Introduction: Who Should Undergo Diagnostics
Coronary artery dissection, also known as spontaneous coronary artery dissection or SCAD, is a medical emergency that requires immediate attention. Anyone experiencing sudden chest pain, pressure, or discomfort should seek emergency medical help right away, even if they believe they are not at risk of a heart problem. This condition does not announce itself in advance, and its symptoms mirror those of a typical heart attack, making quick action essential.[1]
Diagnostic testing becomes particularly important for people who present with symptoms suggesting a heart attack but who do not fit the usual profile of heart disease patients. SCAD most commonly affects women in their 40s and 50s, though it can occur at any age and can also affect men. Many of those diagnosed are younger, physically active, and have few or none of the traditional cardiovascular risk factors like high blood pressure, high cholesterol, or diabetes.[1][3]
Certain groups should be especially vigilant and seek immediate medical evaluation if heart attack symptoms develop. Women who have recently given birth or are in the postpartum period face higher risk, as SCAD accounts for a significant proportion of pregnancy-related heart attacks. The condition is also more likely around the time of menstruation or during postmenopause, suggesting that hormonal fluctuations may play a role.[3][4]
People with certain underlying conditions also warrant diagnostic attention when presenting with cardiac symptoms. Those with fibromuscular dysplasia (a condition affecting blood vessel walls), connective tissue diseases like Marfan syndrome, inflammatory diseases such as lupus or sarcoidosis, or dangerously high blood pressure are at increased risk for coronary artery dissection.[3][4]
Men with SCAD, though they account for less than 10 percent of cases, most often experience the artery tear after intense physical exertion such as strength training or lifting heavy objects. The physical strain may trigger the dissection.[3]
Diagnostic Methods
Diagnosing coronary artery dissection requires a high level of suspicion, especially when the patient does not have typical risk factors for heart disease. Medical teams usually begin their assessment in an emergency setting by asking about symptoms, personal and family medical history, and recent activities or stressors. Initial vital signs including blood pressure, pulse, and temperature are checked.[6][10]
Blood Tests
Blood testing plays an important role in identifying heart damage. When heart muscle is injured during a heart attack, certain proteins leak slowly into the bloodstream. These proteins, called cardiac troponins, can be measured through blood tests. Elevated troponin levels indicate that heart muscle has been damaged, though they do not by themselves reveal the cause of the damage. Other blood tests may be performed to evaluate overall health and rule out alternative explanations for symptoms.[4][10]
Electrocardiogram (ECG or EKG)
An electrocardiogram, commonly called an ECG or EKG, is a quick and painless test that measures the electrical activity of the heart. Small sticky patches called electrodes are placed on the chest, and the device records how electrical signals move through the heart with each beat. This test can show whether the heart is beating too fast or too slowly, and it can reveal patterns that suggest a heart attack is occurring or has occurred. Changes in the ST segment of the ECG tracing are particularly important markers of heart muscle damage.[4][10]
Echocardiogram
An echocardiogram uses sound waves to create moving pictures of the heart. This test allows doctors to see the heart’s chambers, valves, and pumping action in real time. When part of the heart muscle has been damaged by lack of blood flow, it may not move or contract normally. These areas of abnormal movement, called regional wall motion abnormalities, can be seen on an echocardiogram and suggest that a heart attack has occurred.[3][4]
Cardiac Catheterization and Coronary Angiogram
The definitive test for diagnosing coronary artery dissection is cardiac catheterization with coronary angiogram. This procedure involves inserting a thin, flexible tube called a catheter into a blood vessel, usually in the wrist or groin. The catheter is carefully guided through the blood vessels to reach the heart. Once in position, a special dye is injected through the catheter, and X-ray images are taken as the dye flows through the coronary arteries. These images show the inside of the arteries and can reveal blockages, narrowing, or tears.[4][10]
Because SCAD patients often have fragile arterial walls without the typical buildup of fatty deposits seen in atherosclerosis, the appearance on angiogram is distinctive. The non-affected segments of the coronary arteries usually appear smooth and free of disease. The dissected segment may show characteristic patterns that help doctors distinguish SCAD from heart attacks caused by plaque rupture.[9][12]
Intravascular Imaging
Sometimes the coronary angiogram alone does not provide a clear picture of what is happening inside the artery. In these cases, doctors may use additional imaging techniques performed from inside the blood vessel itself. These intravascular imaging methods can provide more detailed views of the artery wall and help confirm the diagnosis of SCAD. Special imaging catheters can be passed through the artery to visualize the layers of the vessel wall and identify tears or blood collections between the layers.[4][9]
Computed Tomography (CT) Scans
A coronary computed tomography angiography, or CCTA, uses X-rays and computer technology to create detailed three-dimensional images of the heart and blood vessels. This test can be useful for follow-up evaluations after the initial diagnosis to see how the dissected artery is healing. It is less invasive than cardiac catheterization and does not require threading a catheter through the blood vessels.[4]
Magnetic Resonance Imaging (MRI)
Cardiac magnetic resonance imaging or MRI uses powerful magnets and radio waves to create detailed images of the heart and blood vessels. Like CT scans, MRI can be used in follow-up care to monitor healing of the dissected artery without the need for invasive procedures.[4]
Screening for Associated Conditions
Because coronary artery dissection is associated with certain other blood vessel conditions, additional diagnostic testing may be recommended after the initial diagnosis. Screening for fibromuscular dysplasia in other arteries throughout the body is particularly important, as this condition affects the structure of blood vessel walls and increases the risk of dissection. Imaging of other arteries, such as those in the neck, kidneys, or brain, may be performed to check for abnormalities.[7][16]
Diagnostics for Clinical Trial Qualification
Clinical trials testing new treatments for coronary artery dissection use standardized diagnostic criteria to determine which patients can participate. These qualification tests ensure that enrolled patients truly have SCAD and meet specific study requirements.
Most clinical trials require confirmation of SCAD through cardiac catheterization and coronary angiogram. This imaging evidence serves as the gold standard for diagnosis and must clearly show the characteristic features of spontaneous coronary artery dissection rather than atherosclerotic plaque rupture or iatrogenic dissection caused by medical procedures.[4][9]
Blood tests measuring cardiac troponins are typically required to document that heart muscle damage occurred during the acute event. The pattern and timing of troponin elevation help confirm that a heart attack resulted from the dissection.[4]
ECG findings at the time of the acute event are often reviewed to classify the type of heart attack presentation. Some trials may focus specifically on patients who presented with ST-elevation myocardial infarction (STEMI), while others may include those with non-ST-elevation acute coronary syndrome. The ECG patterns help categorize the severity and type of cardiac event.[4]
Echocardiography results documenting the extent of heart muscle damage and the heart’s pumping function may be required. The ejection fraction, which measures what percentage of blood the heart pumps out with each beat, is commonly assessed. Some trials may only enroll patients with preserved heart function, while others may focus on those with more significant impairment.[3]
Additional imaging to identify associated conditions like fibromuscular dysplasia in other vascular beds may be part of trial screening protocols. This information helps researchers understand the broader arterial disease patterns in SCAD patients and may influence treatment approaches being tested.[7]
Follow-up angiography or advanced imaging at specified time points is often built into clinical trial protocols. These repeated imaging studies allow researchers to track whether the dissected artery heals over time and whether experimental treatments affect the healing process. They also help detect any new dissections that may occur.[13]
Mental health assessments may be included in some trial protocols, as anxiety, depression, and post-traumatic stress disorder are common after SCAD. Measuring psychological outcomes alongside physical healing provides a more complete picture of patient recovery.[18][20]
