Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 575
Filtrar
1.
BJOG ; 130(12): 9-39, 20231101. tab
Artigo em Inglês | BIGG - guias GRADE | ID: biblio-1524823

RESUMO

The purpose of this guideline is to provide guidance on the investigation and care of women and people with recurrent miscarriage.Within this document we use the terms woman and women's health. However, it is important to acknowledge that it is not only women for whom it is necessary to access women's health and reproductive services in order to main-tain their gynaecological health and reproductive wellbeing. Gynaecological and obstetric services and delivery of care must therefore be appropriate, inclusive and sensitive to the needs of those individuals whose gender identity does not align with the sex they were assigned at birth. The term cou-ple is used to describe two individuals trying to conceive, recognising that in some instances these individuals may not be in a relationship. While every effort is made to ensure the RCOG uses inclusive language there are instances where we have been unable to adhere to this, for example where original research is being referenced the language within the publication is used for accuracy.


Assuntos
Humanos , Feminino , Gravidez , Aborto Espontâneo/diagnóstico por imagem , Análise Citogenética , Ameaça de Aborto/prevenção & controle , Antitrombinas/análise , Ultrassonografia , Deficiência de Proteína C , Metilenotetra-Hidrofolato Redutase (NADPH2)/análise
2.
Bull Exp Biol Med ; 169(6): 815-820, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33123918

RESUMO

The effects of sulfated organosolv lignins derived from fir (Abies sibirica) and larch (Larix sibirica) (SLf and SLl; 4-3-7.5% sulfur, median-weight molecular mass 2960-4888 Da), on human blood/plasma clotting, platelet aggregation, and erythrocyte hemolysis were studied in vitro. Antithrombin activities of the samples were below 2 U/mg. Specimens of SLf (sulfur content 6.5, 6.6, and 7.5%, molecular weights 3503, 3487, and 3580 Da, respectively) and SLl (4.3 and 6.3%, 2960 and 3497 Da) in a concentration of 0.01 mg/ml did not prolong the blood clotting time, did not provoke human platelet aggregation, did not destroy erythrocyte membranes, and could be used for construction of drug delivery systems. The SLf sample (6.5%, sulfur, 3503 Da) in concentrations from 0.09 to 1.82 mg/ml did not stimulate platelet aggregation, reduced ADP-induced platelet aggregation, and 2-fold prolonged the blood/plasma clotting time 2-fold in comparison with control and could be used for creation of biomaterial with clot-resistant surface.


Assuntos
Abies/química , Materiais Biocompatíveis/farmacologia , Coagulação Sanguínea/efeitos dos fármacos , Larix/química , Lignina/farmacologia , Difosfato de Adenosina/farmacologia , Antitrombinas/análise , Materiais Biocompatíveis/química , Materiais Biocompatíveis/isolamento & purificação , Plaquetas/citologia , Plaquetas/efeitos dos fármacos , Células Cultivadas , Sistemas de Liberação de Medicamentos/métodos , Eritrócitos/citologia , Eritrócitos/efeitos dos fármacos , Hemólise/efeitos dos fármacos , Humanos , Lignina/química , Lignina/isolamento & purificação , Teste de Materiais , Peso Molecular , Agregação Plaquetária/efeitos dos fármacos , Sulfatos/química , Madeira/química
3.
Clin Appl Thromb Hemost ; 26: 1076029620912827, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32299224

RESUMO

Supernormal antithrombin (AT) activity is rare in patients with sepsis. This study compared mortality rate of patients with sepsis and supernormal AT activity with that of other patients. This retrospective study included patients with sepsis from 42 intensive care units (ICUs) in Japan. Patients were included if their AT activity was measured on ICU admission, and if they did not receive AT concentrate. They were categorized into low, normal, and supernormal with respective AT activity of ≤70%, >70% to ≤100%, and >100%. The primary outcome was hospital in-patient mortality. Nonlinear regression analysis showed that mortality risk gradually increased with AT activity in the supernormal range, but without statistical significance. Survival rate was significantly lower in low (67%) and supernormal (57%) AT groups than in the normal AT group (79%; P < .001 and P = .008, respectively). After adjusting for disease severity and AT activity on day 2, supernormal AT activity was the only independent predictor of mortality. Sepsis with supernormal AT activity associated with high mortality, independent of disease severity, might be a predictor of in-hospital mortality.


