Protean clinical presentation of antiphospholipid-protein antibodies (APA).

Abstract:

:Antiphospholipid-protein antibodies (APA) are a family of immunoglobulins which have been defined by varying laboratory test systems. Lupus anticoagulants (LA) and anticardiolipin antibodies (ACA) are the two most prominent members of this family of antibodies. LA are detected utilizing various phospholipid (PL) dependent tests of coagulation (e.g., activated partial thromboplastin time [APTT], Kaolin Clotting Time [KCT], dilute Russell Viper Venom Time [dRVVT]). Originally, LA were thought to be a laboratory nuisance since the vast majority of individuals with LA did not bleed. Paradoxically, patients with LA were found to have an increased incidence of thromboembolic events and also recurrent spontaneous abortions (RSA). Thus, the laboratory detection of LA has become part of the work up of patients with thromboembolic disorders and RSA. ACA are detected using solid phase assay systems (radioimmunoassay or ELISA). The presence of ACA has the same clinical implications as that of LA. Although originally it was suggested ACA and LA were the same antibody, it is now well accepted that they, in many instances, are different antibodies. Therefore, it is critical for laboratories to evaluate patient samples for both LA and ACA. In approximately 60% of circumstances, both antibodies will be found. In the remaining cases, there will be discordance between the two test systems. The question of whether APA are causative, coincidental, or a consequence of the clinical complications of RSA and thrombosis remains controversial. Recent evidence based on prospective clinical studies and analysis of markers of in vivo coagulation suggests APA are causative.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Thromb Haemost

authors

Triplett DA

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

329-37

issue

1

eissn

0340-6245

issn

2567-689X

journal_volume

74

pub_type

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