Google is preparing to release an AI-powered loss-of-pulse detection feature on the Pixel Watch 3 in the United States. This technology is designed to identify out-of-hospital cardiac arrests especially when people are alone and unable to call for help. The system analyzes pulse patterns and movement, then uses green and infrared light sensors to confirm whether a pulse has truly stopped. If the watch still detects no movement or heartbeat, it triggers a loud haptic buzz for 35 seconds. If the wearer remains unresponsive, the watch automatically calls 911 within about a minute. The algorithm was trained using data from three groups: patients with implanted defibrillators, volunteers experiencing temporary loss of pulse through a tourniquet test, and nearly 1,000 real-life users. When tested, the feature correctly identified 67% of pulse loss events while producing almost no false emergency calls. Google prioritized specificity (avoiding unnecessary 911 calls) over full sensitivity because an overly sensitive model could cause real-world problems. Experts believe the feature will improve as more users opt in and contribute data. Although not intended for people with severe cardiac conditions, the tool aims to provide early detection and improve survival rates for everyday users.
*Read more *-https://spectrum.ieee.org/heart-attack-smartwatch