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Man L, Yount K, Grazioli A, Padmanabhan A, Thiele R, Maitland HS, Mazzeffi M. Recrudescent Heparin-Induced Thrombocytopenia After Therapeutic Plasma Exchange in a Patient Undergoing Thoracic Aortic Replacement. J Cardiothorac Vasc Anesth 2023; 37:2592-2596. [PMID: 37827918 PMCID: PMC10802261 DOI: 10.1053/j.jvca.2023.09.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 08/31/2023] [Accepted: 09/18/2023] [Indexed: 10/14/2023]
Affiliation(s)
- Louise Man
- University of Virginia School of Medicine, Department of Medicine, Division of Hematology and Oncology, Charlottesville, VA
| | - Kenan Yount
- University of Virginia School of Medicine, Department of Surgery, Division of Cardiothoracic Surgery, Charlottesville, VA
| | | | - Anand Padmanabhan
- Mayo Clinic College of Medicine, Department of Pathology, Rochester, MN
| | - Robert Thiele
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Hillary S Maitland
- University of Virginia School of Medicine, Department of Medicine, Division of Hematology and Oncology, Charlottesville, VA
| | - Michael Mazzeffi
- University of Virginia, Department of Anesthesiology, Charlottesville, VA.
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2
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Aguiar de Sousa D, Romoli M, Sánchez Van Kammen M, Heldner MR, Zini A, Coutinho JM, Arnold M, Ferro JM. Cerebral Venous Thrombosis in Patients With Heparin-Induced Thrombocytopenia a Systematic Review. Stroke 2022; 53:1892-1903. [PMID: 35240862 DOI: 10.1161/strokeaha.121.036824] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Cerebral venous thrombosis (CVT) has recently been reported as a common thrombotic manifestation in association with vaccine-induced thrombotic thrombocytopenia, a syndrome that mimics heparin-induced thrombocytopenia (HIT) and occurs after vaccination with adenovirus-based SARS-CoV-2 vaccines. We aimed to systematically review the incidence, clinical features, and prognosis of CVT occurring in patients with HIT. METHODS The study protocol was registered with PROSPERO (CRD42021249652). MEDLINE, EMBASE and Cochrane CENTRAL were searched up to June 1, 2021 for HIT case series including >20 patients, or any report of HIT-related CVT. Demographic, neuroradiological, clinical, and mortality data were retrieved. Meta-analysis of proportions with random-effect modeling was used to derive rate of CVT in HIT and in-hospital mortality. Pooled estimates were compared with those for CVT without HIT and HIT without CVT, to determine differences in mortality. RESULTS From 19073 results, we selected 23 case series of HIT (n=1220) and 27 cases of HIT-related CVT (n=27, 71% female). CVT developed in 1.6% of 1220 patients with HIT (95% CI,1.0%-2.5%, I2=0%). Hemorrhagic brain lesions occurred in 81.8% of cases of HIT-related CVT and other concomitant thrombosis affecting other vascular territory was reported in 47.8% of cases. In-hospital mortality was 33.3%. HIT-related CVT carried a 29% absolute increase in mortality rate compared with historical CVT controls (33.3% versus 4.3%, P<0.001) and a 17.4% excess mortality compared with HIT without CVT (33.3% versus 15.9%, P=0.046). CONCLUSIONS CVT is a rare thrombotic manifestation in patients with HIT. HIT-related CVT has higher rates of intracerebral hemorrhage and a higher mortality risk, when compared with CVT in historical controls. The recently reported high frequency of CVT in patients with vaccine-induced thrombotic thrombocytopenia was not observed in HIT, suggesting that additional pathophysiological mechanisms besides anti-platelet factor-4 antibodies might be involved in vaccine-induced thrombotic thrombocytopenia-related CVT.
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Affiliation(s)
- Diana Aguiar de Sousa
- Department of Neurology, Centro Hospitalar Universitário de Lisboa Norte - Hospital de Santa Maria, Lisbon, Portugal (D.A.d.S., J.M.F.).,Faculdade de Medicina, Universidade de Lisboa, Portugal (D.A.d.S., J.M.F.)
| | - Michele Romoli
- Neurology and Stroke Unit, "Maurizio Bufalini" Hospital, Cesena, Italy (M.R.).,Neurology Clinic, University of Perugia - S. Maria della Misericordia Hospital, Italy (M.R.)
| | - Mayte Sánchez Van Kammen
- Department of Neurology, Amsterdam University Medical Center, the Netherlands (M.S.V.K., J.M.C.)
| | - Mirjam R Heldner
- Department of Neurology, University hospital and University of Bern, Switzerland (M.R.H., M.A.)
| | - Andrea Zini
- IRCCS Istituto delle Scienze Neurologiche di Bologna, Neurologia e Rete Stroke Metropolitana, Ospedale Maggiore, Bologna, Italy (A.Z.)
| | - Jonathan M Coutinho
- Department of Neurology, Amsterdam University Medical Center, the Netherlands (M.S.V.K., J.M.C.)
| | - Marcel Arnold
- Department of Neurology, University hospital and University of Bern, Switzerland (M.R.H., M.A.)
| | - José M Ferro
- Department of Neurology, Centro Hospitalar Universitário de Lisboa Norte - Hospital de Santa Maria, Lisbon, Portugal (D.A.d.S., J.M.F.).,Faculdade de Medicina, Universidade de Lisboa, Portugal (D.A.d.S., J.M.F.)
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3
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Pishko AM. Heparin-induced thrombocytopenia and cardiovascular surgery. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2021; 2021:536-544. [PMID: 34889428 PMCID: PMC8791147 DOI: 10.1182/hematology.2021000289] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Clinicians generally counsel patients with a history of heparin-induced thrombocytopenia (HIT) to avoid heparin products lifelong. Although there are now many alternative (nonheparin) anticoagulants available, heparin avoidance remains challenging for cardiac surgery. Heparin is often preferred in the cardiac surgery setting based on the vast experience with the agent, ease of monitoring, and reversibility. To "clear" a patient with a history of HIT for cardiac surgery, hematologists must first confirm the diagnosis of HIT, which can be challenging due to the ubiquity of heparin exposure and frequency of thrombocytopenia in patients in the cardiac intensive care unit. Next, the "phase of HIT" (acute HIT, subacute HIT A/B, or remote HIT) should be established based on platelet count, immunoassay for antibodies to platelet factor 4/heparin complexes, and a functional assay (eg, serotonin release assay). As long as the HIT functional assay remains positive (acute HIT or subacute HIT A), cardiac surgery should be delayed if possible. If surgery cannot be delayed, an alternative anticoagulant (preferably bivalirudin) may be used. Alternatively, heparin may be used with either preoperative/intraoperative plasma exchange or together with a potent antiplatelet agent. The optimal strategy among these options is not known, and the choice depends on institutional experience and availability of alternative anticoagulants. In the later phases of HIT (subacute HIT B or remote HIT), brief intraoperative exposure to heparin followed by an alternative anticoagulant as needed in the postoperative setting is recommended.