Assuntos
Antitrombinas/efeitos adversos , Sepse/complicações , Idoso , Idoso de 80 Anos ou mais , Antitrombinas/análise , Feminino , Mortalidade Hospitalar , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Sepse/mortalidade , Análise de Sobrevida
4.
Artigo em Inglês | MEDLINE | ID: mdl-31973978

RESUMO

In order to develop an affinity HPLC method for screening direct thrombin inhibitors from Traditional Chinese Medicine (TCM), thrombin was immobilized on the glutaraldehyde-modified amino silica gel and was used as thrombin stationary phase. A thrombin affinity column (TAC) was made by packing the thrombin stationary phase into a bare column (2.0 * 1.0 mm, i.d.). The direct thrombin inhibitors could be screened through this TAC column. For the purpose of improvement of the discovery efficiency, a TAC-HPLC-MS/MS system was used to screen thrombin inhibitors from Radix Salviae Miltiorrhiae (RSM), a famous traditional Chinese medicine. After optimization of all the conditions, cryptotanshinone (Cry), dihydrotanshinone I (Dih-I) and tanshinone IIA (Tan-IIA) were screened out and identified as potential active components. The anticoagulant effects of these three compounds were tested by anticoagulant experiments in vitro. Furthermore, the interaction of three compounds with thrombin was studied by molecular docking. The result shows they have the potential to be used as preventive drugs. In short, this method can be used to screen anticoagulant drugs from traditional Chinese medicine, which provides convenience for screening anticoagulant drugs.


Assuntos
Antitrombinas , Cromatografia de Afinidade , Medicamentos de Ervas Chinesas/química , Salvia miltiorrhiza/química , Trombina/metabolismo , Animais , Antitrombinas/análise , Antitrombinas/metabolismo , Testes de Coagulação Sanguínea , Cromatografia de Afinidade/instrumentação , Cromatografia de Afinidade/métodos , Cromatografia Líquida de Alta Pressão/métodos , Masculino , Simulação de Acoplamento Molecular , Coelhos , Espectrometria de Massas em Tandem/métodos , Trombina/química
5.
Anal Chem ; 91(14): 9001-9009, 2019 07 16.
Artigo em Inglês | MEDLINE | ID: mdl-31246426

RESUMO

The development of botanical materials as therapeutic agents involves the meticulous assessment of safety, efficacy, and quality. Compared with small-molecule drugs, quality control of botanical drugs confronts with more significant challenges due to their inherent complexity. Current quality control methods for botanical drugs, either prevailing chemical tests or emerging biological assays, are not able to meet recent demands of multiplexing, sensitivity, and speed. Here, we propose an on-demand strategy based on a direct analysis in real time-mass spectrometry (DART-MS) platform, which is capable of simultaneously analyzing multiple constituents and bioactivities of botanical drugs. Notably, the bioactivities are assessed by a multiple-enzyme assay that adopts cleavable mass spectrometry probes as enzymatic substrates: these probes labeled with a piperazine tag make possible sensitive, multiplexed, and quantitative enzyme activity measurements. The concept is successfully demonstrated via a case study of Danshen (Salvia miltiorrhiza) Injection where simultaneous detection of 34 constituents and inhibitory activities on two target enzymes can be achieved in just minutes. This proof-of-concept application also gives evidence that combining MS-sensitive probes with DART-MS can provide an environmentally friendly, highly sensitive analytical approach for botanical quality control.


Assuntos
Inibidores da Enzima Conversora de Angiotensina/análise , Antitrombinas/análise , Medicamentos de Ervas Chinesas/análise , Espectrometria de Massas/métodos , Salvia miltiorrhiza/química , Ensaios Enzimáticos/métodos , Oligopeptídeos/análise , Oligopeptídeos/química , Peptidil Dipeptidase A/química , Piperazinas/análise , Piperazinas/química , Trombina/antagonistas & inibidores , Trombina/química
6.
Med Clin (Barc) ; 152(7): 249-254, 2019 04 05.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-29523337

