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Morgan D, Kang J, Levine C, Acharya, S. Evaluation of the Safety and Efficacy of Enoxaparin Once-Daily Versus Twice-Daily Dosing for Prophylaxis in Pediatric Patients. J Pediatr Pharmacol Ther 2024; 29:130-134. [PMID: 38596416 PMCID: PMC11001208 DOI: 10.5863/1551-6776-29.2.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 06/01/2023] [Indexed: 04/11/2024]
Abstract
OBJECTIVES Enoxaparin for the prevention of venous thromboembolism (VTE) in pediatric patients is -typically dosed twice a day. The use of once-daily dosing like that used in adult patients is limited because of a lack of safety and efficacy data. The aim of this study was to evaluate the safety and efficacy of -once-daily versus twice-daily dosing of enoxaparin for pediatric VTE prophylaxis based on incidence of thrombotic and bleeding events. METHODS This was a 3-year retrospective chart review of enoxaparin received for VTE prophylaxis at -Cohen Children's Medical Center, New Hyde Park, NY. Exclusion criteria were age 18 years or older, and renal dysfunction. RESULTS A total of 177 enoxaparin courses (81 in the once-daily and 96 in the twice-daily group) were included. The median dose in the once-daily group was 0.68 mg/kg/dose with dose capping at 40 mg/dose in 70% of patients. One patient in the once-daily group had a VTE, whereas no patients in the twice-daily group experienced a VTE. One major bleeding event occurred in the once-daily group (p = 0.46); however, minor bleeding events were comparable between the 2 groups (p = 0.69). CONCLUSIONS Once-daily enoxaparin prophylaxis appears to be safe and effective based on minimal -differences in incidence of thrombotic and bleeding events when compared to twice-daily dosing. Based on this study, it may be reasonable to consider once-daily enoxaparin dosing for prophylaxis, especially in older children. A larger multicenter cohort study evaluating once-daily dosing for prophylaxis is warranted to validate the safety and efficacy specifically for risk-based dosing strategies.
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Affiliation(s)
- Danielle Morgan
- Department of Pharmacy (DM, JK), Cohen Children’s Medical Center, New Hyde Park, NY
| | - Jinjoo Kang
- Department of Pharmacy (DM, JK), Cohen Children’s Medical Center, New Hyde Park, NY
| | - Chana Levine
- Department of Hematology (CL, SA), Cohen Children’s Medical Center, New Hyde Park, NY
| | - Suchitra Acharya,
- Department of Hematology (CL, SA), Cohen Children’s Medical Center, New Hyde Park, NY
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2
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Gibson A, Montanez N, Addy K, Hashmi SS, Brown D, Rodriguez N, Menon N, Srivaths L. Once-daily Compared With Twice-daily Enoxaparin Maintenance Therapy Appears Safe and Efficacious in Pediatric Venous Thromboembolism. J Pediatr Hematol Oncol 2023; 45:e655-e659. [PMID: 36449733 DOI: 10.1097/mph.0000000000002601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 10/16/2022] [Indexed: 12/03/2022]
Abstract
INTRODUCTION Once-daily enoxaparin (ODE), considered standard of care for venous thromboembolism (VTE) treatment in adults, has been infrequently assessed in children. To contribute available data to a limited field, we reviewed our center's experience with ODE in treating pediatric VTE compared with twice-daily enoxaparin (TDE). MATERIALS AND METHODS A retrospective analysis of children and adolescents 18 years of age or below diagnosed with VTE and treated at our institution with ODE or TDE maintenance therapy between April 2015 and December 2020 was performed. Patient demographics, clinical and laboratory data pertaining to VTE diagnosis, and management were gathered from electronic medical records and compared between the 2 cohorts. RESULTS Seventy-one children met the eligibility criteria. All patients were initially treated with TDE for 2 weeks before transitioning to ODE maintenance therapy (n=39; 55%) or continuing with TDE dosing (n=32; 45%).Extremity VTE was more common in ODE ( P =0.051) versus pulmonary/intracardiac sites in TDE ( P =0.002) when compared with other sites. Median enoxaparin dosing was 1.5 and 1.1 mg/kg/dose in ODE and TDE cohorts, respectively. Bleeding episodes were rare without any difference between the cohorts. Two patients (6%) were lost to follow up in TDE cohort. All evaluable patients in both cohorts had either complete/partial response (ODE n=35 [90%]; TDE n=24 [75%] or stable thrombus ODE n=4 [10%]; TDE n=6 [19%]). CONCLUSIONS Our results indicate that ODE, used after the initial TDE treatment period, is as safe and efficacious as TDE maintenance for the treatment of pediatric VTE. The difference in VTE sites may have contributed to the equal efficacy of both the cohorts. Future prospective studies in pediatric VTE are needed to validate these results.
