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Wisniewski A, Norman A, Tsang S, Ricketts R, Sharma R, Suggs J, Vizzini S, Castro B, Raphael J, McNaull P, Gangemi J, Roeser M, Mazzeffi M. Pilot Assessment of Platelet Thrombus Area and Contractile Force in Pediatric Congenital Heart Surgery Patients Using a Microfluidic Device. J Cardiothorac Vasc Anesth 2024; 38:2009-2016. [PMID: 38960807 DOI: 10.1053/j.jvca.2024.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 06/07/2024] [Accepted: 06/12/2024] [Indexed: 07/05/2024]
Abstract
OBJECTIVES This work was designed to evaluate maximum platelet contractile force and thrombus area before and after cardiopulmonary bypass (CPB) in pediatric patients having congenital heart disease (CHD) surgery using a microfluidic device. DESIGN A prospective cohort study was designed. SETTING The work took place at an academic medical center. PARTICIPANTS Twenty pediatric CHD patients ≤8 years of age with expected CPB time >30 minutes were enrolled. INTERVENTIONS None. MEASUREMENTS AND MAIN RESULTS Blood was collected at baseline and post-CPB. Maximum platelet contractile force and thrombus area were evaluated in vitro using a microfluidic device (ATLAS PST). Post-CPB samples were supplemented with recombinant von Willebrand factor (rVWF) to explore the impact on contractile force and thrombus area. At baseline, the maximum thrombus area was 0.06 (0.05, 0.07), and the maximum force was 123.3 nN (68.4, 299.5). Linear mixed-effects regression models showed that the maximum thrombus area was larger post-CPB and post-CPB + rVWF compared with pre-CPB (estimated coefficient [Est] = 0.04, p = 0.002; Est = 0.09, p < 0.001, respectively). The maximum thrombus area was also larger post-CPB + rVWF compared with post-CPB (Est = 0.04, p = 0.001). Force was higher post-CPB + rVWF compared with pre-CPB (Est = 173.32, p = 0.044). CONCLUSIONS In pediatric CHD patients, microfluidic testing demonstrated that platelet thrombus area increased slightly after CPB, while platelet contractile force did not change. In vitro addition of rVWF further increased thrombus area, suggesting augmentation of primary hemostasis. Microfluidic assessment of platelet contractile force and thrombus area in pediatric CHD patients appears feasible and can demonstrate changes after CPB. Further studies are needed to determine its accuracy, clinical utility, and normal values for pediatric patients.
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Affiliation(s)
- Alexander Wisniewski
- University of Virginia, Department of Surgery, Division of Cardiothoracic Surgery, Charlottesville, VA
| | - Anthony Norman
- University of Virginia, Department of Surgery, Division of Cardiothoracic Surgery, Charlottesville, VA
| | - Siny Tsang
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Robert Ricketts
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Ruchik Sharma
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - James Suggs
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Samantha Vizzini
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Barbara Castro
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - Jacob Raphael
- Thomas Jefferson University, Sydney Kimmel College of Medicine, Department of Anesthesiology, Philadelphia, PA
| | - Peggy McNaull
- University of Virginia, Department of Anesthesiology, Charlottesville, VA
| | - James Gangemi
- University of Virginia, Department of Surgery, Division of Cardiothoracic Surgery, Charlottesville, VA
| | - Mark Roeser
- University of Virginia, Department of Surgery, Division of Cardiothoracic Surgery, Charlottesville, VA
| | - Michael Mazzeffi
- University of Virginia, Department of Anesthesiology, Charlottesville, VA.
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van der Ven JPG, Günthel M, van den Bosch E, Kamphuis VP, Blom NA, Breur J, Berger RMF, Bogers AJJC, Koopman L, Ten Harkel ADJ, Christoffels V, Helbing WA. Ventricular function and biomarkers in relation to repair and pulmonary valve replacement for tetralogy of Fallot. Open Heart 2023; 10:openhrt-2022-002238. [PMID: 37024245 PMCID: PMC10083861 DOI: 10.1136/openhrt-2022-002238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 03/09/2023] [Indexed: 04/08/2023] Open
Abstract
OBJECTIVE Cardiac surgery may cause temporarily impaired ventricular performance and myocardial injury. We aim to characterise the response to perioperative injury for patients undergoing repair or pulmonary valve replacement (PVR) for tetralogy of Fallot (ToF). METHODS We enrolled children undergoing ToF repair or PVR from four tertiary centres in a prospective observational study. Assessment-including blood sampling and speckle tracking echocardiography-occurred before surgery (T1), at the first follow-up (T2) and 1 year after the procedures (T3). Ninety-two serum biomarkers were expressed as principal components to reduce multiple statistical testing. RNA Sequencing was performed on right ventricular (RV) outflow tract samples. RESULTS We included 45 patients with ToF repair aged 4.3 (3.4 - 6.5) months and 16 patients with PVR aged 10.4 (7.8 - 12.7) years. Ventricular function following ToF repair showed a fall-and-rise pattern for left ventricular global longitudinal strain (GLS) (-18±4 to -13±4 to -20±2, p < 0.001 for each comparison) and RV GLS (-19±5 to -14±4 to 20±4, p < 0.002 for each comparison). This pattern was not seen for patients undergoing PVR. Serum biomarkers were expressed as three principal components. These phenotypes are related to: (1) surgery type, (2) uncorrected ToF and (3) early postoperative status. Principal component 3 scores were increased at T2. This increase was higher for ToF repair than PVR. The transcriptomes of RV outflow tract tissue are related to patients' sex, rather than ToF-related phenotypes in a subset of the study population. CONCLUSIONS The response to perioperative injury following ToF repair and PVR is characterised by specific functional and immunological responses. However, we did not identify factors relating to (dis)advantageous recovery from perioperative injury. TRIAL REGISTRATION NUMBER Netherlands Trial Register: NL5129.