RESUMO

BACKGROUND AND OBJECTIVES: Thrombophilia might increase the risk of suffering from obstetric complications by adversely affecting the normal placental vascular function. Our aim was to study the distributions of five thrombosis-associated genetic variants: factor V Leiden, prothrombin G20210A, -675 4G/5G PAI-1, 10034C/T gamma fibrinogen and 7872C/T factor XI and the frequencies of the deficiencies of protein C, S and antithrombin in Argentinian patients with recurrent pregnancy loss (RPL) and, therefore, to analyse their association with the risk and timing of RPL and the risk of suffering other vascular obstetric pathologies. PATIENTS AND METHODS: We performed a case-control study that included 247 patients with idiopathic RPL (cases), 107 fertile controls and 224 subjects from general population (reference group). Cases were stratified according to the gestational time of the losses (early RPL, n = 89; late losses, n = 158; foetal losses, n = 107) and according to the type of vascular obstetric pathologies. RESULTS: No differences were found in the distribution of the genetic variants among RPL group vs. control/reference group (p >.05). Similarly, no differences were observed in their distributions when analysing RPL patients stratified according to gestational times or vascular obstetric pathologies (p >.05), except for the factor V Leiden carriage in patients with foetal growth retardation vs. controls (11.8%, 4/34 vs. 1.9%, 2/107; p = .04) (OR = 7.11 [1.24-40.93], p = .03). CONCLUSIONS: Factor V Leiden might have a significant impact on certain obstetric pathologies such as foetal growth retardation. The genetic variants, 10034C/T gamma fibrinogen and 7872C/T factor XI, associated with thromboembolic disease, would not have an impact on PRE.


Assuntos
Aborto Habitual/genética , Trombofilia/genética , Adulto , Antitrombinas/análise , Argentina , Estudos de Casos e Controles , Estudos de Coortes , Fator V/genética , Fator XI/genética , Feminino , Retardo do Crescimento Fetal/genética , Fibrinogênios Anormais/genética , Genótipo , Idade Gestacional , Humanos , Inibidor 1 de Ativador de Plasminogênio/genética , Gravidez , Deficiência de Proteína C/diagnóstico , Deficiência de Proteína S/diagnóstico , Trombofilia/complicações
7.
Clin Lab ; 64(7): 1317-1321, 2018 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-30146831

RESUMO

BACKGROUND: The validity of laboratory results depends on pre-analytical variables not detected by conventional quality control. Recommendations are for post-centrifugation coagulation samples to remain capped with cappiercing primary tube analysis. Total laboratory automation integrates analytical platforms with potential incompatibilities necessitating changes including pre-analytical uncapping of samples. METHODS: Samples analyzed for Prothrombin Time (PT), activated Partial Thromboplastin Time (aPTT), D-dimers, Antithrombin and Fibrinogen at baseline, and after 60 and 120 minutes were left at ambient temperature, either re-capped or uncapped, in order to simulate changes from baseline that could occur in uncapped samples on an automation track prior to analysis. Changes were compared to the maximal permissible bias. RESULTS: Sample uncapping for up to 120 minutes at ambient temperature post-centrifugation did not result in clinically significant changes in routine coagulation parameters. CONCLUSIONS: Routine coagulation parameters will not change significantly if the primary citrate tubes are uncapped after centrifugation prior to analysis.


Assuntos
Automação Laboratorial/métodos , Testes de Coagulação Sanguínea/métodos , Coagulação Sanguínea , Manejo de Espécimes/métodos , Antitrombinas/análise , Testes de Coagulação Sanguínea/instrumentação , Centrifugação/métodos , Produtos de Degradação da Fibrina e do Fibrinogênio/análise , Fibrinogênio/análise , Humanos , Tempo de Tromboplastina Parcial , Tempo de Protrombina , Controle de Qualidade , Reprodutibilidade dos Testes , Manejo de Espécimes/instrumentação , Temperatura , Fatores de Tempo
8.
Artigo em Inglês | MEDLINE | ID: mdl-30077924

RESUMO

Human antithrombin (hAT) is a major serine protease inhibitor that regulates blood coagulation in human plasma, and it has been applied for the treatment of antithrombin (AT) deficiency and disseminated intravascular coagulation (DIC). In the past, hAT for therapeutic use has been obtained from human plasma; however, hAT can now be sourced from transgenic animals and Chinese hamster ovary (CHO) cells by recombinant technology. The dominant form of hAT in plasma is the α form, which is glycosylated with four oligosaccharides and sialylated at its terminals. However, it would be preferable to remove the poorly sialylated α form of hAT, the minor ß form with unoccupied glycosylation sites, and the inactive forms. Cellufine Sulfate, a heparin-mimic affinity resin made of cellulose and modified with sulfate groups, has an affinity for heparin-binding proteins and can be used in cation exchange chromatography. Based on these properties, the α and ß forms of hAT could be separated and purified depending on the rate of sialylation. Consequently, Cellufine Sulfate was used to enrich the highly sialylated α form with a considerably higher step yield than that obtained using conventional heparin-immobilized resins. Furthermore, subsequent hydrophobic interaction chromatography could eliminate the inactive forms. These results suggested that Cellufine Sulfate was more effective than heparin-immobilized resins in purifying the highly sialylated α form of hAT for therapeutic applications.


