× 14 History of venous thromboembolism 15.6× 16 Primary hypercoagulable states
AT, protein C&S deficiency 5.5%–9.5% 10× Factor V Leiden 20%
Heterozygous 3–8× 2,13,15,17,18 Homozygous 50–80×
Prothrombin 20210A 4%–7% 2–4×
Increased factor VIII 25% 6× Increased factor IX Increased factor XI Hyperhomocysteinemia Non-O blood type
Family history 2.9× 19 Oral contraceptives 16%
Estrogen replacement 2–4× 21 Immobilization 10%–17% 2× (pre-operative) to 5.6× (medical patients) 16,22 Long-distance travel 13.3% 2.4–4× 13,16,23,24 Pregnancy and puerperium 25%–30% Central venous catheter 11.8× 14 Antiphospholipid antibodies 3.1% Lupus anticoagulant: 6×
Inflammatory bowel disease 1.2%–7.1% 1.5–3.6× 2,27 Hyperthyroidism 2× 2 Obesity Variable Varicose veins Variable Myocardial Infarction/CHF 11% Variable
Note: AT, antithrombin; CHF, congestive heart failure.
a
Prevalence of risk factor among patients with deep venous thrombosis or venous thromboembolism (population-attributable risk).
b
Among women <45 years of age.
10% 2×
a
prostatectomy: 32%; gynecology (benign disease): 14%; neurosurgery: 22%; hip/ knee arthroplasty: 51%/47%)
With chemotherapy: 6.5–9.9×
2.2× 2–3×
1.6–2.3×
b
b
2.9× (30–50× with factor V Leiden)
4.3× 25
Anticardiolipin antibody: 2×
Risk References
12,13
14,15
20
26
of recurrence.32 ere is also a signicant relationship between the incident event—whether DVT or PE—and the type of recurrent event. ose with a PE as the index event are more likely to present with recurrent PE than those with primary DVT.
9.3 RISK FACTORS FOR DVT
9.3.1 Demographic risk factors
Age, gender, and race may inuence the incidence of DVT. Among these, age has been most consistently associated
with an increased risk of DVT. e incidence of DVT increases exponentially with age,
3
rising by a factor of 200 between 20 and 80 years of age, with a relative risk of 1.9 for each 10-year increment.11 Rosendaal33 similarly noted an incidence of 0.006 per 1000 children under 14years of age increasing to 0.7 among adults of 40–54 years of age, while
34
Hansson et al.
found the prevalence of objectively docu­mented thromboembolic events among men to increase from 0.5% at 50 years of age to 3.8% at 80 years of age. Several age-associated factors, including decreased mobil­ity, an increased number of major thrombotic risk factors, age-related hypercoagulability, and changes in the venous