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Affiliation(s)
- Allyson M. Pishko
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
- Correspondence Allyson M. Pishko, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, 3400 Spruce St, 3rd Floor Dulles, Philadelphia, PA 19104; e-mail:
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Very preterm birth results in later lower platelet activation markers. Pediatr Res 2021; 89:1278-1282. [PMID: 32698194 DOI: 10.1038/s41390-020-1070-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/12/2020] [Accepted: 07/09/2020] [Indexed: 11/08/2022]
Abstract
BACKGROUND Premature birth entails an adverse cardiovascular risk profile, but the underlying mechanisms are insufficiently understood. Here, we employed an unbiased cardiovascular proteomics approach to profile former very preterm-born preschoolers. METHODS This observational study investigated differences in plasma concentrations of 79 proteins, including putative cardiovascular biomarkers between very preterm- and term-born children on average 5.5 years old (53.1% male) using multiple-reaction monitoring mass spectrometry. RESULTS Very preterm-born (n = 38; median gestational age 29.6 weeks) compared to term-born (n = 26; 40.2 weeks) children featured lower plasma concentrations of platelet factor 4 (PLF4; -61.6%, P < 0.0001), platelet basic protein (CXCL7; -57.8%, P < 0.0001), and hemoglobin subunit beta (-48.3%, P < 0.0001). Results remained virtually unchanged when adjusting for complete blood count parameters, including platelet count. Conversely, whole blood hemoglobin was higher (+7.62%, P < 0.0001) in preterm-born children. CONCLUSIONS Very preterm birth was associated with decreased markers of platelet activation among preschoolers. These findings are consistent with reduced platelet reactivity persisting from very preterm birth to a preschool age. IMPACT Former very preterm-born preschoolers featured reduced levels of platelet activation markers. While lower platelet reactivity in very preterm-born compared to term-born infants in the first days of life was established, it was unknown when, if at all, reactivity normalizes. The current study suggests that platelet hyporeactivity due to very preterm birth persists at least up to a preschool age. "Immaturity of the hemostatic system" may be a persistent sequel of preterm birth, but larger studies are needed to investigate its potential clinical implications.
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Squiccimarro E, Jiritano F, Serraino GF, ten Cate H, Paparella D, Lorusso R. Quantitative and Qualitative Platelet Derangements in Cardiac Surgery and Extracorporeal Life Support. J Clin Med 2021; 10:jcm10040615. [PMID: 33561947 PMCID: PMC7914426 DOI: 10.3390/jcm10040615] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/30/2021] [Accepted: 02/03/2021] [Indexed: 01/19/2023] Open
Abstract
Thrombocytopenia and impaired platelet function are known as intrinsic drawbacks of cardiac surgery and extracorporeal life supports (ECLS). A number of different factors influence platelet count and function including the inflammatory response to a cardiopulmonary bypass (CPB) or to ECLS, hemodilution, hypothermia, mechanical damage and preoperative treatment with platelet-inhibiting agents. Moreover, although underestimated, heparin-induced thrombocytopenia is still a hiccup in the perioperative management of cardiac surgical and, above all, ECLS patients. Moreover, recent investigations have highlighted how platelet disorders also affect patients undergoing biological prosthesis implantation. Though many hypotheses have been suggested, the mechanism underlying thrombocytopenia and platelet disorders is still to be cleared. This narrative review aims to offer clinicians a summary of their major causes in the cardiac surgery setting.
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Affiliation(s)
- Enrico Squiccimarro
- Department of Cardiac Surgery, Mater Dei Hospital, 70125 Bari, Italy;
- Department of Emergency and Organ Transplant (DETO), University of Bari, 70125 Bari, Italy
- Cardio-Thoracic Surgery Department, Heart & Vascular Centre, Maastricht University Medical Centre (MUMC), 6229HX Maastricht, The Netherlands;
| | - Federica Jiritano
- Cardio-Thoracic Surgery Department, Heart & Vascular Centre, Maastricht University Medical Centre (MUMC), 6229HX Maastricht, The Netherlands;
- Cardiac Surgery Unit, Department of Experimental and Clinical Medicine, University “Magna Graecia” of Catanzaro, 88100 Catanzaro, Italy;
- Correspondence:
| | - Giuseppe Filiberto Serraino
- Cardiac Surgery Unit, Department of Experimental and Clinical Medicine, University “Magna Graecia” of Catanzaro, 88100 Catanzaro, Italy;
| | - Hugo ten Cate
- Center for Thrombosis and Hemostasis (CTH), University Medical Center of the Johannes Gutenberg-University Mainz, D-55131 Mainz, Germany;
- Thrombosis Center Maastricht, Maastricht University Medical Center (MUMC), 6229HX Maastricht, The Netherlands
- Cardiovascular Research Institute Maastricht (CARIM), 6229HX Maastricht, The Netherlands
| | - Domenico Paparella
- Division of Cardiac Surgery, Santa Maria Hospital, GVM Care & Research, 70125 Bari, Italy;
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy
| | - Roberto Lorusso
- Cardio-Thoracic Surgery Department, Heart & Vascular Centre, Maastricht University Medical Centre (MUMC), 6229HX Maastricht, The Netherlands;
- Cardiovascular Research Institute Maastricht (CARIM), 6229HX Maastricht, The Netherlands
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Zapata D, Binongo J, Lasanajak Y, Wei J, Leshnower BG, Chen EP, Miller JS, Lattouf OM, Guyton RA, Halkos ME, Keeling B. Heparin-Induced Thrombocytopenia in Patients Undergoing Valvular and Aortic Surgery: A Modern Assessment of Risk. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2020; 15:229-234. [DOI: 10.1177/1556984520909799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Objective The incidence and outcomes of patients with heparin-induced thrombocytopenia (HIT) are well defined for general cardiac surgical populations. The purpose of this study was to define the outcomes of patients with HIT in a population excluding patients who underwent coronary artery bypass grafting (CABG). Methods The local Society of Thoracic Surgeons cardiac surgical database was queried between January 2008 and May 2017 for patients who underwent either open valvular surgery or aortic surgery. Patients who underwent either isolated or combined CABG procedures were excluded. Cohorts were formed based on the presence or absence of postoperative HIT. Logistic regression models were built to determine the association between postoperative HIT and outcomes, adjusted for both preoperative and intraoperative variables. Results Of the total cohort (8,107 patients), 176 patients (2.2%) developed HIT after surgery. HIT patients experienced an increased incidence of morbidities postoperatively, including reoperation for bleeding, reoperation for cardiac and noncardiac etiologies, postoperative stroke, perioperative myocardial infarction, postoperative sternal infection, postoperative arrhythmia, new-onset renal failure, and dialysis (all with P < 0.01). The unadjusted 30-day mortality was 14.8% in HIT patients vs 4.9% in those without HIT ( P < 0.01). After risk adjustment, reoperation for noncardiac events, renal failure, new dialysis, postoperative stroke, arrhythmia, and sternal wound infection remained significantly elevated in patients who developed postoperative HIT. Conclusions Patients who developed HIT after non-CABG cardiac surgery experienced increased postoperative rates of morbidity and mortality. Early diagnosis and treatment remained mainstays of therapy. Early identification of patients at highest risk should prompt careful risk stratification when possible.