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Affiliation(s)
| | | | | | - S Shahrukh Hashmi
- Department of Pediatrics, McGovern Medical School, University of Texas Health and Science Center of Houston, Houston, TX
| | - Deborah Brown
- University of Texas MD Anderson Cancer Center
- Gulf States Hemophilia and Thrombophilia Center
- Department of Pediatrics, McGovern Medical School, University of Texas Health and Science Center of Houston, Houston, TX
| | - Nidra Rodriguez
- University of Texas MD Anderson Cancer Center
- Gulf States Hemophilia and Thrombophilia Center
- Department of Pediatrics, McGovern Medical School, University of Texas Health and Science Center of Houston, Houston, TX
| | - Neethu Menon
- University of Texas MD Anderson Cancer Center
- Gulf States Hemophilia and Thrombophilia Center
- Department of Pediatrics, McGovern Medical School, University of Texas Health and Science Center of Houston, Houston, TX
| | - Lakshmi Srivaths
- Gulf States Hemophilia and Thrombophilia Center
- Department of Pediatrics, McGovern Medical School, University of Texas Health and Science Center of Houston, Houston, TX
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Dain AS, Raffini L, Whitworth H. Thrombotic events in critically ill children with coronavirus disease 2019 or multisystem inflammatory syndrome in children. Curr Opin Pediatr 2022; 34:261-267. [PMID: 35634699 PMCID: PMC9197313 DOI: 10.1097/mop.0000000000001130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE OF REVIEW To provide an update regarding what is known about thrombotic events and thromboprophylaxis in critically ill children with SARS-CoV-2 infection. RECENT FINDINGS Pediatric patients with SARS-CoV-2 generally have mild illness; however, intensive care is required in about 20-30% of hospitalized children with COVID-19 and an even higher proportion in those with MIS-C. Increased rates of thrombosis have been observed in adults hospitalized with COVID-19, and clinical trials have attempted to optimize thromboprophylaxis. There is significant variability in the estimated incidence of thrombosis in pediatric patients (0-27%) because of variation in patient populations and study design. Multiple studies demonstrate an increased rate of thrombosis compared with baseline in hospitalized pediatric patients. Few studies have evaluated risk factors for thrombosis, but critical illness, older age, and other known thrombosis risk factors appear to increase the risk. Thromboprophylaxis strategies are inconsistent, with little evidence of efficacy but few reports of major bleeding. SUMMARY Critically ill children with SARS-CoV-2-related illnesses are at increased risk of thrombosis. Thromboprophylaxis should be considered in select patients with COVID-19 or MIS-C, though the optimal strategy is not yet known. More data is required to guide practice to prevent thrombosis in this population.
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Affiliation(s)
| | - Leslie Raffini
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Hilary Whitworth
- Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Dobbie LJ, Lamb A, Eskell L, Ramage IJ, Reynolds BC. Thromboprophylaxis in congenital nephrotic syndrome: 15-year experience from a national cohort. Pediatr Nephrol 2021; 36:1183-1194. [PMID: 33089377 PMCID: PMC8009789 DOI: 10.1007/s00467-020-04793-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 09/02/2020] [Accepted: 09/19/2020] [Indexed: 11/08/2022]
Abstract
INTRODUCTION Congenital nephrotic syndrome (CNS) is an ultra-rare disease associated with a pro-thrombotic state and venous thromboembolisms (VTE). There is very limited evidence evaluating thromboprophylaxis in patients with CNS. This study aimed to determine the doses and duration of treatment required to achieve adequate thromboprophylaxis in patients with CNS. METHODS From 2005 to 2018 children in Scotland with a confirmed genetic or histological diagnosis of CNS were included if commenced on thromboprophylaxis. The primary study endpoint was stable drug monitoring. Secondary outcomes included VTE or significant haemorrhage. RESULTS Eight patients were included; all initially were commenced on low-molecular weight heparin (enoxaparin). Four patients maintained therapeutic anti-Factor Xa levels (time 3-26 weeks, dose 3.2-5.07 mg/kg/day), and one patient developed a thrombosis (Anti-Factor Xa: 0.27 IU/ml). Four patients were subsequently treated with warfarin. Two patients maintained therapeutic INRs (time 6-11 weeks, dose 0.22-0.25 mg/kg/day), and one patient had two bleeding events (Bleed 1: INR 6, Bleed 2: INR 5.5). CONCLUSIONS Achieving thromboprophylaxis in CNS is challenging. Similar numbers of patients achieved stable anticoagulation on warfarin and enoxaparin. Enoxaparin dosing was nearly double the recommended starting doses for secondary thromboprophylaxis. Bleeding events were all associated with supra-therapeutic anticoagulation.
