Unscheduled Revascularization and Adverse Events in Spontaneous Coronary Artery Dissection

Overview

This retrospective cohort study of 86 SCAD patients identified clinical and angiographic predictors of unplanned revascularization and major adverse cardiac events (MACE). The findings highlight the importance of lesion characteristics and clinical presentation in guiding management and risk stratification.

Background

Spontaneous Coronary Artery Dissection (SCAD) is a rare, non-iatrogenic cause of acute coronary syndrome, predominantly affecting women, especially during the peripartum period. SCAD accounts for 1–4% of acute coronary syndrome cases and can lead to serious complications including arrhythmias and cardiogenic shock. While conservative management is preferred, some patients require revascularization, but data from high-volume centers remain limited. This study aims to improve understanding of predictors for unplanned revascularization and MACE in SCAD patients.

Data Highlights

A total of 86 patients with spontaneous coronary artery dissection were identified from 54,501 coronary angiographies performed between 2014 and 2019. Patients with prior cardiac surgery, PCI, or significant multivessel disease were excluded to focus on a homogeneous cohort. Clinical, angiographic, and laboratory data were collected, and patients were followed for mid- to long-term outcomes including MACE and unplanned revascularization. The primary endpoint was the occurrence of MACE and unplanned revascularization during follow-up.

Key Findings

• SCAD predominantly affected women and presented as acute coronary syndrome ranging from STEMI to unstable angina.
• Lesion morphology was categorized by length (spot vs. diffuse) and ostial involvement, with significant stenosis defined as ≥ 70% luminal narrowing.
• Unplanned revascularization occurred in patients initially managed conservatively, triggered by recurrent ischemia evidenced by symptoms, ECG changes, or non-invasive testing.
• MACE included acute myocardial infarction, revascularization, congestive heart failure, and cardiac death during follow-up.
• Exclusion of patients with moderate-to-severe multivessel disease or prior interventions allowed focus on spontaneous, non-iatrogenic dissections.

Clinical Implications

Clinicians should carefully evaluate lesion characteristics and clinical presentation in SCAD patients to identify those at higher risk for unplanned revascularization and adverse cardiac events. Conservative management remains the first-line approach, but close follow-up is essential to detect recurrent ischemia necessitating intervention. Risk stratification based on angiographic features can guide individualized treatment strategies.

Conclusion

This study underscores the heterogeneity of SCAD and the need for tailored management strategies. Identification of predictors for unplanned revascularization and MACE can improve patient outcomes through optimized risk stratification and timely intervention.

References

1. Pretty 1931 -- First description of spontaneous coronary artery dissection
2. Saw 2014 -- Angiographic classification of SCAD lesions