Effect of electrocardiographic filters on the R-amplitude of canine electrocardiograms
Effect of electrocardiographic filters on the R-amplitude of canine electrocardiograms
Dvir, E.; Cilliers, P.J.; Lobetti, R.G.
Veterinary Record 150(6): 171-176
2002
ISSN/ISBN: 0042-4900
PMID: 11888110
DOI: 10.1136/vr.150.6.171
Lead II electrocardiograms (ECGs) were recorded in 88 dogs ranging in weight from 3-50 kg. A commercial direct-writing electrocardiograph was used to record the ECGs, first with manual HUM filter (notch filter at 50/60 Hz) and EMG filter (cut-off frequency of -3 dB at 35 Hz) on, immediately followed by a recording with both filters off. The mean (sd) reduction in R-amplitude with the filters on was 53(18)%, with a range from 22-100% and a median value of 51%.