Title :
A study on methods for impedance cardiography
Author :
Hu, Wenjun ; Sun, Hun H. ; Wang, Xiang
Author_Institution :
Sch. of Biomed. Eng., Drexel Univ., Philadelphia, PA, USA
Abstract :
Impedance Cardiography (ICG) has been developed to measure non-invasively cardiac functions, such as stroke volume (SV) and ventricular ejection time (VET) by the use of maximum change of the first derivative of impedance wave ΔZ(dZ/dt). A series of conventional signal processing methods were first described briefly, then, a new time-frequency analysis method was introduced in detail. Their advantages and disadvantages were studied and compared. The results showed that the latest method has more advantages in reducing ventilation artifacts and motion noise, resulting in greater accuracy. Moreover, the time-frequency analysis method can extract detail information on the transient impedance signal, which is more precise for the practical case. This method may also be powerful in revealing the insight of signal because of its ability to disclose the intimate relationship between time and frequency by the three dimensional display
Keywords :
bioelectric phenomena; biomedical measurement; cardiology; electric impedance measurement; medical signal processing; time-frequency analysis; volume measurement; cardiac functions; electrodiagnostics; impedance cardiography signal processing methods; impedance wave first derivative; motion noise; noninvasive measurements; three dimensional display; transient impedance signal; ventilation artifacts reduction; ventricular ejection time; Cardiography; Data mining; Impedance measurement; Noise reduction; Signal processing; Time frequency analysis; Time measurement; Transient analysis; Ventilation; Volume measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-4262-3
DOI :
10.1109/IEMBS.1997.758758
