Clinical Medicine Insights-Blood Disorders最新文献

{"title":"Enoxaparin Dosing for Venous Thromboembolism Prophylaxis in Low Body Weight Patients","authors":"Daniel Dybdahl, G. Walliser, M. Pershing, Christy Collins, David Robinson","doi":"10.1177/1179545X19863814","DOIUrl":"https://doi.org/10.1177/1179545X19863814","url":null,"abstract":"Background: The appropriate dose of enoxaparin for venous thromboembolism (VTE) prophylaxis in low body weight patients is unknown. Objective: The aim of this study is to evaluate the impact of enoxaparin dosing on major and minor bleeding events in low body weight patients. Methods: This was a retrospective cohort study of patients weighing less than 45 kg receiving subcutaneous (SC) enoxaparin for VTE prevention. The primary objective was to determine whether enoxaparin dose was associated with major and minor bleeding. The secondary objective was to determine the incidence of VTE by enoxaparin dose. Results: There were 173 patients included in the study, of which 37 patients received 2 different courses of enoxaparin during hospitalization, resulting in 210 enoxaparin courses. Among all enoxaparin courses, 16.2% were associated with major bleeding and 5.2% with minor bleeding. There was no difference in the incidence of major bleeding by dose (enoxaparin 30 mg SC daily, 30 mg SC twice daily, or 40 mg SC daily; P = .409). Patients who experienced major bleeding were older (54.9 ± 16.1 years) than patients who did not (48.4 ± 18.4 years) (P = .043). There was no difference in the incidence of minor bleeding by dosing schedule (P = .14). No patients experienced a VTE. Conclusion and Relevance: The risk of bleeding was similar by enoxaparin dose but increased with age in low body weight patients. Given the low incidence of VTE in this study, it is reasonable to consider decreasing the prophylactic enoxaparin dose in low body weight patients, especially in the elderly population.","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"11 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88706523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Serum Albumin Levels on Antithrombin Supplementation Outcomes Among Patients With Sepsis-Associated Coagulopathy: A Retrospective Study.","authors":"Masatomo Ebina,&nbsp;Kazunori Fujino,&nbsp;Akira Inoue,&nbsp;Koichi Ariyoshi,&nbsp;Yutaka Eguchi","doi":"10.1177/1179545X19858361","DOIUrl":"https://doi.org/10.1177/1179545X19858361","url":null,"abstract":"<p><strong>Background: </strong>Severe sepsis is commonly associated with mortality among critically ill patients and is known to cause coagulopathy. While antithrombin is an anticoagulant used in this setting, serum albumin levels are known to influence serum antithrombin levels. Therefore, this study aimed to evaluate the outcomes of antithrombin supplementation in patients with sepsis-associated coagulopathy, as well as the relationship between serum albumin levels and the effects of antithrombin supplementation.</p><p><strong>Methods: </strong>This retrospective study evaluated patients who were >18 years of age and had been admitted to either of two intensive care units for sepsis-associated coagulopathy. The groups that did and did not receive antithrombin supplementation were compared for outcomes up to 1 year after admission. Subgroup analyses were performed for patients with serum albumin levels of <2.5 g/dL or ⩾2.5 g/dL.</p><p><strong>Results: </strong>Fifty-one patients received antithrombin supplementation and 163 patients did not. The Cox proportional hazards model revealed that antithrombin supplementation was independently associated with 28-day survival (hazard ratio [HR]: 0.374, <i>P</i> = 0.025) but not with 1 year survival (HR: 0.915, <i>P</i> = 0.752). In addition, among patients with serum albumin levels of <2.5 g/dL, antithrombin supplementation was associated with a significantly lower 28-day mortality rate (9.4% vs 36.8%, <i>P</i> = .009).</p><p><strong>Conclusion: </strong>Antithrombin supplementation may improve short-term survival, but not long-term survival, among patients with sepsis-associated coagulopathy.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"12 ","pages":"1179545X19858361"},"PeriodicalIF":3.