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Head, Neck, and Abdominopelvic Septic Thrombophlebitis: Current Evidence and Challenges in Diagnosis and Treatment

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Head, Neck, and Abdominopelvic Septic Thrombophlebitis: Current Evidence and Challenges in Diagnosis and Treatment Review Article 301 Head, Neck, and Abdominopelvic Septic Thrombophlebitis: Current Evidence and Challenges in Diagnosis and Treatment Luca Valerio1 Nicoletta Riva2 1 Center for Thrombosis and Hemostasis, University Medical Center Address for correspondence Luca Valerio, MD, Center for Thrombosis Mainz, University of Mainz, Mainz, Germany and Hemostasis, University Medical Center Mainz, University of 2 Department of Pathology and Anatomy, Faculty of Medicine and Mainz, Mainz, 55116, Germany (e-mail: [email protected]). Surgery, University of Malta, Msida, Malta Hämostaseologie 2020;40:301–310. Abstract Septic thrombophlebitis (STP) is a complex, cross-disciplinary clinical condition that combines a localized infection with a neighboring venous thrombosis. STP can occur at several possible anatomic sites, such as dural sinuses, jugular vein (Lemierre syn- drome), portal vein (pylephlebitis), and pelvic veins. Its high mortality in the preanti- biotic era improved considerably with the introduction of modern antibiotics. However, little evidence exists to date to guide its clinical management. The incidence of STP or its risk factors may be increasing, and its mortality may still be considerable. These Keywords trends would have far-reaching implications, especially in the setting of increasing ► septic resistance to antimicrobial agents. No clinical assessment tools exist to support patient thrombophlebitis screening or guide treatment in STP. Few interventional studies exist on the efficacy ► venous and safety of anticoagulation. Recommendations on its indications, duration, and the thromboembolism agents of choice are mostly based on evidence derived from small observational ► Lemierre syndrome studies. While all forms of STP pose similar challenges, future research may benefit ► pylephlebitis from the distinction between bacteria-associated, virus-associated, and mycosis- ► bacterial infection associated thrombophlebitis. Addressing these gaps in evidence would enhance our ► anticoagulant ability to diagnose this condition and treat patients effectively. Introduction the thrombus; (3) bacteremia; or (4) suppuration or micro- organisms in the thrombus itself.1 Hence, the notion of STP.2 Septic thrombophlebitis (STP) can be defined as venous The bacteria themselves or the inflammation that they thrombosis resulting from local bacterial infection or colo- elicit acts on the Virchow triad’s component of vascular nization. This common pathogenesis encompasses a group of damage.3 Indeed, the other two components of the triad, fi clinical conditions with speci c anatomic localizations, risk hypercoagulability and venous stasis, often explain the This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited. factors, and prognoses. association of STP with specific sites and risk factors. The The idea that some venous thromboses have an infectious oldest example is pelvic thrombophlebitis: hypercoagulabil- origin originated from the observation that a thrombus may co- ity is provided by pregnancy/puerperium, stasis by the occur with local infection and inflammation. Historically, this dilation of the ovarian veins.4 pathogenesis was reflected in the anatomic-pathological dem- However, the term STP is often referred to two groups of onstration of (1) perivascular inflammation and (2) vein-wall conditions with overlapping but different etiology (►Fig. 1). suppuration (which, together, define phlebitis) contiguous to The first group includes thrombi resulting from vascular received © 2020 Georg Thieme Verlag KG DOI https://doi.org/ February 17, 2020 Stuttgart · New York 10.1055/a-1177-5127. accepted after revision ISSN 0720-9355. May 12, 2020 302 Head, Neck, and Abdominopelvic Septic Thrombophlebitis Valerio, Riva Fig. 1 Major risk factors and sites of septic thrombophlebitis. involvement in the context of a localized infection. Dural STP Epidemiology can involve the sagittal sinus, the lateral sinus, or the cavernous sinus, typically as a complication of meningitis, All STPs are rare. Estimates of their incidence in the general otitis media, or facial and sinusal infections, respectively. population amount to 1 to 2 per million population-years for Lemierre syndrome, a STP of the jugular vein, usually follows dural sinus STP6 and 1 per million population-years for an acute pharyngotonsillitis in children and young adults. Lemierre syndrome.7 Incidences are often produced for STP of the portal vein (pylephlebitis) is associated with specific age groups at risk: the yearly incidence of dural abdominal infections (diverticulitis, cholangitis, appendici- sinus