Assuntos
Antitrombinas/isolamento & purificação , Cromatografia de Afinidade/métodos , Proteínas Recombinantes/isolamento & purificação , Animais , Antitrombinas/análise , Antitrombinas/metabolismo , Células CHO , Cromatografia Líquida de Alta Pressão , Cricetinae , Cricetulus , Humanos , Polímeros/química , Polímeros/metabolismo , Isoformas de Proteínas/isolamento & purificação , Proteínas Recombinantes/análise , Proteínas Recombinantes/metabolismo
9.
Int J Lab Hematol ; 40(3): 312-319, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29436777

RESUMO

INTRODUCTION: Antithrombin resistance (ATR) is a novel thrombotic risk in abnormal prothrombins. A manual ATR assay using Oxyuranus scutellatus (Ox) venom as a prothrombin activator was established for detecting antithrombin-resistant prothrombin. However, this assay was limited because of Ox snake venom availability and its throughput capacity. Here, we have improved the ATR assay using bovine factors Xa and Va (FXa/Va) as prothrombin activators and have optimised assay conditions for an automated instrument (ACL TOP 500). METHODS: Diluted plasma was incubated with a prothrombin activator mix (phospholipids, CaCl2 , and bovine FXa/Va), followed by inactivation with antithrombin for 10, 20 and 30 minutes. We added a chromogenic substrate S-2238, and assessed changes in absorbance/min at 405 nm. We also adapted assay conditions for ACL TOP 500. RESULTS: Optimum conditions for FXa/Va treatment were 6.25% phospholipids, 5 mM CaCL2 , 0.01 µg/mL FXa and 0.1 µg/mL FVa. ATR assay kinetics with the FXa/Va activator was comparable with that with the Ox activator in heterozygous reconstituted plasma with the recombinant wild-type or antithrombin-resistant prothrombin. Using ACL TOP 500, optimum conditions for the FXa/Va treatment were 10.0% phospholipids, 5 mM CaCl2 , 0.02 µg/mL FXa and 0.2 µg/mL FVa. The automated ATR assay with the FXa/Va activator demonstrated good detectability for antithrombin-resistant prothrombin in plasma from a heterozygous carrier with prothrombin Yukuhashi or Belgrade. CONCLUSION: We optimised the ATR assay with the FXa/Va activator and adapted the assay for ACL TOP 500; the assay showed the ability to clearly detect antithrombin-resistant prothrombin in manual and automated procedures.


Assuntos
Antitrombinas/fisiologia , Técnicas de Laboratório Clínico/métodos , Resistência a Medicamentos , Protrombina/análise , Animais , Antitrombinas/análise , Automação/instrumentação , Técnicas de Laboratório Clínico/instrumentação , Venenos Elapídicos/farmacologia , Fator Va , Fator Xa , Humanos , Protrombina/metabolismo
10.
J Sci Food Agric ; 98(9): 3551-3562, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29315599

RESUMO

BACKGROUND: Raw rhubarb samples that have been subjected to different drying procedures will have different therapeutic effects, possibly due to processing-induced variations in the chemical composition. In the present work, the fresh materials were processed by smoking, sun-drying, shade-drying and oven-drying at low, moderate and high temperatures. To facilitate the selection of a suitable drying method for rhubarb, the quality of rhubarb processed under various drying conditions was evaluated based on the simultaneous determination of multiple bioactive constituents in combination with bioactivity assays. RESULTS: The total concentrations of 12 compounds in smoked rhubarb were higher than the concentrations of the same components in raw rhubarb and rhubarb products processed using other drying techniques. Smoked rhubarb was found to substantially inhibit Na+ /K+ -ATPase and thrombin. In addition, higher content of anthraquinones led to higher Na+ /K+ -ATPase inhibitory activities, and higher gallic acid content increased the antithrombin capacity. CONCLUSION: The results confirmed that post-harvest fresh plant materials, especially roots, were still physiologically active organs that could undergo series of anti-dehydration mechanisms, including the production of related secondary metabolites during the early stages of dehydration. Therefore, the proper design of drying processes could enhance the quality of rhubarb as well as other similar medicinal plants. © 2018 Society of Chemical Industry.