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Affiliation(s)
- David Zapata
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Jose Binongo
- Department of Biostatistics, Rollins School of Public Health, Emory University School of Medicine, Atlanta, GA, USA
| | - Yi Lasanajak
- Department of Biostatistics, Rollins School of Public Health, Emory University School of Medicine, Atlanta, GA, USA
| | - Jane Wei
- Department of Biostatistics, Rollins School of Public Health, Emory University School of Medicine, Atlanta, GA, USA
| | - Bradley G. Leshnower
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Edward P. Chen
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Jeffrey S. Miller
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Omar M. Lattouf
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Robert A. Guyton
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Michael E. Halkos
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
| | - Brent Keeling
- Clinical Research Unit, Division of Cardiothoracic Surgery, Joseph B. Whitehead Department of Surgery, Emory University School of Medicine, Atlanta, GA, USA
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Hogan M, Berger JS. Heparin-induced thrombocytopenia (HIT): Review of incidence, diagnosis, and management. Vasc Med 2020; 25:160-173. [PMID: 32195628 DOI: 10.1177/1358863x19898253] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Heparin-induced thrombocytopenia (HIT) is a life and limb-threatening complication of heparin exposure. Here, we review the pathogenesis, incidence, diagnosis, and management of HIT. The first step in thwarting devastating complications from this entity is to maintain a high index of clinical suspicion, followed by an accurate clinical scoring assessment using the 4Ts. Next, appropriate stepwise laboratory testing must be undertaken in order to rule out HIT or establish the diagnosis. In the interim, all heparin must be stopped immediately, and the patient administered alternative anticoagulation. Here we review alternative anticoagulation choice, therapy alternatives in the difficult-to-manage patient with HIT, and the problem of overdiagnosis.
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Affiliation(s)
- Marie Hogan
- Department of Pediatrics, Division of Hematology Oncology, Oregon Health & Science University, Portland, OR, USA
| | - Jeffrey S Berger
- Department of Medicine, Division of Cardiology and Hematology, New York University School of Medicine, New York, NY, USA
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Skeith L. Anticoagulating patients with high-risk acquired thrombophilias. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2018; 2018:439-449. [PMID: 30504344 PMCID: PMC6246016 DOI: 10.1182/asheducation-2018.1.439] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Antiphospholipid syndrome (APS), heparin-induced thrombocytopenia, and paroxysmal nocturnal hemoglobinuria are 3 acquired thrombophilias that carry a high risk of venous and arterial thromboembolism. Management of these conditions has largely included anticoagulation with a vitamin K antagonist after an initial period of a parenteral anticoagulant, for as long as the thrombotic risk is still present. The available evidence for the use of direct oral anticoagulants (DOACs) is limited and primarily consists of case series and cohort studies, which are summarized in this chapter. Randomized trials evaluating DOACs in patients with APS are reviewed. Further research is needed prior to widely adopting DOACs for use in these high-risk acquired thrombophilias; however, there may be selected low-risk subgroups where DOAC use is possible after careful consideration and patient discussion.
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Affiliation(s)
- Leslie Skeith
- Division of Hematology and Hematological Malignancies, Departments of Medicine and Community Health Sciences, University of Calgary, Calgary, Canada; and Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Canada
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9
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Anticoagulating patients with high-risk acquired thrombophilias. Blood 2018; 132:2219-2229. [DOI: 10.1182/blood-2018-05-848697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 08/07/2018] [Indexed: 01/19/2023] Open
Abstract
Abstract
Antiphospholipid syndrome (APS), heparin-induced thrombocytopenia, and paroxysmal nocturnal hemoglobinuria are 3 acquired thrombophilias that carry a high risk of venous and arterial thromboembolism. Management of these conditions has largely included anticoagulation with a vitamin K antagonist after an initial period of a parenteral anticoagulant, for as long as the thrombotic risk is still present. The available evidence for the use of direct oral anticoagulants (DOACs) is limited and primarily consists of case series and cohort studies, which are summarized in this chapter. Randomized trials evaluating DOACs in patients with APS are reviewed. Further research is needed prior to widely adopting DOACs for use in these high-risk acquired thrombophilias; however, there may be selected low-risk subgroups where DOAC use is possible after careful consideration and patient discussion.
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Mattioli AV, Manenti A, Farinetti A. Bacteremia in cardiac surgery patients with heparin-induced thrombocytopenia. Clin Cardiol 2018; 41:1527. [PMID: 30251404 DOI: 10.1002/clc.23081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 09/06/2018] [Indexed: 11/07/2022] Open
Affiliation(s)
- Anna Vittoria Mattioli
- Department of Surgical, Medical and Dental Department of Morphological Sciences related to Transplant Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Antonio Manenti
- Department of Surgical, Medical and Dental Department of Morphological Sciences related to Transplant Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Alberto Farinetti
- Department of Surgical, Medical and Dental Department of Morphological Sciences related to Transplant Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy
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Maharaj S, Chang S, Seegobin K, Morales J, Aysola A, Rana F, Shaikh M. Temporality of heparin-induced antibodies: a retrospective study in outpatients undergoing hemodialysis on unfractionated heparin. Exp Hematol Oncol 2018; 7:23. [PMID: 30221035 PMCID: PMC6137914 DOI: 10.1186/s40164-018-0115-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/06/2018] [Indexed: 01/27/2023] Open
Abstract
Background Heparin-induced antibodies (HIA) are responsible for causing heparin-induced thrombocytopenia and thrombosis. Research has shown that the temporality of heparin-induced antibodies does not follow the classic immunologic response. The immunobiology of HIA generation remains unclear with varying in vitro and in vivo data. Outpatients undergoing hemodialysis (HD) are exposed to heparin chronically. The HIA immune response can therefore be investigated in vivo in this population. Methods We examined the time between the start of HD using unfractionated heparin and HIA levels in 212 outpatients during a 6-year period. Antibodies were detected on enzyme-linked immunosorbent assay. HIA levels were analyzed to determine significance of the trend over time. HIA subgroups were also analyzed for correlation with subsequent thrombotic events and platelet count during follow up. Results Overall, the HIA response in HD was found to peak early with waning antibody response despite continued exposure to heparin. The peak prevalence of a strong immune response (optical density > 1.000) was early and short lived, while weaker immune response (optical density 0.400–1.000) persisted for the first 6 months then declined. The mean follow-up time per patient was 2.3 ± 1.4 years. Despite circulating HIA, including high titers, no patients developed HIT in this sample. There was no association between HIA and thrombocytopenia. There was increased incidence of thrombosis in patients with strong HIA compared to other groups, but this did not achieve statistical significance. Conclusions The data suggest a significant temporal pattern of HIA in outpatients undergoing HD using unfractionated heparin. Positive HIA was not found to be significantly associated with thrombocytopenia or thrombosis risk in these patients. However, while not achieving statistical significance, subsequent thrombotic events occurred most frequently in the strong positive HIA group (optical density > 1.000). Further research into HIA and risk of thrombosis in this population is needed.
