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https://www.readbyqxmd.com/read/28804830/solid-phase-immunoassay-for-the-detection-of-anticardiolipin-antibodies
#1
Rohan Willis, Elizabeth Papalardo, E Nigel Harris
The anticardiolipin (aCL) test was first developed in the 1980s and proved to be a valuable addition to the lupus anticoagulant assay for identifying patients with a disorder that came to be later known as the antiphospholipid syndrome (APS). Although the test has relatively poor specificity for APS diagnosis, particularly at low positive levels, it has continued to play a major role in the identification and management of these patients because of its high sensitivity and ability to be measured in both serum and plasma, and despite concomitant presence of anticoagulants normally given to APS patients...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804829/lupus-anticoagulant-testing-activated-partial-thromboplastin-time-aptt-and-silica-clotting-time-sct
#2
Armando Tripodi, Veena Chantarangkul
Actvated partial thromboplastin time and its congener test Silica clotting time are used for the laboratory detection of lupus anticoagulants. Their performance consists of mixing test plasma with activators of the contact coagulation factors, phospholipids and calcium chloride, and recording the clotting time. Here we describe the principle, performance and extensive practical details of the two methods, the problems that may be encountered and how they can be identified and overcome.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804828/lupus-anticoagulant-testing-diluted-russell-viper-venom-time-drvvt
#3
Vittorio Pengo, Elisa Bison, Alessandra Banzato, Giacomo Zoppellaro, Seena Padayattil Jose, Gentian Denas
Diluted Russell Viper Venom Time (dRVVT) has become the most popular test to detect Lupus Anticoagulant (LA). dRVVT is more sensitive than other global tests employed to detect LA and is not affected by inhibitors of factor VIII or IX. The test is most successfully implemented if you observe three steps in its execution: screening, mixing, and confirmatory studies. Interference due to the presence of heparin in tested plasma must be excluded by means of thrombin time (TT). The prior use of Vitamin K Antagonists (VKAs) or Non-vitamin K Oral Anticoagulants (NOACs) must also be evaluated by means of International Normalized Ratio, or specific tests, respectively...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804819/performance-of-activated-partial-thromboplastin-time-aptt-determining-reagent-sensitivity-to-factor-deficiencies-heparin-and-lupus-anticoagulants
#4
Geoffrey Kershaw
The activated partial thromboplastin time (APTT) is a useful global assay for the assessment of the contact factor pathway of hemostasis and its inhibitors. The test is usually performed on fully automated analyzers using commercially prepared reagents. The three main clinical areas of interest are detection of factor deficiencies, detection of lupus anticoagulants and in the monitoring of therapy with unfractionated heparin. Methods are described here for assessing APTT reagents for their sensitivity to clotting time prolongation in each of these areas of interest...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28803708/anti-phospholipid-syndrome-current-opinion-on-mechanisms-involved-laboratory-characterization-and-diagnostic-aspects
#5
REVIEW
Jean Amiral, Marie Peyrafitte, Claire Dunois, Anne Marie Vissac, Jerard Seghatchian
Anti-phospholipid syndrome is a complex and severe clinical situation, associated with symptoms such as recurrent thrombosis, arterial or venous, at any site, pregnancy loss, and other related syndromes. These clinical burdens, are highly variable from patient to patient, and are associated with biological abnormalities, such as the presence of the Lupus Anticoagulant or phospholipid dependent antibodies, confirmed on two occasions at least 12 weeks apart. From the diagnosis standpoint, both, functional (clotting) or immunological assays, are difficult to standardize and to optimize, due to the absence of reference material, or a characteristic clinical group, and international reference preparations...
July 15, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28774823/a-joint-narrative-on-methodological-standardization-aspects-of-the-lupus-anticoagulant-and-erythrocyte-based-drug-delivery-in-transfusion-medicine
#6
EDITORIAL
Jerard Seghatchian
No abstract text is available yet for this article.
