This systematic review evaluated non-invasive wearable systems designed to detect out-of-hospital cardiac arrest, with detection sensitivity as the primary outcome. Thirteen publications were included, with participant numbers ranging from 18 to 1,423; wristbands were the most common device type. Sensitivity ranged from 43.8% to 100%, with ten studies reporting sensitivity of at least 90%, while false positives ranged from multiple daily alerts to one per twenty-one user-years. External validation and real-life data were scarce, leaving uncertainty about the balance between detection sensitivity and false alarms.
Wearable cardiac-arrest detection is a promising recognition technology, but variable false-alarm performance and limited real-life validation constrain confidence in its clinical usefulness.
Study limitation: External validation and real-life data were scarce, limiting applicability of reported detection performance to routine use.
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