SCAD

SCAD
Name	SCAD
Symptoms	Chest pain, radiating pain, shortness of breath, syncope
Complications	Myocardial infarction, arrhythmia, heart failure
Onset	Sudden
Duration	Acute
Causes	Arterial dissection, connective tissue disorders, hormonal factors
Risks	Pregnancy, fibromuscular dysplasia, systemic inflammation
Diagnosis	Coronary angiography, intravascular imaging, ECG, cardiac biomarkers
Treatment	Conservative medical therapy, revascularization when indicated

SCAD is a spontaneous, nontraumatic separation of layers within a coronary artery wall leading to intramural hematoma and luminal obstruction. It presents as an acute coronary syndrome and is distinct from atherosclerotic plaque rupture, requiring tailored diagnostic and therapeutic approaches. Recognition of associated conditions and appropriate imaging modalities is critical for optimal outcomes.

Medical condition

SCAD is classified as a nonatherosclerotic acute coronary syndrome affecting coronary arterial integrity and perfusion. It results from an intramural hemorrhage with or without an intimal tear, producing dynamic obstruction and ischemia. Clinical settings overlap with other cardiac emergencies encountered in centers such as Mayo Clinic, Cleveland Clinic, Johns Hopkins Hospital, and tertiary cardiology services in academic hospitals like Massachusetts General Hospital and Mount Sinai Hospital.

Causes and risk factors

Multiple predisposing factors have been identified, including connective tissue disorders such as Ehlers–Danlos syndrome and Marfan syndrome, vasculopathies like fibromuscular dysplasia, and hormonal states including peripartum and postpartum periods which draw attention from obstetric services at institutions like Brigham and Women's Hospital and UCSF Medical Center. Associates include systemic inflammatory conditions evaluated by specialists at centers like Mayo Clinic Arizona and triggers such as intense physical exertion or emotional stress documented in case series from Stanford Health Care and Cleveland Clinic Foundation.

Pathophysiology

The core mechanism is separation of coronary arterial wall layers producing an intramural hematoma that compresses the true lumen; this may originate from vasa vasorum rupture or an intimal tear. Microstructural vessel abnormalities reported in studies from University of Oxford, Harvard Medical School, Imperial College London, and University of Toronto suggest an arteriopathy that can be focal or diffuse. Pathological correlations have been described in reports linked to cardiovascular pathology units at Royal Brompton Hospital and The Johns Hopkins University School of Medicine.

Clinical presentation and diagnosis

Patients typically present with acute chest pain, dyspnea, syncope, or cardiac arrest; initial evaluation often mirrors protocols used in emergency departments at Guy's and St Thomas' NHS Foundation Trust and NewYork-Presbyterian Hospital. Electrocardiography, cardiac troponin assays, and coronary angiography are mainstays; intracoronary imaging with optical coherence tomography or intravascular ultrasound performed in catheterization laboratories at Mount Sinai Hospital and Cleveland Clinic improves diagnostic accuracy. Differential diagnosis includes plaque rupture cases managed at centers such as The Royal London Hospital and acute thrombotic occlusion seen in registries from Karolinska University Hospital and Singapore General Hospital.

Management and treatment

Initial management follows acute coronary syndrome pathways used at institutions like St. Thomas' Hospital, but conservative medical therapy is often preferred when feasible, with antiplatelet therapy, beta-blockers, and blood pressure control advocated by guideline committees and specialist centers including European Society of Cardiology affiliates and American College of Cardiology programs. Revascularization via percutaneous coronary intervention or coronary artery bypass grafting is reserved for ongoing ischemia or high-risk anatomy and performed in catheterization suites at Cleveland Clinic and surgical centers such as Mayo Clinic and UCLA Health. Pregnancy-associated cases require multidisciplinary coordination involving units like Royal Women's Hospital and maternal-fetal medicine teams at Mount Sinai Hospital.

Prognosis and complications

Short-term prognosis varies with extent of myocardial injury and hemodynamic stability; complications include myocardial infarction, life-threatening ventricular arrhythmias, and heart failure managed in cardiac intensive care units at Papworth Hospital and John Radcliffe Hospital. Recurrence risk and long-term outcomes are under active surveillance in longitudinal cohorts coordinated by research centers including University of British Columbia, Monash University, University of Sydney, and Duke University Medical Center.

Epidemiology and research developments

Epidemiological registries from centers such as Mayo Clinic, Stanford University, Imperial College London, and Rijksuniversiteit Groningen indicate that the condition disproportionately affects younger women and accounts for a meaningful fraction of myocardial infarctions in this demographic. Ongoing research networks and randomized trials involve collaborations among institutions like Harvard Medical School, University of Pennsylvania, Vanderbilt University Medical Center, and international registries coordinated through organizations such as European Society of Cardiology and specialty consortia at American Heart Association. Emerging studies focus on genetic predisposition, imaging biomarkers, and tailored therapeutics informed by investigators at Wellcome Trust-funded units and governmental research agencies including National Institutes of Health and Medical Research Council.

Category:Cardiology