PPG

TL;DR for operators A physiological monitor can reveal how a patient’s pulse behaves, but that does not mean it can reconstruct the patient’s medical history. Recognizing pulse regularity, identifying observations associated with medication administration, and inferring past diagnoses require different evidence. PPG-LM1 makes this distinction measurable. The model leads 10 of 11 reported zero-shot physiological recognition comparisons, yet achieves only 0.520–0.570 balanced accuracy on eight visit-level clinical-fact tasks. Its multi-level architecture improves physiological representation learning, but broader temporal context does not automatically make clinical history observable. ...