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Affiliation(s)
| | - Angela Lamb
- grid.415571.30000 0004 4685 794XDepartment of Paediatric Nephrology, Royal Hospital for Children, 1345 Govan Road, Glasgow, G51 4TF UK
| | - Lucy Eskell
- grid.415571.30000 0004 4685 794XDepartment of Paediatric Nephrology, Royal Hospital for Children, 1345 Govan Road, Glasgow, G51 4TF UK
| | - Ian J. Ramage
- grid.8756.c0000 0001 2193 314XUniversity of Glasgow, Glasgow, UK ,grid.415571.30000 0004 4685 794XDepartment of Paediatric Nephrology, Royal Hospital for Children, 1345 Govan Road, Glasgow, G51 4TF UK
| | - Ben C. Reynolds
- grid.8756.c0000 0001 2193 314XUniversity of Glasgow, Glasgow, UK ,grid.415571.30000 0004 4685 794XDepartment of Paediatric Nephrology, Royal Hospital for Children, 1345 Govan Road, Glasgow, G51 4TF UK
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Shen X, Wile R, Young G. FondaKIDS III: A long-term retrospective cohort study of fondaparinux for treatment of venous thromboembolism in children. Pediatr Blood Cancer 2020; 67:e28295. [PMID: 32307822 DOI: 10.1002/pbc.28295] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 03/03/2020] [Accepted: 03/15/2020] [Indexed: 11/11/2022]
Abstract
BACKGROUND The incidence of venous thromboembolism (VTE) and use of anticoagulation are rising in children, but treatment options remain limited. As a newer anticoagulant, fondaparinux may be a safe and effective alternative with the benefit of once-daily dosing, but there is relatively little data supporting its use. PROCEDURE This retrospective cohort study describes the long-term dosing, efficacy, and safety of fondaparinux for treatment of VTE in children at a single institution. The study included children <18 years old treated with fondaparinux for VTE between 2008 and 2018. Descriptive statistics were used to present the findings. RESULTS A total of 277 patients were identified and analyzed in this study. Seventy-six percent of patients reached therapeutic levels with 0 or 1 dose adjustments over a median treatment duration of 93 days. Of the patients included in the efficacy analysis, 91% of patients had improvement in their clot status, including 69% (160/233) with complete resolution and 22% (53/233) with partial resolution. Twenty-six patients (11%) had VTE recurrence, but only seven (3%) of the new thrombi developed while on fondaparinux. Major bleeding occurred in seven patients (2.5%), primarily in patients with underlying medical conditions with increased bleeding risk. Minor bleeding occurred in 53 patients (19%). CONCLUSIONS This study demonstrates the stable long-term pediatric dosing of fondaparinux with similar efficacy and safety when compared to other anticoagulants. Given its advantages, fondaparinux can be considered a reasonable alternative for treatment of VTE in children.
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Affiliation(s)
- Xiaofan Shen
- Children's Center for Cancer and Blood Diseases, Children's Hospital Los Angeles, Los Angeles, California
| | - Rachel Wile
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California
| | - Guy Young
- Children's Center for Cancer and Blood Diseases, Children's Hospital Los Angeles, Los Angeles, California.,Keck School of Medicine, University of Southern California, Los Angeles, California
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Jaffray J, Young G. Deep vein thrombosis in pediatric patients. Pediatr Blood Cancer 2018; 65. [PMID: 29115714 DOI: 10.1002/pbc.26881] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 10/09/2017] [Accepted: 10/10/2017] [Indexed: 01/19/2023]
Abstract
Due to advances in caring for critically ill children and those with chronic diseases, rates of deep vein thrombosis (DVT) are increasing in children. Risk factors consist of central venous catheters, chronic medical conditions, thrombophilia, and various medications. Compression Doppler ultrasonography is the method most commonly used to diagnose DVT, and patients will usually present with pain and swelling of the affected limb. Anticoagulation via subcutaneous injection is the most common treatment regime for children with DVT, and the new, direct oral anticoagulants are currently under investigation. Prevention techniques are not established, but clinical studies are addressing this need.
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Affiliation(s)
- Julie Jaffray
- Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Guy Young
- Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
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Abstract
Venous thromboembolism is occurring with increasing frequency in children resulting in the more widespread use of anticoagulation in pediatrics. Antithrombotic drugs in children can be divided into the standard and alternative agents. This review discusses standard and alternative anticoagulants. Because standard anticoagulants have significant limitations, including variable pharmacokinetics, issues with therapeutic drug monitoring, frequency of administration, efficacy, and adverse effects, it is expected that the use of alternative anticoagulants will increase over time. With their improved properties and recent prospective clinical trial data, the current and future use of these agents will likely slowly replace of the standard anticoagulants.
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Affiliation(s)
- Guy Young
- Hemostasis and Thrombosis Center, Children's Hospital Los Angeles, Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Southern California Keck School of Medicine, 4650 Sunset Blvd, Los Angeles, CA 90027, USA.
