Author(s): de Vries JI, van Pampus MG, Hague WM, Bezemer PD, Joosten JH FRUIT Invest, de Vries JI, van Pampus MG, Hague WM, Bezemer PD, Joosten JH FRUIT Invest
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Abstract BACKGROUND: Early-onset hypertensive disorders (HD) of pregnancy and small-for-gestational age infants (SGA) are associated with placental vascular thrombosis, these often recur and are also associated with inheritable thrombophilia. Aspirin reduces the recurrence risk. OBJECTIVES: Adding low-molecular-weight heparin (LMWH) to aspirin at < 12 weeks gestation reduces the recurrence of HD in women with previous early-onset HD (pre-eclampsia, hemolysis, elevated liver enzymes and low platelets [HELLP] syndrome and eclampsia) and/or SGA, in the context of inheritable thrombophilia without antiphospholipid antibodies. PATIENTS/METHODS: In a multicenter randomized control trial (RCT), 139 women included were< 12 weeks gestation. INCLUSION CRITERIA: previous delivery< 34 weeks gestation with HD and/or SGA; inheritable thrombophilia (protein C deficiency, protein S deficiency, activated protein C resistance, factor V Leiden heterozygosity and prothrombin gene G20210A mutation heterozygosity); and no antiphospholipid antibodies detected. INTERVENTION: either daily LMWH (dalteparin, 5000 IU weight-adjusted dosage) with aspirin 80 mg or aspirin 80 mg alone. MAIN OUTCOME MEASURES: PRIMARY OUTCOMES: recurrent HD onset (i) < 34 weeks gestation and (ii) irrespective of gestational age. SECONDARY OUTCOMES: recurrent SGA, preterm birth, maternal/neonatal hospitalization, spontaneous abortion and individual HD. Analysis by intention-to-treat. RESULTS: Low-molecular-weight heparin with aspirin reduced recurrent HD onset < 34 weeks gestation (risk difference [RD] 8.7\%: confidence interval [CI] of RD 1.9–15.5\%; P = 0.012; number needed to treat [NNT] 12). Recurrent HD irrespective of gestational age was not different between the arms. No women withdrew as a result of adverse effects. TRIAL REGISTRATION: http://www.isrctn.org) (isrctn87325378). CONCLUSIONS: Adding LMWH to aspirin at < 12 weeks gestation reduces recurrent HD onset < 34 weeks gestation in women with inheritable thrombophilia and prior delivery for HD/SGA <34 weeks. However, close monitoring of the mother and fetus remains important throughout pregnancy.
This article was published in J Thromb Haemost
and referenced in Journal of Blood Disorders & Transfusion