ROCHESTER, Minn. - Patients who suffer from a type of heart attack that affects mainly younger women, called spontaneous coronary artery dissection or SCAD, may benefit most from conservative treatment, letting the body heal on its own. This is according to a new scientific statement by a Mayo Clinic led team, published by the American Heart Association in its journal, Circulation.
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Most heart attacks occur when plaque builds up in arteries over a lifetime. The plaque ruptures, causing a blockage and a heart attack. In SCAD, a tear occurs inside an artery, and that can cause a blockage, leading to a heart attack.
"It may seem counterintuitive, but we discovered that treating SCAD the same way we treat heart attacks due to atherosclerosis can cause further tearing and damage to the vessel," says Sharonne Hayes, M.D., chair of the writing group for the new scientific statement and a Mayo Clinic cardiologist who founded its Women's Heart Clinic. "But the initial proper diagnosis is critical in guiding the care."
The statement is an overview of what an international group of experts know about SCAD, including:
Its high rate of post SCAD chest pain and recurrence
Its association with women, pregnancy, and physical and emotional stress triggers
Its connection to other diseases of the arteries, such as fibromuscular dysplasia
The best diagnosis and treatment recommendations based on new evidence and experts' care of SCAD patients
Until 2010, little was understood about SCAD, which had been described as a rare and universally fatal cause of acute coronary syndrome, heart attack and sudden cardiac arrest in women during and shortly after pregnancy.
Over the past several years research has refuted these misunderstandings. Increased understanding of SCAD, availability of intravascular imaging techniques, development of SCAD specific angiographic classification, increased awareness among providers, and efforts by SCAD patients using social media suggest that SCAD is much more common than previously thought, especially in young women.
The average age of women with SCAD ranges from 45 to 53 years. SCAD occurs overwhelmingly in women, and among individuals who have few conventional cardiovascular risk factors, such as high blood pressure, unhealthy cholesterol levels or smoking, the statement says.
"Even with what we have learned over the past several years, SCAD continues to be misdiagnosed and underdiagnosed," Dr. Hayes says. "And we know it is not rare. It is the No. 1 cause of heart attack during pregnancy and in the period right after giving birth, and the No. 1 cause of heart attack in women under age 50."
Misdiagnoses often happen because of a low suspicion of heart attack in younger women who do not have typical heart disease risk factors but arrive at an emergency room with classical heart attack symptoms, such as discomfort in the chest and the upper body, shortness of breath, nausea and light-headedness, Dr. Hayes says. Misdiagnoses also can happen if the patient is sent to the catheterization lab, where stents are often used to open blocked arteries. The statement provides expert consensus to help health care providers know how to best treat SCAD patients.
The statement shows that, in most patients who did not receive stents, the dissections healed on their own within weeks and months. For some, the healing began within days, Dr. Hayes says.
The statement also emphasizes the importance of tailored cardiac rehabilitation programs for SCAD patients. In addition, addressing mental health is critical, the authors say. "Anxiety and depression are common in SCAD survivors, and they often are being treated by health care providers who have little familiarity of the disease or in providing psychosocial support," Dr. Hayes says. "We've found that online support groups can be immensely helpful in addition to finding a care team that is responsive to patients' concerns," she says.
The cause of SCAD is believed to be a combination of factors, including diseases of the arteries, genetic factors, hormonal influences and, less commonly, connective tissue diseases. These factors can be compounded by environmental stressors.
The statement points to persistent gaps in knowledge of SCAD. Only recently have there been limited prospective studies, and most available data are retrospective and observational. Larger-scale prospective and epidemiological studies are needed to understand the disease and improve treatment, Dr. Hayes says.