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8
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Moffett BS, Lee-Kim Y, Galati M, Mahoney D, Shah MD, Teruya J, Yee D. Population Pharmacokinetics of Enoxaparin in Pediatric Patients. Ann Pharmacother 2017; 52:140-146. [DOI: 10.1177/1060028017734234] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Brady S. Moffett
- Texas Children’s Hospital, Houston, TX, USA
- Baylor College of Medicine, Houston, TX, USA
| | | | | | | | | | - Jun Teruya
- Baylor College of Medicine, Houston, TX, USA
| | - Donald Yee
- Baylor College of Medicine, Houston, TX, USA
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9
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Young G, Male C, van Ommen CH. Anticoagulation in children: Making the most of little patients and little evidence. Blood Cells Mol Dis 2017; 67:48-53. [PMID: 28552476 DOI: 10.1016/j.bcmd.2017.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 04/25/2017] [Accepted: 05/03/2017] [Indexed: 01/19/2023]
Abstract
Thrombotic complications are increasing at a steady and significant rate in children resulting in the more widespread use of anticoagulation in this population. Anticoagulant drugs in children can be divided into the standard agents (heparin, low molecular weight heparin, and vitamin K antagonists) and alternative agents (argatroban, bivalirudin, and fondaparinux). This review will compare and contrast the standard and alternative anticoagulants and suggest situations in which it may be appropriate to use argatroban, bivalirudin, and fondaparinux. Clearly, the standard anticoagulants all have significant shortcomings including variable pharmacokinetics, issues with therapeutic drug monitoring, frequency of administration, efficacy, and adverse effects. The alternative anticoagulants have properties which overcome these shortcomings and prospective clinical trial data are presented supporting the current and future use of these agents in place of the standard anticoagulants.
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Affiliation(s)
- Guy Young
- Children's Hospital Los Angeles, University of Southern California Keck School of Medicine.
| | - Christoph Male
- Department of Paediatrics, Medical University of Vienna, Vienna, Austria
| | - C Heleen van Ommen
- Department of Pediatric Hematology/Oncology, Erasmus MC Sophia's Children's Hospital, Rotterdam, Netherlands
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10
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Enoxaparin: Route Cause Analysis. Pediatr Crit Care Med 2017; 18:494-495. [PMID: 28475536 DOI: 10.1097/pcc.0000000000001140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Betensky M, Bittles MA, Colombani P, Goldenberg NA. How We Manage Pediatric Deep Venous Thrombosis. Semin Intervent Radiol 2017; 34:35-49. [PMID: 28265128 PMCID: PMC5334487 DOI: 10.1055/s-0036-1597762] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Over the past two decades, the incidence and recognition of venous thromboembolism (VTE) in children has significantly increased, likely as a result of improvements in the medical care of critically ill patients and increased awareness of thrombotic complications among medical providers. Current recommendations for the management of VTE in children are largely based on data from pediatric registries and observational studies, or extrapolated from adult data. The scarcity of high-quality evidence-based recommendations has resulted in marked variations in the management of pediatric VTE among providers. The purpose of this article is to summarize our institutional approach for the management of VTE in children based on available evidence, guidelines, and clinical practice considerations. Therapeutic strategies reviewed in this article include the use of conventional anticoagulants, parenteral targeted anticoagulants, new direct oral anticoagulants, thrombolysis, and mechanical approaches for the management of pediatric VTE.
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Affiliation(s)
- Marisol Betensky
- Pediatric Thrombosis Program, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
- Division of Hematology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Mark A. Bittles
- Department of Radiology, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
| | - Paul Colombani
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
- Department of Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
| | - Neil A. Goldenberg
- Pediatric Thrombosis Program, Johns Hopkins All Children's Hospital, St. Petersburg, Florida
- Division of Hematology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
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12
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Abstract
Thrombotic complications are increasing at a steady and significant rate in children, resulting in the more widespread use of anticoagulation in this population. Anticoagulant drugs in children can be divided into the older multitargeted agents (heparin, low-molecular-weight heparin, and warfarin) and the newer targeted agents (argatroban, bivalirudin, and fondaparinux). This review will compare and contrast the multitargeted and targeted anticoagulants and suggest situations in which it may be appropriate to use argatroban, bivalirudin, and fondaparinux. The various agents differ in their pharmacokinetics, requirements for therapeutic drug monitoring, frequency of administration, efficacy, and adverse effects. The targeted anticoagulants have properties that may make them more attractive for use in specific clinical situations. Prospective clinical trial data are presented supporting the current and future use of these agents in children.
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13
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Abstract
Abstract
Thrombotic complications are increasing at a steady and significant rate in children, resulting in the more widespread use of anticoagulation in this population. Anticoagulant drugs in children can be divided into the older multitargeted agents (heparin, low-molecular-weight heparin, and warfarin) and the newer targeted agents (argatroban, bivalirudin, and fondaparinux). This review will compare and contrast the multitargeted and targeted anticoagulants and suggest situations in which it may be appropriate to use argatroban, bivalirudin, and fondaparinux. The various agents differ in their pharmacokinetics, requirements for therapeutic drug monitoring, frequency of administration, efficacy, and adverse effects. The targeted anticoagulants have properties that may make them more attractive for use in specific clinical situations. Prospective clinical trial data are presented supporting the current and future use of these agents in children.