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Affiliation(s)
- Satish Maharaj
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
| | - Simone Chang
- 2University of Miami Health System, Miami, FL USA
| | - Karan Seegobin
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
| | - James Morales
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
| | - Agnes Aysola
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
| | - Fauzia Rana
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
| | - Marwan Shaikh
- 1Division of Hematology and Medical Oncology, Department of Internal Medicine, University of Florida College of Medicine-Jacksonville, UF Health Jacksonville, 653 W 8th St, Jacksonville, FL 32209 USA
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Impact of obesity on heparin-induced thrombocytopenia in cardiac surgery patients. Blood Coagul Fibrinolysis 2018; 29:661. [PMID: 30024426 DOI: 10.1097/mbc.0000000000000766] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- Anna Vittoria Mattioli
- Department of Surgical, Medical and Dental, Department of Morphological Sciences related to Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del pozzo, 71 41100, Modena, Italy.
| | - Antonio Manenti
- Department of Surgical, Medical and Dental, Department of Morphological Sciences related to Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del pozzo, 71 41100, Modena, Italy
| | - Alberto Farinetti
- Department of Surgical, Medical and Dental, Department of Morphological Sciences related to Transplant, Oncology and Regenerative Medicine, University of Modena and Reggio Emilia, Via del pozzo, 71 41100, Modena, Italy
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Selleng S, Selleng K. Heparin-induced thrombocytopenia in cardiac surgery and critically ill patients. Thromb Haemost 2017; 116:843-851. [DOI: 10.1160/th16-03-0230] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/16/2016] [Indexed: 11/05/2022]
Abstract
SummaryThrombocytopenia as well as anti-platelet factor 4/heparin (PF4/H) antibodies are common in cardiac surgery patients and those treated in the intensive care unit. In contrast, heparin-induced thrombocytopenia (HIT) is uncommon in these populations (∼1 % and ∼0.5 %, respectively). A stepwise approach where testing for anti-PF4/H antibodies is performed only in patients with typical clinical symptoms of HIT improves diagnostic specificity of the laboratory assays without losing sensitivity, thereby helping to avoid overdiagnosis and resulting HIT overtreatment. Short-term re-exposure to heparin, especially given intraoperatively for cardiovascular surgery, is a reasonable therapeutic option in patients with a history of HIT who subsequently test negative for HIT antibodies. Organ failure(s), enhanced bleeding risks, and other characteristics require special considerations regarding non-heparin anticoagulation: Argatroban is the alternative anticoagulant with pharmacokinetics independent of renal function, but it has a prolonged half-life in case of impaired liver function. For bivalirudin, protocols during cardiopulmonary bypass surgery are established, and it is suitable for patients with liver insufficiency. A major issue of direct thrombin inhibitors are false high activated partial thromboplastin time values in patients with comorbidities affecting prothrombin, which can result in systematic underdosing of the drugs. This is not the case for danaparoid and fondaparinux, which can be monitored by anti-factor Xa assays, but have long half-lives and no suitable antidote. This review includes also information on management of on- and off-pump cardiac surgery, ventricular assist devices, percutaneous interventions, continuous renal replacement therapy, and extracorporeal membrane oxygenation in patients with HIT.
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Pishko AM, Cuker A. Heparin-Induced Thrombocytopenia in Cardiac Surgery Patients. Semin Thromb Hemost 2017; 43:691-698. [PMID: 28597462 DOI: 10.1055/s-0037-1602664] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Allyson M Pishko
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Adam Cuker
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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Abstract
Heparin-induced thrombocytopenia (HIT) is an immune complication of heparin therapy caused by antibodies to complexes of platelet factor 4 (PF4) and heparin. Pathogenic antibodies to PF4/heparin bind and activate cellular FcγRIIA on platelets and monocytes to propagate a hypercoagulable state culminating in life-threatening thrombosis. It is now recognized that anti-PF4/heparin antibodies develop commonly after heparin exposure, but only a subset of sensitized patients progress to life-threatening complications of thrombocytopenia and thrombosis. Recent scientific developments have clarified mechanisms underlying PF4/heparin immunogenicity, disease susceptibility, and clinical manifestations of disease. Insights from clinical and laboratory findings have also been recently harnessed for disease prevention. This review will summarize our current understanding of HIT by reviewing pathogenesis, essential clinical and laboratory features, and management.