Assuntos
Dessecação/métodos , Manipulação de Alimentos/métodos , Plantas Medicinais/química , Rheum/química , Antraquinonas/análise , Antitrombinas/análise , Cromatografia Líquida de Alta Pressão/métodos , Ácido Gálico/análise , Fumaça , ATPase Trocadora de Sódio-Potássio/análise , ATPase Trocadora de Sódio-Potássio/antagonistas & inibidores , Trombina/análise
11.
Scand J Clin Lab Invest ; 78(1-2): 149-152, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29141445

RESUMO

The Hemoclot® Thrombin Inhibitor (HTI) assay has been recommended for measurement of dabigatran concentrations in specific clinical situations. Traditionally, reagents for biochemical assays are prepared from instructions found in the package insert. For the HTI reagents the manufacturer recommends incubating the reagents much longer than indicated in the package insert. These recommendations are added to the application sheets designed for different analyzers. Many clinicians and laboratory personnel may be unaware of the discrepancy between the two instructions, resulting in incorrect handling of the reagents. The aim of this study was to investigate the effect of the two different preparation methods on reagent stability and test results. For the standard concentration range, reagent stability on Sysmex CS-2100i was only two hours instead of the eight hours indicated by the producer when following package insert instructions (incubation time: 15 min). Stability was increased to five hours when following the application sheet (incubation time: 60 min). Two years later, the study was repeated using samples of patients treated with dabigatran etexilate. This time, reagent stability was at least six hours. Since the reagent composition was unchanged, the increased stability could be due to changed logistics by the supplier, with stock and transfer closer by. Previously demonstrated HTI reagent instability is no longer an issue at our laboratory. The reliability of results of clinical studies in which the assay has been used is potentially compromised.


Assuntos
Antitrombinas/análise , Testes de Coagulação Sanguínea/instrumentação , Testes de Coagulação Sanguínea/métodos , Dabigatrana/análise , Humanos , Indicadores e Reagentes
12.
J Chromatogr B Analyt Technol Biomed Life Sci ; 1061-1062: 421-429, 2017 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-28818799

RESUMO

Thrombin (THR) plays a significant role in thromboembolic diseases, direct THR inhibitors are a class of important clinical anticoagulant drugs. This study established a THR in-solution based biospecific extraction combined with ultrafiltration and high performance liquid chromatography coupled with diode array detector and mass spectrometry analysis (TUA) method to screen and identify ligands for THR in Rhizoma Chuanxiong. After evaluating the reliability of the present TUA method using positive (argatroban) and negative (adenosine, tirofiban, ticagrelor) control drugs, this method was successfully applied to detect eight potential active compounds in Rhizoma Chuanxiong. Two new THR-targeted compounds isochlorogenic acid C and senkyunolide I with high THR inhibitory activity (IC50 206.48 and 197.23µM, respectively) were identified by liquid chromatography/mass spectrometry and enzyme inhibitory activity test finally. They were reported with direct THR inhibition activity for the first time and their ligand-THR interactions were explored by in silico molecular docking research. In addition, based on the TUA screening result, four compounds gained similar structure with the two hit compounds were also investigated as promising candidates targeting THR with high binding energy (>5.0kcal/mol). These results may prove that the proposed method could effectively screen THR inhibitors in complex mixtures.


Assuntos
Antitrombinas/análise , Cromatografia Líquida de Alta Pressão/métodos , Descoberta de Drogas/métodos , Medicamentos de Ervas Chinesas/química , Espectrometria de Massas/métodos , Ultrafiltração/métodos , Antitrombinas/química , Antitrombinas/isolamento & purificação , Antitrombinas/metabolismo , Simulação de Acoplamento Molecular
13.
Ann Hepatol ; 16(4): 574-583, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28611261

RESUMO

BACKGROUND AND AIMS: Portal vein thrombosis (PVT) is a critical complication in cirrhotic patients. We explored the role of the activated factor VII-antithrombin (FVIIa-AT) complex and enhanced monocytic tissue factor (TF) expression in the development and prediction of non-neoplastic PVT in cirrhotic patients. MATERIAL AND METHODS: A total of 30 HCV-cirrhosis patients were included in our study. They were compared to 35 cirrhotic patients without PVT, 15 non-cirrhotic patients with PVT, and 15 healthy controls. The plasma level of the FVIIa-AT complexes was analyzed by ELISA. MIF CD142, CD86, and HLA-DR on monocytes (CD14) were determined by flow cytometry. RESULTS: Compared with cirrhotic patients without PVT, cirrhotic patients with PVT had comparable plasma values of FVIIa, AT, and the FVIIa-AT complex. However, they had significantly lower values compared to non-cirrhotic patients with PVT and healthy controls. Cirrhotic patients with PVT had increased monocytic TF expression (MIF CD142) compared to non-PVT cirrhotic patients and healthy controls [86.5 (93.5) vs. 18 (32.0) and 11.0 (6.0), respectively; p < 0.001 for each]. However, cirrhosis PVT could not be distinguished from non-cirrhosis PVT. The area under the ROC curve of MIF CD142 was 0.759 (0.641- 0.876; p = 0.000) at an optimal cut-off value of 45, which yielded a sensitivity of 60% and a specificity of 77.1%, as well as a PPV and NPV of 69.2% for each. CONCLUSION: Enhanced expression of monocytic TF may have a role in the development and prediction of non-neoplastic PVT in HCV-cirrhosis patients. Large multicenter studies are necessary to validate our results.


