Background and aimsCancer provides challenges to the continuity of anticoagulant treatment in patients with atrial fibrillation (AF), e.g. through cancer-related surgery or complications. We aimed... Show moreBackground and aimsCancer provides challenges to the continuity of anticoagulant treatment in patients with atrial fibrillation (AF), e.g. through cancer-related surgery or complications. We aimed to provide data on the incidence and reasons for interrupting and discontinuing anticoagulant treatment in AF patients with cancer and to assess its contribution to the risk of thromboembolism (TE) and major bleeding (MB).MethodsThis retrospective study identified AF patients with cancer in two hospitals between 2012 and 2017. Data on anticoagulant treatment, TE and MB were collected during two-year follow-up. Incidence rates (IR) per 100 patient-years and adjusted hazard ratios (aHR) were obtained for TE and MB occurring during on- and off-anticoagulant treatment, during interruption and after resumption, and after permanent discontinuation.Results1213 AF patients with cancer were identified, of which 140 patients permanently discontinued anticoagulants and 426 patients experienced one or more interruptions. Anticoagulation was most often interrupted or discontinued due to cancer-related treatment (n = 441, 62 %), bleeding (n = 129, 18 %) or end of life (n = 36, 5 %). The risk of TE was highest off-anticoagulation and during interruptions, with IRs of 19 (14–25)) and 105 (64–13), and aHRs of 3.1 (1.9–5.0) and 4.6 (2.4–9.0), respectively. Major bleeding risk were not only increased during an interruption, but also in the first 30 days after resumption, with IRs of 33 (12–72) and 30 (17–48), and aHRs of 3.3 (1.1–9.8) and 2.4 (1.2–4.6), respectively.ConclusionsInterruption of anticoagulation therapy harbors high TE and MB risk in AF patients with cancer. The high incidence rates call for better (periprocedural) anticoagulant management strategies tailored to the cancer setting. Show less
von Willebrand factor (VWF) is a multimeric glycoprotein involved in primary hemostasis, recruiting platelets to the site of damaged vessels and acting as a carrier for factor VIII. Quantitative or... Show morevon Willebrand factor (VWF) is a multimeric glycoprotein involved in primary hemostasis, recruiting platelets to the site of damaged vessels and acting as a carrier for factor VIII. Quantitative or qualitative alterations of VWF cause von Willebrand disease (VWD), an inherited bleeding disorder. Conversely, increased VWF levels have been associated with various thrombotic conditions. In this thesis, we investigated the dual role of VWF in bleeding and thrombosis, focusing on VWD and deep vein thrombosis (DVT). In the first part of the thesis, we demonstrated the utility of in silico tools and heterologous cell systems in proving the disease-causing role of VWF variants thus contributing to the confirmation of patient diagnoses. In the second part, we focused on type 3 VWD, the most severe form of this disorder caused by a lack of VWF. We showed that patients with missense variants had a higher VWF propeptide/VWF antigen ratio than carriers of VWF null alleles. This suggested that secreted VWF is rapidly removed from circulation in these patients. Subsequently, we estimated the prevalence of VWF neutralizing and non-neutralizing antibodies, confirming that they are rare side effects of replacement therapy. We also demonstrated that the detection of epitope-specific VWF inhibitors is affected by the test used. In the last part of the thesis, we evaluated the role of ADAMTS13-VWF equilibrium in the pathogenesis of DVT, showing that a slight decrease in ADAMTS13 activity, particularly when combined with increased VWF levels, increases DVT risk. We then sequenced ADAMTS13, VWF, and F8 genes and confirmed that DVT patients carrying a rare ADAMTS13 variant exhibited lower ADAMTS13 activity than non-carriers. Show less
BACKGROUNDS: planchnic vein thrombosis (SVT) is a major complication of moderate and severe acute pancreatitis. There is no consensus on whether therapeutic anticoagulation should be started in... Show moreBACKGROUNDS: planchnic vein thrombosis (SVT) is a major complication of moderate and severe acute pancreatitis. There is no consensus on whether therapeutic anticoagulation should be started in patients with acute pancreatitis and SVT. AIM: To gain insight into current opinions and clinical decision making of pancreatologists regarding SVT in acute pancreatitis. METHODS: A total of 139 pancreatologists of the Dutch Pancreatitis Study Group and Dutch Pancreatic Cancer Group were approached to complete an online survey and case vignette survey. The threshold to assume group agreement was set at 75%. RESULTS: The response rate was 67% (n = 93). Seventy-one pancreatologists (77%) regularly prescribed therapeutic anticoagulation in case of SVT, and 12 pancreatologists (13%) for narrowing of splanchnic vein lumen. The most common reason to treat SVT was to avoid complications (87%). Acute thrombosis was the most important factor to prescribe therapeutic anticoagulation (90%). Portal vein thrombosis was chosen as the most preferred location to initiate therapeutic anticoagulation (76%) and splenic vein thrombosis as the least preferred location (86%). The preferred initial agent was low molecular weight heparin (LMWH; 87%). In the case vignettes, therapeutic anticoagulation was prescribed for acute portal vein thrombosis, with or without suspected infected necrosis (82% and 90%), and thrombus progression (88%). Agreement was lacking regarding the selection and duration of long-term anticoagulation, the indication for thrombophilia testing and upper endoscopy, and about whether risk of bleeding is a major barrier for therapeutic anticoagulation. CONCLUSION: In this national survey, the pancreatologists seemed to agree on the use of therapeutic anticoagulation, using LMWH in the acute phase, for acute portal thrombosis and in the case of thrombus progression, irrespective of the presence of infected necrosis. Show less
Hemophilia is a rare X-linked hereditary bleeding disorder, caused by a mutation in the F8 or F9 gene. In the last 50 years, hemophilia treatment has changed tremendously and the impact of these... Show moreHemophilia is a rare X-linked hereditary bleeding disorder, caused by a mutation in the F8 or F9 gene. In the last 50 years, hemophilia treatment has changed tremendously and the impact of these changes on current clinical outcomes is unknown.Therefore, we comprehensively assessed the changes in health status over time of patients with hemophilia using observational study data. Our results show that clinical outcomes of these patients have improved tremendously over the past decades. The annual bleeding rate and the proportion of patients with joint impairment have decreased strongly. In addition, HCV has almost been eradicated among patients with hemophilia in the Netherlands. As a result, life expectancy has increased to where it is almost equal to that of the general population.Although clinical outcomes have improved in many ways, inhibitor development continues to be a significant problem in patients treated with clotting factor products. Therefore, using three different study approaches, we also evaluated several methods to better predict the risk of inhibitor development (which is still a significant complication of treatment with FVIII). The results of these studies are promising and could be used to improve current inhibitor prediction strategies and inform future research on this topic. Show less
Bleeding events are frequently encountered in hemato-oncology patients. To prevent this, in periods of thrombocytopenia patients receive prophylactic platelet transfusions, based on the platelet... Show moreBleeding events are frequently encountered in hemato-oncology patients. To prevent this, in periods of thrombocytopenia patients receive prophylactic platelet transfusions, based on the platelet counts. However, beside platelet counts many other patients factors likely contribute to the bleeding risk.In this thesis we focus on describing current clinical practice to prevent bleedings in a subpopulation of patients with persistent deep thrombocytopenia, risk factors for bleeding, and prediction of bleeding. We also describe a ongoing study which aims to identify and quantify risk factors in future.With this knowledge, in the ultimate goal is to predict bleeding more accurate based on patient characteristics and/or biomarkers. This could be a first step towards more personalized bleeding prevention strategies. Show less
The scope of the thesis is: “bleeding in patients with hypoproliferative thrombocytopenia”. Despite platelet transfusions bleeding occurs frequently in these patients and besides highlighting the... Show moreThe scope of the thesis is: “bleeding in patients with hypoproliferative thrombocytopenia”. Despite platelet transfusions bleeding occurs frequently in these patients and besides highlighting the variance in methodology of assessing bleeding symptoms and reporting in different bleeding scales, various risk factors for bleeding are illustrated in the introduction of the thesis. In the three following chapters the scoring of bleeding symptoms, the adjudication of symptoms in bleeding scales and the methodology concerning these aspects and more of a large platelet transfusion trial comparing pathogen reduced platelets (by using the Mirasol technique) to control platelet products is described. Chapter five describes the results of this randomized controlled trial and in the following chapter the association between endothelial damage (as measured by microalbuminuria in patients) and bleeding is described. Alternative bleeding scales besides the WHO bleeding scale are described in chapter seven and the last chapter summarizes the findings. Show less
