Obstetric antiphospholipid antibody syndrome

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Obstetric antiphospholipid antibody syndrome

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  • Benha University Hospital Email: elnashar53@hotmail.com Aboubakr Elnashar
  • An acquired autoimmune disorder characterized by -moderate to high levels of antiphospholipid antibodies (LA or aCl or a-2GPI) & -specific clinical features (arterial or venous thrombosis or pregnancy morbidity) (Miyakis et al, 2006) 20 antibodies First description: 1983 (Graham Hughes) Aboubakr Elnashar
  • Primary: 50% other features of connective tissue disease are absent Secondary: 50% to connective tissue disease e.g. SLE Aboubakr Elnashar
  • Epidemiology General population: 2-4%. increases with age and chronic disease Recurrent fetal loss: 15 % SLE: 30% aCL antibodies: more common than LA (aCL 5X more than LA) Aboubakr Elnashar
  • 1. Recurrent pregnancy loss. 25%. Majority: in 1st T after the establishment of FHR activity. 15% of RPL 2. Preeclampsia: 15-50%. 15% of severe PET before 34 w have APL Ab 3. IUGR: 30% 4. Preterm labor 5. Maternal thrombosis (including strokes) Aboubakr Elnashar
  • Mechanisms 1. Inhibition of trophoblastic function& differentiation (Bose et al, 2005) 2. Activation of complement pathways at the maternalfetal interface: local inflammatory response (Salmon et al, 2003) 3. In later pregnancy, thrombosis of the uteroplacental vasculature (Peaceman et al, 1993). neither universal nor specific (Jivraj & Rai, 2003) Aboubakr Elnashar
  • Controversy. aPl is responsible for implantation failure. aPL is 23% in females referred for IVF Vs 2% in fertile females (Chilcott et al,2000) Routine screening for aPL among women undergoing IVF-ET is not warranted (Branch et al,2003) Aboubakr Elnashar
  • Postpartum syndrome Rare Manifestations Pleuropulmonary disease Fever Cardiac manifestations Mechanism Unknown extensive Img and C3 deposition in myocardium Aboubakr Elnashar
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  • Sydney clinical criteria for APS (2006) At least 1 clinical and 1 laboratory criterion. Not if there is 5 years between +ve aPLab and the clinical manifestation Aboubakr Elnashar
  • I. Clinical 1. Vascular thrombosis One or more clinical episodes of arterial, venous, or small-vessel thrombosis in any tissue or organ confirmed by imaging, Doppler studies, or histopathology, with the exception of superficial venous thrombosis. For histopathologic confirmation, thrombosis should be present without significant evidence of inflammation of the vessel wall. Aboubakr Elnashar
  • 2. Pregnancy morbidity (a) One or more unexplained deaths of a morphologically normal fetus at or beyond the 10th w, with normal fetal morphology documented by US or by direct examination of the fetus, or (b) One or more premature births of a morphologically normal neonate at or before the 34th w because of severe preeclampsia or eclampsia or severe placental insufficiency, or (c) Three or more unexplained consecutive spontaneous abortions before the 10th w, with maternal anatomic or hormonal abnormalities and paternal and maternal chromosomal causes excluded. N.B: in practice evaluation after 2 early miscarriage Aboubakr Elnashar
  • 2. Comparison of laboratory criteria of APS. Test Sapporo criteria (1999) Sydney criteria (2006) LACs Screening, mixing, and confirmation tests Two or more occasions at least 6 w Apart Screening, mixing, and confirmation tests Two or more occasions at least 12 w Apart aCL Ab Detected by standardized ELISA IgG and/or IgM Medium or high titer Two or more occasions at least 6 w apart Detected by standardized ELISA IgG and/or IgM Medium or high titer (>40 units titer or >99th percentile) Two or more occasions at least 12 w apart Anti- 2GPI Ab IgG and/or IgM Titer >99th percentile Two or more occasions at least 12 weeks apart Aboubakr Elnashar
  • Interpretation: A repeat tests at least 6 (12) W apart. {Individuals may have transiently positive test because a low to mid positive level can be due to viral illness and revert to normal& those with an initial negative test may be in the transient negative phase of their aPL cycle.} LA, aCL and a2GPI testing are all required for the accurate diagnosis Once APS is diagnosed, serial aPL testing is not useful Aboubakr Elnashar
  • LA: positive or negative more specific. aCL: international units. more sensitive Titer is related to risk of fetal loss (Rai et al,1995) IgG Ab more specific than IgM. better predictors of fetal outcome (Lockwood et al,1986) -IgA -no greater risk (Silver et al 1996). Aboubakr Elnashar
  • laboratory data-based classification system International Consensus Guidelines, 2006 Category Criteria I More than 1 laboratory criterion present in any combination IIa LA present, only IIb aCL present, only IIc anti-2GPI present, only Aboubakr Elnashar
  • Controversial points in interpreting -Low positive IgG AcL Ab: No greater risk for APA related events (Silver et al, 1996). should be regarded as of questionable clinical significance (Branch et al,2003) should be included in the diagnosis of obstetric APS. (Gardiner et al, 2013) Aboubakr Elnashar
  • Obstetric indications: 1. Unexplained stillbirth 2. Recurrent pregnancy loss 3.Unexplained 2nd or 3rd T fetal death 4. IUGR 5. Severe preeclampsia at less than 34 w. 6. Placental abruption (previous or current) Aboubakr Elnashar
  • .Non-obstetric indication 1.False positive serologic test for syphilis 2.Autoimmune diseases: SLE, thrombocytopenia 3.Unexplained thrombosis 4.Haemolytic anaemia 5.Stroke, especially between 25-50 yr 6.Livedo reticularis Livedo reticularis Aboubakr Elnashar
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  • A. Before pregnancy: Pre-conceptional counseling 1. Clinical: review med and obs history, asses other risk factors, obesity, age 2. Lab: Confirm persistent aPLab Assess R function CBC: anaemia thrompocytopenia 3. Treatment Postpone pregnancy if thrombotic event