rss
Arch Dis Child Educ Pract Ed 98:52-57 doi:10.1136/archdischild-2012-302321
  • Interpretations

How to use… lupus anticoagulants

  1. A V Ramanan5
  1. 1Department of Paediatric Rheumatology, Great North Children's Hospital, Newcastle upon Tyne, UK
  2. 2Department of Women's and Children's Health, Institute of Translational Medicine (Child Health), University of Liverpool, Liverpool, UK
  3. 3Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
  4. 4Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Center Ljubljana, Ljubljana, Slovenia
  5. 5Department of Paediatric Rheumatology, Bristol Royal Hospital for Children, Bristol, UK
  1. Correspondence to Dr Ethan S Sen, Department of Paediatric Rheumatology, Great North Children's Hospital, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, UK; ethan.sen{at}doctors.org.uk
  • Accepted 2 September 2012
  • Published Online First 6 October 2012

Introduction

Lupus anticoagulants (LA) were first detected in patients with systemic lupus erythematosus (SLE) in 1952 by Conley and Hartmann.1 They identified patients in whom the activated partial thromboplastin time (APTT) was prolonged and which did not correct on the addition of normal plasma. Although Conley and Hartmann's original description was in association with a haemorrhagic disorder, subsequent reports from the 1960s highlighted patients with thrombotic events in the presence of LA.2 The term ‘lupus anticoagulant’ was introduced by Feinstein and Rapaport in 1972.3 It has, however, caused some confusion because LA tend to be procoagulant in vivo, and most people who test positive for LA do not meet criteria for a diagnosis of SLE.4

LA are a subset of antiphospholipid antibodies (aPL) which also include anticardiolipin antibodies (aCL) and anti-β2 glycoprotein-I (anti-β2GPI) antibodies among others. The clinical significance of these antibodies is their association with venous or arterial thrombosis, or recurrent fetal loss. This association constitutes the antiphospholipid antibody syndrome (APS) for which there are revised classification criteria published in 2006.5 Some features not included in the classification criteria are associated with APS and are more commonly seen in children than adults. These include immune-mediated thrombocytopenia, haemolytic anaemia, migraine, chorea and epilepsy.6

This paper aims to highlight which children should be tested for LA, and the significance of LA if they are detected.

Physiological background (what are LA and what do they do?)

LA are a mixture of different immunoglobulins (IgG and IgM) that bind to various protein-phospholipid complexes.4 Targets include β2GPI, prothrombin, protein C and S and factor XI among others.7 In common with other antibodies, LA are produced by B lymphocytes. In the context of SLE, there is a generalised increase in production of autoantibodies. The reasons for production of LA in other contexts are …

Responses to this article

Register for free content

Free sample
This recent issue is free to all users to allow everyone the opportunity to see the full scope and typical content of ADC Education & Practice.
View free sample issue >>

Don't forget to sign up for content alerts so you keep up to date with all the articles as they are published.

Navigate This Article