Introduction: Pancreatic cancer is associated with a high risk of venous thromboembolism (VTE). However, comprehensive data on incidence, timing and relevant determinants of VTE in this particular... Show moreIntroduction: Pancreatic cancer is associated with a high risk of venous thromboembolism (VTE). However, comprehensive data on incidence, timing and relevant determinants of VTE in this particular population are scarce. Current study assesses incidence, timing and predictors of VTE in pancreatic cancer through different phases of disease. Methods: All pancreatic cancer patients treated in our tertiary referral center between 2013 through 2017 were studied. Occurrence of VTE was evaluated from diagnosis through end of follow-up or death. Relevant de-terminants of VTE were identified in logistic regression models. Hazard ratios were calculated to evaluate impact of VTE on overall survival. Results: In total, 361 patients were followed for a median period of 43 months; 64 were diagnosed with VTE (18%). Most were tumor related thrombosis (59%), incidental (75%) and occurred after anti-cancer treatment had been stopped (80%), only 1.6% occurred during remission phase. Stage IV pancreatic cancer was a predictor for VTE (hazard ratio (HR) 2.46, 95% confidence interval (CI) 0.9-6.8). Biliary drainage (HR 0.52, 95%CI 0.28-0.98) and tumor resection (HR 0.45, 95%CI 0.45-1.83) were protective factors. VTE was not associated with worse survival (HR 1.3; 95% CI 0.97-1.74). Conclusions: VTE in pancreatic cancer is disease-stage dependent, with 80% occurring in advanced phases of disease when patients no longer receive active treatment. We speculate that this is the main reason for the absence of a survival effect of VTE in our cohort. These practice-based findings should be taken into account when considering wide-spread introduction of primary thromboprophylaxis in patients with pancreatic cancer. Show less
Milicic, D.; Avraham, B. ben; Chioncel, O.; Barac, Y.D.; Goncalvesova, E.; Grupper, A.; ... ; Gal, T. ben 2021
The improvement in left ventricular assist device (LVAD) technology and scarcity of donor hearts have increased dramatically the population of the LVAD-supported patients and the probability of... Show moreThe improvement in left ventricular assist device (LVAD) technology and scarcity of donor hearts have increased dramatically the population of the LVAD-supported patients and the probability of those patients to present to the emergency department with expected and non-expected device-related and patient-device interaction complications. The ageing of the LVAD-supported patients, mainly those supported with the 'destination therapy' indication, increases the risk for those patients to suffer from other co-morbidities common in the older population. In this second part of the trilogy on the management of LVAD-supported patients for the non-LVAD specialist healthcare provider, definitions and structured approach to the LVAD-supported patient presenting to the emergency department with bleeding, neurological event, pump thrombosis, chest pain, syncope, and other events are presented. The very challenging issue of declaring death in an LVAD-supported patient, as the circulation is artificially preserved by the device despite no other signs of life, is also discussed in detail. Show less
Blood coagulation is a complex system in which the proteins of the coagulation cascade play an important role. Aberrations in pro- or anticoagulant protein levels may be at the basis of coagulation... Show moreBlood coagulation is a complex system in which the proteins of the coagulation cascade play an important role. Aberrations in pro- or anticoagulant protein levels may be at the basis of coagulation-related pathological events, such as bleeding or thrombosis. Here the relations of altered coagulation factor levels and venous thromboembolism, the tissue factor threshold which needs to be overcome to initiate coagulation and the in vitro validation of APC-resistant FV as a possible alternative treatment of factor XI deficiency are explored. Show less
Wall, S.J. van der; Rein, N. van; Bemt, B. van den; Kruip, M.J.H.A.; Meijer, K.; Boome, L.C.J. te; ... ; Huisman, M. 2019
