BACKGROUND: The pathology of primary hemostasis is a common complication of extracorporeal membrane oxygenation (ECMO) support. Scientific data describing its changes in patients on short-term ECMO support and the ability and speed of the restoration of its functions are limited. AIMS: The aim of this study was to describe the pathology of primary hemostasis induced by short-term ECMO support and its development over time using PFA-200, ROTEM platelet, and von Willebrand factor (vWF) analyses. METHODS: In patients undergoing lung transplantation surgery using intraoperative veno-arterial ECMO support, blood samples were analyzed using the following tests: PFA-200, ROTEM platelet tests, vWF antigen, ristocetin cofactor (RCo), and collagen-binding protein (CB) before, during, and after ECMO support. RESULTS: Blood samples from 32 patients were analyzed. All 3 PFA-200 tests (COL/EPI, COL/ADP, and COL/P2Y) showed significant deterioration during ECMO support with rapid restoration after ECMO cessation (p < 0.05), suggesting an ECMO-induced primary hemostasis disorder. A significant increase of vWF antigen after ECMO cessation (p < 0.05) was found with an increase of RCo and CB levels, although it was not significant (p > 0.05). CONCLUSIONS: Short-term ECMO support induces primary hemostasis pathology. It occurs immediately after initiation but is rapidly restored after ECMO cessation, which is detectable by PFA-200. Despite there being persistent platelet dysfunction after ECMO cessation, as seen with the ROTEM platelet results, the increased levels of vWF antigen might explain the normal results of primary hemostasis detected by PFA-200.
- MeSH
- časové faktory MeSH
- dospělí MeSH
- hemostáza * fyziologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mimotělní membránová oxygenace * metody MeSH
- transplantace plic * MeSH
- von Willebrandův faktor metabolismus analýza MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- pozorovací studie MeSH
The cases of antithrombin (AT)-deficient pregnant women with a homozygous HBS II mutation are relatively rare and are accompanied by an increased thrombophilic risk, which is manifested by increased thrombin generation (TG). It is very difficult to ensure their prophylactic treatment during pregnancy. We aimed to determine the utility of the thrombin generation assay (TGA) and anti-factor Xa (anti-FXa) test to monitor the effects of a prophylactic dose of low-molecular-weight heparin (LMWH) in a 28-year-old woman with homozygous AT deficiency caused by mutation c.391C > T#, (p.Leu131Phe†) in the SERPINC1 gene and to compare the findings with those from a group of pregnant and non-pregnant women also treated with LMWH. TG monitoring was chosen due to severe AT deficiency that was manifested by low levels of anti-FXa activity when monitoring the efficacy of LMWH treatment. A significant decrease in TG was detected in all monitored groups (P < .05). There were no thrombotic complications during the whole pregnancy of the woman with AT deficiency. Consistent monitoring of TG with LMWH anticoagulant therapy administration during pregnancy together with AT administration before and after delivery may improve the overall condition of pregnant women and the quality of their care.
- Publikační typ
- časopisecké články MeSH
OBJECTIVES: Degradation of coagulation proteins in frozen plasma may influence assay results. The aims of this study were to explore the changes in coagulation parameters in patient plasma and internal quality control (IQC) after different freezing and storage conditions during the short-term and long-term periods. METHODS: Platelet poor plasma was prepared from citrated peripheral blood collected from a group of healthy donors. The plasma was pooled, frozen and stored in a variety of freezing and storage conditions. The changes were monitored using routine coagulation assays, as well as factor VIII (FVIII) and protein S (PS) assays. RESULTS: Plasma stored in liquid nitrogen (LN 2 ) or in -80°C showed long-term stable values for routine tests for a period of over 12 months, and 6 months for FVIII. Interestingly, the activated partial thromboplastin time (aPTT) showed a temporary significant prolongation over the first two weeks. Plasma frozen and stored in -40°C is not viable for aPTT and FVIII testing, otherwise it can be used for other parameters for up to 4 months. PS showed a significant increase in all frozen samples. Freezing rate has a significant impact on plasma quality and the final storage temperature influences the long-term stability. CONCLUSION: The optimal storage conditions are ultra-low temperatures (LN 2 or -80°C) and the highest freezing rate possible. However, frozen plasma is not viable for IQC of aPTT during a period of two weeks after freezing. This study is unique in its conception as a practical guide for the handling of frozen plasma samples in modern laboratory settings.
