Effects of 50 Hz-filter circuit on cardiac action potential recording and analyzing / 中国应用生理学杂志
Chinese Journal of Applied Physiology
;
(6): 397-399, 2002.
Article
in Chinese
| WPRIM
| ID: wpr-339700
ABSTRACT
<p><b>AIM</b>To study the effects of the 50 Hz-filter circuit in a microelectrode amplifier on cardiac action potential waveform and parameters.</p><p><b>METHODS</b>Cardiac action potential signals were fed into a microcomputer through a glass microelectrode, a microelectrode amplifier, a differentiator and A/D converter. The cardiac action potential signals were recorded and analyzed with 50 Hz-filter circuit and without it, and the frequency spectrum in the signals was analyzed with the fast Fourier transformation.</p><p><b>RESULTS</b>When the 50 Hz-filter circuit was used, the phase 0 of the potential waveform was seriously distorted and prolonged. The maximal rate of depolarization at the phase 0 was cut down, while the other parameters were not effected.</p><p><b>CONCLUSION</b>There has already been much 50 Hz element in the action potential waveform. During amplifying the cardiac action potential signal, the 50 Hz-filter circuit should not be turned on. Otherwise, the experiment results will be effected.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Papillary Muscles
/
Physiology
/
Action Potentials
/
Cell Biology
/
Myocytes, Cardiac
/
Guinea Pigs
/
Amplifiers, Electronic
Limits:
Animals
Language:
Chinese
Journal:
Chinese Journal of Applied Physiology
Year:
2002
Type:
Article
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