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Spontaneous coronary artery dissection (SCAD) occurs when there is an intimal tear that develops within the wall of an epicardial coronary artery, leading to intramural hematoma and false lumen formation with compromised coronary blood flow. This tear develops in the absence of atherosclerosis, trauma, or iatrogenic injury. SCAD is believed to account for 4% of acute coronary syndromes, and has been found to be the cause of ACS in 35% of women under the age of 50. Women comprise the majority of cases of SCAD( 87-95%).
Patients with Pregnancy-associated SCAD (P-SCAD) will often present with higher-risk features and more severe presentations compared with non-pregnancy related SCAD. They are more likely to present with STEMI (>>NSTEMI), impaired left ventricular function, left main and multivessel disease, and shock than other cohorts of SCAD patients.
The peak timing of P-SCAD is within the first month postpartum (with the highest incidence within the first week), although cases can occur throughout all trimesters of pregnancy or many months postpartum.
Keep SCAD in your differential for patients without typical risk factors who present with signs/symptoms of ACS. A strong index of suspicion is necessary to prevent bad outcomes and improve morbidity and mortality from this disease entity.
References
https://doi.org/10.1016/j.jacc.2020.05.084
https://doi.org/10.1161/CIRCULATIONAHA.122.059635