Assuntos
Antitrombinas/análise , Coagulação Sanguínea , Fator VIIa/análise , Hepatite C/complicações , Cirrose Hepática/sangue , Veia Porta , Tromboplastina/análise , Trombose Venosa/sangue , Adulto , Área Sob a Curva , Biomarcadores/sangue , Estudos de Casos e Controles , Distribuição de Qui-Quadrado , Feminino , Hepatite C/sangue , Hepatite C/diagnóstico , Hepatite C/imunologia , Humanos , Cirrose Hepática/diagnóstico , Cirrose Hepática/imunologia , Cirrose Hepática/virologia , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Complexos Multiproteicos , Análise Multivariada , Veia Porta/diagnóstico por imagem , Valor Preditivo dos Testes , Estudos Prospectivos , Curva ROC , Fatores de Risco , Trombose Venosa/diagnóstico , Trombose Venosa/imunologia , Trombose Venosa/virologia , Adulto Jovem
14.
Br J Clin Pharmacol ; 83(7): 1466-1475, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28121368

RESUMO

AIMS: Venous thromboembolism is an important cause of postoperative morbidity and mortality in bariatric surgery. Studies of direct oral anticoagulants (DOACs) are not available in this surgical field. The objective of this phase 1 clinical trial was to investigate pharmacokinetic and pharmacodynamic (PK/PD) parameters of rivaroxaban in bariatric patients. METHODS: In this single-centre study, obese patients received single oral doses of rivaroxaban (10 mg) 1 day prior to and 3 days after bariatric surgery. PK and PD parameters were assessed at baseline and during 24 h after drug ingestion. RESULTS: Six Roux-en-Y gastric bypass patients and six sleeve gastrectomy patients completed the study. Mean rivaroxaban area under plasma concentration-time curve, peak plasma concentration, time to peak plasma concentration and terminal half-life were 971.9 µg·h l-1 (coefficient of variation: 10.6), 135.3 µg l-1 (26.7), 1.5 h and 13.1 h (34.1) prior to and 1165.8 (21.9), 170.0 (15.9), 1.5 and 8.9 (44.6) postsurgery for SG patients and 933.7 µg·h l-1 (22.3), 136.5 µg l-1 (10.7), 1.5 h und 13.8 h (46.6) prior to and 1029.4 (7.4), 110.8 (31.8), 2.5 and 15 (60.0) postsurgery for Roux-en-Y gastric bypass patients, respectively. Prothrombin fragments (F1 + 2) decreased during the first 12 hours and increased thereafter in the pre- and the postbariatric setting. Thrombin-antithrombin complexes dropped within 1-3 h in the prebariatric setting and remained low after surgery until they increased at 24 h postdose. Rivaroxaban was well tolerated and no relevant safety issues were observed. CONCLUSIONS: Bariatric surgery does not appear to alter PK of rivaroxaban in a clinically relevant way. Effective prophylactic postbariatric anticoagulation is supported by changes in PD.


Assuntos
Inibidores do Fator Xa/farmacologia , Derivação Gástrica/efeitos adversos , Obesidade/cirurgia , Complicações Pós-Operatórias/prevenção & controle , Rivaroxabana/farmacologia , Tromboembolia Venosa/prevenção & controle , Administração Oral , Adulto , Antitrombinas/análise , Relação Dose-Resposta a Droga , Inibidores do Fator Xa/uso terapêutico , Feminino , Derivação Gástrica/métodos , Meia-Vida , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade/sangue , Período Pós-Operatório , Período Pré-Operatório , Protrombina/análise , Rivaroxabana/uso terapêutico , Trombina/análise , Tromboembolia Venosa/sangue
16.
J Gastroenterol Hepatol ; 32(7): 1378-1386, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28012194

