Inclusion Criteria:  Pregnant women with mechanical prosthetic heart valves who are planned to deliver by caesarean delivery, provided that the gestational age at delivery is 28 weeks of gestation or more whether singleton or multi-fetal pregnancy.  Exclusion Criteria:  Patients with right-sided mechanical heart valves. Patients with a history of any thrombotic events e.g. Stuck prosthetic valve, or cerebrovascular stroke, etc. Patients with hypertensive disorders. Diabetic patients. Patients with known bleeding disorders or coagulation defects. Patients with known thrombophilia. Patients who refuse to share in the study.