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Abstract
Increasing thrombotic complications in children with complex medication conditions have led to more widespread use of anticoagulants [Raffini et al. in Pediatrics 124(4):1001-8, 2009]. While current guidelines for the management of antithrombotic therapy in neonates and children exist, they are based on low- and very low-quality evidence [Monagle et al. in Chest 141(2 Suppl):e737-801S, 2012]. Despite numerous differences, current anticoagulation practice is largely extrapolated from adult studies. This is sub-optimal, particularly in neonates who have a rapidly evolving hemostatic system. The majority of pediatric patients have underlying medical conditions that may significantly influence drug choice and bleeding risk. This article reviews the use of anticoagulants in children with thrombosis, focusing on practical aspects such as dosing, monitoring, and complications. Low molecular weight heparin has become the preferred anticoagulant in children, although unfractionated heparin and warfarin remain frequently used. Other anticoagulants, including fondaparinux, direct thrombin inhibitors, and the newer target-specific oral anticoagulants are also discussed. Given the many unique challenges surrounding the use of anticoagulants in children, pediatric hospitals should have written practice guidelines as well as experienced providers to care for children with thrombosis. This is an evolving field, and further studies of the use of anticoagulants in neonates and children are greatly needed to help optimize care.
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Ko RH, Michieli C, Lira JL, Young G. FondaKIDS II: Long-term follow-up data of children receiving fondaparinux for treatment of venous thromboembolic events. Thromb Res 2014; 134:643-7. [DOI: 10.1016/j.thromres.2014.07.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 06/09/2014] [Accepted: 07/08/2014] [Indexed: 10/25/2022]
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Abstract
Given the rising incidence of thrombotic complications in paediatric patients, understanding of the pharmacologic behaviour of anticoagulant drugs in children has gained importance. Significant developmental differences between children and adults in the haemostatic system and pharmacologic parameters for individual drugs highlight potentially unique aspects of anticoagulant pharmacology in this special and vulnerable population. This review focuses on pharmacologic information relevant to the dosing of unfractionated heparin, low molecular weight heparin, warfarin, bivalirudin, argatroban and fondaparinux in paediatric patients. The bulk of clinical experience with paediatric anticoagulation rests with the first three of these agents, each of which requires higher bodyweight-based dosing for the youngest patients, compared with adults, in order to achieve comparable pharmacodynamic effects, likely related to an inverse correlation between age and bodyweight-normalized clearance of these drugs. Whether extrapolation of therapeutic ranges targeted for adult patients prescribed these agents is valid for children, however, is unknown and a high priority for future research. Novel oral anticoagulants, such as dabigatran, rivaroxaban and apixaban, hold promise for future use in paediatrics but require further pharmacologic study in infants, children and adolescents.
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17
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Har Ko R, Young G. Pharmacokinetic- and pharmacodynamic-based antithrombotic dosing recommendations in children. Expert Rev Clin Pharmacol 2014; 5:389-96. [DOI: 10.1586/ecp.12.23] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Mateos MK, Wright FA, Cohn RJ. Pharmacokinetic analysis of enoxaparin in a term neonate and review of literature. Thromb Res 2013; 132:487-9. [PMID: 23992876 DOI: 10.1016/j.thromres.2013.06.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 05/13/2013] [Accepted: 06/25/2013] [Indexed: 11/16/2022]
Affiliation(s)
- Marion K Mateos
- Kids Cancer Centre (Department of Pediatric Hematology/Oncology), Sydney Children's Hospital, Randwick, Australia; School of Women and Children's Health, University of New South Wales, Sydney, Australia.
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19
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Hicks JK, Shelton CM, Sahni JK, Christensen ML. Retrospective evaluation of enoxaparin dosing in patients 48 weeks' postmenstrual age or younger in a neonatal intensive care unit. Ann Pharmacother 2012; 46:943-51. [PMID: 22828970 DOI: 10.1345/aph.1r116] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Enoxaparin is the anticoagulant of choice in neonates because of the ease of administration, predictable pharmacokinetics, and reduced adverse effects when compared to heparin. The Chest guidelines recommend that therapy in patients younger than 2 months should be initiated with enoxaparin 1.5 mg/kg administered subcutaneously twice daily. This starting dosage may be inadequate, leading to a delay in achieving therapeutic anti-factor Xa plasma concentrations. OBJECTIVE To determine an enoxaparin dose for neonatal patients that achieves a therapeutic anti-factor Xa plasma concentration and compare that dose to the recommended enoxaparin dose per published guidelines for this patient population. METHODS The study was designed as a single-center chart review. Eligible patients were identified by pharmacy anticoagulation records or a search of the electronic medical record for enoxaparin orders. Patients must have received enoxaparin subcutaneously twice daily and have had a postmenstrual age of 48 weeks or younger. Patients diagnosed with renal failure and those receiving prophylactic doses of enoxaparin were excluded. RESULTS The mean (SD) initial dose of enoxaparin was 1.4 (0.3) mg/kg subcutaneously twice daily, resulting in 27 of 33 patients (81.8%) having a subtherapeutic anti-factor Xa concentration. A mean enoxaparin dose of 2.0 (0.5) mg/kg was required to achieve a therapeutic anti-factor Xa plasma concentration (p < 0.001). Patients born prematurely required a higher enoxaparin dose (2.2 [0.5] mg/kg) than did those born at full-term gestation (1.8 [0.4] mg/kg; p < 0.05). CONCLUSIONS For patients 48 weeks' postmenstrual age or younger who are treated in a neonatal intensive care unit, a higher initial dose of enoxaparin than that suggested by the Chest guidelines is required to attain a therapeutic antifactor Xa plasma concentration. Premature neonates require a larger starting dose of enoxaparin than do infants born at full-term gestation.
