• Lucia Rugeri, Stephanie Desage, Linda Khouatra, Catherine Battie, Muriel Doret-Dion, Christine Trzeciak, and Yesim Dargaud.
• Clinical Haemostasis Unit, Louis Pradel Cardiological University Hospital.
• Blood Coagul. Fibrinolysis. 2020 Jan 1; 31 (1): 55-59.

Abstract: The risk of pregnancy-related venous thromboembolism is high in patients with inherited thrombophilia. The aim of this study was to compare the risk of pregnancy related-venous thromboembolism of women with protein C (PC) deficiency to patients with heterozygous factor V Leiden mutation. 145 consecutive pregnant women with confirmed PC deficiency or heterozygous factor V Leiden mutation were prospectively enrolled in the study. Lyon venous thromboembolism-risk score was used to individually tailor antithrombotic prophylaxis. The use of a validated clinical score presents the advantage to have a homogenous management of the venous thromboembolism risk in patients having similar risk factors. 53 pregnancies with PC deficiency were compared with 190 pregnancies in heterozygous factor V Leiden mutation carriers. 50% of the patients with PC deficiency and 64% of the heterozygous factor V Leiden mutation carriers were asymptomatic. According to the Lyon-venous thromboembolism risk score, 50% of patients with PC deficiency and 51% of heterozygous factor V Leiden carriers did not received any antepartum heparin prophylaxis. 34 and 37% of patients respectively received heparin prophylaxis during the third trimester only. No venous thromboembolism was observed in patients with PC deficiency and one postpartum venous thromboembolism occurred in a patient with heterozygous factor V Leiden. In the absence of randomized controlled clinical studies, we report here a large prospective series of pregnant women with PC deficiency. In our cohort, no difference of outcome, in terms of venous thromboembolism, was observed between pregnant women with PC deficiency and those with heterozygous factor V Leiden. Based on our results, low-molecular-weight heparin prophylaxis should not be mandatory in all pregnant women with PC deficiency. Similar prophylaxis strategies may be applied to women with factor V Leiden mutation or PC deficiency.

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