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Pregnancy in essential thrombocythaemia: treatment and outcome of 17 pregnancies

Abstract: Objective: To evaluate treatment and outcome of 17 pregnancies in nine patients with essential thrombocythaemia (ET) seen at our institution from 1988 to 1998. Methods: Treatment and outcome of 17 pregnancies in nine ET patients were retrospectively analyzed. Results: Seventeen pregnancies in nine patients with ET resulted in 11 (65%) live births and ended in six (35%) spontaneous abortions. Abortion could not be predicted from ET‐associated complications before (p=0.23) or during (p=0.39) pregnancy. Maternal complications occured during six pregnancies (35%): Three major bleedings in two patients with an acquired von Willebrand disease and two minor bleedings in patients treated with low‐dose acetylsalicylic acid (ASA) were observed during pregnancy or at term; one patient suffered from transient visual loss while pausing low‐dose ASA. Platelet counts prior to pregnancy were significantly higher as compared to the platelet nadir observed during pregnancy (p=0.0017). Postpartum clinical course was uneventful in all patients. No specific treatment was given during 11 pregnancies. Six women received low‐dose ASA during pregnancy followed by low‐molecular‐weight heparin until the end of the sixth week postpartum in five cases. This treatment was correlated with a favourable outcome (live birth versus abortion) when compared to no treatment (p=0.04). Conclusion: Pregnancy in ET can be complicated by first trimester abortion and/or maternal haemorrhage. Our limited observation suggest a positive impact of low‐dose ASA during pregnancy followed by low‐molecular‐weight heparin postpartum on pregnancy outcome in ET; nevertheless, confirmation by prospective documentation is mandatory.