Artificial intelligence (AI) software tasked with evaluating heart signals (ECG data) measured by smartwatches may help identify a hidden and dangerous heart condition known as left ventricular systolic dysfunction (LVSD), although results varied between smartwatch brands and across ECG recordings, according to new, preliminary, independent late-breaking science presented today at the American Heart Association's Scientific Sessions 2026. The meeting takes place Nov. 6–9 in Chicago.