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Affiliation(s)
- Jelle P G van der Ven
- Netherlands Heart Institute, Utrecht, The Netherlands
- Department of Pediatrics, Division of Pediatric Cardiology, Erasmus MC Sophia Children Hospital, Rotterdam, The Netherlands
| | - Marie Günthel
- Department of Medical Biology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Eva van den Bosch
- Netherlands Heart Institute, Utrecht, The Netherlands
- Department of Pediatrics, Division of Pediatric Cardiology, Erasmus MC Sophia Children Hospital, Rotterdam, The Netherlands
| | - Vivian P Kamphuis
- Netherlands Heart Institute, Utrecht, The Netherlands
- Department of Pediatrics, Division of Pediatric Cardiology, Leiden Univerisity Medical Center, Leiden, The Netherlands
| | - Nicolaas A Blom
- Department of Paediatric Cardiology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Johannes Breur
- Department of Pediatric Cardiology, Wilhelmina Children's Hospital/University Medical Center Utrecht, Utrecht, The Netherlands
| | - Rolf M F Berger
- Department of Pediatric Cardiology, University Medical Center Groningen, Groningen, The Netherlands
| | - Ad J J C Bogers
- Department of Cardiothoracic Surgery, Erasmus MC, Rotterdam, The Netherlands
| | - Laurens Koopman
- Department of Pediatrics, Division of Pediatric Cardiology, Erasmus MC Sophia Children Hospital, Rotterdam, The Netherlands
| | - Arend D J Ten Harkel
- Department of Pediatrics, Division of Pediatric Cardiology, Leiden Univerisity Medical Center, Leiden, The Netherlands
| | | | - Willem A Helbing
- Department of Pediatrics, Division of Pediatric Cardiology, Erasmus MC Sophia Children Hospital, Rotterdam, The Netherlands
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Törnudd M, Ramström S, Kvitting JPE, Alfredsson J, Nyberg L, Björkman E, Berg S. Platelet Function is Preserved After Moderate Cardiopulmonary Bypass Times But Transiently Impaired After Protamine. J Cardiothorac Vasc Anesth 2023:S1053-0770(23)00180-5. [PMID: 37059638 DOI: 10.1053/j.jvca.2023.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/05/2023] [Accepted: 03/08/2023] [Indexed: 04/16/2023]
Abstract
OBJECTIVES Previous studies have described impaired platelet function after cardiopulmonary bypass (CPB). Whether this is still valid in contemporary cardiac surgery is unclear. This study aimed to quantify changes in function and number of platelets during CPB in a present-day cardiac surgery cohort. DESIGN Prospective, controlled clinical study. SETTING A single-center university hospital. PARTICIPANTS Thirty-nine patients scheduled for coronary artery bypass graft surgery with CPB. INTERVENTIONS Platelet function and numbers were measured at 6 timepoints in 39 patients during and after coronary artery bypass graft surgery; at baseline before anesthesia, at the end of CPB, after protamine administration, at intensive care unit (ICU) arrival, 3 hours after ICU arrival, and on the morning after surgery. MEASUREMENTS AND MAIN RESULTS Platelet function was assessed with impedance aggregometry and flow cytometry. Platelet numbers are expressed as actual concentration and as numbers corrected for dilution using hemoglobin as a reference marker. There was no consistent impairment of platelet function during CPB with either impedance aggregometry or flow cytometry. After protamine administration, a decrease in platelet function was seen with impedance aggregometry and for some markers of activation with flow cytometry. Platelet function was restored 3 hours after arrival in the ICU. During CPB (85.0 ± 21 min), the number of circulating platelets corrected for dilution increased from 1.73 ± 0.42 × 109/g to 1.91 ± 0.51 × 109/g (p < 0.001). CONCLUSIONS During cardiac surgery with moderate CPB times, platelet function was not impaired, and no consumption of circulating platelets could be detected. Administration of protamine transiently affected platelet function.
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Affiliation(s)
- Mattias Törnudd
- Department of Cardiothoracic and Vascular Surgery and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Sofia Ramström
- Department of Clinical Chemistry and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden; Cardiovascular Research Centre, School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - John-Peder Escobar Kvitting
- Department of Cardiothoracic Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Joakim Alfredsson
- Department of Cardiology and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Linnea Nyberg
- Department of Cardiothoracic and Vascular Surgery and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden; Department of Clinical Chemistry and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Erik Björkman
- Department of Cardiothoracic and Vascular Surgery and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden; Department of Clinical Chemistry and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Sören Berg
- Department of Cardiothoracic and Vascular Surgery and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden.