Aims Because practice-based data on the usage of idarucizumab for urgent dabigatran reversal is unavailable, we evaluated the appropriateness of idarucizumab usage, its haemostatic effectiveness... Show moreAims Because practice-based data on the usage of idarucizumab for urgent dabigatran reversal is unavailable, we evaluated the appropriateness of idarucizumab usage, its haemostatic effectiveness and clinical outcomes.Methods and results An observational cohort study was performed including consecutive patients who were treated with idarucizumab between 2016 and 2018. Appropriate usage was assessed with predefined criteria. Post-reversal effectiveness was evaluated according to International Society on Thrombosis and Haemostasis (ISTH) recommendations. Patients were followed for 90 days for occurrence of thromboembolism, (re-) bleeding and death. Idarucizumab was used in 88 patients, of whom 53 (60%) presented with severe bleeding (20 gastrointestinal and 18 intracranial) and 35 (40%) requiring urgent surgical intervention. Use of idarucizumab was judged inappropriate in 25 patients (28%). Effective haemostasis was achieved in 32 of 48 (67%) bleeding patients in whom assessment was possible. Seven of 16 patients with major bleeding who did not achieve effective haemostasis (five intracranial) died, compared with two of 32 patients with effective haemostasis (relative risk 7.0, 95% confidence interval 1.6-30). Four patients (4.2%) developed thromboembolism [2 (2.1%) within 30 days] and four patients (4.2%) re-bleeding, all within 10 days. Seventeen patients (19%) died; 10 (11%) within 5 days.Conclusion In this practice-based cohort, idarucizumab use was considered inappropriate in 28% of patients. Effective haemostasis was achieved in two-third of bleeding patients and was associated with lower mortality risk. Clinical outcomes were similar to those observed in the RE-VERSE AD trial, comprising re-bleeds and thromboembolism, and a high-mortality rate. Show less
The overall goal of this thesis was to identify patients who are at high risk for major bleedings during anticoagulant treatment and to reduce the number of major bleeds. The first part looks... Show moreThe overall goal of this thesis was to identify patients who are at high risk for major bleedings during anticoagulant treatment and to reduce the number of major bleeds. The first part looks into methodology of observational studies. It shows that biases in observational studies may be an explanation why statins seem to have many unintended effects. The second part looks into bleeding complications and shows that patient with three concomitant anticoagulants experience high major bleeding rates. Also, a study was performed in which plasma and DNA of participants was collected, to identify risk factors for major bleeds in the future. The first results show that damage to vessel walls increases the risk of major bleeding. Interventions to reduce the number of bleeding events were to dose nadroparin od instead of bid. In addition, multi-dose drug dispensing may increase adherence of medication. Also, vitamin K1 tablets are easier to ingest and this thesis shows that the tablets are as effective in reducing the INR as the oral solution. Show less
This thesis describes new knowledge of FNAIT in preparation of a national wide screening program. It illustrates the prevalence of FNAIT among pregnant women and the risk of adverse outcome,... Show moreThis thesis describes new knowledge of FNAIT in preparation of a national wide screening program. It illustrates the prevalence of FNAIT among pregnant women and the risk of adverse outcome, outlines current management, evaluates risks of missing a diagnosis of FNAIT, studies the efficacy of a lower dose of immunoglobulins in preventing bleedingcomplications,shows the time of bleeding onset of fetal ICH during pregnancy and illustrates the longterm outcome of children with ICH. Show less
Aim of this thesis was to evaluate contemporary care and prognosis for patients with acute coronary syndrome and identify pitfalls in its treatment. Complications after coronary stent implantation... Show moreAim of this thesis was to evaluate contemporary care and prognosis for patients with acute coronary syndrome and identify pitfalls in its treatment. Complications after coronary stent implantation were explored and demonstrated that in sirolimus-eluting stents, the benefit of reduced repeat revascularization during one year after primary PCI was not sustained during long-term follow-up. Additionally, an increased risk of very late stent thrombosis was suggested. Late stent malapposition, more commonly observed after this stent type and suspected to be involved in the multifactorial etiology of stent thrombosis, is shown to persist in the greater portion of STEMI patients during long-term follow-up, depending on the degree of vessel wall remodelling and change in plaque burden. Women were identified as a sub-population with poorer prognosis early after STEMI. Identification of high-risk patients, and estimation of infarct size and prognosis, which a single measurement of troponin already may indicate, facilitates individualized treatment and likely results in better outcomes. Although numerous novel treatment modalities emerged in recent years, certain pitfalls become increasingly important. Major bleeding is one of them, responsible for an excess mortality amongst STEMI patients after primary PCI, and should be incorporated in risk stratification models for the choice of treatment strategy. Show less
