Key result
A 100 Hz ECG bandwidth shows no difference in QRS slew rates versus 200 Hz.
Why the study?
The study aimed to characterize electrocardiographic signal slew rates in adults and infants to inform ECG instrument design requirements.
Observational (n=161)
ECG instruments should be designed to faithfully reproduce at least 400 μV/ms slew rates to capture extreme individual records, particularly in infants.
ECG slew rate specs may need revision for infant recordings; observational data leaves optimal bandwidth unresolved.
Frank lead electrocardiograms from 100 adults and 61 infants were recorded on magnetic tape and digitized at 2 ms intervals after bandwidth limiting fmst at 200 Hz and then at 100 Hz. Slew rates based on voltage differences between successive sampled values during QRS were computed for one cardiac cycle for each lead. Considered as a group, 200 μV/ms rates occur about 1% of the time in adult records, and 400 μV/ms rates occur about 1% of the time in infants' records. In extreme individual records, 300 μV/ms rates were exceeded 2% of the time in an adult record, and 400 μV/ms rates were exceeded 6.5% of the time in an infant's record. No significant differences in slew rates were observed to be caused by variation in bandwidth from 100 Hz to 200 Hz. It is recommended that ECG instruments be designed to be capable of faithfully reproducing at least 400 μV/ms slew rates.
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Berson et al. (1978) reported an observational. Bandwidth limiting at 100 Hz vs 200 Hz was evaluated on Slew rates during QRS. ECG slew rates of 200 μV/ms occurred about 1% of the time in adults and 400 μV/ms rates occurred about 1% of the time in infants, with no significant differences between 100 Hz and 200 Hz bandwidths.
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