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Lu ZY, Zhu ZY, Yang JX, Zhou YZ, Jiang YZ, Wei W, Wang X, Li SJ. Platelet Aggregation Before Aspirin Initiation in Pediatric Patients With Congenital Heart Disease at High Risk of Thrombosis. Front Cardiovasc Med 2022; 9:813190. [PMID: 35911558 PMCID: PMC9328390 DOI: 10.3389/fcvm.2022.813190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 06/16/2022] [Indexed: 11/24/2022] Open
Abstract
Background Aspirin following unfractionated heparin is the most common anticoagulation strategy for pediatric patients who experienced cardiac surgery at high risk of thrombosis. The platelet aggregation test is the golden method to evaluate the aspirin effect on platelet function. However, the platelet aggregation basal status before postoperative aspirin initiation and the related clinical influencing factors hasn't been investigated systemically in this population. Methods In a prospective cohort of 247 children, arachidonic acid-induced platelet aggregation (PAG-AA) was measured by means of light transmission aggregometry (LTA) before the first dose of aspirin after cardiac surgical procedure and the perioperative variables were also collected. Distribution of this population's PAG-AA basal status was described. Univariate and multivariate logistic regression analysis were performed to identify the main influencing factors of PAG-AA. Results The median time of aspirin administration was 2 (1–27) days after surgery and the corresponding median value of basal PAG-AA was 20.70% (1.28–86.49%), with 67.6% population under 55% and 47.8% population under 20%. Patients undergoing cardiopulmonary bypass (CPB) had a significantly lower basal PAG-AA than those without (30.63 ± 27.35 vs. 57.91 ± 27.58, p = 0.013). While patients whose test done within 3 days after CPB had a significantly lower PAG-AA than those out of 3 days (25.61 ± 25.59 vs. 48.59 ± 26.45, p = 0.001). Univariate analysis implied that the influencing factors of the basal PAG-AA including CPB use, test time point, cyanosis, and platelet count. Multivariate regression analysis indicated that only CPB use, test time point, and platelet count were the main independent influencing factors for the basal PAG-AA. Conclusion The majority of children have impaired basal platelet aggregometry responses before postoperative aspirin initiation. The main influencing factors are CPB use, test time point, and platelet count. To establish the platelet aggregometry baseline prior to commencement of aspirin therapy, testing should be performed 3 days later following the procedure when effect of CPB is basically over.
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Affiliation(s)
- Zhong-Yuan Lu
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Zhi-Yuan Zhu
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Ju-Xian Yang
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Yu-Zi Zhou
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Ya-Zhou Jiang
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Wei Wei
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
| | - Xu Wang
- Pediatric Intensive Care Unit, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
- *Correspondence: Xu Wang
| | - Shou-Jun Li
- Department of Cardiac Surgery, Pediatric Cardiac Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
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Perez MH, Longchamp D, Amiet V, Natterer J, Ferry T, Boegli Y, Mauron S, Dolci M, Plaza-Wuthrich S, Di Bernardo S. Point-of-care HEMOstasis in children with congenital heart disease, the POCHEMO study: Rotational thromboelastometry and impedance aggregometry in children with cyanotic and non-cyanotic congenital heart disease. INTERNATIONAL JOURNAL OF CARDIOLOGY CONGENITAL HEART DISEASE 2022. [DOI: 10.1016/j.ijcchd.2022.100383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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6
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Dieu A, Van Regemorter V, Detaille T, Houtekie L, Eeckhoudt S, Khalifa C, Kahn D, Clement De Clety S, Poncelet A, Momeni M. Combined Use of Rotational Thromboelastometry (Rotem) and Platelet Impedance Aggregometry (Multiplate Analyzer) in Cyanotic and Acyanotic Infants and Children Undergoing Cardiac Surgery With Cardiopulmonary Bypass: Subgroup Analysis of a Randomized Clinical Trial. J Cardiothorac Vasc Anesth 2020; 35:2115-2123. [PMID: 33127287 DOI: 10.1053/j.jvca.2020.09.133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/27/2020] [Accepted: 09/27/2020] [Indexed: 11/11/2022]
Abstract
OBJECTIVES Few studies have investigated the Multiplate platelet function analyzer in pediatrics. The authors evaluated Multiplate combined with Rotem in terms of guiding platelet transfusion after pediatric cardiac surgery with cardiopulmonary bypass (CPB). The authors further compared coagulation parameters between cyanotic and acyanotic patients. DESIGN Subgroup analysis of a randomized clinical trial. SETTING Tertiary hospital. PARTICIPANTS Patients weighing between seven and 15 kg. INTERVENTIONS None. MEASUREMENTS AND MAIN RESULTS Rotem and Multiplate tests were performed (1) after anesthesia induction, (2) upon CPB separation, and (3) upon intensive care unit arrival. Among a total of 59 subjects, 9 patients required platelet transfusion. In multivariate linear regression, analysis EXTEM maximum clot firmness upon CPB separation was associated with the volume of transfused platelets (regression coefficient = -0.348 [95% confidence interval -1.006 to -0.028]; p = 0.039). No such association was found for the Multiplate test. Acyanotic and cyanotic heart disease were present in 32 and 27 children, respectively. There were no significant differences between these two groups in terms of platelet count and function. Postoperative blood loss was significantly higher in the cyanotic group compared with the acyanotic arm (p = 0.015; difference [95% confidence interval -2.40 {-4.20 to -0.60}]). There were no differences between groups regarding transfusion of allogeneic blood products. CONCLUSIONS This study showed that Rotem, but not Multiplate results, were associated with platelet transfusion in pediatric cardiac surgery with no intake of platelet inhibitors. The usefulness of combining these tests in platelet transfusion decision-making needs to be evaluated in larger populations.
