35 research outputs found
Diagnosis of von Willebrand disease in Argentina: a single institution experience
von Willebrand disease (VWD) is the most common autosomal bleeding disorder, mostlyinherited as dominant trait. VWD is due to deficiency/abnormality of von Willebrand factor (VWF). Thetrue prevalence of VWD is unknown, but estimated as 0.1% to 1% of the general population. The bleeding score (BS) was used to evaluate the bleeding status of patients presenting atour institution. Laboratory analyses include: VWF:Ag, VWF:RCo, VWF:CB, multimeric pattern, VWFpropeptide, Desmopressin challenge test. Genotypic analysis comprises the study of specific exons of VWF,depending on the suspected variant.Fil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Kempfer, Ana Catalina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Paiva Palomino, Juvenal HernĂĄn. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Blanco, Alicia Noemi. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentin
Clinical Features And Laboratory Patterns In A Cohort Of Consecutive Argentinian Patients With Von Willebrand's Disease
Background and Objectives. von Willebrand's disease (vWD) is a bleeding disorder with variable clinical expression. Our aim was to classify patients with vWD and to determine the phenotype in their relatives. Design and Methods. The types and subtypes, blood group frequency and its relevance, bleeding sites, response to the desmopressin (DDAVP) test, transfusion requirements and clinical features in type 1 and 2A families were determined in 1,885 patients. Results. Our findings were: type 1: 91%, type 2A: 3.1%, severe vWD: 1.3%; type 2N: 1.6%; type low intraplatelet: 2.7%; combined 1+2N: 0.3%. Blood group O prevalence was 70.5%. Bleeding and transfusion requirements were not correlated to blood groups. The most frequent symptoms were: ecchymoses-hematomas and epistaxis and, in females over 13 years, also menorrhagia. Normal levels of factor VIII:C were found in 38.4% of the patients. DDAVP was infused in 567 patients with a good response in 80.6%. About 9% of our patients needed transfusion therapy. The diagnosis of von Willebrandâs disease is more likely in subjects belonging to families with type 2A disease than in members of families with type 1 vWD in spite of these being symptomatic. Interpretation and Conclusions. These observations provide a good strategy to identify, classify and treat vWD patients without performing molecular assays.Fil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Meschengieser, S. S.. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Blanco, A. N.. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Salviu, M. J.. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Farias, Cristina Elena. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Kempfer, Ana Catalina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Academia Nacional de Medicina de Buenos Aires; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Academia Nacional de Medicina de Buenos Aires; Argentin
Type 2A and 2M von Willebrand Disease: Differences in Phenotypic Parameters According to the Affected Domain by Disease-Causing Variants and Assessment of Pathophysiological Mechanisms
Type 2A and 2M von Willebrand disease (VWD) broadly show similar phenotypic parameters, but involve different pathophysiological mechanisms. This report presents the clinical and laboratory profiles of type 2A and type 2M patients genotypically diagnosed at one large center. Higher bleeding score values and a higher incidence of major bleeding episodes were observed in type 2A compared with type 2M, potentially reflective of the absence of large and intermediate von Willebrand factor (VWF) multimers in 2A. In type 2A, most of disease-causing variants (DCVs) appeared to be responsible for increased VWF clearance and DCV clustered in the VWF-A1 domain resulted in more severe clinical profiles. In type 2M, DCV in the VWF-A1 domain showed different laboratory patterns, related to either reduced synthesis or shortened VWF survival, and DCV in the VWF-A2 domain showed patterns related mainly to shortened survival. VWF-type 1 collagen binding/Ag (C1B/Ag) showed different patterns according to DCV location: in type 2A VWD, C1B/Ag was much lower when DCVs were located in the VWF-A2 domain. In type 2M with DCV in the VWF-A1domain, C1B/Ag