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Choxi AA, Patel PA, Augoustides JG, Benitez-Lopez J, Gutsche JT, Murad H, Rodriguez-Blanco YF, Fabbro M, Crookston KP, Gerstein NS. Bivalirudin for Cardiopulmonary Bypass in the Setting of Heparin-Induced Thrombocytopenia and Combined Heart and Kidney Transplantation—Diagnostic and Therapeutic Challenges. J Cardiothorac Vasc Anesth 2017; 31:354-364. [DOI: 10.1053/j.jvca.2016.07.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Indexed: 12/25/2022]
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Welsby IJ, Krakow EF, Heit JA, Williams EC, Arepally GM, Bar-Yosef S, Kong DF, Martinelli S, Dhakal I, Liu WW, Krischer J, Ortel TL. The association of anti-platelet factor 4/heparin antibodies with early and delayed thromboembolism after cardiac surgery. J Thromb Haemost 2017; 15:57-65. [PMID: 27714919 PMCID: PMC5280211 DOI: 10.1111/jth.13533] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Indexed: 12/18/2022]
Abstract
Essentials We evaluated antibody status, thromboembolism and survival after cardiac surgery. Positive antibody tests are common - over 50% are seropositive at 30 days. Seropositivity did not increase thromboembolism or impair survival after cardiac surgery. Results show heparin induced thrombocytopenia antibody screening after surgery is not warranted. SUMMARY Background Heparin-induced thrombocytopenia (HIT) is a prothrombotic response to heparin therapy with platelet-activating, anti-platelet factor 4 (PF4)/heparin antibodies leading to thrombocytopenia associated with thromboembolism. Objective We tested the hypothesis that anti-PF4/heparin antibodies are associated with thromboembolism after cardiac surgery. Methods This multicenter, prospective cohort study collected laboratory and clinical data up to 30 days after surgery and longer-term clinical follow-up data. The primary outcome variable combined new arterial or venous thromboembolic complications (TECs) with all-cause death until 90 days after surgery. Laboratory analyses included platelet counts and anti-PF4/heparin antibody titers (GTI ELISA), with a confirmatory excess heparin step and serotonin release assay. Chi-square testing was used to test the relationship between our outcome and HIT antibody seropositivity. Results Initially, 1021 patients were enrolled between August 2006 and May 2009, and follow-up was completed in December 2014. Seropositivity defined by OD > 0.4 was common, being almost 20% preoperatively, > 30% by discharge, and > 60% by day 30. Death (1.7% within 30 days) or TECs (69 in total) were more likely if the partient was seronegative (OD < 0.4), but positivity defined by OD > 1.0 or including an excess heparin confirmatory step resulted in equal incidence of death or TECs, whether the patient was seronegative or seropositive. Incorporating the serotonin release assay for platelet-activating antibodies did not alter these findings. Conclusions Seropositivity for anti-PF4/heparin antibodies does not increase the risk of death or thromboembolism after cardiac surgery. Screening is not indicated, and seropositivity should only be interpreted in the context of clinical evidence for HIT. TRIAL REGISTRATION Duke IRB Protocol #00010736.
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Affiliation(s)
- I J Welsby
- Department of Anesthesiology and Critical Care, Durham, NC, USA
| | - E F Krakow
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - J A Heit
- Department of Medicine, Division of Cardiovascular Diseases, Mayo Clinic, Durham, NC, USA
| | - E C Williams
- Department of Medicine, Division of Hematology, University of Wisconsin, Durham, NC, USA
| | - G M Arepally
- Department of Medicine, Division of Hematology, Duke University Medical Center, Durham, NC, USA
| | - S Bar-Yosef
- Department of Anesthesiology, Durham VA Medical Center, Durham, NC, USA
| | - D F Kong
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - S Martinelli
- Department of Anesthesiology, University of North Carolina, Durham, NC, USA
| | - I Dhakal
- Department of Biostatistics & Bioinformatics, Duke University Medical Center, Durham, NC, USA
| | - W W Liu
- Department of Biostatistics & Bioinformatics, Duke University Medical Center, Durham, NC, USA
| | - J Krischer
- Pediatric Epidemiology Center, University of South Florida Morsani College of Medicine, Durham, NC, USA
| | - T L Ortel
- Department of Pathology, Duke University Medical Center, Durham, NC, USA
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Yang Y, Wang C, Jin L, Chen G, Li C, Qi K, Kong D, Wang Y, Song M, Ma L. Effectiveness of and risk associated with aspirin therapy in hemodialysis patients with a background of antiplatelet factor 4/heparin complex antibody detection. Thromb Res 2015; 136:61-8. [PMID: 25936230 DOI: 10.1016/j.thromres.2015.04.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 04/10/2015] [Accepted: 04/18/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND The optimal prevention measures against hemodialysis (HD)-associated complications, including all-cause thrombotic events and death, are unclear. METHODS This prospective study was designed to assess the effect of aspirin on prevention of HD-associated complications. Patients were divided into four groups according to platelet factor-4/heparin-complex (PF4/H) antibody detection and aspirin prescription: Group 1, antibody(-)/aspirin(+); Group 2, antibody(-)/aspirin(-); Group 3, antibody(+)/aspirin(+); and Group 4, antibody(+)/aspirin(-). Adverse events were compared among all four groups. Cox hazard regression was performed to analyze the effects of anti-PF4/H antibody and aspirin on thrombosis and death. RESULTS This study included 648 patients undergoing HD; 142 were positive for anti-PF4/H antibodies, and 229 had received aspirin before enrollment. During the 4-year follow-up period, 138 patients developed thrombosis, and 63 of these events were anti-PF4/H antibody-associated. A total of 112 patients died; 75 died of coronary heart disease (CHD). Group 4 had a significantly higher incidence of total and anti-PF4/H antibody-associated thrombosis events as well as total and CHD-associated death than did the other three groups. Aspirin had a preventive effect against all adverse events in anti-PF4/H antibody-positive patients, but not in antibody-negative patients. Group 1 patients with baseline D-dimer levels of <0.6μg/mL developed more hemorrhagic events than did patients in the other groups. CONCLUSIONS Aspirin prevention of thrombosis and death in patients undergoing HD might require consideration of the anti-PF4/H antibody status. In antibody-positive individuals, taking aspirin could improve the prognosis and therefore might be recommended. In antibody-negative individuals, prevention was minimal and the bleeding risk was obviously increased; thus, aspirin should be avoided or at least require careful evaluation prior to aspirin treatment.
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Affiliation(s)
- Yang Yang
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Chao Wang
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Liping Jin
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Guanglei Chen
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Changchun Li
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Ka Qi
- Hemodialysis Centre, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Deyang Kong
- Hemodialysis Centre, First Affiliated Hospital of Haerbin Medical University, Haerbin, China
| | - Yaping Wang
- Hemodialysis Centre, General Hospital of Beijing Military Region, Beijing, China
| | - Minghui Song
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China
| | - Lu Ma
- Kidney Therapeutic Center of Traditional Chinese and Western Medicine, Beidaihe Sanatorium of Beijing Military Region, Qinhuangdao, China.
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Yang Y, Kong D, Wang C, Chen G, Shan F, Qi K, Ma L. Inhibition of platelet activation could decrease thrombotic events in hemodialysis PF4/H antibody-positive patients. Ren Fail 2014; 36:870-6. [PMID: 24665827 DOI: 10.3109/0886022x.2014.899880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Platelet factor 4/heparin (PF4/H) antibody detection is widely used to evaluate the risk of thrombosis in patients undergoing hemodialysis (HD). Most patients who are PF4/H-antibody-positive can survive thrombosis, but the reason has not been clarified. In addition, no valid preventive methods for thrombosis in patients undergoing HD have been confirmed. METHODS A single-center, semi-randomized controlled study was designed. In total, 157 patients fulfilled the inclusion criteria and participated. Patients were first divided according to PF4/H antibody detection and then subdivided randomly according to different anti-platelet agent descriptions. RESULTS (1) PF4/H antibody-positive patients suffered a significantly higher incidence of thrombosis than those who were antibody-negative; (2) PF4/H antibody-positive patients who survived a thrombosis manifested a significantly longer bleeding time and decreased maximum percentage of platelet aggregation inhibition; (3) aspirin and clopidogrel decreased the incidence of thrombosis in PF4/H antibody-positive patients by inhibiting platelet activation. CONCLUSION The PF4/H antibody was effective for prediction of the risk of thrombosis, except in patients with dysfunctional platelets; aspirin manifested effects similar to clopidogrel in terms of prevention of thromboses in PF4/H antibody-positive patients, but costs much less and is therefore recommended.