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Affiliation(s)
- Audrey Dieu
- Department of Anesthesiology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Victoria Van Regemorter
- Department of Anesthesiology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Thierry Detaille
- Department of Pediatric Intensive Care Unit, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Laurent Houtekie
- Department of Pediatric Intensive Care Unit, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Stéphane Eeckhoudt
- Department of Hematology, Laboratoires des Hôpitaux Universitaires de Bruxelles, Université Libre de Bruxelles, Brussels, Belgium
| | - Céline Khalifa
- Department of Anesthesiology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - David Kahn
- Department of Anesthesiology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Stéphan Clement De Clety
- Department of Pediatric Intensive Care Unit, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Alain Poncelet
- Department of Cardiac Surgery, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Mona Momeni
- Department of Anesthesiology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium.
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Törnudd M, Ramström S, Kvitting JPE, Alfredsson J, Pihl R, Berg S. Protamine stimulates platelet aggregation in vitro with activation of the fibrinogen receptor and alpha-granule release, but impairs secondary activation via ADP and thrombin receptors. Platelets 2020; 32:90-96. [PMID: 31992110 DOI: 10.1080/09537104.2020.1719992] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Heparin and protamine are fundamental in the management of anticoagulation during cardiac surgery. Excess protamine has been associated with increased bleeding. Interaction between protamine and platelet function has been demonstrated but the mechanism remains unclear. We examined the effect of protamine on platelet function in vitro using impedance aggregometry, flow cytometry, and thrombin generation. Platelets were exposed to protamine at final concentrations of 0, 20, 40, and 80 µg/mL, alone or together with adenosine diphosphate (ADP) or thrombin PAR1 receptor-activating peptide (TRAP). We found that in the absence of other activators, protamine (80 µg/mL) increased the proportion of platelets with active fibrinogen receptor (binding of PAC-1) from 3.6% to 97.0% (p < .001) measured with flow cytometry. Impedance aggregometry also increased slightly after exposure to protamine alone. When activated with ADP or TRAP protamine at 80 µg/mL reduced aggregation, from 73.8 ± 29.4 U to 46.9 ± 21.1 U (p < .001) with ADP and from 126.4 ± 16.1 U to 94.9 ± 23.7 U (p < .01) with TRAP. P-selectin exposure (a marker of alpha-granule release) measured by median fluorescence intensity (MFI) increased dose dependently with protamine alone, from 0.76 ± 0.20 (0 µg/mL) to 10.2 ± 3.1 (80 µg/mL), p < .001. Protamine 80 µg/mL by itself resulted in higher MFI (10.16 ± 3.09) than activation with ADP (2.2 ± 0.7, p < .001) or TRAP (5.7 ± 2.6, p < .01) without protamine. When protamine was combined with ADP or TRAP, there was a concentration-dependent increase in the alpha-granule release. In conclusion, protamine interacts with platelets in vitro having both a direct activating effect and impairment of secondary activation of aggregation by other agonists.
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Affiliation(s)
- Mattias Törnudd
- Department of Cardiothoracic and Vascular Surgery and Department of Medical and Health Sciences, Linköping University , Linköping, Sweden
| | - Sofia Ramström
- Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University , Linköping, Sweden.,Cardiovascular Research Centre, School of Medical Sciences, Örebro University , Örebro, Sweden
| | | | - Joakim Alfredsson
- Department of Cardiology and Department of Medical and Health Sciences, Linköping University , Linköping, Sweden
| | - Richard Pihl
- Department of Cardiothoracic and Vascular Surgery and Department of Medical and Health Sciences, Linköping University , Linköping, Sweden.,Department of Clinical Chemistry and Department of Clinical and Experimental Medicine, Linköping University , Linköping, Sweden
| | - Sören Berg
- Department of Cardiothoracic and Vascular Surgery and Department of Medical and Health Sciences, Linköping University , Linköping, Sweden
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Khalaf-Adeli E, Alavi M, Alizadeh-Ghavidel A, Pourfathollah AA. Comparison of standard coagulation testing with thromboelastometry tests in cardiac surgery. J Cardiovasc Thorac Res 2019; 11:300-304. [PMID: 31824611 PMCID: PMC6891038 DOI: 10.15171/jcvtr.2019.48] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 08/26/2019] [Indexed: 01/20/2023] Open
Abstract
Introduction: According to the several evidences, using thromboelastometry as a point of care test can be effective in reduction in blood loss and transfusion requirements in cardiac surgeries. However, there are limited data regarding to the comparison of thromboelastometry and the standard coagulation tests. In this study, we compared thromboelastometry and standard coagulation tests (PT, PTT and fibrinogen level) in patients under combined coronary-valve surgery. Methods: Forty adult patients who were under on-pump combined coronary-valve surgery were included in this study. Thromboelastometry tests Fibtem, Intem, Extem and Heptem), along with standard coagulation tests (PT, PTT and fibrinogen assay) were simultaneously performed in two time points, before and after the pump (pre-CPB and post-CPB, respectively). Results: A total of 80 blood samples were analyzed. There were no significant correlation between PT test and the CT-Extem parameter as well as PTT and CT-Intem parameter either in pre-CPB and post-CPB (P >0.05). On the contrary, fibrinogen level had high correlation with A10-Fibtem and A10-Extem in pre-PCB (P <0.05). 82% of PT and 84% of PTT measurements were outside the reference range, while abnormal CT in Extem and Intem was observed in 17.9%. Conclusion: For management of bleeding, adequate perioperative haemostatic monitoring is indispensable during cardiac surgery. Standard coagulation tests are time consuming and cannot be interchangeably used with thromboelastomety and relying on their results to decide whether blood transfusion is necessary, leads to the inappropriate transfusion.