was normal, but with DCV in the VWF-A2 domain, C1B/Ag was low. The higher frequency of major bleeding in VWD 2M patients with DCV in the VWF-A2 domain than that with DCV in the VWF-A1 domain could be a summative effect of abnormal C1B/Ag, on top of the reduced VWF-GPIb binding. In silico modeling suggests that DCV impairing the VWF-A2 domain somehow modulates collagen binding to the VWF-A3 domain. Concomitant normal FVIII:C/Ag and VWFpp/Ag, mainly in type 2M VWD, suggest that other nonidentified pathophysiological mechanisms, neither related to synthesis/retention nor survival of VWF, would be responsible for the presenting phenotype.Fil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Paiva, Juvenal. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; ArgentinaFil: Primrose, DĂ©bora Marina. Universidad de MorĂłn; ArgentinaFil: Blanco, Alicia Noemi. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentin
Fator Von Willebrand e doença de von Willebrand: novas abordagens diagnósticas
El factor von Willebrand (VWF) es una glicoproteĂna que se sintetiza en cĂ©lulas endoteliales y en megacariocitos. Su vida media es de ~12 horas. EstĂĄ formado por multĂmeros de diferentes pesos moleculares, pequeños, intermedios, grandes y extragrandes. La actividad funcional reside en los multĂmeros grandes, y los extragrandes son trombogĂ©nicos. Promueve la adhesiĂłn plaquetaria al subendotelio, la agregaciĂłn plaquetaria y transporta al FVIII en plasma, protegiĂ©ndolo de su degradaciĂłn por proteasas. La enfermedad de von Willebrand es el trastorno hemorrĂĄgico mĂĄs frecuente; se describen deficiencias cuantitativas (parcial: VWD1; total: VWD3) o defectos cualitativos (VWD2A, VWD2M, VWD2B y VWD2N). La expresiĂłn clĂnica es variable (sangrado muco-cutĂĄneo) y su herencia autosĂłmica, dominante o recesiva, segĂșn las variantes. Los niveles del VWF dependen de factores genĂ©ticos y no genĂ©ticos que afectan el diagnĂłstico y la expresiĂłn clĂnica. Para llegar al diagnĂłstico se precisan varias pruebas, algunas inespecĂficas. El laboratorio comienza con pruebas orientadoras, se continĂșa con pruebas confirmatorias, y posteriormente pruebas para definir la variante de VWD. El diagnĂłstico genotĂpico es fundamental para lograr el diagnĂłstico diferencial entre VWD2B vs. PT-VWD y VWD2N vs. Hemofilia A (leve-moderada), diferenciar VWD de AVWS y discriminar variantes VWD2.Von Willebrand factor (VWF) is a glycoprotein with essential roles in both primary and secondary hemostasis, synthesized by endothelial cells and megakaryocytes. Its half-life is ~12 hours. VWF consists in multimers of different molecular weight: small, intermediate, large and ultra large. The functional activity resides in the large multimers; the ultra large are thrombogenic. VWF promotes platelet adhesion to subendothelium, platelet aggregation and binds FVIII, protecting it from proteolysis and preserving its hemostatic function. Von Willebrand disease is the most common bleeding disorder; qualitative defects (VWD2A, VWD2M, VWD2B and VWD2N) and quantitative deficiencies (VWD1 and VWD3) are described. The clinical expression is variable (mucocutaneous bleeding); VWF levels depend on genetic and non-genetic factors affecting diagnosis and clinical expression. The inheritance can be autosomal, dominant or recessive according to the variants. To reach diagnosis, several tests are required, being some of them unspecific. The laboratory testing begins with global tests, followed by confirmatory tests and further tests to define the variant of VWD. Genotypic studies are essential to achieve the differential diagnosis between VWD2B vs. PT-VWD, VWD2N vs. Hemophilia A (mild to moderate) and differentiate VWD from AVWS and discriminate VWD2 variants.O fator de von Willebrand (vWF) Ă© uma glicoproteĂna sintetizada em cĂ©lulas endoteliais e em megacariĂłcitos. Sua vida mĂ©dia Ă© de ~12 horas. Ă constituĂdo por multĂmeros de pesos moleculares diferentes, pequenos, intermediĂĄrios, grandes e extragrandes. A atividade funcional reside nos multĂmeros grandes, sendo os extragrandes, trombogĂȘnicos. Promove adesĂŁo das plaquetas ao subendotĂ©lio, a agregação plaquetĂĄria e transporta o FVIII em plasma, protegendo-o de sua degradação. A doença de von Willebrand Ă© o distĂșrbio hemorrĂĄgico mais frequente; sĂŁo descritas deficiĂȘncias quantitativas (parcial: