MUNICH, Germany — A new international definition of heart attack could help clinicians identify cases in women that older diagnostic assumptions were more likely to overlook.
The European Society of Cardiology, American College of Cardiology, American Heart Association and World Heart Federation published the Fifth Universal Definition of Myocardial Infarction on 28 August.
The document standardises how clinicians use symptoms, electrocardiograms, cardiac imaging and troponin blood tests to determine whether heart-muscle injury resulted from a heart attack.
One important change is stronger support for sex-specific troponin thresholds. Troponin is released when heart muscle is damaged, but women can experience clinically important injury at levels below thresholds historically derived from predominantly male populations.
Using a single cutoff can therefore classify some women as having no heart attack even when their test has risen abnormally for a female patient.
The definition also gives greater recognition to heart-attack mechanisms that do not fit the familiar image of a cholesterol plaque blocking a large artery. Coronary-artery spasm, embolism and spontaneous coronary-artery dissection can restrict blood flow and are proportionally more common in women.
These cases are now more clearly treated as primary heart attacks when the evidence supports that conclusion. The document also distinguishes attacks caused by an imbalance between the heart’s oxygen supply and demand, as well as those associated with cardiac procedures.
Classification matters because it influences immediate treatment, follow-up, insurance records and whether a patient understands her future cardiovascular risk. A woman discharged without an accurate diagnosis may not receive prevention or specialist care.
Imaging can help when blood tests and symptoms do not reveal the mechanism. Yet access is unequal, and the guidance should not create a system in which accurate diagnosis depends on living near a highly specialised centre.
The new definition is not a home checklist. Chest pressure, breathlessness, nausea, unusual fatigue, pain in the upper body or sudden severe illness require urgent medical assessment. Symptoms differ between people, and waiting for a “typical” presentation can be dangerous.
Sex-specific thresholds must also be validated across laboratories, ages and populations. “Women” should not become a single biological category that obscures pregnancy, menopause, medication, kidney disease or other factors affecting interpretation.
The update represents progress because it places evidence about women inside the diagnostic standard rather than in a separate awareness campaign. Its impact will depend on whether emergency departments adopt the thresholds, clinicians receive training and women receive timely treatment when their results fall outside the old male-default model.
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