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X19858361","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37381283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffuse Large B-Cell Lymphoma Relapsing in Leukaemic Phase Presenting as Acute Leukaemia.","authors":"Priyavadhana Balasubramanian,&nbsp;Prashant Ramteke,&nbsp;Saumyaranjan Mallick,&nbsp;Lalit Kumar,&nbsp;Pranay Tanwar","doi":"10.1177/1179545X18821160","DOIUrl":"https://doi.org/10.1177/1179545X18821160","url":null,"abstract":"<p><p>Diffuse large B-cell lymphoma (DLBCL) accounts for 30% to 40% of the newly diagnosed adult non-Hodgkin lymphomas, but rarely presents in leukaemic phase. Here in, we report a case of DLBCL presenting in leukaemic phase and masquerading as acute leukaemia. A 28-year-old woman presented to our outpatient department with complaints of fever for 1 week. Her peripheral blood smear showed 5% to 8% blasts. Bone marrow aspirate showed an infiltration by ~30% blasts. Flow cytometry and immunohistochemistry confirmed relapse of DLBCL. Also, patient's poor response to therapeutic regimen for DLBCL prompted to consider second differential diagnosis of acute leukaemia. This case is a learning case, as it emphasizes the combined role of diagnostic ancillary techniques along with clinical judgments for management. The case also makes us more vigilant towards the pathobiology of DLBCL and dynamics of personalized individual treatment response.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"12 ","pages":"1179545X18821160"},"PeriodicalIF":3.0,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X18821160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36939993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Routine Preoperative Coagulation Tests in Children Undergoing Elective Surgery or Invasive Procedures: Are They Still Necessary?","authors":"Azzah Alzahrani,&nbsp;Nada Othman,&nbsp;Tahani Bin-Ali,&nbsp;Huda Elfaraidi,&nbsp;Eman Al Mussaed,&nbsp;Fahad Alabbas,&nbsp;Qanita Sedick,&nbsp;Fatma Albatniji,&nbsp;Ziyad Alshahrani,&nbsp;Mohammed Asiri,&nbsp;Omar Alsuhaibani,&nbsp;Ghaleb Elyamany","doi":"10.1177/1179545X18821158","DOIUrl":"https://doi.org/10.1177/1179545X18821158","url":null,"abstract":"<p><strong>Introduction: </strong>Preoperative coagulation screening tests in pediatric patients was once routine clinical practice globally and still used as standard practice in some countries before surgical procedures to assess of perioperative bleeding risk.</p><p><strong>Objective: </strong>The study aimed to evaluate unselected routine preoperative coagulation testing in children undergoing elective or invasive surgery to predict abnormal perioperative bleeding. The study also aimed to provide a rational approach of determining bleeding and family history of coagulation disorders as a predictive risk for bleeding.</p><p><strong>Methods: </strong>This retrospective study conducted between 2014 and 2015 (1 year) on normal healthy children aged under 15 years admitted to the hospitals for elective mild to intermediate surgery or invasive procedures. We reviewed and collected the details of the clinical history, previous surgery, trauma, family history, detail of anti-thrombotic medication and coagulation tests performed (prothrombin time (PT), the activated partial prothrombin time (APTT), and international normalized ratio (INR)) at the time of admission.</p><p><strong>Results: </strong>Among 2078 cases, 1940 cases had normal coagulation tests (93.4%), 77 cases had abnormal coagulation results (3.7%), and 61 patients underwent surgery without preoperative coagulation screening (2.9%). In 15 of 77 patients, coagulation tests were normal on repeat testing. A total of 52 were confirmed to have abnormal screening testing. Among these 52 cases, 45 had normal factors assay; where seven patients had abnormal factors assay. Postoperative bleeding occurred only in three cases (0.14%), two cases due to surgical procedures with normal preoperative testing and one due to hemophilia A which was detected postoperatively as no preoperative testing was performed.</p><p><strong>Conclusions: </strong>Routine coagulation screening before surgery or invasive procedures to predict perioperative bleeding in unselected patients is not recommended. Our study emphasizes that selective preoperative testing is more appropriate. Selective criteria for consideration of the latter includes physical examination, type of surgery, family and bleeding history, and concomitant use of antiplatelet and anti-thrombotic therapy.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"12 ","pages":"1179545X18821158"},"PeriodicalIF":3.