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Affiliation(s)
- Yang Yang
- Therapeutic Centre of Kidney Diseases, First Affiliated Hospital of Beidaihe Sanatorium of Beijing Military Region , Qinhuangdao, Hebei Province , P.R. China
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Lee GM, Arepally GM. Diagnosis and management of heparin-induced thrombocytopenia. Hematol Oncol Clin North Am 2013; 27:541-63. [PMID: 23714311 DOI: 10.1016/j.hoc.2013.02.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Heparin-induced thrombocytopenia (HIT) is a prothrombotic disorder caused by antibodies to platelet factor 4/heparin (PF4/H) complexes. It presents with declining platelet counts 5 to 14 days after heparin administration and results in a predisposition to arterial and venous thrombosis. Establishing the diagnosis of HIT can be extremely challenging. It is essential to conduct a thorough clinical evaluation in addition to laboratory testing to confirm the presence of PF4/H antibodies. Multiple clinical algorithms have been developed to aid the clinician in predicting the likelihood of HIT. Once HIT is recognized, an alternative anticoagulant should be initiated to prevent further complications.
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Affiliation(s)
- Grace M Lee
- Division of Hematology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA
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Lee GM, Arepally GM. Heparin-induced thrombocytopenia. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2013; 2013:668-74. [PMID: 24319250 PMCID: PMC4153428 DOI: 10.1182/asheducation-2013.1.668] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Heparin-induced thrombocytopenia (HIT) is a prothrombotic disorder caused by antibodies that recognize complexes of platelet factor 4 (PF4) and heparin. HIT is frequently considered in the differential diagnosis of thrombocytopenia occurring in patients on heparin therapy. HIT is a challenging diagnosis because of routine heparin use in hospitalized patients, the common occurrence of thrombocytopenia, and high rates of anti-PF4/heparin seroconversions in patients treated with heparin. Our diagnostic approach to HIT is presented here, underscoring critical elements of clinical and laboratory evaluation.
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Affiliation(s)
- Grace M. Lee
- Hematology/Oncology Fellow, Division of Hematology, Department of Medicine, DUMC Box 3841, Duke University Medical Center, Room 301 Sands Building, Durham, NC 27710, Phone: 919-668-1550, Fax: 919-684-2420
| | - Gowthami M. Arepally
- Associate Professor, Medicine, Division of Hematology, Department of Medicine, Duke University Medical Center, DUMC Box 3486, Room 301 Sands Building, Durham, NC 27710, Phone: 919-668-1550, Fax: 919-684-2420
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Li P, Chen F, Zhao X, Zheng X, Wu H, Chen S, Qin Y. Occurrence and clinical significance of in-hospital acquired thrombocytopenia in patients undergoing transcatheter device closure for congenital heart defect. Thromb Res 2012; 130:882-8. [PMID: 23026381 DOI: 10.1016/j.thromres.2012.09.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 08/12/2012] [Accepted: 09/03/2012] [Indexed: 11/28/2022]
Abstract
BACKGROUND Acquired thrombocytopenia in patients treated by percutaneous coronary intervention is associated with hemorrhagic complications and prolonged in-hospital stay. This study sought to study the prevalence of thrombocytopenia in patients who underwent transcatheter device closure for congenital heart defect (CHD) and its relationship with clinical consequences. METHODS AND RESULTS 299 patients with CHD who underwent successful transcatheter closure were prospectively studied. Thrombocytopenia developed in 135 (45.2%) patients; n=100 (33.4%) mild (100-150 × 10(9)/L), n=25 (8.4%) moderate (50-100 × 10(9)/L), and n=10 (3.3%) severe (P<50 × 10(9)/L), respectively. From baseline, platelet counts tended to decrease on the 1st day after the procedure and reached a nadir level on the 3rd day, then gradually recovered to baseline values on the 9th day. By multivariate analysis, severe thrombocytopenia developed more frequently in patients who had larger device size (OR 2.755, P=0.000), and residue shunt (OR 2.069, P=0.009). Patients who developed thrombocytopenia, compared with those who did not, had higher in-hospital rates of hemorrhagic complications (11.9% vs. 3.0%, P<0.003), greater requirement for elevating platelet medical treatment or platelet transfusion (4.4% vs. 0, P=0.021), longer hospital stay (median 14 vs. 9 days, P<0.001). Severe thrombocytopenia was an independent predictor of hemorrhagic complications (hazard ratio 8.083, 95% CI 4.021-16.237, P=0.001). Compare with patients without thrombocytopenia, bleeding events were markedly increased (11.9% vs. 3.0%, P=0.003) in those with thrombocytopenia during hospitalization. CONCLUSION The size of occluder and other risk factors are independently associated with thrombocytopenia. Thrombocytopenia provides prognostic information, related to increased bleeding events.
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Affiliation(s)
- Pan Li
- Department of Cardiology, Changhai Hospital, Second Military Medical University, Shanghai, China
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Bergese SD, Minkowitz HS, Arpino PA, Sane DC, Levy JH. Multicenter trial of desirudin for the prophylaxis of thrombosis: an alternative to heparin-based anticoagulation (DESIR-ABLE). Clin Appl Thromb Hemost 2012; 19:418-23. [PMID: 22802554 DOI: 10.1177/1076029612452779] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Desirudin, a subcutaneously (SC) administered direct thrombin inhibitor, is indicated for prevention of venous thromboembolic events (VTEs) after total joint replacement surgery. DESIR-ABLE (multicenter trial of desirudin for the prophylaxis of thrombosis: an alternative to heparin-based anticoagulation) was a multicenter, open-label, single-arm study of hospitalized patients requiring VTE protection designed to extend the safety profile for desirudin to include a broad population of perioperative/critically ill patients. The primary end point was major bleeding. A total of 516 patients undergoing major surgery (378, 73%) or who were medically ill with prolonged immobility (138, 27%) were enrolled at 19 centers and received desirudin 15 mg Q12H. Many patients had high-risk features for bleeding and thrombosis such as thrombocytopenia (<100 x 10(9)/mL, n = 50), severe obesity (body mass index >35, n = 145), and renal impairment (creatinine clearance <60 mL/min, n = 292). There were no major bleeds and no VTE-related deaths in this study. The DESIR-ABLE demonstrated the safety of desirudin in critically ill perioperative and medical patients. Trials in specific surgical or medically ill patients are needed to confirm these findings.