- MeSH
- hemokoagulace MeSH
- hemostatika * MeSH
- krevní plazma * MeSH
- lidé MeSH
- parciální tromboplastinový čas MeSH
- vyšetření krevní srážlivosti MeSH
- zmrazování MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: Inherited protein S deficiency is a thrombophilic risk factor associated with venous thromboembolism. However, there is not much data on the impact of mutation position on thrombotic risk. OBJECTIVES: The aim of this study was to evaluate the risk of thrombosis due to mutations located in the sex hormone-binding globulin (SHBG)-like region as opposed to the rest of the protein. METHODS: Genetic analysis of PROS1 was performed in 76 patients with suspected inherited protein S deficiency, and the effect of missense mutations present in the SHBG region on thrombosis risk was analyzed by statistical methods. RESULTS: We found 30 unique mutations (13 of them novel), of which 17 were missense mutations, in 70 patients. Patients with missense mutations were then divided into 2 groups: the "SHBG-region" mutation group (27 patients) and the "non-SHBG" group (24 patients). The multivariable binary logistic regression analysis showed that mutation position in the SHBG region of protein S is an independent risk factor for thrombosis in deficient patients (OR, 5.17; 95% CI, 1.29-20.65; P = .02). The patients with a mutation in the SHBG-like region also developed a thrombotic event at a younger age compared to the "non-SHBG" group in the Kaplan-Meier analysis (median thrombosis-free survival of 33 vs 47 years, respectively; P = .018). CONCLUSION: Our findings show that a missense mutation located in the SHBG-like region may contribute to higher thrombotic risk rather than a missense mutation located elsewhere in the protein. However, as our cohort was relatively small, these findings should be taken with this limitation.
- Publikační typ
- časopisecké články MeSH
- MeSH
- antithrombin III antagonisté a inhibitory MeSH
- indikátory a reagencie analýza MeSH
- lidé MeSH
- mutace MeSH
- nedostatek antitrombinu III * prevence a kontrola vrozené MeSH
- reagenční diagnostické soupravy statistika a číselné údaje MeSH
- vyšetření krevní srážlivosti MeSH
- žilní trombóza prevence a kontrola MeSH
- Check Tag
- lidé MeSH
Během září a října roku 2021 proběhl na popud Centra pro trombotické mikroangiopatie Ostrava (C4TMO) a České skupiny pro trombotické mikroangiopatie (CS4TMA) formou on-line dotazování připraveného společností IQVIA podle podkladů CS4TMA mezi klinickými hematology průzkum s cílem ověřit povědomí klinických hematologů o pravidlech a dostupnosti péče o pacienty s trombotickými mikroangiopatiemi. Odborným základem pro vytvoření sady otázek byly formulace pravidel správné klinické praxe péče o pacienty s trombotickou trombocytopenickou purpurou. Celkem bylo provedeno 49 rozhovorů. Výsledky průzkumu svědčí o velmi dobré klinické praxi péče o pacienty s akutní trombotickou mikroangiopatií na pracovištích respondentů. Spektrum pracovišť, které se zúčastnily průzkumu však neodpovídají skutečnému spektru hematologických pracovišť v České republice. Chybí data především z malých ambulancí v rámci nemocnic II. typu nebo mimo nemocnice.