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X18821158","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36864606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of Afternoon Plerixafor Administration for Stem Cell Mobilization.","authors":"Cynthia El Rahi,&nbsp;James Eldin Cox,&nbsp;Romelia May,&nbsp;George Carrum,&nbsp;Gloria Obi Anyadike,&nbsp;Audrey Scholoff,&nbsp;Rammurti Kamble","doi":"10.1177/1179545X18792253","DOIUrl":"https://doi.org/10.1177/1179545X18792253","url":null,"abstract":"<p><strong>Background: </strong>When used for hematopoietic stem cell mobilization, plerixafor was originally recommended to be administered 11 hours prior to apheresis based on the peak effect of 10 to 14 hours translating into an administration time of 10 to 11 pm. Reports of post-plerixafor anaphylactic reactions mandated labeling change by the Food and Drug Administration with recommendation of monitoring patients after administration. Based on data suggesting sustained plerixafor activity at 18 hours, we changed our administration time to 4 pm at our center.</p><p><strong>Objective: </strong>The objective of this study is to compare the stem cell collection efficiency before and after the practice change at our institution.</p><p><strong>Methods: </strong>A retrospective chart review for patients with multiple myeloma, Hodgkin lymphoma, and non-Hodgkin lymphoma who received a plerixafor-containing mobilization regimen was conducted. The primary end point was the percentage of patients achieving the minimal CD34⁺ cell goal in ⩽2 apheresis days. The secondary end points included the percentage of patients achieving the preferred CD34⁺ cell goal in ⩽2 apheresis days, days of apheresis, total CD34⁺ cells Collected, and engraftment time.</p><p><strong>Results: </strong>A total of 208 patients (4 pm group n = 68, 10 pm group n = 140) with multiple myeloma (n = 112), Hodgkin lymphoma (n = 10), and non-Hodgkin lymphoma (n = 86) were included in the analysis. About 91% and 89% (<i>P</i> = .804) of the patients in the 4 and 10 pm groups, respectively, collected minimum cell dose. Preferred CD34⁺ cell goal was achieved in 57% and 53% of patients in the 4 and 10 pm groups, respectively.</p><p><strong>Conclusions: </strong>Late afternoon administration of plerixafor provides efficient stem cell mobilization.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"11 ","pages":"1179545X18792253"},"PeriodicalIF":3.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X18792253","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36463118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Diving Bell and the Butterfly Revisited: A Fatal Case of Locked-in Syndrome in a Man With Epstein-Barr Virus-Positive Diffuse Large B-Cell Lymphoma, Not Otherwise Specified.","authors":"Jacqueline N Poston, Russell Dorer, David M Aboulafia","doi":"10.1177/1179545X18762799","DOIUrl":"10.1177/1179545X18762799","url":null,"abstract":"<p><p>Epstein-Barr virus (EBV)-positive diffuse large B-cell lymphoma (DLBCL) is a rare variant of DLBCL. The natural history of this subtype is poorly understood. Incomplete literature in the era of rituximab suggests that patients with EBV-positive DLBCL have similar outcomes to patients with EBV-negative DLBCL when treated with rituximab and anthracycline-based chemotherapy regimens; however, there are few prospective studies on this subtype and little is known about the risk of central nervous system (CNS) relapse with EBV-positive DLBCL. Herein, we describe the case of a 64-year-old man who presented with stage IIA EBV-positive DLBCL. His international age-adjusted International Prognostic Index (IPI) was 2. He achieved a complete response to 6 cycles of rituximab combined with chemotherapy consisting of dose-adjusted etoposide, prednisone, vincristine, cyclophosphamide, and doxorubicin. After 10 days of completion of chemotherapy, he had a fulminant neurologic decline manifested by diffuse weakness followed by a locked-in syndrome; he could only communicate by moving his eyes. He had been deemed at low risk for CNS relapse based on the application of the recently developed CNS-IPI score of 2 (1 point for age >60 years and 1 point for lactate dehydrogenase higher than normal) and consequently did not receive therapy for CNS prophylaxis. A limited postmortem autopsy revealed extensive lymphoma throughout the brain, particularly in the deep basal nuclei, midbrain, pons, centrum semiovale, and corpus callosum. This presentation of CNS relapse is rare and has not yet been described in EBV-positive DLBCL. We discuss some of the unique aspects of this case including the clinical manifestations of locked-in syndrome and its differential diagnosis and the uncertain benefits of CNS prophylaxis in this clinical context.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"11 ","pages":"1179545X18762799"},"PeriodicalIF":3.