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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Circ Heart Fail. 2018 Jan;11(1):e004313. doi: 10.1161/CIRCHEARTFAILURE.117.004313

Figure 1. Seismocardiogram and Electrocardiogram Sensing Patch.

Figure 1

(a) The seismocardiogram (SCG) signal represents the vibrations of the chest wall in response to the movement of the heart and blood with each heartbeat. SCG is measured using a miniature, three-axis accelerometer, typically positioned on the mid-sternum. (b) The SCG signal consists of vibrations in three-axes: head-to-foot, dorso-ventral, and lateral. (c) A custom, small, wearable patch for measuring SCG and electrocardiogram signals was designed. The patch is placed on the chest using three gel adhesive electrodes, and stores data locally on a micro secure digital (microSD) card. The low power design allows for > 50 hours of continuous recording and use without recharging the battery.