Characteristic parameters of electromagnetic signals from a human heart system

doi:10.1088/1674-1056/20/4/047401

Abstract The electromagnetic field of a human heart system is a bioelectromagnetic field. Electrocardiography (ECG) and magnetocardiography (MCG) are both carriers of electromagnetic information about the cardiac system, and they are nonstationary signals. In this study, ECG and MCG data from healthy subjects are acquired; the MCG data are captured using a high-T_c radio frequency superconducting quantum interference device (HTc rf SQUIDs) and the QRS complexes in these data are analysed by the evolutionary spectrum analysis method. The results show that the quality factor Q and the central frequency f_z of the QRS complex evolutionary spectrum are the characteristic parameters (CHPs) of ECG and MCG in the time-frequency domain. The confidence intervals of the mean values of the CHPs are estimated by the Student t distribution method in mathematical statistics. We believe that there are threshold ranges of the mean values of Q and f_z for healthy subjects. We have postulated the following criterion: if the mean values of CHPs are in the proper ranges, the cardiac system is in a normal condition and it possesses the capability of homeostasis. In contrast, if the mean values of the CHPs do not lie in the proper ranges, the homeostasis of the cardiac system is lacking and some cardiac disease may follow. The results and procedure of MCG CHPs in the study afford a technological route for the application of HTc rf SQUIDs in cardiology.

Keywords: bioelectromagnetic field magnetocardiography electrocardiography characteristic parameters threshold ranges

Received: 20 July 2010
Revised: 08 December 2010
Accepted manuscript online:

PACS:	74.90.+n	(Other topics in superconductivity)
	87.90.+y	(Other topics in biological and medical physics)
	83.85.Bc

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 607710003).

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Liu Xin-Yuan(刘新元), Pei Liu-Qing(裴留庆), Wang Yin(王寅), Zhang Su-Ming(张素明), Gao Hong-Lei(高红蕾), and Dai Yuan-Dong(戴远东) Characteristic parameters of electromagnetic signals from a human heart system 2011 Chin. Phys. B 20 047401

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