根据专利描述，苹果公司描述了一种集成于设备背面的电极系统，能够检测用户的手部动作和心跳，还配备了惯性测量单元（IMU），在 EMG 信号质量不佳时，辅助检测手部姿势和动作。

How often do you see an ECG that is just a little off? Maybe the T wave is flat, oddly-shaped or inverted. Maybe the ST segment is coved, very minimally-depressed or shows some J point elevation.

By examining changes from normal on the ECG, clinicians can identify a multitude of cardiac disease processes. There are two ways to learn ECG interpretation — pattern recognition (the most ...