Abstract Body (Do not enter title and authors here): Introduction:
Acute aortic dissection during pregnancy is rare but often life-threatening. Hormonal and hemodynamic changes, including increased blood volume and cardiac output, can weaken the aortic wall, increasing diameter and compliance. While changes may begin early, they peak in the third trimester. Patients with underlying aortopathy often remain undiagnosed until dissection occurs. Risk factors include hypertension, connective tissue disorders (e.g., Marfan, Loeys-Dietz), bicuspid aortic valve, family history, smoking, and pregnancy. Limited data contributes to gaps in screening and prevention. This case highlights a successful outcome in a third-trimester patient with acute Stanford Type A dissection.

Case:
29-year-old primigravid female at 36 weeks gestation with pregnancy complicated by limited prenatal care, class III obesity, and prediabetes presented for acute hematemesis, upper back pain, and severe headache. She was found to be tachycardic and hypertensive on arrival.

Contrast enhanced computed tomography angiography (CTA) revealed Stanford Type A aortic dissection. She was promptly taken for emergency Cesarean section with successful delivery, immediately followed by a Bentall procedure for ascending aortic dissection repair, including aortic root replacement using a 25mm St. Jude mechanical valve.

Post-operative complications included hemoperitoneum from splenic hematoma with capsule rupture requiring splenectomy. Gallbladder ischemia and perforation also necessitated cholecystectomy. She also developed worsening respiratory failure and was briefly supported with venovenous (VV) extracorporeal membrane oxygenation (ECMO).

Cardiovascular complications included persistent sinus tachycardia and severe left ventricular hypertrophy with preserved ejection fraction. Outpatient genetic testing was recommended.

Contraception was discussed and the patient was discharged in stable condition with recommended close follow up and genetic evaluation.

Conclusion:
This case highlights the need for high clinical suspicion when evaluating pregnant women with new cardiopulmonary symptoms, as timely recognition can be lifesaving. While aortic complications in pregnancy are associated with hypertension, underlying connective tissue disease or congenital aortic abnormalities, many occur without identifiable risk factors. Therefore, careful clinical evaluation is essential, as a missed diagnosis could be catastrophic to mother and baby.