SCAD in Men: The Heart Attack That Breaks the Rules

When a 38-year-old woman presents to the emergency department with chest pain and is found to have had a myocardial infarction, one of the first diagnoses on the differential is spontaneous coronary artery dissection, or SCAD. When a 52-year-old man presents with the same picture, SCAD rarely appears on the initial differential. That gap in clinical suspicion is why SCAD in men is so frequently missed, delayed in diagnosis, and mismanaged.

What SCAD Is, and Why It Causes a Heart Attack

Spontaneous coronary artery dissection is a tear in the inner wall of a coronary artery that occurs without trauma or atherosclerotic plaque rupture. The tear creates a false lumen, a second channel within the arterial wall, that fills with blood from the true lumen. As blood accumulates in this false lumen, it compresses the true lumen from the outside, reducing or eliminating blood flow to the heart muscle downstream.

The result is myocardial infarction. The mechanism, however, is entirely different from the classic model of atherosclerosis and plaque rupture that most men associate with heart attacks. There is no clogged artery in the conventional sense. There is no buildup of cholesterol plaque that ruptured. The coronary artery looked normal until the moment the dissection occurred.

This distinction has major clinical consequences. Standard risk factor management for atherosclerotic cardiovascular disease, such as statin therapy and aggressive LDL lowering, has a different relationship to SCAD prevention than it does to conventional MI prevention. The pathophysiology is different, the patient profile is different, and the treatment approach is different.

Why SCAD Predominantly Affects Women

Roughly 90% of SCAD cases occur in women. This is not a small skew. It is an overwhelming demographic imbalance that shapes how the condition is recognized and researched.

Several biological factors contribute. Hormonal influences appear to play a meaningful role, as the highest concentration of SCAD cases in women occurs in the peripartum period, particularly in the first few weeks after delivery. Female sex hormones may affect the structural integrity of the arterial wall through effects on collagen and fibromuscular architecture.

Fibromuscular dysplasia (FMD), a non-inflammatory, non-atherosclerotic arterial disease that affects the medial layer of arterial walls and creates a characteristic beading appearance on imaging, is found in a high proportion of women with SCAD. FMD is itself much more common in women than men. In cohort studies, FMD prevalence among SCAD patients has been reported at 50 to 80%, creating a strong biological link between arterial wall fragility and susceptibility to dissection.

Emotional or psychological stress is frequently cited as a precipitating factor in women with SCAD, and catecholamine surges from acute psychological stress may create hemodynamic conditions that stress the arterial wall. Connective tissue disorders such as Marfan syndrome, Ehlers-Danlos syndrome, and others are also associated with SCAD in both sexes but may be more thoroughly evaluated in women where SCAD diagnosis is more anticipated.

The Male SCAD Profile: How Men Are Different

Understanding the 10% of SCAD that occurs in men requires recognizing that the male presentation often diverges from the female presentation in several meaningful ways.

Age at presentation. Men with SCAD tend to be older than women with SCAD. Where female SCAD patients often present in their 30s and 40s, male SCAD patients more commonly present in their 50s and 60s. This older presentation means the clinical picture overlaps more with conventional atherosclerotic MI, making SCAD harder to recognize.

Traditional cardiovascular risk factors. Men with SCAD more commonly carry traditional cardiovascular risk factors, including hypertension, hyperlipidemia, and prior smoking history, than women with SCAD. This overlap with the conventional MI profile further obscures the SCAD diagnosis. A cardiologist evaluating a 58-year-old man with hypertension, elevated LDL, and acute chest pain may reasonably begin with an atherosclerotic MI framework, especially if initial imaging does not suggest dissection.

Physical exertion as a trigger. While peripartum stress and emotional stress are the most common precipitating factors in women with SCAD, physical exertion plays a larger relative role in men with SCAD. Valsalva-heavy activities, extreme cardiovascular exertion, and competitive athletics are cited in a substantial proportion of male SCAD cases. The hemodynamic demands of extreme exertion, including sudden pressure changes, increased heart rate, and elevated systolic blood pressure, may create conditions that precipitate coronary arterial tears in susceptible individuals.

FMD and connective tissue associations. While FMD is less prevalent in men than women with SCAD, it is still found in a meaningful proportion of male SCAD patients and should not be dismissed as a female-only consideration. Men with SCAD may warrant FMD screening as part of their post-SCAD evaluation.

Why SCAD Is Missed in Men

Several structural and cognitive factors combine to make SCAD a missed diagnosis in men.

