Title :
A new apparatus and method for measuring the myocardial electrical impedance spectrum
Author :
Dzwonczyk, R. ; Hartzler, A.W. ; Liu, A.Y.
Author_Institution :
Dept. of Anesthesiol., Ohio State Univ. Hospitals, Columbus, OH, USA
Abstract :
Myocardial electrical impedance (MI) is correlated to the vitality of the tissue. The authors describe a new apparatus and method for measuring MI in a clinically applicable way. The apparatus is embedded-controller-based and connects to the heart via two cardiac pacing leads. Impedance spectra are obtained from fast Fourier transform analysis of a current impressed on the myocardium and the resultant voltage drop. New spectra are determined automatically in real-time succession. The impedance measurement is unaffected by electrode polarization. This apparatus has its greatest potential use in determining the need for and type of resuscitation following coronary artery graft surgery intraoperatively and monitoring the viability of cardiac transplant surgery postoperatively
Keywords :
bioelectric phenomena; biomedical equipment; biomedical measurement; cardiology; electric impedance measurement; muscle; cardiac pacing leads; cardiac transplant surgery; coronary artery graft surgery; electrode polarization; fast Fourier transform analysis; medical technique; myocardial electrical impedance spectrum; tissue vitality; transplant viability monitoring; Arteries; Electric variables measurement; Electrodes; Fast Fourier transforms; Heart; Impedance measurement; Myocardium; Polarization; Surgery; Voltage;
Conference_Titel :
Computers in Cardiology 1992, Proceedings of
Conference_Location :
Durham, NC
Print_ISBN :
0-8186-3552-5
DOI :
10.1109/CIC.1992.269541