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X18762799","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35981327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preeclampsia: From Inflammation to Immunoregulation.","authors":"Denise C Cornelius","doi":"10.1177/1179545X17752325","DOIUrl":"https://doi.org/10.1177/1179545X17752325","url":null,"abstract":"<p><p>Preeclampsia (PE) affects 5% to 7% of pregnant women each year worldwide, accounts for up to 18% of maternal deaths in the United States each year, and is the number 1 cause of premature births. Preeclampsia is associated with hypertension after the 20th week of gestation with or without proteinuria, in conjunction with fetal growth restriction, maternal endothelial dysfunction, and chronic immune activation. The mechanisms leading to the development of PE are unclear. However, it is thought that shallow trophoblast invasion and insufficient remodeling of uterine spiral arteries result in placental ischemia. Consequently, an immune imbalance characterized by increases in proinflammatory CD4⁺ T cells and cytokines along with decreases in regulatory T cells and anti-inflammatory cytokines occurs. This imbalance leads to chronic inflammation and ensuing oxidative stress, proinflammatory cytokines, and autoantibodies. Studies performed in our laboratories, using the <i>R</i>educed <i>U</i>terine <i>P</i>erfusion <i>P</i>ressure (RUPP) rat model of placental ischemia, have demonstrated a role for this immune imbalance to mediate PE pathophysiology and identified potential mechanisms of immunoregulation that may be of benefit in the treatment of PE. Therefore, the purpose of this commentary is to review studies demonstrating the positive effects of immunoregulatory factors in the RUPP rat model of PE. Restoration of the immune balance in PE may be a potential strategy for the development of therapeutic interventions that could improve maternal and fetal outcomes associated with this maternal syndrome.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"11 ","pages":"1179545X17752325"},"PeriodicalIF":3.0,"publicationDate":"2018-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X17752325","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35768483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the Ginger Derivative, 6-Shogaol, on Ferritin Levels in Patients With Low to Intermediate-1-Risk Myelodysplastic Syndrome-A Small, Investigative Study.","authors":"Terry Golombick,&nbsp;Terrence H Diamond,&nbsp;Arumugam Manoharan,&nbsp;Rajeev Ramakrishna,&nbsp;Vladimir Badmaev","doi":"10.1177/1179545X17738755","DOIUrl":"https://doi.org/10.1177/1179545X17738755","url":null,"abstract":"<p><strong>Background: </strong>Myelodysplastic syndrome (MDS) is a heterogeneous group of clonal stem cell disorders characterized by dysplastic and ineffective hematopoiesis and peripheral cytopenias. Elevated serum ferritin (SF) is often observed in nontransfused, lower risk MDS. It has been reported that ineffective erythropoiesis enhances iron absorption in MDS through downregulation of hepcidin and its prohormones such that SF rises.</p><p><strong>Aim: </strong>To determine the effect of 6-shogaol, a dehydration derivative of ginger, known to have hepatoprotective and chemotherapeutic activity, on 6 early-stage, transfusion-independent patients with MDS, 3 of whom had raised levels of SF.</p><p><strong>Method: </strong>Six patients with MDS with low or intermediate-1 subtypes, as defined by the International Prognostic Scoring System (IPSS), were recruited into the study and were administered 1 gel capsule daily containing 20 mg ginger extract standardized for 20% 6-shogaol. Blood and urine samples were collected and various markers monitored at regular intervals.</p><p><strong>Results: </strong>6-shogaol caused a decrease in SF levels in 3 of 6 patients with early MDS (50%) whose SF levels were elevated at the start of the study. Our findings suggest upregulation of hepcidin and its prohormones, possibly through an improvement in liver function.</p><p><strong>Discussion: </strong>In light of the encouraging results in this small, investigative study, we are planning a larger study to confirm the beneficial effect of 6-shogaol in patients with raised ferritin levels due to ineffective erythropoiesis.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"10 ","pages":"1179545X17738755"},"PeriodicalIF":3.0,"publicationDate":"2017-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X17738755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35560268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffuse Large B-Cell Breast Lymphoma: A Case Series.","authors":"Afaf H Al Battah,&nbsp;Einas A Al Kuwari,&nbsp;Zsolt Hascsi,&nbsp;Abdulqadir J Nashwan,&nbsp;Halima Elomari,&nbsp;Hisham Elsabah,&nbsp;Safa Al Azawi,&nbsp;Samah Kohla,&nbsp;Dina Soliman,&nbsp;Mohamed A Yassin","doi":"10.1177/1179545X17725034","DOIUrl":"https://doi.org/10.1177/1179545X17725034","url":null,"abstract":"<p><p>Primary breast lymphoma (PBL) is a rare