From September to October 2021, at the request of the Centre for Thrombotic Microangiopathies Ostrava (C4TMO) and the Czech Group for Thrombotic Microangiopathies (CS4TMA), an online survey prepared by IQVIA based on CS4TMA data was conducted among clinical haematologists to verify the awareness of clinical haematologists about the rules and availability of care for patients with thrombotic microangiopathies. The professional basis for the development of the questionnaire was the formulation of good clinical practice guidelines for the care of patients with thrombotic thrombocytopenic purpura. A total of 49 interviews were conducted. The results of the survey indicate very good clinical practice for the care of patients with acute thrombotic microangiopathy at the respondents‘ institutions. However, the spectrum of departments that participated in the survey does not correspond to the actual spectrum of haematology departments in the Czech Republic. In particular, data from small outpatient clinics within type II hospitals or outside hospitals are missing.
- MeSH
- fixace tkání MeSH
- lidé MeSH
- protein ADAMTS13 krev MeSH
- průzkumy a dotazníky MeSH
- trombotické mikroangiopatie * diagnóza terapie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
- Geografické názvy
- Česká republika MeSH
Koordinovaný postup provádění odběrů krve, preanalytického zpracování a uchovávání biologického materiálu v kteroukoli denní nebo noční dobu je důležité především u pacientů s prudce probíhajícím onemocněním, kdy zahájení léčby (např. výměnnou plazmaferézou) před provedením odběrů krve může ovlivnit výsledky laboratorních vyšetření a komplikovat další diferenciální diagnostiku. Do této skupiny řadíme jednoznačně i trombotické mikroangiopatie. V článku prezentujeme postup otestovaný v klinické praxi v podmínkách Fakultní nemocnice Ostrava. Ve druhém kroku byl postup představen a diskutován s experty z ostatních hematologických center. Výsledkem této diskuze bylo vytvoření univerzální žádanky o zpracování a archivaci vzorků krve, která může přispět ke standardizaci postupu v dalších zdravotnických zařízeních.
Coordinated blood collection, pre-analytical processing, and storage of biological material at any time of the day or night is particularly important in patients with rapidly progressive disease, where initiation of treatment (e. g., plasmapheresis) before blood collection may affect laboratory results and complicate further differential diagnosis. Thrombotic microangiopathies belong to this group of diseases. In this article, we present a procedure tested in clinical practice at the University Hospital Ostrava. Next, the procedure was presented and discussed with experts from other haematology centres. The result of this discussion was the creation of a universal request form for the processing and archiving of blood samples, which may contribute to the standardization of the procedure in other medical institutions.
BACKGROUND: Extracorporeal membrane oxygenation (ECMO) support is often associated with bleeding complications caused by secondary or primary hemostasis pathology. However, there are limited data investigating primary hemostasis using Multiplate aggregometry with specific diagnostics tests for vWF (von Willebrand factor) deficiency. AIMS: The aim of this study was to find out whether short-term ECMO produces the pathology of primary hemostasis that is detected by Multiplate aggregometry and to investigate the pathology of vWF. METHODS: In this study, blood samples of 20 patients undergoing lung transplantations with short-term perioperative ECMO support were analyzed. The multimeric structure, the levels of von Willebrand factor antigen (vWF), ristocetin cofactor (RCo), collagen-binding protein (CB), and the results of multiple electrode aggregometry RISTO (ristocetin), ADP (adenosine diphosphate), ASPI (Aspirin®; arachidonic acid), and TRAP (thrombin receptor activating peptide) tests were compared to the samples obtained before and after ECMO support. RESULTS: The Multiplate ADP and RISTO tests showed the presence of significant pathology in primary hemostasis after surgery (p < 0.05), suggesting the presence of acquired platelet dysfunction. Although the RISTO tests suggest the presence of acquired vWF deficiency, laboratory tests for vWF antigen and RCo and CB tests showed an increase in this case. The multimeric structure of vWF did not show clinically significant deterioration. CONCLUSIONS: Multiple aggregometry ADP, ASPI, and TRAP tests seem to be able to detect primary hemostasis pathology (platelets aggregation and adhesion pathology) that is present during short-term perioperative ECMO support in lung transplantation procedures. Interestingly, RISTO tests seem to be more suitable for the diagnosis of platelet dysfunction than the diagnosis of acquired vWF deficiency in this situation.
