Association of hereditary thrombophilia with intrauterine growth restriction

BACKGROUND Intrauterine growth retardation (IUGR) contributes significantly to fetal morbidity and mortality, but its etiology is unknown in most cases. OBJECTIVE The aim of this study was to examine the association between inherited thrombophilia and IUGR. MATERIALS AND METHODS A case-control study was performed in a tertiary referral center (Afzalipour Hospital) over 2-years period (2010-2011). Cases (n=25) were women who had pregnancies complicated by IUDR and control subjects (n=25) were women who had normal growth fetuses. All women were tested for inherited thrombophilia at least 4 weeks after delivery. Main outcome measure was prevalence of maternal thrombophlia. Genotyping for factor V Leiden, prothrombin gene (nucleotide G20210A), and MTHFR (C677T) mutation was performed by PCR technique. Protein C, S and antithrombin III activity were determined with a clotting assay (STA-Staclot, France). RESULTS The prevalence of hereditary thrombophilia was 68% (n=17) in IUGR group, and 32% (n=8) in control group (OR: 1.5, p=0.011, 95% CI: 1.3-14.8). The frequency of MTHFR (C677T) gene mutation (p=0.037; OR: 3.69) and protein S deficiency (p=0.034; OR: 5.41) was significantly increased in the group with IUGR compared with the control group. There was no significant difference between the two groups in prothrombin G20210A mutation (p=0.490) and protein C deficiency (p=0.609). A significant difference in the frequency of multiple thrombophilias was detected between the two groups (p=0.009). CONCLUSION This study revealed that protein S deficiency and MTHFR gene mutation are more prevalent in pregnancies with IUGR.