TRAnexamic Acid for Preventing Blood Loss Following a Cesarean Delivery in Women With Placenta pREVIA

Inclusion Criteria: * Age≥ 18 years * Placenta previa defined by a placental edge below 20mm from internal cervical os diagnosed at the most recent transvaginal ultrasound examination before delivery, as per French guidelines * Cesarean delivery before or during labor * Gestational age at delivery ≥ 32 weeks + 0 * Affiliated or beneficiary to a health security system * Signed informed consent Exclusion Criteria: * History of venous (deep vein thrombosis and/or pulmonary embolism) or arterial (angina pectoris, myocardial infarction, stroke) thrombotic event * History of epilepsy or seizure * Chronic or acute cardiovascular disease (including foramen oval, mitral stenosis, aortic stenosis, heart transplant, pulmonary hypertension); chronic or acute renal disease (including chronic or acute kidney failure with glomerular filtration rate \<90 mL/min, renal transplantation), chronic active or acute liver disorder with hemorrhagic or thrombotic risk (including cirrhosis, portal hypertension, Budd-Chiari syndrome) * Active autoimmune disease with thromboembolic risk (including lupus, antiphospholipid syndrome, Crohn's disease) * Sickle cell disease (homozygous) * Severe hemostasis disorder prothrombotic (Factor V Leiden mutation - homo or heterozygous; Activated protein C (APC) resistance, Protein C deficiency, Protein S deficiency - aside from pregnancy, Homocysteinemia, , Factor 2 mutation - homo or heterozygous, Deficiency in antithrombin 3), prohemorragic (von Willebrand disease requiring desmopressin treatment during delivery, thrombocytopenia (\<30000/mm3), Glanzmann disease, hypofibrinogenemia (\<1g/L) -aside from pregnancy) * High prenatal suspicion of placenta accreta spectrum disorder according to the obstetrician in charge * Placenta praevia diagnosed during delivery * Abruptio placentae * Significant bleeding (estimated blood loss\>500ml) within 12 hours before cesarean delivery * Eclampsia / HELLP syndrome * In utero fetal death * Administration of low-molecular-weight heparin or antiplatelet agents during the 7 days before delivery * Tranexamic acid contraindication * Sodium chloride contraindication * Women under legal protection * Poor understanding of the French language