# Global updates to cardiovascular diagnostic definitions

> Live situation record from CLSTR: https://clstr.news/situations/global-updates-to-cardiovascular-diagnostic-definitions
> Updated: 2026-09-10T05:10:49.000Z. Sources: 8. Developments: 3.

Global cardiology and cardiovascular organizations have introduced updated universal definitions for heart failure and heart attacks to improve diagnostic accuracy and care consistency.

In late August 2026, a consensus published in the journal Circulation revised the definition of heart failure. This update emphasizes that a ‘normal’ ejection fraction may not guarantee cardiac health, as it can mask structural or functional abnormalities. The goal is to improve early prevention and treatment for the syndrome, which affects over 55 million people globally.

Following this, four major organizations—the European Society of Cardiology, the American College of Cardiology, the American Heart Association, and the World Heart Federation—introduced the ‘Fifth Universal Definition of Myocardial Infarction’ at the ESC Congress in Munich. This overhaul replaces the previous five-number classification system with three broader clinical categories focused on the underlying cause of the event.

The new guidelines specifically address historical disparities in care for women by prioritizing conditions such as coronary artery spasm, coronary embolism, and spontaneous coronary artery dissection (SCAD). These conditions occur at rates up to 10 times higher in women than in men and are often triggered by childbirth, exercise, or emotional stress rather than traditional clot-based blockages. To prevent diagnostic delays, the guidelines adjust the diagnostic threshold for troponin, a protein released during heart tissue damage, by implementing a lower threshold for women to ensure these specific types of attacks are not missed or deprioritized.

## Timeline

### 2026-09-10: Major cardiac societies adopt new universal heart attack definition

Four major cardiac societies have released a new universal definition for heart attacks, replacing numerical classifications with three clinical categories to improve diagnosis and address gender bias.

2 sources. https://clstr.news/cluster/major-cardiac-societies-adopt-new-universal-heart-attack-definition

### 2026-08-28: Cardiovascular organizations adopt new universal heart attack definition

Global health organizations have introduced a new universal heart attack definition to improve diagnostic accuracy and treatment for women, who often face delays due to non-clot-based attack types.

3 sources. https://clstr.news/cluster/cardiovascular-organizations-adopt-new-universal-heart-attack-definition

### 2026-08-24: Cardiology organizations update universal definition of heart failure

Global cardiology organizations have updated the universal definition of heart failure, warning that a normal ejection fraction does not always rule out the condition.

3 sources. https://clstr.news/cluster/cardiology-organizations-update-universal-definition-of-heart-failure

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Cite as: Global updates to cardiovascular diagnostic definitions. CLSTR, https://clstr.news/situations/global-updates-to-cardiovascular-diagnostic-definitions