VWD1; total: VWD3) ou defeitos qualitativos (VWD2A, VWD2M, VWD2B e VWD2N). A expressĂŁo clĂnica Ă© variĂĄvel, (sangramento mucocutĂąneo), e sua herança autossĂŽmica dominante ou recessiva de acordo com as variantes. Os nĂveis de vWF dependem de fatores genĂ©ticos e nĂŁo-genĂ©ticos que afetam o diagnĂłstico e a expressĂŁo clĂnica. Para fazer o diagnĂłstico, vĂĄrios testes sĂŁo necessĂĄrios, alguns inespecĂficos. O laboratĂłrio começa com testes orientadores, continua com testes de confirmação e, mais tarde, com testes para definir a variante de VWD. O diagnĂłstico genotĂpico Ă© essencial para alcançar o diagnĂłstico diferencial entre VWD2B vs. PT-VWD e VWD2N vs. Hemofilia A (leve a moderada), diferenciar VWD de AVWS, discriminar variantes VWD2.Fil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Blanco, Alicia Noemi. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Kempfer, Ana Catalina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Paiva Palomino, Juvenal HernĂĄn. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Bermejo, Emilse. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Lazzari, Maria Angela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentin
Combined effects of two mutations in von Willebrand disease 2M phenotype
Background: Type 2M von Willebrand disease (VWD2M) is usually characterized byVWF:RCo/VWF:Ag<0.6 and normal multimeric profile; desmopressin (DDAVP) challengetest commonly shows poor response of VWF:RCo.Objective: We describe the bleeding tendency and the laboratory phenotype in a patient carrying two heterozygous mutations affecting VWF-A1 domain and VWF-A2domain.Subjects/methods: A 12-year-old patient (O blood group) with severe hemorrhagictendency was phenotypically and genotypically analyzed; his parents were alsostudied.Results: The proband showed decrease FVIII:C, VWF:RCo/VWF:Ag, and VWF:CB6/VWF:Ag ratios, but normal platelet count, VWF:CB1/VWF:Ag ratio, VWFpp and multimeric pattern, suggesting a VWD2M phenotype. The DDAVP challenge test, compared to controls (VWD2M patients with mutations in VWF-A1 domain), showed lower increase of FVIII:C and VWF:Ag than in heterozygous, but very similar to homozygous control. Two mutations were found in heterozygous and trans presentation: p.Pro1648fs*45 and a novel missense mutation, p.Arg1426Cys. The mother was p.Arg1426Cys heterozygous carrier, with few clinical symptoms. The father was asymptomatic, with no mutations. The p.Pro1648fs*45 was considered an apparent de novo mutation; proband?s AS-PCR revealed mosaicism in the paternal allele. According to the predicted models, p.Arg1426Cys would not be affecting the binding of GPIbα to A1 domain, whereas p.Pro1648fs*45 seems to modify the folding of A2 domain, and in this way, it would affect the binding to GPIbα and type VI collagen. We believe that the combination of these two heterozygous mutations, in a child with O blood group, could result in a defective phenotype enhancer.eCollection 2018 JanFil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Paiva Palomino, Juvenal HernĂĄn. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; ArgentinaFil: Kempfer, Ana Catalina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Primrose, Debora Marina. Universidad de MorĂłn. Facultad de AgronomĂa y Ciencias Agroalimentarias; ArgentinaFil: Blanco, Alicia Noemi. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas "Mariano R. Castex". Departamento de Hemostasia y Trombosis; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentin
Acquired inhibitors of blood coagulation: diagnostic perpective and especial cases
Los inhibidores adquiridos son defectos raros. Se asocian a diferentes manifestaciones clĂnicas con morbimortalidad significativa. Su detecciĂłn es importante para implementar el tratamiento sin demora. Hay inhibidores especĂficos (bloquean funciĂłn), contra todos los factores de la coagulaciĂłn y ademĂĄs VWF, o de interferencia (afectan una o varias vĂas de la coagulaciĂłn). Los inhibidores especĂficos son alo-anticuerpos desarrollados en pacientes deficitarios (complicaciĂłn terapĂ©utica) o auto-anticuerpos presentes en individuos sin alteraciones previas. Hay anticuerpos especĂficos que pueden afectar la depuraciĂłn pero no inhiben funciĂłn. Inhibidores de interferencia: inmunoglobulinas u otras sustancias (heparina/heparinoides, PDF/pdf, PIVKAS, molĂ©culas