May-Thurner Syndrome

In this episode of the Pregnancy Pearls Podcast, host Dr. Pliny breaks down May-Thurner syndrome (iliac vein compression syndrome)—a condition that is frequently overlooked when evaluating leg swelling and blood clot risks in expectant mothers. Learn why anatomic compression of the left common iliac vein by the right common iliac artery creates a 'garden hose' pressure effect, why pregnancy unmasks these symptoms, and how to differentiate normal pregnancy swelling from a serious vascular concern. Key Topics Covered: Anatomy & Pathophysiology: What Mae Thurner syndrome is and how compression leads to sluggish blood flow, chronic venous hypertension, and deep vein thrombosis (DVT). Pregnancy Risk Factors: How hypercoagulability, increased clotting factors, vein dilation, and uterine pressure exacerbate clot risks. Prevalence & Symptoms: Why up to 1 in 5 adults have compression without knowing it, and key red flags such as persistent left-sided leg swelling, heaviness, pelvic discomfort, or recurrent DVTs. Diagnosis: Limitations of leg compression ultrasounds for high pelvic veins, and when to consider pelvic Doppler, MRI/MR venography, or postpartum CT venography. Treatment & Management: Safe anticoagulation in pregnancy (therapeutic vs. prophylactic Low Molecular Weight Heparin / Lovenox), avoiding contraindicated oral anticoagulants/warfarin, compression therapy, and postpartum stenting options. Listener Case & Clinical Pearl: Addressing persistent unilateral swelling and empowering patients and providers to advocate for further workup. Connect & Contact: Email: [email protected] Instagram: @pregnancy_pearls Facebook: @pregnancypearls