RESUMO

BACKGROUND AND AIM: Liver dysfunction with decreased antithrombin (AT) activity and/or thrombocytopenia is life threatening in pregnant women. Whether AT is clinically useful for prediction of liver dysfunction remains unclear. METHODS: A total of 541 women were registered prospectively at gestational week 34.7 (20.0-41.4) with available data on antenatal AT and platelet count (PLC). RESULTS: Liver dysfunction defined as serum aspartate aminotransferase > 45 IU/L concomitant with lactate dehydrogenase > 400 IU/L occurred in five women antenatally (≤ 2 weeks before delivery) and in 17 women post-partum (within 1 week post-partum). Median (5th-95th) antenatal value was 85 (62-110)% for AT and 202 (118-315) × 109 /L for PLC in the 541 women and was significantly lower in women with than without perinatal liver dysfunction; 75 (51-108) versus 86 (62-110)% and 179 (56-244) versus 203 (121-316) × 109 /L, respectively. Nineteen (86%) women with liver dysfunction showed AT ≤ 62% or thrombocytopenia (PLC ≤ 118 × 109 /L) perinatally, but five lacked thrombocytopenia throughout the perinatal period. The best cut-off (AT, 77%; PLC, 139 × 109 /L) suggested by receiver operating characteristic curve gave antenatal AT and PLC sensitivity of 59% and 41% with positive predictive value of 8.6% and 14%, respectively, and combined use of AT and PLC improved sensitivity to 73% (16/22) with positive predictive value of 9.2% for prediction of perinatal liver dysfunction. CONCLUSIONS: Reduced AT not accompanied by thrombocytopenia can precede liver dysfunction. Clinical introduction of AT may enhance the safety of pregnant women.


Assuntos
Antitrombinas/análise , Hepatopatias/etiologia , Complicações na Gravidez , Trombocitopenia , Trombofilia , Adolescente , Adulto , Aspartato Aminotransferases/sangue , Biomarcadores/sangue , Feminino , Idade Gestacional , Humanos , L-Lactato Desidrogenase/sangue , Hepatopatias/diagnóstico , Pessoa de Meia-Idade , Contagem de Plaquetas , Valor Preditivo dos Testes , Gravidez , Estudos Prospectivos , Curva ROC , Sensibilidade e Especificidade , Trombocitopenia/sangue , Trombofilia/sangue , Adulto Jovem
17.
Thromb Haemost ; 116(3): 452-60, 2016 08 30.
Artigo em Inglês | MEDLINE | ID: mdl-27412396

RESUMO

In the absence of specific antidote to fondaparinux, two modified forms of antithrombin (AT), one recombinant inactive (ri-AT) and the other chemically inactivated (chi-AT), were designed to antagonise AT-mediated anticoagulants, e. g. heparins or fondaparinux. These inactive ATs were previously proven to effectively neutralise anticoagulant activity associated with heparin derivatives in vitro and in vivo, as assessed by direct measurement of anti-FXa activity. This study was undertaken to evaluate in vitro the effectivity of inactive ATs to reverse anticoagulation by heparin derivatives and to compare them with non-specific fondaparinux reversal agents, like recombinant-activated factor VII (rFVIIa) or activated prothrombin-complex concentrate (aPCC), in a thrombin-generation assay (TGA). Addition of fondaparinux (3 µg/ml) to normal plasma inhibited thrombin generation by prolonging lag time (LT) as much as 244 % and lowering endogenous thrombin potential (ETP) to 17 % of their control (normal plasma) values. Fondaparinux-anticoagulant activity was reversed by ri-AT and chi-AT, as reflected by the corrections of LT up to 117 % and 114 % of its control value, and ETP recovery to 78 % and 63 %, respectively. Unlike ri-AT that had no effect on thrombin generation in normal plasma, chi-AT retained anticoagulant activity that minimises its reversal capacity. However, both ATs were more effective than rFVIIa or aPCC at neutralising fondaparinux and, unlike non-specific antidotes, inactive ATs specifically reversed AT-mediated anticoagulant activities, as suggested by their absence of procoagulant activity in anticoagulant-free plasma.