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Affiliation(s)
- Elham Khalaf-Adeli
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Mostafa Alavi
- Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Alireza Alizadeh-Ghavidel
- Heart Valve Disease Research Center, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Akbar Pourfathollah
- Departments of Immunology, Faculty of Medicine, Tarbiat Modares University of Medical Sciences, Tehran, Iran.,Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
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Point-of-care hemostasis in children with congenital heart disease, the POCHEMO study: baseline reference values of thromboelastometry and impedance aggregometry. Blood Coagul Fibrinolysis 2019; 30:199-204. [PMID: 31157681 DOI: 10.1097/mbc.0000000000000818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
: Viscoelastic tests and impedance aggregometry allow coagulation evaluation at the bedside, but reference values are scarce in pediatrics. The aim of this study was to establish reference values of thromboelastometry and impedance aggregometry for this population and compare it between age groups. This prospective, single-center, observational study evaluates viscoelastic tests and impedance aggregometry in children with congenital heart disease. A total of 204 children were included with a median age of 3.6 years old. We provide references values for this population with median, percentile 2.5 and percentile 97.5. Infants demonstrate for extrinsic activity a shorter coagulation time (52 [49-55] vs. 56 [51-62] s, P = 0.007) and clot formation time (90 [71-118] vs. 113 [93-146] s, P < 0.0001) so as for intrinsic activity a shorter clot formation time (53 [44-69] vs. 75 [59-92] s, P < 0.0001). The maximal clot firmness was significantly stronger in infants for extrinsic (65 [61-69] vs. 59 [54-63] mm, P < 0.0001), intrinsic (68 [64-70] vs. 61 [57-65] mm, P < 0.0001), and fibrinogen (12 [9-16] vs. 10 [8-13] mm, P = 0.02) activities. Platelet aggregation was significantly higher in infants with an amplitude at 6 min of 28 [23-34] vs. 22 [15-27] Ω, P less than 0.0001, a maximum speed of 11 [9-13] vs. 7 [5-10] Ω/min, P less than 0.0001, and an area under the curve of 120 [92-135] vs. 86 [59-112] Ω min, P less than 0.0001. We provided the first reference values for impedance aggregometry and thromboelastometry in children with congenital heart disease. We showed that these infants tend to have accelerated coagulation and stronger clot firmness compared with older children, but this finding may have only minimal relevance when treating a bleeding child. Trial registration number: ClinicalTrials.gov (clinicaltrials.gov/ct2/show/NCT02387944).
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Willems A, Patte P, De Groote F, Van der Linden P. Cyanotic heart disease is an independent predicting factor for fresh frozen plasma and platelet transfusion after cardiac surgery. Transfus Apher Sci 2019; 58:304-309. [PMID: 30904398 DOI: 10.1016/j.transci.2019.03.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 03/04/2019] [Accepted: 03/14/2019] [Indexed: 12/12/2022]
Abstract
OBJECTIVES Cyanotic heart disease is associated with increased risk of bleeding in children undergoing cardiac surgery. We studied if the presence of a cyanotic heart disease was an independent predictive factor for fresh frozen plasma (FFP) and platelets transfusion in these patients. In children with ROTEM measurements, we also tried to characterize the coagulation profile between both groups. DESIGN Retrospective observational study. SETTING Tertiary university hospital; single center. PARTICIPANTS All consecutive children admitted for cardiac surgery with cardiopulmonary bypass (CPB) from January 2006 to December 2014. Patients who received FFP in the CPB priming were excluded. Multivariate logistic regression was used to determine the predictive factors for FFP and platelet transfusions. INTERVENTION none. MEASUREMENTS AND MAIN RESULTS From the 1846 patients included for analysis: 1063 were acyanotic and 783 were cyanotic. The presence of cyanotic heart disease was an independent predicting factor for both FFP (OR: 2.09; 95%CI: 1.44-3.02) and platelets (OR:3.98; 95%CI: 2.28-6.70) transfusion. Cyanotic children exhibited also higher perioperative blood losses [Intraoperative: 31.1 (17.6-50.4) versus 26.7 (14.8-44.7); P < 0.001 and Postoperative: 31.2 (19.1-51.9) versus 16.9 (10.4-26.9); P < 0.001]. Thromboelastometry assays after separation from CPB and heparin reversal revealed more complex coagulation disturbances in cyanotic than acyanotic children. CONCLUSION Children with a cyanotic heart disease are at higher risk of FFP and platelet transfusion after cardiac surgery. Intraoperative monitoring should be used to guide administration of blood and haemostatic product in this population at high risk of postoperative bleeding.
