Abstract 17453: Clinical Features of Peripartum Spontaneous Coronary Artery Dissection

Abstract

Background: Spontaneous coronary artery dissection (SCAD) is the principal cause of peripartum myocardial infarction (MI). Clinical features remain incompletely understood. Methods: Medical records of all women enrolled in a SCAD registry at the Mayo Clinic were reviewed to identify those who were either pregnant or ≤12 weeks postpartum at time of initial event. Diagnosis of SCAD was confirmed with coronary angiography in all cases. Obstetrical outcomes and incidence of recurrent SCAD events were assessed. Results: In total, 38 of 363 women enrolled in the registry met criteria for peripartum MI due to SCAD. Mean age at time of SCAD was 36±3 (range 27-42) years; 3 patients were pregnant at the time of initial event, and all pregnancies except 2 resulted in a live birth. Ten (26%) were diagnosed with multivessel SCAD (MV-SCAD). Most (60%) postpartum events occurred within 30 days of delivery. Antecedent co-morbidities included gestational hypertension/preeclampsia (9), fibromuscular dysplasia (7), gestational diabetes (4), and mixed connective tissue disease (1). Compared to US population birth data, women with peripartum SCAD were more likely to be ≤ 30 years at the time of first delivery (60% vs 42%) and more often multiparous (80% vs 59%). On long-term follow-up (median 3.7 years, IQR 1.1-7.1), 5 (13%) women experienced recurrent SCAD, with one episode occurring following a subsequent pregnancy. MV-SCAD was not associated with increased risk of recurrence (p=0.44). Conclusion: Women with peripartum SCAD are both older than the general obstetrical population at the time of first pregnancy and frequently multiparous at time of initial SCAD event. The highest frequency of SCAD was encountered during the first postpartum month, suggesting variations in hormonal and hemodynamic factors may contribute to SCAD events in susceptible women.