July 15, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28770876/assessment-of-the-underlying-causes-of-the-immune-thrombocytopenia-ten-years-experience
#7
Mehmet Sinan Dal, Abdullah Karakus, Tuba Dal, Berrin Balik Aydin, Elif Hattapoglu, Mehmet Onder Ekmen, Turgay Ulas, Orhan Ayyildiz
OBJECTIVE: Immune thrombocytopenia (ITP) is an immune haematologic disorder causing platelet destruction mediated by anti-platelet antibodies. In this study we aimed to evaluate the clinical and laboratory variables of ITP patients in southeast of Turkey. METHODS: In this retrospective study 167 ITP patients between 2005 and 2015 were evaluated. All patients were screened for immunological parameters including ANA (antinuclear antibodies), anti dsDNA (anti-double-stranded-DNA), ACA(anti-cardiolipin) IgM and IgG, LA (lupus anticoagulants)...
July 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28769114/diagnosing-antiphospholipid-syndrome-extra-criteria-manifestations-and-technical-advances
#8
REVIEW
Savino Sciascia, Mary-Carmen Amigo, Dario Roccatello, Munther Khamashta
First described in the early 1980s, antiphospholipid syndrome (APS) is a unique form of acquired autoimmune thrombophilia in which patients present with clinical features of recurrent thrombosis and pregnancy morbidity and persistently test positive for the presence of antiphospholipid antibodies (aPL). At least one clinical (vascular thrombosis or pregnancy morbidity) and one lab-based (positive test result for lupus anticoagulant, anticardiolipin antibodies and/or anti-β2-glycoprotein 1 antibodies) criterion have to be met for a patient to be classified as having APS...
August 3, 2017: Nature Reviews. Rheumatology
https://www.readbyqxmd.com/read/28762061/direct-antiglobulin-coombs-test-in-systemic-lupus-erythematosus-patients
#9
Thelma Skare, Leandro Picelli, Thiago Alberto G Dos Santos, Renato Nisihara
The objective of the study is to study the positivity of Coombs test or direct antiglobulin test (DAT) in systemic lupus erythematosus (SLE) patients and its relationship with disease's clinical and serological profile. Retrospective study of 373 SLE patients seen at single Rheumatology Unit. Epidemiological data (age, gender, age at disease onset, auto declared ethnic background and tobacco use), clinical (malar rash, photosensitivity, oral ulcers, discoid lesions, serositis, glomerulonephritis, convulsions, psychosis, hemolytic anemia, leukopenia, lymphocytopenia and arthritis), and serological profile (anti ds DNA, anti Ro/SS-A; anti La/SS-B, Anti RNP, Anti Sm, aCl (anticardiolipin) IgG, aCl Ig M, LA or lupus anticoagulant, rheumatoid factor and direct Coombs) were collected...
July 31, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28755727/plasma-antiphospholipid-antibodies-effects-on-activated-partial-thromboplastin-time-assays
#10
Ke Yao, Lingyun Zhang, Hang Zhou, Ning Tang, Dengju Li
BACKGROUND: Activated partial thromboplastin time (aPTT) assays can be affected by plasma antiphospholipid antibodies (aPLs), but the degree of the interference is not easy to predict. This study aimed to investigate the effects on aPTT assay results of different types and combinations of aPLs, including anti-β2-glycoprotein I antibodies, anticardiolipin antibodies and lupus anticoagulant. MATERIALS AND METHODS: We retrospectively collected clinical information and laboratory tests from aPL-positive patients...
July 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28748519/obstetric-antiphospholipid-syndrome-and-long-term-arterial-thrombosis-risk
#11
Genady Drozidnsky, Eran Hadar, Anat Shmueli, Rinat Gabbay-Benziv, Shachaf Shiber
Antiphospholipid syndrome (APS) is classified as the association of a thrombotic event and/or obstetric morbidity in patients persistently positive for antiphospholipid antibodies and/or lupus anticoagulant. To evaluate the incidence of subsequent thrombosis among women diagnosed with purely obstetric APS. We retrospectively reviewed and collected demographic and clinical data from the computerized charts of all patients with obstetric APS, from 1992 to 2017. Eligibility criteria included all women diagnosed with APS, according to the 2006 revised criteria, for whom the clinical manifestations were purely obstetric...