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Affiliation(s)
- Ariane Willems
- Leids Universitair Medisch Centrum, Pediatric Intensive Care Unit, Albinusdreef 2, 2333 ZA Leiden, The Netherlands.
| | - Philippe Patte
- Hôpital Civil Marie Curie, Department of Anesthesiology, Chausée de Bruxelles 140, 6042 Lodelinsart, Belgium
| | - Françoise De Groote
- Hôpital des Enfants Reine Fabiola, Department of Anesthesiology, Avenue J.J. Crocq, 1020 Bruxelles, Belgium
| | - Philippe Van der Linden
- Hôpital des Enfants Reine Fabiola, Department of Anesthesiology, Avenue J.J. Crocq, 1020 Bruxelles, Belgium
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11
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Romlin BS, Söderlund F, Wåhlander H, Hallhagen S, Wessman C, Baghaei F, Jeppsson A. Perioperative monitoring of platelet function in paediatric cardiac surgery by thromboelastometry, or platelet aggregometry? Br J Anaesth 2018; 116:822-8. [PMID: 27199313 DOI: 10.1093/bja/aew053] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/14/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Impaired platelet function increases the risk of bleeding complications in cardiac surgery. Reliable assessment of platelet function can improve treatment. We investigated whether thromboelastometry detects clinically significant preoperative, perioperative, and postoperative adenosine diphosphate (ADP)-dependent platelet dysfunction in paediatric cardiac surgery patients. METHODS Fifty-seven children were included in a single-centre prospective observational study. Clot formation (modified rotational thromboelastometry with heparinase, HEPTEM) and platelet aggregation (multiple electrode aggregometry) were analysed at five time points before, during, and after surgery. The accuracy of thromboelastometric indices of platelet function [maximal clot firmness (MCF) and clot formation time (CFT)] to detect ADP-dependent platelet dysfunction (defined as ADP-induced aggregation ≤30 units) was calculated with receiver operating characteristics analysis, which also identified optimal cut-off levels. Positive and negative predictive values for the identified cut-off levels (CFT≥166 s; MCF≤43 mm) to detect platelet function were determined. RESULTS The MCF and CFT were highly accurate in predicting platelet dysfunction during cardiopulmonary bypass [CPB; area under the aggregation curve 0.89 (95% confidence interval 0.80-0.97) and 0.86 (0.77-0.96), respectively] but not immediately after CPB [0.64 (0.48-0.79) and 0.67 (0.52-0.82), respectively] or on arrival at the intensive care unit [0.53 (0.37-0.69) and 0.60 (0.44-0.77), respectively]. The positive and negative predictive values were acceptable during CPB (87 and 67%, respectively, for MCF≤43 mm; 80 and 100% for CFT≥166 s) but markedly lower after surgery. CONCLUSION In paediatric cardiac surgery, thromboelastometry has acceptable ability to detect ADP-dependent platelet dysfunction during, but not after, CPB.
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Affiliation(s)
- B S Romlin
- Department of Paediatric Anaesthesia and Intensive Care
| | - F Söderlund
- Department of Paediatric Anaesthesia and Intensive Care
| | - H Wåhlander
- Departent of Paediatric Cardiology, Queen Silvia's Children's Hospital, Gothenburg, Sweden
| | - S Hallhagen
- Department of Paediatric Anaesthesia and Intensive Care
| | - C Wessman
- Centre for Applied Biostatistics, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - F Baghaei
- Department of Medicine/Haematology and Coagulation Disorders
| | - A Jeppsson
- Department Cardiothoracic Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Sweden
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12
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Haas T, Cushing MM, Varga S, Gilloz S, Schmugge M. Usefulness of multiple electrode aggregometry as a screening tool for bleeding disorders in a pediatric hospital. Platelets 2018; 30:498-505. [DOI: 10.1080/09537104.2018.1475631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Thorsten Haas
- Department of Anesthesia, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Melissa M. Cushing
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Stephanie Varga
- Department of Anesthesia, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Séverine Gilloz
- Department of Hematology, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Markus Schmugge
- Department of Hematology, University Children’s Hospital Zurich, Zurich, Switzerland
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13
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Perioperative changes in platelet count and function in patients undergoing cardiac surgery. Med J Islam Repub Iran 2017; 31:37. [PMID: 29445666 PMCID: PMC5804419 DOI: 10.14196/mjiri.31.37] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Indexed: 11/18/2022] Open
Abstract
Background: Patients undergoing cardiac surgery are at increased risk of bleeding due to multifactorial coagulopathies. In the present
study, we aimed at investigating the changes in platelet count and function during and after surgery as well as determining the
association of the platelet dysfunction with bleeding and transfusion requirements in these patients.
Methods: A total of 40 adult patients scheduled for elective valve coronary cardiac surgery were included in this prospective observational
study. Changes in platelet count and function with ADP, acid arachidonic, and collagen (light transmission aggregometry)
were analyzed at three time points: before CPB, after CPB, and 24 hours after end of surgery. Postoperative bleeding and intraoperative
transfusion requirements were recorded.
Results: There were a significant reverse correlation between CPB time and ADP-induced aggregation, particularly after CPB and
postoperative AA-induced aggregation. There was not any significant correlation between platelet count and function at all-time
points. Both platelet count and platelet aggregation significantly reduced during CPB. While platelet aggregation increased on postoperative
Day 1, platelet count reduced by about 40% after CPB, and remained at this level postoperatively. Patients with abnormal
ADP-induced aggregation had significant increased postoperative bleeding and transfusion requirements.
Conclusion: The results of this study demonstrate that platelet count and platelet aggregation are reduced during CPB. Our results
emphasized the effect of platelet dysfunction on increased postoperative bleeding and transfusion requirements. Perioperative monitoring
of platelet function can be considered as a bleeding management strategy for implantation of PBM programs.
