Analogies evolve by increasing transmission fidelity in the communication of complex information.

Cardiac arrest (CA), one of the leading causes of death worldwide (, ), poses a severe challenge to emergency medical systems due to its abrupt onset and poor prognosis. In Europe, the survival rate for out-of-hospital cardiac arrest (OHCA) is 8%, whereas in China—a populous country—the survival rate for OHCA patients is merely 1% (, ), which is significantly lower than the global average (). As a core emergency intervention, high-quality cardiopulmonary resuscitation (CPR) serves as a critical link in improving patient survival rates, whether performed by laypersons in out-of-hospital settings or emergency physicians in clinical environments (, ). The core components of high-quality CPR include minimizing pauses in chest compressions, ensuring adequate compression rate and depth, avoiding chest leaning, and preventing excessive ventilation (). Therefore, cultivating personnel with standardized CPR operational capabilities is of great practical significance for optimizing the emergency chain of survival and improving patient prognosis (). As future healthcare professionals, medical students are required to complete basic life support courses during their academic training. However, relevant studies have shown that even trained professionals often struggle to deliver high-quality chest compressions, which they frequently perform below the recommended standards (). To improve the quality of CPR operation training, various medical institutions have explored a variety of solutions, among which CPR devices equipped with audio-visual feedback functions have become the focus of attention in the industry, as they can provide real-time assistance in standardizing operations and help learners promptly correct operational deviations (, ). Although current guidelines have highlighted the potential of feedback devices in CPR education (), previous studies indicate that existing devices possess certain limitations. In response, we report a novel wearable CPR feedback device (the wearable CPR real-time audio-visual feedback device, CPR-BT, ZL 2023 23470890.6) (). This device not only provides real-time audiovisual feedback during performance but also comprehensively evaluates the trainee’s overall chest compression quality post-training. Leveraging this capability, trainees can enhance their performance through “deliberate practice”—a resuscitation educational strategy endorsed by the American Heart Association (AHA) guidelines (). This approach integrates repetitive training with assessment-based personalized feedback, enabling the development of targeted training protocols tailored to individual operators’ weaknesses ().