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Late Potential Parameter and Noise Level Variability Caused by Bandpass Versus High‐Pass Filtering and Type of Signal Averaging Equipment Used
Author(s) -
VACEK JAMES L.,
SMITH SCOTT,
DUNN MARVIN I.
Publication year - 1989
Publication title -
journal of electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 0892-1059
DOI - 10.1111/j.1540-8167.1989.tb01563.x
Subject(s) - band pass filter , qrs complex , high pass filter , signal (programming language) , amplitude , time domain , noise (video) , filter (signal processing) , low pass filter , mathematics , electrocardiography , signal averaged electrocardiogram , control theory (sociology) , medicine , computer science , cardiology , electronic engineering , physics , engineering , artificial intelligence , image (mathematics) , computer vision , programming language , control (management) , quantum mechanics
Late potentials detected by signal averaged electrocardiography are predictive of ventricular arrhythmia induction and sudden cardiac death. Prior studies have used a variety of equipment and filtering parameters. The correlation between data from two commercially available signal averaging units and the effects of bandpass as opposed to high‐pass filtering were studied in 18 hospitalized patients. The addition of a low‐pass filter at 250 Hz to high‐pass filtering at 40 Hz caused no significant change in any time domain variable (total duration of the filtered QRS, root mean square voltage of the last 40 msec of the filtered QRS, and duration of low‐amplitude potentials < 40 μV). However, the data was significantly different (P < 0.01) when studies from the two machines were compared. We conclude that bandpass filtering does not affect time domain late potential variables in a clinically relevant fashion compared to high‐pass filtering alone. Significant data differences exist between the two different pieces of equipment. Therefore, caution should be exercised in extrapolating data obtained from each of the different machines.