The digital filtering process in the external recording of the His bundle activity

✍ Scribed by Shimon Abboud; Dror Sadeh

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 376 KB
• Volume: 15
• Category: Article
• ISSN: 0010-4809
• DOI: 10.1016/0010-4809(82)90024-6

✦ Synopsis

The usual methods of recording the His bundle activity have been based on triggered signal averaging and commonly used analog filters. These filters are of low-frequency cutoff ranging from 10 to 80 Hz and high-frequency cutoff up to 300 Hz. The use of digital filters is studied in the external recording of the His bundle potential which also employs a crosscorrelation function for the alignment of the waveforms. By using a low cutoff frequency of 30 Hz and a high-frequency cutoff of 250 Hz, the His bundle is found on the isoelectric line with amplitude between 4 to 7 pV. Fourier analysis of the His bundle waveform thus obtained shows that 90% of the power spectrum is below I50 Hz.

Methods

The surface electrocardiogram is obtained using a unipolar chestwall lead at the second intercostal space and the right sternal border. The electrocardiogram from that lead is recorded by a common ECG recorder (Eta-system, cardioline (8900121), bandpass of low-frequency cutoff at 0.3 Hz and high-418