anĂłmalas, etc.) asociadas a diferentes situaciones clĂnicas (asintomĂĄticos, sangrados, trombosis y/o complicaciones obstĂ©tricas). El laboratorio es fundamental para el diagnĂłstico. Las pruebas globales detectan el defecto, que no corrigen por el agregado de plasma normal; se caracteriza luego el tipo de inhibidor y eventualmente se titula. Esto es complejo; hay variabilidad en los resultados y posibilidad de falsos positivos o negativos, ademĂĄs las pruebas no son estrictamente especĂficas. Los algoritmos diagnĂłsticos son Ăștiles, pero no contemplan la posibilidad de defectos combinados. Es crĂtico caracterizar al inhibidor y descartar posibles interferencias o defectos concomitantes; ello requiere aplicar las pruebas adecuadas e interpretarlas correctamente.Los inhibidores adquiridos son defectos raros. Se asocian a diferentes manifestaciones clĂnicas con morbimortalidad significativa. Su detecciĂłn es importante para implementar el tratamiento sin demora. Hay inhibidores especĂficos (bloquean funciĂłn), contra todos los factores de la coagulaciĂłn y ademĂĄs VWF, o de interferencia (afectan una o varias vĂas de la coagulaciĂłn). Los inhibidores especĂficos son alo-anticuerpos desarrollados en pacientes deficitarios (complicaciĂłn terapĂ©utica) o auto-anticuerpos presentes en individuos sin alteraciones previas. Hay anticuerpos especĂficos que pueden afectar la depuraciĂłn pero no inhiben funciĂłn. Inhibidores de interferencia: inmunoglobulinas u otras sustancias (heparina/heparinoides, PDF/pdf, PIVKAS, molĂ©culas anĂłmalas, etc.) asociadas a diferentes situaciones clĂnicas (asintomĂĄticos, sangrados, trombosis y/o complicaciones obstĂ©tricas). El laboratorio es fundamental para el diagnĂłstico. Las pruebas globales detectan el defecto, que no corrigen por el agregado de plasma normal; se caracteriza luego el tipo de inhibidor y eventualmente se titula. Esto es complejo; hay variabilidad en los resultados y posibilidad de falsos positivos o negativos, ademĂĄs las pruebas no son estrictamente especĂficas. Los algoritmos diagnĂłsticos son Ăștiles, pero no contemplan la posibilidad de defectos combinados. Es crĂtico caracterizar al inhibidor y descartar posibles interferencias o defectos concomitantes; ello requiere aplicar las pruebas adecuadas e interpretarlas correctamente.Os inibidores adquiridos sĂŁo defeitos raros. Associam-se a diferentes manifestaçÔes clĂnicas com morbimortalidade significativa. Sua detecção Ă© importante para implementar o tratamento sem demora. HĂĄ inibidores especĂficos (bloqueiam função), contra todos os fatores da coagulação e tambĂ©m VWF, ou de interferĂȘncia (afetam uma ou vĂĄrias vias da coagulação). Inibidores especĂficos: - aloanticorpos desenvolvidos em pacientes deficitĂĄrios (complicação terapĂȘutica); - autoanticorpos, em indivĂduos sem alteraçÔes prĂ©vias. Existem anticorpos especĂficos que podem afetar a depuração, mas nĂŁo inibem função. Inibidores de interferĂȘncia: imunoglobulinas ou outras substĂąncias (heparina/heparinoides, PDF/pdf, PIVKAS, molĂ©culas anĂŽmalas, etc.) associadas a diferentes situaçÔes clĂnicas (assintomĂĄticos, sangramentos, tromboses e/ou complicaçÔes obstĂ©tricas). O laboratĂłrio Ă© fundamental para o diagnĂłstico. Os testes globais detectam o defeito, que nĂŁo corrige pelo acrĂ©scimo de plasma normal; caracteriza-se depois o tipo de inibidor e eventualmente Ă© titulado. Isto Ă© complexo; hĂĄ variabilidade nos resultados e possibilidade de falsos positivos ou negativos, alĂ©m disso os testes nĂŁo sĂŁo rigorosamente especĂficos. Os algoritmos diagnĂłsticos sĂŁo Ășteis, mas nĂŁo consideram a possibilidade de defeitos combinados. Ă crĂtico caracterizar o inibidor e descartar possĂveis interferĂȘncias ou defeitos concomitantes; isso requer aplicar os testes adequados e interpretĂĄ-los corretamente.Fil: Remotti, Lucia. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Grosso, Silvia HaydĂ©e. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Ingratti, Marcelo Francisco. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Morandini, Maria Paula. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Meschengieser, Carolina. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Blanco, Alicia Noemi. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; Argentin
BiologĂa molecular en la enfermedad de von Willebrand: estado actual y perspectivas.