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Affiliation(s)
- J Kevin Hicks
- Department of Pharmacy, Le Bonheur Children's Hospital, Memphis, TN, USA.
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20
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Kerlin BA. Current and future management of pediatric venous thromboembolism. Am J Hematol 2012; 87 Suppl 1:S68-74. [PMID: 22367975 DOI: 10.1002/ajh.23131] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 01/17/2012] [Accepted: 01/18/2012] [Indexed: 01/17/2023]
Abstract
Venous thromboembolism (VTE) is an increasingly common complication encountered in tertiary care pediatric settings. The purpose of this review is to summarize the epidemiology, current and emerging pharmacotherapeutic options, and management of this disease. Over 70% of VTE occur in children with chronic diseases. Although they are seen in children of all ages, adolescents are at greatest risk. Pediatric VTE is associated with an increased risk of in-hospital mortality; recurrent VTE and post-thrombotic syndrome are commonly seen in survivors. In recent years, anticoagulation with low molecular weight heparin has emerged as the mainstay of therapy, but compliance is limited by its onerous subcutaneous administration route. New anticoagulants either already approved for use in adults or in the pipeline offer the possibility of improved dose stability and oral routes of administration. Current recommended anticoagulation course durations are derived from very limited case series and cohort data, or extrapolations from adult literature. However, the pathophysiologic underpinnings of pediatric VTE are dissimilar from those seen in adults and are often variable within groups of pediatric patients. Clinical studies and trials in pediatric VTE are underway which will hopefully improve the quality of evidence from which therapeutic guidelines are derived.
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Affiliation(s)
- Bryce A Kerlin
- Division of Hem/Onc/BMT, Nationwide Children's Hospital, Columbus, Ohio, USA.
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Young G, Yee DL, O'Brien SH, Khanna R, Barbour A, Nugent DJ. FondaKIDS: a prospective pharmacokinetic and safety study of fondaparinux in children between 1 and 18 years of age. Pediatr Blood Cancer 2011; 57:1049-54. [PMID: 21319285 DOI: 10.1002/pbc.23011] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Accepted: 12/09/2010] [Indexed: 11/08/2022]
Abstract
BACKGROUND The incidence of thromboembolic disease is increasing in children. New anticoagulants have been licensed in adults and need to be studied in children. This report describes the first prospective study of fondaparinux in children. PROCEDURE The purpose of the study was to determine the dosing, pharmacokinetics, and safety of fondaparinux in children with deep vein thrombosis (DVT) or heparin-induced thrombocytopenia (HIT). Hospitalized children between 1 and 18 years of age with DVT or HIT received fondaparinux 0.1 mg/kg once daily. Fondaparinux-based anti-factor Xa levels were assessed at 2, 4, 12, and 24 hr following the first dose, and peak levels were measured twice weekly thereafter. Detailed pharmacokinetic analyses were performed. RESULTS Twenty four subjects in 3 age cohorts were enrolled and completed the study. Pharmacokinetic modeling demonstrated that a once-daily dose of fondaparinux at 0.1 mg/kg resulted in similar concentrations known to be efficacious in adults. Safety was demonstrated with only two bleeding events: one which may have pre-dated study drug administration and one which led only to temporary discontinuation of study drug. CONCLUSION Dosing of fondaparinux at 0.1 mg/kg once daily in children resulted in PK profiles comparable to those in adults receiving standard dosing. Fondaparinux can be considered an attractive alternative to LMWH given its once-daily dosing, acceptable safety data, and other favorable properties.
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Affiliation(s)
- Guy Young
- Children's Hospital Los Angeles, University of Southern California, Keck School of Medicine, Los Angeles, California 90027, USA.