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Frequency of heparin/platelet factor 4-dependent platelet antibodies in patients undergoing angioplasty and stenting for cardiovascular disease and their role for on-clopidogrel platelet reactivity. Clin Res Cardiol 2012; 101:445-52. [PMID: 22234620 DOI: 10.1007/s00392-011-0411-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 12/23/2011] [Indexed: 10/14/2022]
Abstract
BACKGROUND The frequency of heparin-induced platelet antibodies (H/PF4 antibodies) following heparin exposure during percutaneous intervention with stent implantation is unknown. These antibodies may activate platelets and therefore contribute to high on-clopidogrel residual platelet reactivity (HRPR). METHODS We screened 288 patients after angioplasty and stenting for H/PF4 antibodies by an IgG/A/M ELISA. The 44 (15.3%) positive samples were further evaluated for IgG only antibodies, by the particle gel immunoassay (PaGIA), the heparin induced platelet activation assay (HIPA) and MEA. Further, we determined on-treatment platelet reactivity by multiple electrode aggregometry (MEA) in these patients. In vivo platelet activation was assessed by P-selectin expression. RESULTS The prevalence of H/PF4 antibodies in the total patients' cohort was 15.3% (95% CI 11.3-20%) by the IgG/A/M ELISA, 9.4% (95% CI 6.3-13.4%) by the IgG ELISA, 11.5% (95% CI 8-15.7%) by PaGIA, 14.2% (95% CI 10.4-18.8%) by MEA, and 2.4% (95% CI 1-4.9%) by HIPA. On-treatment platelet reactivity was similar between patients without and with H/PF4 antibodies [39 AU (6-110 AU) vs. 41 AU (7-91 AU); P = 0.85]. HRPR was seen in 105 patients (37.5%), and occurred to a similar extent in patients without and with H/PF4 antibodies in all test systems (all P > 0.2). Further, there was no difference of the ELISA optical densities using the IgG/A/M or the IgG only ELISA between patients without or with HRPR (all P > 0.3). There was no significant difference of P-selectin expression between patients without or with H/PF4 antibodies (P = 0.97). Noteworthy, none of the patients who developed H/PF4 antibodies had heparin-induced thrombocytopenia or a thromboembolic event. CONCLUSION H/PF4 antibodies are not rare in patients undergoing angioplasty and stenting. However, these antibodies are not associated with the occurrence of HRPR.
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Avidan MS, Smith JR, Skrupky LP, Hill L, Jacobsohn E, Burnside B, Tymkew H, Eby C, Damiano R, Despotis GJ. The occurrence of antibodies to heparin-platelet factor 4 in cardiac and thoracic surgical patients receiving desirudin or heparin for postoperative venous thrombosis prophylaxis. Thromb Res 2011; 128:524-9. [PMID: 21794899 DOI: 10.1016/j.thromres.2011.05.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 05/19/2011] [Accepted: 05/31/2011] [Indexed: 11/28/2022]
Abstract
INTRODUCTION This randomized, exploratory study compared the incidence of heparin-dependent antibodies associated with subcutaneous (SC) desirudin or heparin given for deep-vein thrombosis prophylaxis following cardiac and thoracic surgery. MATERIALS AND METHODS Adult patients scheduled for elective cardiac or thoracic surgery received desirudin 15 mg SC twice daily or unfractionated heparin 5000 units SC thrice daily. Duration of thrombosis prophylaxis was determined by the treating physician. Primary outcome measure was the incidence of new antibody formation directed against platelet factor 4 (PF4)/heparin complex. Secondary outcomes included bleeding and thrombotic complications. Blood was tested for anti-PF4/heparin antibodies at baseline, after surgery prior to study drug administration, postdrug day (PDD) 2, PDD 7, and at 1 month. Doppler studies were done before discharge. RESULTS Of 120 patients, 61 received desirudin, 59 received heparin. New PF4/heparin antibodies occurred in 10.2% and 13.6% of desirudin- and heparin-treated patients, respectively. Among desirudin patients with no heparin exposure, none (0/36) developed PF4/heparin antibodies versus 17.1% with heparin exposure. Incidence of deep venous thrombosis was 4.9% and 3.4% in the desirudin and heparin groups, respectively. Two heparin-group patients developed pulmonary embolism. Two patients per group had bleeding events; no patients required re-exploration for bleeding complications. Median chest tube output was similar with desirudin (900 mL) and heparin (692 mL) as was blood transfusion requirements of more than 2 units (5/61, desirudin; 2/59 heparin). CONCLUSIONS The incidence of thrombotic events was low in both groups. There were no safety concerns, and desirudin was not associated with anti-PF4/heparin antibodies.
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Affiliation(s)
- Michael S Avidan
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Demma LJ, Winkler AM, Levy JH. A diagnosis of heparin-induced thrombocytopenia with combined clinical and laboratory methods in cardiothoracic surgical intensive care unit patients. Anesth Analg 2011; 113:697-702. [PMID: 21788317 DOI: 10.1213/ane.0b013e3182297031] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
BACKGROUND Diagnosing postoperative heparin-induced thrombocytopenia (HIT) in cardiothoracic surgical patients is complicated because of the profound thrombocytopenia that occurs with cardiopulmonary bypass (CPB). CPB predisposes patients to develop a frequent incidence of antibodies directed against platelet factor 4 (PF4)/heparin complexes and HIT. The sensitivity of readily available antibody immunoassays is high, but specificity is quite low. The use of both a clinical probability score and rapid laboratory immunoassay has been shown to increase specificity, which is of particular importance in the CPB setting. Prompt diagnosis is crucial because cessation of heparin and treatment with alternative anticoagulation can reduce the risk of thromboembolic events. METHODS We retrospectively reviewed records from cardiothoracic surgical patients whose serum was tested with both the serotonin release assay (SRA) and the PF4/heparin immunoassay from January 2007 through December 2010. We assigned a high, intermediate, or low clinical "4Ts" probability score that quantifies thrombocytopenia, timing of platelet decrease, and thrombotic complications in each patient. We then compared the clinical score and the PF4/heparin immunoassay against the "gold standard" diagnostic test, the SRA. RESULTS The sensitivity and specificity for PF4/heparin optical density >0.40 were 100% and 26%, respectively. Sensitivity and specificity for the diagnosis of HIT with a combination of PF4/heparin optical density >0.40 and high/intermediate 4Ts score were 100% and 70%, respectively. The negative predictive value was 100% for low 4Ts score. CONCLUSIONS We demonstrated that the use of the 4Ts clinical score combined with the PF4/heparin immunoassay for HIT diagnosis increases the sensitivity and specificity of HIT testing compared with the PF4/heparin immunoassay alone. Furthermore, with an intermediate 4Ts score and positive PF4/heparin antibody test, a confirmatory platelet activation assay such as the SRA is necessary. Physicians treating patients after cardiothoracic surgery should recognize the need for an antibody test and confirmation with a platelet activation assay with even moderate clinical probability of HIT.