El factor von Willebrand (VWF) es una glicoproteĂna que se sintetiza en cĂ©lulas endoteliales (CE) y en megacariocitos. La estructura primaria del VWF estĂĄ constituida por un monĂłmero que, a travĂ©s de dimerizaciĂłn y multimerizaciĂłn, forma multĂmeros de diferente peso molecular, pequeños (LMWM), intermedios (IMWM), grandes (HMWM) y extra grandes (ULMWM), algunos con un tamaño mayor a 15 x 103 kDa.Fil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Kempfer, Ana Catalina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Paiva Palomino, Juvenal HernĂĄn. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentina. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentin
Lupus anticoagulant in patients without thrombotic or obstetric complications
El inhibidor lĂșpico (IL) es un criterio de laboratorio para sĂndrome antifosfolipĂdico (SAF); sin embargo, puede detectarse en individuos asintomĂĄticos o estar asociado a otras situaciones clĂnicas. Presentamos un anĂĄlisis retrospectivo de 2000 exĂĄmenes consecutivos para IL (TTPA, DRVVT), de los cuales 499 casos no presentaban criterios clĂnicos de SAF (trombosis o complicaciones obstĂ©tricas). Aplicando los criterios SSC-ISTH, hallamos IL+ en 27,3% (410/1501) y 43,3% (216/499) de los casos con y sin clĂnica de SAF respectivamente, analizĂĄndose en los casos no-SAF las caracterĂsticas clĂnicas y de laboratorio. Contexto clĂnico de casos IL+ no-SAF: 18,0% asintomĂĄticos, 34,3% sangrado (epistaxis, gingivorragia, equimosis, hematomas espontĂĄneos) y 47,7% otras manifestaciones (infertilidad, insuficiencia renal crĂłnica, desĂłrdenes autoinmunes, cardiopatĂa isquĂ©mica, trombocitopenia inmune, entre otras). Otras alteraciones de laboratorio en casos IL+ no- SAF, con sĂntomas de sangrado: alteraciones plaquetarias, descenso de VWF:RCo y/o VWF:Ag, disthrombocytopeminuciĂłn de FVIII, FII, FV, FVII, FXI o fibrinĂłgeno (sĂłlo o sumado a disminuciĂłn de plaquetas o FX), inhibidor a-FV o hiperfibrinolisis fueron detectadas en el 55,4% de los casos. El anĂĄlisis mostrĂł IL+ en un nĂșmero importante de estudios (216/2000) sin criterios de SAF (1,95% en individuos asintomĂĄticos, 3,70% en pacientes con sĂntomas de sangrado y 5,15% en casos con otro contexto clĂnico). Los casos con IL+ y sangrado representan un desafĂo particular, al requerir evaluar otros posibles defectos subyacentes, que pudiesen justificar el comportamiento clĂnico. La detecciĂłn e identificaciĂłn de defectos combinados requiere de un anĂĄlisis minucioso, a fin de alcanzar un diagnĂłstico correcto, esencial para tomar decisiones terapĂ©uticas adecuadas.Despite lupus anticoagulant (LA) is a laboratory criterion for antiphospholipid syndrome (APS), it can be present in asymptomatic subjects or it can be associated with other clinical settings. We present a retrospective analysis of 2000 consecutive LA assays (APTT, DRVVT), 499 of them were performed in patients without APS clinical criteria (thrombosis or obstetric complications). According to SSC-ISTH criteria, LA+ was found in 27.3% (410/1501) and 43.3% (216/499) of cases with or without APS criteria respectively; in no-APS group, the analysis of clinical background and laboratory features was done. Clinical background of LA+ cases no-APS: 18.0% asymptomatic, 34.3% bleeding symptoms (epistaxis, gingivorrhagia, bruising, spontaneous hematomas) and 47.7% other clinical settings (infertility, chronic kidney disease, autoimmune disorders, ischemic heart disease, idiopathic thrombocytopenic purpura, among others). Other abnormal laboratory tests in LA+ cases no- APS with bleeding symptoms: platelet dysfunction; low VWF:RCo and/or VWF:Ag; decrease of FVIII, FII, FV, FVII, FXI or fibrinogen (alone or with low platelet count or low FX), a-FV inhibitor and hyperfibrinolysis were found in the 55.4% of the cases. The analysis showed LA+ in an important number of cases (216/2000) without APS criteria (1.95% in asymptomatic cases, 3.70% in patients with bleeding symptoms and 5.15% in cases with other clinical settings). Those LA+ cases with bleeding symptoms represent a particular challenge because other possible underlying defects have to be analysed in order to explain the clinical behaviour. The detection and identifications of combined defects required a careful analysis in order to achieve an accurate diagnosis, essential for therapeutic decisions.Fil: Remotti, L.