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Abstract
Thromboembolic complications are becoming more frequent in children and the use of anticoagulation has increased considerably. The most widely used agents in children, heparin, low molecular weight heparin, and warfarin all have limitations which are exaggerated in children. This has led to the study of newer agents with improved pharmacologic properties such as bivalirudin, argatroban, and fondaparinux. Clinical trials are under way to assess several new oral anticoagulants that are in late phase studies or already licensed in adults. Based on the completed studies in children, several recommendations for the use of currently available agents (bivalirudin, argatroban, and fondaparinux) are suggested for clinical use today. Additional studies need to be conducted for the these agents, so that their use may be expanded in selected indications. New regulatory requirements are leading to a number of studies in the newer anticoagulants that are yet to be licensed in adults for treatment of venous thromboembolism. Pediatric thrombosis is entering a fruitful era of research in anticoagulation management, which is sure to lead to significant changes in how children are treated in the next 10 years.
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Affiliation(s)
- Guy Young
- Hemostasis and Thrombosis Center, Children's Hospital Los Angeles, Los Angeles, CA, USA.
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Duffull SB, Wright DFB, Winter HR. Interpreting population pharmacokinetic-pharmacodynamic analyses - a clinical viewpoint. Br J Clin Pharmacol 2011; 71:807-14. [PMID: 21204908 DOI: 10.1111/j.1365-2125.2010.03891.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The population analysis approach is an important tool for clinical pharmacology in aiding the dose individualization of medicines. However, due to their statistical complexity the clinical utility of population analyses is often overlooked. One of the key reasons to conduct a population analysis is to investigate the potential benefits of individualization of drug dosing based on patient characteristics (termed covariate identification). The purpose of this review is to provide a tool to interpret and extract information from publications that describe population analysis. The target audience is those readers who are aware of population analyses but have not conducted the technical aspects of an analysis themselves. Initially we introduce the general framework of population analysis and work through a simple example with visual plots. We then follow-up with specific details on how to interpret population analyses for the purpose of identifying covariates and how to interpret their likely importance for dose individualization.
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Affiliation(s)
- Stephen B Duffull
- School of Pharmacy, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
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Young G. New anticoagulants in children: A review of recent studies and a look to the future. Thromb Res 2011; 127:70-4. [DOI: 10.1016/j.thromres.2010.10.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Revised: 10/18/2010] [Accepted: 10/19/2010] [Indexed: 01/19/2023]
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Trame MN, Mitchell L, Krümpel A, Male C, Hempel G, Nowak-Göttl U. Population pharmacokinetics of enoxaparin in infants, children and adolescents during secondary thromboembolic prophylaxis: a cohort study. J Thromb Haemost 2010; 8:1950-8. [PMID: 20586920 DOI: 10.1111/j.1538-7836.2010.03964.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Enoxaparin has been extensively studied in adults on its safety and efficacy during prevention of symptomatic thromboembolism when acute anticoagulation or secondary prevention is required as a result of venous thrombosis or stroke. In children, it is still used off-label and little is known about the pharmacokinetics in children. OBJECTIVES The aim of the present study was to evaluate whether a once- or twice-daily dosing regimen would be feasible in children to achieve appropriate plasma levels of enoxaparin. PATIENTS/METHODS A population pharmacokinetic model was developed using anti-factor (F)Xa activity data from 126 children (median age: 5.9 years) receiving enoxaparin either as a once- or twice-daily dosing regimen. RESULTS A two-compartment model was adequate for describing the enoxaparin kinetics. Body weight proved to be the most predictive covariate for clearance and central volume of distribution: clearance 15 mL h⁻¹ kg⁻¹, central volume of distribution 169 mL kg⁻¹, intercompartmental clearance 58 mL h⁻¹, peripheral volume of distribution 10 L and absorption rate 0.414 h⁻¹. Interindividual variability was found to be 54% for clearance and 42% for volume of distribution. CONCLUSION The model is capable of describing all age groups and dosing levels of our population and predicts 12 h and 24 h enoxaparin activities sufficiently. According to our results, a once-daily enoxaparin dosing regimen with frequent monitoring is feasible. In 53.2% of the patients the median 24 h trough level was above the desired range of 0.1 IU mL⁻¹ anti-FXa activity for prophylaxis therapy.
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Affiliation(s)
- M N Trame
- Department of Pharmaceutical and Medical Chemistry - Clinical Pharmacy, University of Münster, Münster, Germany.
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Abstract
The number of children receiving anticoagulation is increasing. Thromboembolic events are associated with significant risk of morbidity and mortality although the optimal management of asymptomatic events remains unclear. Specific challenges in paediatrics include the diagnosis of thrombosis, delivery and monitoring of anticoagulation in a wide range of ages from neonates through to adolescents. The development of the haemostatic system as children age results in changing pathophysiology of thrombosis and response to anticoagulation agents. Although registry and observational studies have provided vital information, specific paediatric, prospective anticoagulation studies have been few and limited in design. The result is that much of current practice is extrapolated from adult studies. Traditional anticoagulants have significant limitations. Both heparin and warfarin are in widespread use but many fundamental questions regarding dose, therapeutic range, efficacy and optimum duration have not been fully answered. Alternative agents, such as direct thrombin inhibitors and the selective anti-factor Xa inhibitor fondaparinux, may have advantages for children. Clinical trials in adults and preliminary data in children are promising but caution should be applied until specific paediatric studies have demonstrated safety and efficacy.