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Affiliation(s)
- Linda J Demma
- Department of Anesthesiology, Emory University, Atlanta, GA, USA
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Selleng S, Malowsky B, Itterman T, Bagemühl J, Wessel A, Wollert HG, Warkentin TE, Greinacher A. Incidence and clinical relevance of anti-platelet factor 4/heparin antibodies before cardiac surgery. Am Heart J 2010; 160:362-9. [PMID: 20691844 DOI: 10.1016/j.ahj.2010.05.026] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Accepted: 05/11/2010] [Indexed: 11/27/2022]
Abstract
BACKGROUND Heparin-induced thrombocytopenia (HIT) is caused by anti-platelet factor 4/heparin (PF4/H) immunoglobulin (Ig) G antibodies, which activate platelets. In some patients, anti-PF4/H antibodies are already detectable before cardiac surgery. Whether preoperative presence of antibodies confers adverse prognosis and which particular antibody classes (IgG, IgA, IgM) might be implicated are unknown. METHODS We prospectively screened 591 patients undergoing cardiopulmonary bypass surgery for heparin-dependent antibodies by PF4/H immunoassay (separately for IgG, IgA, and IgM) and platelet activation test at preoperative baseline and at days 6 and 10. All patients received heparin or low-molecular-weight heparin postsurgery regardless of antibody status and were followed for postoperative complications, frequency of HIT, length of hospital stay, and 30-day mortality. RESULTS Anti-PF4/H antibodies of any class were detected at preoperative baseline in 128 (21.7%) of 591 patients: IgG n = 44 (7.4%), IgA n = 36 (6.1%), and IgM n = 79 (13.4%); some patients had >1 antibody class. Neither IgG nor IgA was a risk factor for any adverse outcome parameter. However, preoperative presence of IgM antibodies was associated with an increased risk for nonthromboembolic complications (all complications combined: hazard ratio 1.73, 95% CI 1.15-2.61) and a longer in-hospital stay (P = .02), but without evidence for increased risk of thrombotic complications or subsequent HIT. CONCLUSIONS Patients with preoperative anti-PF4/H antibodies of IgG and IgA class are not at increased risk for thrombotic or nonthrombotic adverse events, whereas those with baseline anti-PF4/H IgM had an increased risk of nonthrombotic adverse outcomes but not of subsequent HIT or thrombosis. Because IgM antibodies do not cause HIT, they could represent a surrogate marker for other heparin-independent risk factors.
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Abstract
Heparin-induced thrombocytopenia (HIT) is an immune-mediated hypercoagulable disorder caused by antibodies to platelet factor 4 (PF4) and heparin. HIT develops in temporal association with heparin therapy and manifests either as an unexplained thrombocytopenia or thrombocytopenia complicated by thrombosis. The propensity for thrombosis distinguishes HIT from other common drug-induced thrombocytopenias. Diagnosing HIT in hospitalized patients is often challenging because of the frequency of heparin use, occurrence of thrombocytopenia from other causes, and development of asymptomatic PF4/heparin antibodies in patients treated with heparin. This review summarizes our current understanding of the pathogenesis, clinical features, diagnostic criteria, and management approaches in HIT.
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Affiliation(s)
- Gowthami M Arepally
- Division of Hematology, Duke University Medical Center, Durham, North Carolina 27710, USA.
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Current World Literature. Curr Opin Anaesthesiol 2010; 23:116-20. [DOI: 10.1097/aco.0b013e3283357df6] [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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Selleng S, Malowsky B, Strobel U, Wessel A, Ittermann T, Wollert HG, Warkentin TE, Greinacher A. Early-onset and persisting thrombocytopenia in post-cardiac surgery patients is rarely due to heparin-induced thrombocytopenia, even when antibody tests are positive. J Thromb Haemost 2010; 8:30-6. [PMID: 19793190 DOI: 10.1111/j.1538-7836.2009.03626.x] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND The high frequency of thrombocytopenia in post-cardiac surgery patients makes it challenging to diagnose heparin-induced thrombocytopenia (HIT). Two platelet count profiles are reported as indicating possible HIT in these patients: profile 1 describes a platelet count fall that begins between postoperative days 5 and 10, whereas profile 2 denotes early-onset thrombocytopenia that persists beyond day 5. OBJECTIVES To examine how these platelet count profiles correlate with antibody status and HIT post-cardiac surgery. METHODS We prospectively screened 581 cardiac surgery patients for heparin-dependent antibodies by platelet factor 4 (PF4)-heparin immunoassay and platelet-activation test, and performed daily platelet counts (until day 10) with 30-day follow-up. RESULTS All three patients with platelet count profile 1 tested positive for platelet-activating anti-PF4-heparin IgG antibodies [odds ratio (OR) 521.7, 95% confidence interval (CI) 3.9-34,000, P = 0.002], and were judged to have HIT. In contrast, none of 25 patients with early-onset and persisting thrombocytopenia (profile 2) was judged to have HIT, including five patients testing positive for platelet-activating anti-PF4-heparin IgG antibodies. In these patients, the frequency of heparin-dependent antibodies did not differ from that in non-thrombocytopenic controls, either for anti-PF4-heparin IgG (OR 1.7, 95% CI 0.7-4.1, P = 0.31) or for platelet-activating antibodies (OR 1.9, 95% CI 0.6-5.7, P = 0.20). Multivariate analysis revealed that type of cardiac surgery, but not HIT antibody status, predicted early-onset and persisting thrombocytopenia. Together, these findings show that HIT was uncommon in this study population [overall frequency, 3/581 (0.5%), 95% CI 0.1-1.5%]. CONCLUSIONS Thrombocytopenia that begins between 5 and 10 days post-cardiac surgery is highly predictive for HIT. In contrast, early-onset and persisting thrombocytopenia is usually caused by non-HIT factors with coinciding heparin-dependent antibody seroconversion.
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Affiliation(s)
- S Selleng
- Institut für Immunologie und Transfusionsmedizin, Ernst-Moritz-Arndt Universität, Greifswald, Germany
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Plasmapheresis and Heparin Reexposure as a Management Strategy for Cardiac Surgical Patients with Heparin-Induced Thrombocytopenia. Anesth Analg 2010; 110:30-5. [DOI: 10.1213/ane.0b013e3181c3c1cd] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Selleng S, Greinacher A, Ittermann T, Wollert HG. Heparin/PF4 antibodies formation after heparin treatment: temporal aspects and long-term follow-up. Am Heart J 2009; 158:e15. [PMID: 19540379 DOI: 10.1016/j.ahj.2009.05.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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