Cardiologists have approved the world’s first universal definition of a heart attack, a watershed moment that campaigners and clinicians say will rescue millions of women from a long history of being sidelined, under-diagnosed and under-treated.
The procedural overhaul, announced in Munich on Friday at the European Society of Cardiology’s annual congress, is the most significant reclassification of myocardial infarction in decades. It has been signed off jointly by the world’s four leading cardiovascular bodies — the ESC, the American College of Cardiology, the American Heart Association and the World Heart Federation.
The driving force behind the change is a damning recognition: for generations, women have received inferior care for heart attacks because the medical establishment has largely defined the condition around how it presents in men. Some of the less common forms of heart attack, which evidence shows overwhelmingly affect women, have been effectively coded as less serious, with treatment pathways to match.
“This is a landmark moment, a radical shift in how we define and diagnose heart attacks worldwide which will transform people’s care,” said Professor Bryan Williams, chief scientific and medical officer at the British Heart Foundation. “For decades, women have missed out on accurate diagnoses and treatment. This focus on finding less common causes of heart attacks, which predominantly affect women, should help to change that. It could be life-changing for huge numbers of women in the UK and worldwide.”
A Four-Part Rebuild of the Diagnostic Playbook
The new framework, published in the European Heart Journal, introduces clearer sex-specific diagnostic thresholds and reclassifies heart attacks into a more intuitive structure. Crucially, three types of attack that disproportionately affect women have been elevated in clinical importance.
Coronary artery spasm, where the artery tightens and starves the heart muscle of blood and oxygen, can be triggered by emotional stress, exercise or extreme cold. Coronary embolism, where a clot or fatty deposit travels to a coronary artery and blocks it. And spontaneous coronary artery dissection (Scad) — a tear in the coronary artery that occurs in women at least 80 per cent of the time, frequently during or shortly after pregnancy.
Each of these had previously been considered comparatively niche. Each is now front and centre of the new diagnostic hierarchy.
The reforms also formally retire the old numerical “type” system in favour of plain-English categories. The most serious cases, previously known as “type 1” and now termed “primary” heart attacks, will continue to flag the classic clot-blocked artery scenario. But the secondary causes — reduced blood flow from tears, spasms or emboli — have been pulled out of the shadows and given the weight they have long been denied.
Professor Nicholas Mills, a cardiologist at the University of Edinburgh who chaired the international taskforce, was in no doubt about the magnitude of the shift. He called it “the first time that we’ve had a truly global approach to aligning how we diagnose what is probably the most important diagnosis there is”.
“It kills so many people, and we’ve never got everyone together around the world to agree how we’re going to describe it, classify it, explain it to our patients,” Mills added. “Our job now is to implement this as widely as possible. It’s just as relevant for the UK as it is for any other country around the world. It is a revolution. It’s going to make care better for patients.”
The Troponin Blind Spot
At the heart of the new guidelines lies a single, deceptively simple blood test. Troponin, a protein released when the heart muscle is injured, has been the global gold standard for diagnosing heart attacks for years. The problem, clinicians now acknowledge, is that the threshold for a positive result was calibrated using data drawn predominantly from men.
Women, who naturally produce lower baseline levels of the protein, have often had to deteriorate further — or die — before crossing the line that triggers urgent intervention. The new guidelines lower the diagnostic threshold for women specifically, a change that cardiologists believe will catch thousands of cases currently slipping through the net.
Speaking to reporters in Munich, Mills did not flinch from the language he used. There had been, he said, “unintended systematic bias against women”, and the troponin discrepancy was a clear example. “This is used for all types of heart attack in every emergency department in the world, and we want to make sure that it’s used correctly,” he said.
Williams said the streamlined categories would also help patients themselves understand what had actually happened to them and what came next — no small matter in a field where survivors often leave hospital with more questions than answers.
A Long-Awaited Reckoning
For campaigners, clinicians and the families of women lost to cardiac events that should have been caught sooner, Friday’s announcement carries the weight of years of accumulated frustration. Heart disease remains the single biggest killer of women in the United Kingdom, yet women are demonstrably slower to be investigated, less likely to receive evidence-based therapies and more likely to die in the years following a heart attack than men.
The new guidelines do not erase that history. But they do, for the first time, place the global cardiology community on a footing where the differences in how women experience cardiac emergencies are no longer treated as edge cases to be acknowledged and then quietly set aside.
Implementation will now fall to hospitals, emergency departments and clinical training programmes in more than 100 countries. The British Heart Foundation has signalled that it will press for swift uptake across NHS trusts. Whether the revolution promised in Munich actually reaches the women who have waited decades for it will be the test that follows.
Why it Matters
For more than half a century, the architecture of heart attack care was built on a male template — from clinical trial data to diagnostic thresholds to the very vocabulary used to describe the event. The consequences have been measurable and grim: women die of heart attacks at higher rates, are misdiagnosed more often, and have waited generations for the medical establishment to formally acknowledge that their hearts can fail in ways the textbooks did not bother to name. Friday’s agreement does not undo that damage. But by redrawing the definition itself, by lowering the bar for diagnosis in women, and by elevating the causes that most commonly afflict them, the world’s leading cardiology bodies have, at last, placed women’s hearts where they should always have been — at the centre of the conversation.