STP is then estimated to be 13 to 16 cases per million tis). The second group of STP includes conditions associated adults,6 and that of Lemierre syndrome over 10 per million with septic colonization through a porte d’entrée—abreachof children and adolescents.7 Pelvic STP has been reported to anatomic continuity through which bacteria enter the vas- occur in 1:3,000 overall deliveries and 1:800 caesarean cular system even in the absence of an overt primary local deliveries.8 No reliable estimates of the incidence of pyle- infection. This mechanism explains all catheter-associated phlebitis exist; in a single-center retrospective study, it thrombophlebitis, including inferior vena cava thrombosis, complicated 0.6% of all intra-abdominal infections.9 and peripheral vein thrombophlebitis, often found in intra- venous drug users and burn patients. STP of the pelvic veins Pathophysiology can accompany either local infections or septic colonization following delivery or surgery. Both groups may evolve into Coagulation plays a defensive role during infections by sepsis, and the distinction between infection and coloniza- limiting the dissemination of pathogens and contributing 10 fl tion is not always clear-cut. Yet, it sets apart catheter- to their destruction. The systemic in ammatory response This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited. associated thrombophlebitis, which affects a relatively during sepsis includes the increased expression of procoa- well-defined patient population with specific implications gulant cytokines such as interleukin-1 (IL-1), IL-6, and for clinical management, and has been thus addressed by tumor necrosis factor-α,11 which also activate platelets.12 considerable research and long-standing international Locally, bacteria and viruses elicit a prothrombotic environ- guidelines.5 ment both indirectly, through endothelial damage and This article focuses on the forms of STP associated with local inflammation,13 and directly, by inducing the expression infection. While these conditions affect different patient pop- of tissue factor on monocytes and endothelial cells,14 acti- ulations, they are all treated in relatively similar ways and vating the intrinsic coagulation pathway,10 inhibiting the present the physician with the same management problems. physiologic anticoagulation mechanisms,15 and promoting Their common pathophysiology provides the rationale for a platelet aggregation,16 particularly via complement activa- unified view of all STPs as a single entity in clinical practice. We tion.17 Antiphospholipid antibodies generated during bac- will review available evidence and current challenges in the terial and viral infections18 may result in thrombotic epidemiology and management of STP associated with syndromes clinically indistinguishable from the classic head/neck, abdominal, and pelvic infections. antiphospholipid antibody syndrome.19 Gram-negative Hämostaseologie Vol. 40 No. 3/2020 Head, Neck, and AbdominopelvicSepticThrombophlebitis Valerio, Riva 303 bacteria may elicit the formation of antibodies that cross- subclinical cases. In contrast, increased imaging specificity react with platelet factor 4 (PF4), possibly leading to a may have lowered the estimated incidence of some condi- procoagulant state and even to “spontaneous heparin-in- tions. This is the case for septic pulmonary embolism as a duced thrombocytopenia.”20 complication of pelvic STP: its high incidence described in Thrombotic complications can derive either from the exces- the 1970s may have been partly due the exclusive use of the sive activation of coagulation or from the evasion of host poorly specific plain chest radiographs in the earliest diag- defenses by the pathogen. Prolonged sepsis damages endothe- noses.27 While thrombus demonstration is generally re- lial cells, leading to microvascular dysfunction and loss of quired for a diagnosis of dural STP and pylephlebitis, antithrombotic properties,11 while sepsis-associated neutro- Lemierre syndrome and pelvic STP can be diagnosed even phil extracellular traps (NETs) and neutrophil-derived extra- with negative imaging tests. In Lemierre syndrome, ultra- cellular vesicles also contribute to coagulation activation and sound, readily available in emergency settings, may miss the platelet aggregation.21 Some bacteria seem to have developed hallmark jugular vein thrombosis. In early stages, thrombi the ability to turn coagulation to their advantage. A well- may be fresh and poorly echogenic; in advanced stages, by documented example is the streptococcal ability to inhibit the time Fusobacterium or septic emboli are found, they may plasminogen and use the fibrin clot to shield themselves have resolved.23 Pelvic STP presents even more difficulties from the immune system.22 The combination of these mech- for the radiologist: no imaging techniques identify
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