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Affiliation(s)
- Jeanette H Payne
- Department of Paediatric Haematology, Sheffield Children's Hospital, Sheffield, UK.
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Do neonates, infants and young children need a higher dose of enoxaparin in the cardiac intensive care unit? Cardiol Young 2010; 20:138-43. [PMID: 20199704 DOI: 10.1017/s1047951109990564] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Thromboembolic events are a serious complication occurring in critically ill children admitted to the cardiac intensive care unit. Although enoxaparin is one of the current anticoagulants of choice, dosages in children are extrapolated from adult guidelines. Recent data suggest that this population may need a higher dose than what is currently recommended to achieve target anti-factor Xa levels. The purpose of this study was to evaluate whether children less than 2 years old admitted to the cardiac intensive care unit require a higher enoxaparin dose than that currently recommended to achieve target anti-factor Xa levels. METHODS Retrospective chart review including patients who received enoxaparin for the treatment or prophylaxis of venous thrombosis between January, 2005 and October, 2007. Patients were classified as younger and older as well as prophylactic and therapeutic on the basis of age and enoxaparin dose, respectively. Younger patients were those 2 month old or less and older patients were those older than 2 months of age. RESULTS A total of 31 patients were identified; 13 (42%) were 2 months or younger and 25 (81%) were postoperative patients. Ten (32%) received prophylactic and 21 (68%) received therapeutic enoxaparin doses. To achieve optimal anti-factor Xa levels, enoxaparin dose was increased in all groups and reached statistical significance in all patients except those older than 2 months who received prophylactic enoxaparin. An average of 2.8 dosage adjustments was needed. No bleeding complications were reported. CONCLUSIONS Young children, infants, and neonates admitted to the cardiac intensive care unit required a significantly higher enoxaparin dose than that currently recommended to achieve target anti-factor Xa levels.
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Ignjatovic V, Najid S, Newall F, Summerhayes R, Monagle P. Dosing and monitoring of enoxaparin (Low molecular weight heparin) therapy in children. Br J Haematol 2010; 149:734-8. [DOI: 10.1111/j.1365-2141.2010.08163.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Rojnuckarin P, Akkawat B, Juntiang J. Stability of Plasma Anti-Xa Activity in Low-Molecular-Weight Heparin Monitoring. Clin Appl Thromb Hemost 2009; 16:313-7. [DOI: 10.1177/1076029609336853] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Low-molecular-weight heparin (LMWH) is now the standard of care for prophylaxis and treatment of thromboembolic disorders. Only cases with renal failure, morbid obesity or extreme age require anti-Xa monitoring to assure the therapeutic level achievement. Because of infrequent requests, the test is usually sent to the reference laboratories and specimen handling may be delayed. Because LMWHs can be kept at ambient temperature for several days, we proposed that anti-Xa levels in plasma samples are similarly steady. Patients’ plasma that was requested for anti-Xa activity was left at room temperature to repeat the test 24 hours later and compare with the result of immediate assay. The study included 86 fresh specimens from 56 participants. All patients received enoxaparin with anti-Xa levels ranging from 0.1 to 2.5 U/mL. Notably, anti-Xa activities significantly rose on the second occasions (P = 8.4 × 10—10). The mean change of anti-Xa was +0.15 ± 0.21 U/mL (+24.9% ± 37.4%). Children (age <15 years) showed more marked alterations than adults (+40.9% vs. +18.2%, P = .008). There was no statistical difference in the degrees of changes between sexes and diagnoses. The data suggest that specimens sent for anti-Xa require prompt handling to prevent falsely elevated values. This observation is new and future research is needed to find the mechanism of this alteration.
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Affiliation(s)
- Ponlapat Rojnuckarin
- Division of Hematology, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand,
| | - Benjaporn Akkawat
- Division of Hematology, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Jumlong Juntiang
- Division of Hematology, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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Current World Literature. Curr Opin Anaesthesiol 2008; 21:523-7. [DOI: 10.1097/aco.0b013e32830d5bc4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
AbstractThromboembolic complications are increasing in children and the use of anticoagulation has seen a dramatic increase despite the lack of randomized clinical trials. The most widely used agents in children are heparin, low-molecular-weight heparins (LMWH), and warfarin. These agents, however, have significant limitations that are exaggerated in children. Novel anticoagulants such as direct thrombin inhibitors and the selective factor Xa inhibitor, fondaparinux, have been approved for use in adults and have properties that suggest they may be safer and more efficacious than the standard agents; however, until recently, publications using these agents in children were limited to case reports. Recently, clinical trials for two direct thrombin inhibitors, bivalirudin and argatroban, have been completed and a clinical trial of fondaparinux is under way. This review will compare the standard agents with the novel agents and briefly review the results of the clinical trials.
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