❤️ The Definition of a Heart Attack Just Changed—and Women Stand to Gain

For decades, in the eyes of many hospitals, whether or not you were having a heart attack was decided partly by a number calibrated on men. Last month, the world's leading cardiology groups made it clear that has to stop.

Four major cardiology societies—the European Society of Cardiology, the American College of Cardiology, the American Heart Association, and the World Heart Federation—have jointly rewritten how a heart attack is defined. What changed? They ditched the old, confusing "type 1," "type 2," "type 4c" designations in favor of three plain-language categories: primary (something went wrong, like a blockage or tear, in the artery itself), secondary (another acute problem, like a blood pressure crash or a runaway heart rate, starved the heart of oxygen), and procedure-related (a complication within 30 days of a stent, bypass, or other heart procedure).

That may sound like medicalese, but it’s meaningful for us. Three of the changes land squarely on midlife and older women.

Troponin thresholds are now non-negotiably sex-specific. Troponin is the protein that leaks into your blood when heart muscle is injured, and it's the key blood test doctors use to diagnose a heart attack. Women naturally run lower troponin than men—for one widely used assay, the healthy female cutoff is roughly half the male one. Yet hospitals have long judged both sexes against a single unisex number, which set the bar too high for women. The new definition requires sex-specific cutoffs precisely to prevent, in the task force's words, "systematic bias and the under-recognition of myocardial injury in female patients." Translation: heart attacks that used to be missed in women should be less likely to be missed, if hospitals follow the guidance.

SCAD gets promoted. Spontaneous coronary artery dissection—a tear in a coronary artery wall—overwhelmingly affects women, often younger than the classic cardiac patient, and it has been chronically underdiagnosed. It sat in an ambiguous corner of the old system. Now it's explicitly a primary heart attack, alongside plaque rupture.

MINOCA is now a “working diagnosis.” MINOCA used to stand for myocardial infarction with non-obstructive coronary arteries, meaning you had a heart attack caused by poor blood flow to the heart, despite no evidence of major blockage in the arteries. It's now myocardial injury — a deliberate downgrade, because most of these patients turn out not to have had a heart attack at all. It disproportionately affects women, and it is no longer a “conclusive diagnosis,” but rather a designation to keep digging. People with MINOCA often turn out to have myocarditis (inflammation of the heart muscle), Takotsubo syndrome (“broken heart syndrome,” where the heart muscle weakens from sudden physical or emotional stress), or another cause entirely. Guidelines call for a cardiac MRI ideally within two weeks, because the signs of myocarditis and Takotsubo can fade after that — and when MRI is done, an actual heart attack is actually the answer in only about a quarter of cases.

What doesn't change: What you do. Remember you are not immune, even if you’re an age group Ironman champion. Being fit does not mean you can’t have heart disease…or a heart attack. Do not blow off symptoms. 

Classic symptoms include:

• Chest pain: Also described as tightness, crushing (like someone is sitting on your chest), pressure, squeezing, aching.

• Radiating pain or discomfort: Be alert to any pain or discomfort in your upper body, especially if it is radiating through your shoulders or jaw, neck, and arms. Some people also experience back pain.

• Sweating: Breaking out in a cold sweat (as opposed to a hot flash), where you start perspiring for seemingly no reason, is another classic heart attack alarm.

Other, less-recognized symptoms include:

1. Shortness of breath: If you find yourself unusually breathless doing everyday tasks like taking the stairs or carrying groceries, don’t blow it off. That’s a serious warning sign.

2. Weakness: Unexplained weakness can be a symptom of blockages that lead to heart attack. If you suddenly feel inexplicably weak or shaky, don’t ignore it.

3. Nausea or vomiting: Pain or pressure in your stomach and/or nausea and vomiting is another overlooked symptom of heart attack. 

4. Dizziness or lightheadedness: Unexplained dizziness is another sign, again because of lack of blood flow.

5. Unexplained fatigue: Feeling overwhelmingly fatigued from daily activity like making the bed is a big red flag.

If you experience one or more symptoms of a heart attack, call 911. That’s a medical emergency. Every minute matters when it comes to getting life-saving care.