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光学PPG推算血压依赖初始校准值，一旦血压波动较大或校准过期，读数偏差可达±15mmHg以上，不能作为调整降压药物剂量的依据

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Unverified手环血压监测绝大多数为PPG光学估算，需先用袖带式血压计校准且无法替代医疗设备，真正腕部气囊示波法测量（如华为部分型号）才有一定参考价值，高血压人群不应依赖手环读数调整用药75% similar Partially Verified血压监测为光电估算方式，非医疗级袖带测量，不能替代血压计用于诊断或调药依据74% similar

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