TY - JOUR
T1 - Combined Seismo-and Gyro-Cardiography
T2 - A More Comprehensive Evaluation of Heart-Induced Chest Vibrations
AU - Yang, Chenxi
AU - Tavassolian, Negar
N1 - Publisher Copyright:
© 2013 IEEE.
PY - 2018/9
Y1 - 2018/9
N2 - This paper reports on the combined analysis of seismocardiogram (SCG) and gyrocardiogram (GCG) recordings. An inertial measurement unit (IMU) consisting of a three-Axis micro-electromechanical (MEMS) accelerometer and a three-Axis MEMS gyroscope is used to record heart-induced mechanical vibrations from the chest wall of the subjects. An electrocardiogram and an impedance cardiogram (ICG) sensor are also used as references for segmenting the cardiac cycles and recording the aortic valve opening and closure (AO and AC) events, respectively. A simplified model is proposed to explain the mechanical coupling of the chest wall to the IMU. Correlations and time differences are analyzed for the annotation of GCG and its first derivative with respect to ICG and SCG as references. Experimental results indicate a precise identification of systolic points such as the AO and AC events. The left ventricular ejection time and pre-ejection period metrics calculated from gyroscope recordings are also shown to accurately track their corresponding trends acquired from ICG signals. Waveform similarity analyses indicate that the first derivative of GCG has a better similarity with SCG than the GCG signal itself. Experimental results also suggest that interdevice differences in GCG recordings would need to be addressed before this technology can gain widespread application.
AB - This paper reports on the combined analysis of seismocardiogram (SCG) and gyrocardiogram (GCG) recordings. An inertial measurement unit (IMU) consisting of a three-Axis micro-electromechanical (MEMS) accelerometer and a three-Axis MEMS gyroscope is used to record heart-induced mechanical vibrations from the chest wall of the subjects. An electrocardiogram and an impedance cardiogram (ICG) sensor are also used as references for segmenting the cardiac cycles and recording the aortic valve opening and closure (AO and AC) events, respectively. A simplified model is proposed to explain the mechanical coupling of the chest wall to the IMU. Correlations and time differences are analyzed for the annotation of GCG and its first derivative with respect to ICG and SCG as references. Experimental results indicate a precise identification of systolic points such as the AO and AC events. The left ventricular ejection time and pre-ejection period metrics calculated from gyroscope recordings are also shown to accurately track their corresponding trends acquired from ICG signals. Waveform similarity analyses indicate that the first derivative of GCG has a better similarity with SCG than the GCG signal itself. Experimental results also suggest that interdevice differences in GCG recordings would need to be addressed before this technology can gain widespread application.
KW - MEMS accelerometer
KW - MEMS gyroscope
KW - gyrocardiography (GCG)
KW - seismocardiography (SCG)
KW - signal processing
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U2 - 10.1109/JBHI.2017.2764798
DO - 10.1109/JBHI.2017.2764798
M3 - Article
C2 - 29990006
AN - SCOPUS:85032666343
SN - 2168-2194
VL - 22
SP - 1466
EP - 1475
JO - IEEE Journal of Biomedical and Health Informatics
JF - IEEE Journal of Biomedical and Health Informatics
IS - 5
M1 - 8076909
ER -