Gynaecology & Obstetrics A pregnant woman in 3rd trimester has normal blood pressure when standing and sitting. When supine, BP drops to 90/50. What is the diagnosis? A Compression of uterine artery B Compression of aorta C Compression of IVC (inferior vena cava) D Compression of internal iliac vessels 💡 Explanation A pregnant woman in 3rd trimester has normal blood pressure when standing and sitting. When supine, BP drops to 90/50. What is the diagnosis? ✓ Correct Answer: C. Compression of IVC (inferior vena cava)