disease, and few clinicohistopathologic features of the disease have been discussed in previous studies. It represents 2.2% of extranodal lymphomas and constitutes 0.04% to 0.5% of malignant breast neoplasms, despite the clinical and radiographic similarities between breast lymphoma and carcinoma, the prognosis, as reported in the literature, varies. No consensus exists on the best way to treat PBL. However, radiotherapy and chemotherapy were used alone or in combination to treat various cases of PBL. We retrospectively studied 3 cases of PBL of the breast seen in patients attending a tertiary cancer center in Qatar, between 2012 and 2015, in an attempt to determine the common clinical features, therapy, and prognosis of PBL.</p>","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"10 ","pages":"1179545X17725034"},"PeriodicalIF":3.0,"publicationDate":"2017-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X17725034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35344394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thromboprophylaxis With Apixaban in Patients Undergoing Major Orthopedic Surgery: Meta-Analysis and Trial-Sequential Analysis.","authors":"Daniel Caldeira,&nbsp;Filipe B Rodrigues,&nbsp;Fausto J Pinto,&nbsp;Joaquim J Ferreira,&nbsp;João Costa","doi":"10.1177/1179545X17704660","DOIUrl":"https://doi.org/10.1177/1179545X17704660","url":null,"abstract":"<p><strong>Background: </strong>Venous thromboembolism (VTE) is a potentially fatal complication of orthopedic surgery, and until recently, few antithrombotic compounds were available for postoperative thromboprophylaxis. The introduction of the non-vitamin K antagonists oral anticoagulants (NOAC), including apixaban, has extended the therapeutic armamentarium in this field. Therefore, estimation of NOAC net clinical benefit in comparison with the established treatment is needed to inform clinical decision making.</p><p><strong>Objectives: </strong>Systematic review to assess the efficacy and safety of apixaban 2.5 mg twice a day versus low-molecular-weight heparins (LMWH) for thromboprophylaxis in patients undergoing knee or hip replacement.</p><p><strong>Data sources: </strong>MEDLINE, Embase, and CENTRAL were searched from inception to September 2016, other systematic reviews, reference lists, and experts were consulted.</p><p><strong>Study eligibility criteria participants and intervention: </strong>All major orthopedic surgery randomized controlled trials comparing apixaban 2.5 mg twice daily with LMWH, reporting thrombotic and bleeding events.</p><p><strong>Data extraction: </strong>Two independent reviewers, using a predetermined form.</p><p><strong>Study appraisal and synthesis methods: </strong>The Cochrane tool to assess risk bias was used by two independent authors. RevMan software was used to estimate pooled risk ratio (RR) and 95% confidence intervals (95% CI) using random-effects meta-analysis. Trial sequential analysis (TSA) was performed in statistical significant results to evaluate whether cumulative sample size was powered for the obtained effect. Overall confidence in cumulative evidence was assessed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) Working Group methodology.</p><p><strong>Results: </strong>Four studies comparing apixaban 2.5 mg twice daily with LMWH were included, with a total of 11.828 patients (55% undergoing knee and 45% hip replacement). The overall risk of bias across studies was low. In comparison with LMWH (all regimens), apixaban showed a significantly lower risk of VTE events and overall mortality combined (RR: 0.63, 95% CI: 0.42-0.95, <i>I</i>2 = 84%, n = 8346), but not of major VTE events (RR: 0.62, 95% CI: 0.32-1.19, <i>I</i>2 = 63%, n = 9493), or of symptomatic VTE events and VTE-related mortality combined (RR: 1.14, 95% CI: 0.68-1.90, <i>I</i>2 = 0%, n = 11 879). Trial sequential analysis showed that the risk reduction obtained for VTE and mortality was based on underpowered cumulative sample size and effect dimension. Subgroup analysis according to LMWH regimens showed that apixaban reduced the risk of VTE events and overall mortality, and major VTE events, when compared with LMWH once daily, without differences between apixaban and LMWH twice daily.</p><p><strong>Conclusions: </strong>There is low to moderate evidence that in patients undergoing knee or hip r","PeriodicalId":43083,"journal":{"name":"Clinical Medicine Insights-Blood Disorders","volume":"10 ","pages":"1179545X17704660"},"PeriodicalIF":3.0,"publicationDate":"2017-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1179545X17704660","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35058676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}