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14
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Ranucci M, Baryshnikova E. Platelet function in paediatric cardiac surgery. Br J Anaesth 2016; 116:744-6. [PMID: 27199307 DOI: 10.1093/bja/aew108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M Ranucci
- Department of Cardiothoracic-Vascular Anesthesia and ICU, IRCCS Policlinico San Donato, Milan, Italy
| | - E Baryshnikova
- Department of Cardiothoracic-Vascular Anesthesia and ICU, IRCCS Policlinico San Donato, Milan, Italy
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15
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Development of a specific algorithm to guide haemostatic therapy in children undergoing cardiac surgery. Eur J Anaesthesiol 2015; 32:320-9. [DOI: 10.1097/eja.0000000000000179] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Romlin B, Söderlund F, Wåhlander H, Nilsson B, Baghaei F, Jeppsson A. Platelet count and function in paediatric cardiac surgery: a prospective observational study. Br J Anaesth 2014; 113:847-54. [DOI: 10.1093/bja/aeu194] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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17
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Gertler R, Hapfelmeier A, Tassani-Prell P, Wiesner G, Martin K. The effect of cyanosis on perioperative platelet function as measured by multiple electrode aggregometry and postoperative blood loss in neonates and infants undergoing cardiac surgery. Eur J Cardiothorac Surg 2014; 48:301-7. [PMID: 25352660 DOI: 10.1093/ejcts/ezu412] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/03/2014] [Indexed: 01/07/2023] Open
Abstract
OBJECTIVES Platelet dysfunction is one of the major haematological disturbances of cardiopulmonary bypass (CPB). In addition, cyanosis is known to cause further coagulation disturbances. METHODS We prospectively studied 110 children under 1 year of age for the effects of cyanosis on baseline platelet aggregation, the time course of function on cardiopulmonary bypass, the effect on chest tube drainage (CTD) and the transfusion requirements. Using multiple electrode aggregometry (MULTIPLATE™) with the activators adenosine diphosphate (ADP) and thrombin-related activation peptide (TRAP), platelet aggregation was assessed and examined for predictive value. RESULTS Neonates under 30 days of age (n = 51) and infants (n = 59) were separated for analysis. Cyanosis had no significant effect on platelet function during the first 24 h after surgery. Similarly, there was no association to perioperative platelet function, CTD or exposures to blood products. ADP after protamine correlated significantly with the total number of exposures for neonates and infants and CTD at 6 h in the newborn group. Upon intensive care unit admission, ADP values correlated to the total number of exposures to blood products. No other platelet function value was able to clinically predict CTD or subsequent blood transfusion requirements. CONCLUSIONS In our study population, we observed no clinically significant effect of cyanosis on baseline and the perioperative course of platelet function, CTD and the number of exposures to blood products. Therefore, children under 1 year of age do not require a different approach with regard to platelet transfusions, independent of cyanosis. Clinically, platelet function was not a reliable predictor of CTD or blood transfusion requirements.
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Affiliation(s)
- Ralph Gertler
- Institute of Anesthesiology, German Heart Center, Technische Universität, München, Munich, Germany
| | - Alexander Hapfelmeier
- Institute of Medical Statistics and Epidemiology, Klinikum Rechts der Isar, Technische Universität, München, Munich, Germany
| | - Peter Tassani-Prell
- Institute of Anesthesiology, German Heart Center, Technische Universität, München, Munich, Germany
| | - Gunther Wiesner
- Institute of Anesthesiology, German Heart Center, Technische Universität, München, Munich, Germany
| | - Klaus Martin
- Institute of Anesthesiology, German Heart Center, Technische Universität, München, Munich, Germany
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18
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Plasma fibrinogen concentration is correlated with postoperative blood loss in children undergoing cardiac surgery. Eur J Anaesthesiol 2014; 31:317-26. [DOI: 10.1097/eja.0000000000000043] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Bønding Andreasen J, Hvas AM, Ravn HB. Marked changes in platelet count and function following pediatric congenital heart surgery. Paediatr Anaesth 2014; 24:386-92. [PMID: 24471808 DOI: 10.1111/pan.12347] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/11/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND Reduced hemostatic capacity is common following congenital heart surgery using cardiopulmonary bypass (CPB). The etiology is multifactorial with dilutional coagulopathy, as well as platelet adhesion and activation in the CPB circuit and oxygenator. The purpose of the present study was to evaluate platelet count and function in children following CPB. METHODS In a prospective, observational study comprising 40 children, platelet count and function (Multiplate Analyzer(®)) were measured before surgery, immediately after bypass, and on the first postoperative day. Furthermore, conventional coagulation analysis and thromboelastometry (ROTEM(®)) were carried out. RESULTS A significant decrease in platelet count was observed immediately after coming of bypass (P < 0.001) and persisted to the first postoperative day (P = 0.002). Platelet function was reduced immediately after bypass after induction with ADP (P < 0.001) or TRAP (P = 0.03). The duration of CPB correlated significantly with the decrease in platelet count (r = -0.62, P = 0.0001) and reduction in platelet function (r = -0.42-0.63; P < 0.01). Moderate to deep hypothermia during CPB was associated with a decreased platelet function (P = 0.01-0.12), whereas cyanosis or previous heart surgery caused no further changes in platelet function following CPB. CONCLUSION Both platelet count and platelet function were significantly reduced after CPB in children undertaken correctional heart surgery. Duration of CPB and hypothermia was associated with significant changes in platelet function.
