A groundbreaking health feature designed to detect the loss of pulse in cardiac arrest victims has been developed for Google’s Pixel Watch 3, with FDA clearance received in late February 2025. The technology, spearheaded by Google research scientist and University of Washington associate professor Jake Sunshine, will be available to U.S. users by the end of March.
The innovative “Loss of Pulse Detection” capability utilizes optical heart-rate sensors embedded in the watch’s rear surface to identify when a user’s heart stops beating. Upon detection, the system automatically initiates emergency services contact, potentially saving crucial minutes in life-threatening situations.
Sunshine, who previously founded Sound Life Sciences, a University of Washington healthcare technology startup acquired by Google in 2022, brings significant medical expertise to the project. As a trained anesthesiologist with extensive experience in operating rooms and intensive care units, he recognized the potential for consumer smart devices to surpass traditional medical monitoring equipment in sophistication and capability.
The timing of emergency response is critical in cardiac arrest cases, with survival rates dropping approximately 10% for each minute without resuscitation. This new technology aims to address the particular danger of unwitnessed cardiac events, where immediate medical intervention is often delayed.
The feature’s development required careful consideration of
reliability and accuracy, particularly given its integration with emergency services. To minimize false alarms, the system implements a comprehensive assessment process lasting one minute, followed by a 20-second countdown before emergency services are contacted. When activated, the watch transmits an automated message to 911 operators, including both the medical emergency details and the user’s location.
Building on Google’s existing Pixel Watch safety features, which include Car Crash Detection, Fall Detection, and various heart monitoring capabilities, the Loss of Pulse Detection feature has already been implemented in 14 countries throughout the European Union before its upcoming U.S. launch.
Sunshine emphasizes the feature’s potential impact on public health, noting that cardiac arrest represents one of the most time-sensitive medical emergencies. The technology leverages the increasingly sophisticated capabilities of consumer wearables to address critical healthcare challenges at scale.
The opt-in feature represents a significant advancement in wearable health technology, transforming smartwatches from lifestyle
accessories into potentially life-saving devices. By bridging the gap between consumer technology and emergency medical response, the system could dramatically improve outcomes for cardiac arrest victims, particularly those who experience events while alone.
The development comes at a time when wearable technology is
increasingly being recognized for its potential in healthcare monitoring and emergency response. The incorporation of sophisticated medical detection capabilities into everyday devices represents a growing trend toward more accessible and immediate health monitoring solutions.
This advancement also highlights the growing collaboration between academic institutions and technology companies in developing practical healthcare solutions. The project combines Sunshine’s medical expertise and academic background with Google’s technological capabilities, resulting in a feature that could have significant real-world impact.
As smartwatches continue to evolve beyond their initial functionality as fitness trackers and communication devices, innovations like the Loss of Pulse Detection feature demonstrate their potential to serve as crucial health monitoring tools. The technology’s rollout in the United States marks an important step forward in leveraging consumer devices for potentially life-saving medical applications.