- MeSH
- adenosindifosfát MeSH
- hemostáza MeSH
- lidé MeSH
- mimotělní membránová oxygenace * škodlivé účinky metody MeSH
- retrospektivní studie MeSH
- trombocytopatie * MeSH
- von Willebrandova nemoc * MeSH
- von Willebrandův faktor metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- pozorovací studie MeSH
A single-center study was conducted on 120 patients with inherited disorders of primary hemostasis followed at our hematological center. These patients presented a variety of bleeding symptoms; however, they had no definitive diagnosis. Establishing a diagnosis has consequences for the investigation of probands in families and for treatment management; therefore, we aimed to improve the diagnosis rate in these patients by implementing advanced diagnostic methods. According to the accepted international guidelines at the time of study, we investigated platelet morphology, platelet function assay, light-transmission aggregometry, and flow cytometry. Using only these methods, we were unable to make a definitive diagnosis for most of our patients. However, next-generation sequencing (NGS), which was applied in 31 patients, allowed us to establish definitive diagnoses in six cases (variants in ANKRD26, ITGA2B, and F8) and helped us to identify suspected variants (NBEAL2, F2, BLOC1S6, AP3D1, GP1BB, ANO6, CD36, and ITGB3) and new suspected variants (GFI1B, FGA, GP1BA, and ITGA2B) in 11 patients. The role of NGS in patients with suspicious bleeding symptoms is growing and it changes the diagnostic algorithm. The greatest disadvantage of NGS, aside from the cost, is the occurrence of gene variants of uncertain significance.
- MeSH
- krevní proteiny genetika MeSH
- krvácení MeSH
- lidé MeSH
- trombocytopatie * diagnóza genetika MeSH
- vyšetření funkce trombocytů MeSH
- vysoce účinné nukleotidové sekvenování MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
INTRODUCTION: Severe COVID-19 is associated with an important increase of von Willebrand factor and mild lowering of ADAMTS13 activity that may, in the presence of a strong inflammatory reaction, increase the risk of acute thrombotic thrombocytopenic purpura (TTP). Although acute episodes of immune-mediated TTP associated with COVID-19 or SARS-CoV-2 vaccination have been reported, data about clinical evolution of hereditary TTP (hTTP) during the pandemic are scarce. METHOD: We conducted a survey among adult patients of the International Hereditary TTP Registry about SARS-CoV-2 vaccination, COVID-19, and occurrence of acute hTTP episodes. RESULTS: Of 122 adult hTTP patients invited to participate, 86 (70.5%) responded. Sixty-five had been vaccinated (75.6%), of which 14 had received in addition a booster, resulting in 139 individual vaccine shots. Although vaccinations in patients on plasma prophylaxis were done within 1 week of the last plasma infusion, all 23 patients treated with plasma on demand were vaccinated without prior plasma infusions. One patient on uninterrupted weekly plasma infusions presented within 3 days from his second vaccination with neurological symptoms and computed tomography scan 9 days later showed subacute ischemic/hemorrhagic frontal lobe infarction. A second male patient developed acute myocarditis after his second dose of mRNA-1273 vaccine. Twelve (14%) patients had COVID-19, associated with an acute hTTP episode in three of them: one patient had a transient ischemic attack, one a stroke, and a pregnant woman was hospitalized to intensify plasma treatment. DISCUSSION: The risk of an acute episode triggered by COVID-19 seems higher than following vaccination in hTTP patients, who can be safely vaccinated against SARS-CoV-2.
- Publikační typ
- časopisecké články MeSH