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Affiliation(s)
- Jo Bønding Andreasen
- Department of Anaesthesiology and Intensive Care, Aarhus University Hospital, Aarhus N, Denmark
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20
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Faraoni D, Van der Linden P. Factors affecting postoperative blood loss in children undergoing cardiac surgery. J Cardiothorac Surg 2014; 9:32. [PMID: 24512988 PMCID: PMC3924411 DOI: 10.1186/1749-8090-9-32] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 02/05/2014] [Indexed: 11/24/2022] Open
Abstract
We hypothesized that the influence of cyanotic disease on postoperative blood loss is closely related to age in children undergoing cardiac surgery. Here, we demonstrate that the presence of a cyanotic disease is associated with increased postoperative blood loss in children aged 1 to 6 months. Children with cyanotic disease and aged < 1 month who received fresh frozen plasma during cardiopulmonary bypass had less postoperative blood loss and higher maximal clot firmness on FIBTEM than cyanotic children from all other groups. Additional studies are needed to define optimal pathophysiology-based management in children undergoing cardiac surgery.
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Affiliation(s)
- David Faraoni
- Department of Anesthesiology, Centre Hospitalier Universitaire (CHU) Brugmann - Queen Fabiola Children's University Hospital (QFCUH), Free University of Brussels, 15 JJ Crocq Av, 1020, Brussels, Belgium.
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21
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Tang XL, Liu JX, Dong W, Li P, Li L, Lin CR, Zheng YQ, Cong WH, Hou JC. The Cardioprotective Effect of Protocatechuic Acid on Myocardial Ischemia/Reperfusion Injury. J Pharmacol Sci 2014; 125:176-83. [DOI: 10.1254/jphs.13247fp] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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22
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Bolliger D, Dell-Kuster S, Seeberger MD, Tanaka KA, Gregor M, Zenklusen U, Tsakiris DA, Filipovic M. Impact of loss of high-molecular-weight von Willebrand factor multimers on blood loss after aortic valve replacement. Br J Anaesth 2012; 108:754-62. [PMID: 22311365 DOI: 10.1093/bja/aer512] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Severe aortic stenosis is associated with loss of the largest von Willebrand factor (vWF) multimers, which could affect primary haemostasis. We hypothesized that the altered multimer structure with the loss of the largest multimers increases postoperative bleeding in patients undergoing aortic valve replacement. METHODS We prospectively included 60 subjects with severe aortic stenosis. Before and after aortic valve replacement, vWF antigen, activity, and multimer structure were determined and platelet function was measured by impedance aggregometry. Blood loss from mediastinal drainage and the use of blood and haemostatic products were evaluated perioperatively. RESULTS Before operation, the altered multimer structure was present in 48 subjects (80%). Baseline characteristics and laboratory data were similar in all subjects. The median blood loss after 6 h was 250 (105-400) and 145 (85-240) ml in the groups with the altered and normal multimer structures, respectively (P=0.182). After 24 h, the cumulative loss was 495 (270-650) and 375 (310-600) ml in the groups with the altered and normal multimer structures, respectively (P=0.713). Multivariable analysis revealed no significant influence of multimer structure and platelet function on bleeding volumes after 6 and 24 h. After 24 h, there was no obvious difference in vWF antigen, activity, and multimer structure in subjects with and without the altered multimer structure before operation or in subjects with and without perioperative plasma transfusion. CONCLUSIONS The altered vWF multimer structure before operation was not associated with increased bleeding after aortic valve replacement. Our findings might be explained by perioperative release of vWF and rapid recovery of the largest vWF multimers.
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Affiliation(s)
- D Bolliger
- Department of Anaesthesia and Intensive Care Medicine, University Hospital Basel, Basel, Switzerland.
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23
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Lee KR, Verheyden VJE, Mumford AD. Evaluation of multiple electrode aggregometry in whole blood using Multiplate Mini Test cells. Thromb Res 2012; 129:e59-64. [PMID: 22281068 DOI: 10.1016/j.thromres.2011.12.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 11/22/2011] [Accepted: 12/22/2011] [Indexed: 11/19/2022]
Abstract
Multiple electrode aggregometry (MEA) enables rapid platelet function testing in whole blood using 600 μL disposable standard test cells (STC). However, newly available 350 μL mini test cells (MTC) could potentially be advantageous in some clinical settings where sample volume is limiting. In order to evaluate the diagnostic performance of MTC, we have estimated assay imprecision, correlation and agreement between area under curve (AUC) determined using MTC and STC in whole blood from healthy donors and from 119 cardiac surgery patients. Imprecision was similar with ADP, AA and TRAP test reagents using STC and MTC, but was markedly higher with the unvalidated ADR reagent. AUC determined using MTC and STC and the ADP, AA and TRAP reagents correlated strongly although MTC yield consistently lower AUC values reflecting fewer platelets in the smaller test cell. Agreement between AUC from STC and MTC was less strong, probably reflecting a composite effect of imprecision from both assay formats. MTC and STC are equally valid for MEA but AUC values obtained using one test format cannot be directly transformed to the other. Therefore, STC and MTC cannot be used interchangeably and AUC results must be compared to separately determined reference intervals.
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Affiliation(s)
- Kurtis R Lee
- University Hospitals Bristol NHS Foundation Trust, Bristol, BS2 8HW, United Kingdom.
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