Assuntos
Antídotos/metabolismo , Antitrombinas/metabolismo , Polissacarídeos/antagonistas & inibidores , Trombina/biossíntese , Anticoagulantes/administração & dosagem , Antídotos/análise , Antitrombinas/análise , Análise Química do Sangue/métodos , Relação Dose-Resposta a Droga , Fator VIIa/análise , Fator VIIa/metabolismo , Inibidores do Fator Xa/análise , Inibidores do Fator Xa/metabolismo , Fondaparinux , Hemostáticos/análise , Hemostáticos/metabolismo , Heparina/administração & dosagem , Heparina de Baixo Peso Molecular/antagonistas & inibidores , Humanos , Técnicas In Vitro , Trombina/análise
18.
Int J Lab Hematol ; 37(4): 551-9, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-25766006

RESUMO

INTRODUCTION: Current recommendations for coagulation testing storage and thawing are based on historical studies that were performed using unbuffered 3.8% sodium citrate. We sought to measure the effects of freezing and thawing conditions 3.2% buffered sodium citrate plasma samples that have been stored in vials with either snap or sealed screw tops, frozen in -70 °C freezer or dry ice and thawed either capped or uncapped. METHODS: Shed blood samples were pooled and then aliquoted into four snap top and four screw tops vials. Half the vials were stored in a -70 °C freezer, and half on dry ice for at least 16 h. Afterwards, half the frozen samples were thawed in 37 °C waterbath capped, and other half were thawed capped. After thawing cycles, samples were tested for PT, activated partial thromboplastin time (APTT), fibrinogen, D-dimer, factor assays, von Willebrand factor activity, plasminogen, antithrombin, protein C and lupus anticoagulant. RESULTS: Prothrombin time, APTT, factor X, and lupus anticoagulant testing were affected by all vials, freezing and thawing conditions, whereas fibrinogen, D-dimer, von Willebrand activity or protein C were not affected by any vial, freezing or storage condition. CONCLUSIONS: Storage vials, freezing and thawing condition affect coagulation testing, although these differences may not be clinically significant.


Assuntos
Produtos de Degradação da Fibrina e do Fibrinogênio/normas , Tempo de Tromboplastina Parcial/normas , Tempo de Protrombina/normas , Manejo de Espécimes/normas , Antitrombinas/análise , Antitrombinas/metabolismo , Coagulação Sanguínea/fisiologia , Fator X/análise , Fator X/metabolismo , Congelamento , Humanos , Inibidor de Coagulação do Lúpus/análise , Inibidor de Coagulação do Lúpus/metabolismo , Plasminogênio/análise , Plasminogênio/metabolismo , Proteína C/análise , Proteína C/metabolismo , Fator de von Willebrand/análise , Fator de von Willebrand/metabolismo
20.
J Crit Care ; 29(5): 884.e1-6, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-24891151

RESUMO

PURPOSE: The purpose of this study is to evaluate the coagulation and inflammatory profiles in septic shock patients with baseline hyperglycemia under glycemic control. METHODS: Prospective, observational study conducted in an intensive care unit of a university hospital, including 41 septic shock nondiabetic patients with hyperglycemia (n = 21) or normoglycemia (n = 20) profiles at baseline. Hyperglycemic patients received a glucose control protocol (target glycemia, <150 mg/dL). Metabolic, inflammatory, and coagulation markers were measured at baseline and after 24 hours. RESULTS: Median glycemic values between groups were different at baseline but not after 24 hours. Baseline coagulation profile was similar in both groups with elevated levels of coagulation markers, reduced factor VII, protein C, and antithrombin activities and fibrinolysis impairment. Normoglycemic patients had unchanged coagulation markers after 24 hours. After treatment, previously hyperglycemic patients exhibited increased plasminogen concentrations (P = .03) and reduced levels of plasminogen activator inhibitor 1 (P = .01) and tissue plasminogen activator (P = .03) as compared with baseline. They also had higher factor VII (P = .03), protein C (P = .04), and antithrombin (P = .04) activities than normoglycemic patients. Inflammatory markers were elevated in both groups and improved after 24 hours, independently of the glycemic profile. CONCLUSIONS: Glycemic control during septic shock is associated with improvements in coagulation and fibrinolysis parameters compared with baseline and normoglycemic patients.


Assuntos
Coagulação Sanguínea , Fibrinólise , Hiperglicemia/tratamento farmacológico , Choque Séptico/sangue , Idoso , Algoritmos , Antitrombinas/análise , Biomarcadores/sangue , Glicemia/análise , Fator VII/análise , Feminino , Humanos , Hiperglicemia/sangue , Hiperglicemia/etiologia , Unidades de Terapia Intensiva , Masculino , Pessoa de Meia-Idade , Inibidor 1 de Ativador de Plasminogênio/sangue , Estudos Prospectivos , Proteína C/análise , Ativador de Plasminogênio Tecidual/sangue
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...