July 26, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/28748509/clinical-characteristics-and-thrombosis-outcomes-of-paediatric-antiphospholipid-syndrome-analysis-of-58-patients
#12
Jingran Ma, Hongmei Song, Min Wei, Yanyan He
The study aims to analyse the clinical and immunological manifestations of paediatric antiphospholipid syndrome (APS) in patients, based on the 2006 revised classification criteria of definite APS. Fifty-eight paediatric patients with APS were enrolled and analysed retrospectively. A total of 37 female and 21 male patients with a mean age of 14 ± 3 years at disease onset were included. Fourteen (24%) cases were primary APS, and 40 (69%) cases were secondary to systemic lupus erythaematosus (SLE). Anti-nuclear antibody (ANA) positivity and hypocomplementemia were more common in secondary APS than in primary APS...
July 26, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28740966/portal-vein-thrombosis-as-a-rare-cause-of-abdominal-pain-when-to-consider
#13
Cengiz Tavusbay, Erdinç Kamer, Turan Acar, İbrahim Kokulu, Haldun Kar, Özlem Gür
Extrahepatic portal vein thrombosis (PVT) is a rare condition that is characterized by the presence of thrombus within any segment of the portal vein, including the right and left intrahepatic branches. It may also extend to the splenic or superior mesenteric veins. Portal vein thrombosis may be related to cirrhosis or liver malignancy as well as to local inflammatory conditions in the abdomen and genetic or acquired thrombophilic diseases. Currently, PVT is being increasingly diagnosed due to advances in modern imaging techniques...
2017: Turk J Surg
https://www.readbyqxmd.com/read/28727732/incidence-of-thromboembolic-events-in-asymptomatic-carriers-of-iga-anti-%C3%A3-2-glycoprotein-i-antibodies
#14
Carlos Tortosa, Oscar Cabrera-Marante, Manuel Serrano, José A Martínez-Flores, Dolores Pérez, David Lora, Luis Morillas, Estela Paz-Artal, José M Morales, Daniel Pleguezuelo, Antonio Serrano
BACKGROUND: The antiphospholipid syndrome (APS) is defined by simultaneous presence of vascular clinical events and antiphospholipid antibodies (aPL). The aPL considered as diagnostics are lupus anticoagulant and antibodies anticardiolipin (aCL) and anti-ß2 glycoprotein-I (aB2GP1). During recent years, IgA aB2GP1 antibodies have been associated with thrombotic events both in patients positive, and mainly negative for other aPL, however its value as a pro-thrombotic risk-factor in asymptomatic patients has not been well defined...
2017: PloS One
https://www.readbyqxmd.com/read/28711993/clinical-risk-assessment-in-the-antiphospholipid-syndrome-current-landscape-and-emerging-biomarkers
#15
REVIEW
Shruti Chaturvedi, Keith R McCrae
PURPOSE OF REVIEW: Laboratory criteria for the classification of antiphospholipid syndrome include the detection of a lupus anticoagulant and/or anticardiolipin and anti-β2-glycoprotein I antibodies. However, the majority of patients who test positive in these assays do not have thrombosis. Current risk-stratification tools are largely limited to the antiphospholipid antibody profile and traditional thrombotic risk factors. RECENT FINDINGS: Novel biomarkers that correlate with disease activity and potentially provide insight into future clinical events include domain 1 specific anti-β2GPI antibodies, antibodies to other phospholipids or phospholipid/protein antigens (such as anti-PS/PT), and functional/biological assays such as thrombin generation, complement activation, levels of circulating microparticles, and annexin A5 resistance...