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Grosso, S. H.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Ingratti, M. F.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Vera Morandini, Maria Paula. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Woods, Adriana InĂ©s. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Bermejo, E. I.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: SĂĄnchez Luceros, AnalĂa Gabriela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; Argentina. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Meschengieser, S. S.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; ArgentinaFil: Lazzari, MarĂa Ăngela. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Medicina Experimental. Academia Nacional de Medicina de Buenos Aires. Instituto de Medicina Experimental; ArgentinaFil: Blanco, A. N.. Academia Nacional de Medicina de Buenos Aires. Instituto de Investigaciones HematolĂłgicas ; Argentin
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Prevalence, associated factors and outcomes of pressure injuries in adult intensive care unit patients: the DecubICUs study
Funder: European Society of Intensive Care Medicine; doi: http://dx.doi.org/10.13039/501100013347Funder: Flemish Society for Critical Care NursesAbstract: Purpose: Intensive care unit (ICU) patients are particularly susceptible to developing pressure injuries. Epidemiologic data is however unavailable. We aimed to provide an international picture of the extent of pressure injuries and factors associated with ICU-acquired pressure injuries in adult ICU patients. Methods: International 1-day point-prevalence study; follow-up for outcome assessment until hospital discharge (maximum 12 weeks). Factors associated with ICU-acquired pressure injury and hospital mortality were assessed by generalised linear mixed-effects regression analysis. Results: Data from 13,254 patients in 1117 ICUs (90 countries) revealed 6747 pressure injuries; 3997 (59.2%) were ICU-acquired. Overall prevalence was 26.6% (95% confidence interval [CI] 25.9â27.3). ICU-acquired prevalence was 16.2% (95% CI 15.6â16.8). Sacrum (37%) and heels (19.5%) were most affected. Factors independently associated with ICU-acquired pressure injuries were older age, male sex, being underweight, emergency surgery, higher Simplified Acute Physiology Score II, Braden score 3 days, comorbidities (chronic obstructive pulmonary disease, immunodeficiency), organ support (renal replacement, mechanical ventilation on ICU admission), and being in a low or lower-middle income-economy. Gradually increasing associations with mortality were identified for increasing severity of pressure injury: stage I (odds ratio [OR] 1.5; 95% CI 1.2â1.8), stage II (OR 1.6; 95% CI 1.4â1.9), and stage III or worse (OR 2.8; 95% CI 2.3â3.3). Conclusion: Pressure injuries are common in adult ICU patients. ICU-acquired pressure injuries are associated with mainly intrinsic factors and mortality. Optimal care standards, increased awareness, appropriate resource allocation, and further research into optimal prevention are pivotal to tackle this important patient safety threat
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Correction to: Prevalence, associated factors and outcomes of pressure injuries in adult intensive care unit patients: the DecubICUs study
The original version of this article unfortunately contained a mistake