Effect of ECG filter settings on J-waves.
Journal of Electrocardiology(2014)
Abstract
While J-waves were observed in healthy populations, variations in their reported incidence may be partly explicable by the ECG filter setting.We obtained resting 12-lead ECG recordings in 665 consecutive patients and enrolled 112 (56 men, 56 women, mean age 59.3±16.1years) who manifested J-waves on ECGs acquired with a 150-Hz low-pass filter. We then studied the J-waves on individual ECGs to look for morphological changes when 25-, 35-, 75-, 100-, and 150Hz filters were used.The notching observed with the 150-Hz filter changed to slurring (42%) or was eliminated (28%) with the 25-Hz filter. Similarly, the slurring seen with the 150-Hz filter was eliminated on 71% of ECGs recorded with the 25-Hz filter. The amplitude of J-waves was significantly lower with 25- and 35-Hz than 75-, 100-, and 150-Hz filters (p<0.0001).The ECG filter setting significantly affects the J-wave morphology.
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Key words
ECG filter,J-waves,Electrocardiogram
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