July 2017: Current Rheumatology Reports
https://www.readbyqxmd.com/read/28711073/lupus-nephritis-and-pregnancy-concerns-and-management
#16
Liz Lightstone, Michelle A Hladunewich
Pregnancy associated with lupus, especially lupus nephritis, is often fraught with concern for both the mother and fetus. Thus, it is paramount that care begins preconception so that proper planning in terms of optimizing the medical regimen, discontinuation of fetotoxic agents, and treatment of active disease can occur. It is well known that active nephritis at the time of conception is associated with poor outcomes. Even with quiescent disease, recent data indicate that being lupus anticoagulant-positive, nonwhite or Hispanic, and using antihypertensive medications were all predictors of worse pregnancy outcomes...
July 2017: Seminars in Nephrology
https://www.readbyqxmd.com/read/28695380/macular-capillary-recovery-in-systemic-lupus-erythematosus-complicated-by-kikuchi-fujimoto-disease
#17
Reiko Kinouchi, Motoshi Kinouchi, Akihiro Ishibazawa, Akitoshi Yoshida
PURPOSE: Few case reports have described vaso-occlusive retinopathy in systemic lupus erythematosus (SLE) using optical coherence tomography (OCT) angiography. Here we report the clinical features of a patient with SLE, complicated by Kikuchi-Fujimoto disease, who developed vaso-occlusive retinopathy. We then describe the subsequent recovery of the macular capillaries as assessed by OCT angiography. CASE: A 16-year-old male was referred to us with fever, a 1-month history of violaceous red papules and erythematous plaques on his face and a painful nodule in his right neck...
July 10, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28649180/procoagulatory-changes-induced-by-head-up-tilt-test-in-patients-with-syncope-observational-study
#18
Viktor Hamrefors, Artur Fedorowski, Karin Strandberg, Richard Sutton, Nazim Isma
BACKGROUND: Orthostatic hypercoagulability is proposed as a mechanism promoting cardiovascular and thromboembolic events after awakening and during prolonged orthostasis. We evaluated early changes in coagulation biomarkers induced by tilt testing among patients investigated for suspected syncope, aiming to test the hypothesis that orthostatic challenge evokes procoagulatory changes to a different degree according to diagnosis. METHODS: One-hundred-and-seventy-eight consecutive patients (age, 51 ± 21 years; 46% men) were analysed...
2017: Thrombosis Journal
https://www.readbyqxmd.com/read/28647939/non-criteria-or-seronegative-obstetric-antiphospholipid-syndrome
#19
REVIEW
Luis J Jara, Gabriela Medina, Polita Cruz-Cruz, Javier Olivares-Rivera, Carolina Duarte-Salazar, Miguel A Saavedra
Obstetric antiphospholipid syndrome (Obs-APS) is one of the most commonly identified causes of recurrent pregnancy loss and its accurate diagnosis is a requirement for optimal treatment. Some patients do not fulfill the revised Sapporo classification criteria, the original APS classification criteria, and are considered to be non-criteria Obs-APS. In these patients with non-criteria, there is controversy about their inclusion within the spectrum of APS and eventually their treatment as having Obs-APS. A subset of patients may also have clinical characteristics of Obs-APS even though lupus anticoagulant (LA), anticardiolipin antibodies, and anti-β2-glycoprotein I (aβ2GPI) antibodies are consistently negative...
June 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28640321/effects-of-direct-oral-anticoagulants-on-lupus-anticoagulant-assays-in-a-real-life-setting
#20
Aleksandra Antovic, Eva-Marie Norberg, Maria Berndtsson, Agnes Rasmuson, Rickard E Malmström, Mika Skeppholm, Jovan Antovic
Laboratory diagnosis of lupus anticoagulant (LA) is based on prolongation in at least one coagulation assay (diluted Russell's viper venom time - dRVVT or activated partial thromboplastin time - aPTT), which normalises after addition of phospholipids. Both assays may be influenced by anticoagulants and therefore LA should not be tested during warfarin or heparin treatment. It has been shown (primarily in vitro) that direct oral anticoagulants (DOACs - dabigatran [DAB], rivaroxaban [RIV] and apixaban [API]) may also influence LA testing...
June 22, 2017: Thrombosis and Haemostasis
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