Base rate thinking. Because SCAD is so much more common in women, emergency physicians and cardiologists may not immediately add it to the differential when evaluating a man with acute MI. Pattern recognition cuts both ways: it enables fast, accurate diagnosis for typical presentations and creates blind spots for atypical ones.

Overlap with atherosclerotic MI. When a man with hypertension and elevated cholesterol presents with an anterior MI, the default assumption is plaque rupture and atherothrombotic occlusion. This assumption guides initial management. If the coronary angiogram reveals a vessel that appears narrowed or occluded without a classic atherosclerotic lesion, the dissection may still be missed without advanced intracoronary imaging.

Angiographic subtlety. SCAD does not always look obvious on standard coronary angiography. The intramural hematoma may appear as a smooth, diffuse narrowing rather than a focal stenosis, and without index of suspicion, it can be read as a long atherosclerotic lesion or coronary spasm. Definitive diagnosis often requires intracoronary imaging: optical coherence tomography (OCT) or intravascular ultrasound (IVUS), which provide cross-sectional views of the vessel wall and can directly visualize the false lumen and intramural hematoma.

Anchoring on prior MI history. A man with a prior history of atherosclerotic MI who presents with another MI is unlikely to trigger SCAD consideration on the second event, even if the second event is mechanistically different. Clinical anchoring on the prior diagnosis can obscure subsequent atypical events.

How SCAD Is Diagnosed

The diagnostic pathway for SCAD in men follows the same general framework as in women, with the caveat that clinical suspicion must first be activated.

Initial Presentation and Biomarkers

SCAD presents as acute MI. Chest pain is the typical presenting symptom, often accompanied by diaphoresis, shortness of breath, and sometimes jaw or arm pain. Troponin elevation confirms myocardial injury. ECG changes may include ST elevation (STEMI pattern) or depression and T-wave changes (NSTEMI pattern) depending on the severity and location of the dissection.

These initial presentations are clinically indistinguishable from atherosclerotic MI, which is precisely why the subsequent diagnostic steps matter.

Coronary Angiography

Coronary angiography, performed via cardiac catheterization, is the primary diagnostic tool. In SCAD, the angiographic findings may include a visible intimal flap (a linear radiolucency representing the tear), smooth diffuse narrowing of a segment without focal plaque appearance, spontaneous contrast retention in the false lumen, or in some cases a normal-appearing vessel if the dissection heals rapidly.

Angiographic classification systems for SCAD (Types 1 through 3, depending on the imaging pattern) exist and help guide the diagnostic process. However, misclassification is possible without high-quality imaging and an experienced interventional cardiologist.

Optical Coherence Tomography and Intravascular Ultrasound

OCT and IVUS are the definitive diagnostic tools for SCAD. OCT uses near-infrared light to create very high-resolution cross-sectional images of the vessel wall and can directly visualize the intimal tear, the false lumen, and the intramural hematoma. IVUS uses ultrasound waves to provide similar cross-sectional information with somewhat lower resolution but greater tissue penetration.

Both modalities require passage of a specialized catheter into the coronary artery during the catheterization procedure. They add time and technical complexity to the procedure, and they carry a small procedural risk. Not all catheterization laboratories routinely perform intracoronary imaging for every MI, which contributes to SCAD underdiagnosis. If there is clinical suspicion for SCAD, ask whether intracoronary imaging was performed or should be performed.

Coronary CT Angiography

In some settings, coronary computed tomography angiography (CCTA) may be used, particularly in hemodynamically stable patients where invasive angiography can be deferred or in follow-up imaging to assess healing of a dissection segment. CCTA does not provide the intraluminal detail of OCT or IVUS but can identify some dissection patterns.

Why Conservative Management Is Often Preferred

In conventional atherosclerotic MI, the default strategy for a flow-limiting lesion is percutaneous coronary intervention: stenting to restore luminal diameter and blood flow. In SCAD, the same approach is frequently counterproductive and sometimes harmful.

The arterial wall in SCAD is already structurally compromised. Passing a wire into the true lumen carries the risk of entering the false lumen or propagating the dissection. Balloon angioplasty may extend the intramural hematoma. Stenting a dissected segment that would spontaneously heal adds hardware to a vessel that is already recovering, creates long-term stent complications, and does not address the underlying arterial wall pathology.

