Pixel Watch 3 introduces a Loss of Pulse Detection feature that automatically alerts emergency services when it detects a loss of pulse, potentially saving lives. This addresses the critical issue of unwitnessed out-of-hospital cardiac arrest (OHCA), where individuals experience pulseless arrhythmias without bystanders to initiate an emergency response. OHCA results in millions of deaths globally, with up to three-quarters of cases occurring in unwitnessed settings. Many victims are found too late for resuscitation attempts, highlighting the urgency of minimizing time from collapse to treatment as part of the "Chain of Survival" standard of care, which includes interventions like CPR. The development and testing of this feature aim to tackle this significant public health challenge by leveraging wearable technology to provide timely detection and response in life-threatening situations.

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