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      Antiphospholipid Antibodies and Renal Involvement

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          Abstract

          Antiphospholipid antibodies are a heterogeneous group of autoantibodies associated with the hypercoagulable state affecting all vascular districts with thrombosis named antiphospholipid syndrome (APS). APS is an autoimmune disease with multifactorial etiology that includes cellular, molecular, genetic and pathogenic mechanisms. The APS clinical features are a combination of arterial and/or venous thrombosis, hematological events, recurrent fetal losses, neurological disorders and intra-abdominal manifestations. The renal involvement is associated with both primary and secondary APS. Clinical features include hypertension, renal artery stenosis, thrombotic microangiopathy and other histological manifestations of the nephropathy (APSN), venous renal thrombosis, APSN in the course of systemic lupus erythematosus and renal failure. APSN is an independent risk factor that should be included in the classification criteria for definite APS with characteristic clinical and histological features.

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          Most cited references28

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          Mortality in the catastrophic antiphospholipid syndrome: causes of death and prognostic factors in a series of 250 patients.

          To assess the main causes of death and the prognostic factors that influence mortality in patients with the catastrophic antiphospholipid syndrome (CAPS). We analyzed the case reports of 250 patients included in the CAPS Registry up to February 2005. To identify prognostic factors for CAPS, we compared the main clinical and immunologic features and the types of treatment in the patients who died with those features in the patients who survived. Recovery occurred in 56% of the episodes of CAPS and death occurred in 44%. Cerebral involvement, consisting mainly of stroke, cerebral hemorrhage, and encephalopathy, was considered the main cause of death, being present in 27.2% of patients, followed by cardiac involvement (19.8%) and infection (19.8%). The only factor we identified that was prognostic of a higher mortality rate was the presence of systemic lupus erythematosus (SLE). A higher recovery rate was associated with combined treatment with anticoagulants (ACs) plus corticosteroids (CS) plus plasma exchange (PE) (77.8%), followed by ACs plus CS plus PE and/or intravenous immunoglobulins (69%). In contrast, concomitant treatment with cyclophosphamide did not demonstrate additional benefit. Cerebral involvement (mainly consisting of stroke), cardiac involvement, and infections were considered the main causes of death in patients with CAPS. The presence of SLE was related to a higher mortality rate. According to the results of the present study, ACs plus CS plus PE should be the first line of therapy in patients with CAPS.
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            Management of antiphospholipid antibody syndrome: a systematic review.

            Antiphospholipid antibodies are autoantibodies directed against proteins that bind to phospholipid. Antiphospholipid antibody syndrome (APS) refers to the association between antiphospholipid antibodies and thrombosis risk or pregnancy morbidity. Patients with APS may be at increased risk of recurrent arterial or venous thrombosis or pregnancy loss. To systematically review the evidence for treatment of thrombosis risk in patients with antiphospholipid antibodies or APS. Search of MEDLINE (1966 to November 2005) and Cochrane Library electronic databases (2005) and reference lists for randomized trials, meta-analyses of randomized trials, and prospective cohort studies of the treatment of thrombosis risk in patients with antiphospholipid antibodies or APS. Studies were selected on the basis of clinical relevance. Among patients with antiphospholipid antibodies, the absolute risk of developing new thrombosis is low ( 10% in the first year) in patients with a history of venous thrombosis who have discontinued anticoagulant drugs within 6 months. Compared with placebo or untreated control, anticoagulation with moderate-intensity warfarin (adjusted to a target international normalized ratio [INR] of 2.0-3.0) reduces the risk of recurrent venous thrombosis by 80% to 90% irrespective of the presence of antiphospholipid antibodies and may be effective for preventing recurrent arterial thrombosis. No evidence exists that high-intensity warfarin (target INR, >3.0) is more effective than moderate-intensity warfarin. For patients with a single positive antiphospholipid antibody test result and prior stroke, aspirin and moderate-intensity warfarin appear equally effective for preventing recurrent stroke. Treatment issues that have not been addressed in clinical trials, or for which the evidence is conflicting, include the role of antithrombotic prophylaxis in patients with antiphospholipid antibodies without prior thrombosis, the optimal treatment of noncerebrovascular arterial thrombosis, recurrent thrombosis despite warfarin therapy, and treatment of women with antiphospholipid antibodies and recurrent fetal loss. In patients with APS, moderate-intensity warfarin is effective for preventing recurrent venous thrombosis and perhaps also arterial thrombosis. Aspirin appears to be as effective as moderate-intensity warfarin for preventing recurrent stroke in patients with prior stroke and a single positive test result for antiphospholipid antibody. The optimal treatment of other thrombotic aspects of APS needs to be addressed in well-designed prospective studies.
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              Infectious origin of the antiphospholipid syndrome.

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                Author and article information

                Journal
                AJN
                Am J Nephrol
                10.1159/issn.0250-8095
                American Journal of Nephrology
                S. Karger AG
                0250-8095
                1421-9670
                2009
                November 2009
                28 August 2009
                : 30
                : 5
                : 405-412
                Affiliations
                Departments of aNephrology, bClinical Medicine and cExperimental Medicine and Pathology, University of Rome La Sapienza, Rome, and dDepartment of Nephrology, University of Magna Graecia, Catanzaro, Italy
                Article
                235941 Am J Nephrol 2009;30:405–412
                10.1159/000235941
                19713697
                7262df7d-21bd-4af1-89c7-fc8b9f06e3f7
                © 2009 S. Karger AG, Basel

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                : 25 June 2009
                : 23 July 2009
                Page count
                Figures: 5, Tables: 2, References: 40, Pages: 8
                Categories
                In-Depth Topic Review

                Cardiovascular Medicine,Nephrology
                Antiphospholipid syndrome,Antiphospholipid antibodies,Antiphospholipid syndrome nephropathy,Systemic lupus erythematosus nephritis

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