For this reason, conservative management, meaning medical therapy without coronary intervention, is often preferred in SCAD when the patient is hemodynamically stable, the vessel is not completely occluded, and adequate collateral blood flow is present. In this approach, the artery is given the opportunity to heal spontaneously. The data show that the majority of SCAD dissections do heal on follow-up imaging.

Coronary intervention in SCAD is reserved for specific circumstances: hemodynamic instability, ongoing ischemia in a large territory that does not stabilize, or left main dissection. When intervention is necessary, it carries higher complication rates in SCAD than in atherosclerotic MI, and the technical approach is modified accordingly.

Recovery and Recurrence Risk

Recovery from SCAD requires a different framework than recovery from atherosclerotic MI.

Myocardial recovery. The heart muscle injured during the ischemic event typically follows the same recovery trajectory as in other types of MI: damaged muscle may recover partially if blood flow is restored rapidly, and scar formation occurs over weeks to months. Left ventricular function assessment with echocardiography is standard at baseline and during follow-up.

Coronary healing. The dissected segment typically heals over a period of weeks to months. Follow-up coronary imaging, whether angiographic or by CT, may be performed to confirm healing. Your cardiologist will determine the appropriate follow-up schedule.

Recurrence risk. SCAD recurrence is a real and meaningful concern. Published estimates of recurrence vary considerably across studies, in part because of different follow-up durations and study populations, but rates in the range of 10 to 30% at 5 to 10 years have been reported in registries. Male sex is associated with somewhat lower recurrence risk than female sex, in part because the hormonal and peripartum triggers that recur in women are not present. However, recurrence is not eliminated, and ongoing monitoring and risk factor management are important.

FMD and connective tissue evaluation. Given the association between SCAD and FMD, many centers now perform FMD screening after SCAD, typically with imaging of the renal and iliac arteries. This is worthwhile in men as well as women, though the yield is lower in men. Genetic evaluation for connective tissue disorders may also be discussed depending on clinical features.

Psychological impact. Surviving a heart attack at an age where you did not expect one, particularly with a mechanism that does not fit conventional MI, is psychologically complex. Anxiety, depression, and post-traumatic symptoms are documented in SCAD survivors. These deserve attention as part of comprehensive care.

Frequently Asked Questions

Q: Can SCAD happen to men who have never had any symptoms or known heart disease? A: Yes. SCAD can occur in men with no prior cardiovascular symptoms or known coronary disease. This is one of its most clinically challenging features: it does not follow the gradual symptom progression of atherosclerotic disease and can present as a sudden event in a man who has had normal cardiac workups previously. The absence of known coronary disease does not exclude SCAD.

Q: How do I know if my MI was from SCAD and not from a blocked artery? A: The definitive distinction requires coronary angiography and, ideally, intracoronary imaging with OCT or IVUS. If you had an MI and are uncertain whether SCAD was specifically evaluated, ask your cardiologist to review the angiographic findings and clarify the diagnosis. In some cases, SCAD is not recognized during the initial event and is identified retrospectively when symptoms recur or when a second look is taken at the imaging.

Q: My cardiologist says I do not need a stent after my SCAD. Is that standard? A: Conservative management without stenting is often the preferred approach in SCAD when the patient is stable and the vessel is not completely occluded. This is different from the typical approach to atherosclerotic MI, where stenting is routine. Conservative management in SCAD allows the dissection to heal spontaneously. Whether it is appropriate for your specific case depends on clinical factors your cardiologist will evaluate. If you have questions about why stenting is not being recommended, ask for a clear explanation of the reasoning.

Q: Is SCAD hereditary? A: SCAD has a multifactorial etiology that is not simply Mendelian hereditary. However, connective tissue disorders and FMD, which are associated with SCAD, can have genetic components. A small number of familial SCAD clusters have been reported. If you have a first-degree relative who had SCAD, or if you have features suggesting a connective tissue disorder, discuss genetic evaluation with your cardiologist.

Q: What lifestyle changes are relevant for SCAD survivors? A: Because SCAD is not primarily an atherosclerotic disease, the standard post-MI lifestyle advice focused on LDL lowering and plaque stabilization is not the complete picture for SCAD. Physical activity guidance specifically for SCAD survivors tends to emphasize caution around high-intensity exertion, heavy lifting, and activities involving the Valsalva maneuver, particularly in the months after the event. Your cardiologist will provide specific guidance on return to activity based on your healing status and overall cardiovascular assessment.

The Signal Check is fifteen questions mapping the male cardiovascular risk pattern, including the physiological domains most commonly missed in standard screenings. It produces a specific starting point for your next clinical conversation.