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Normal limits of the high-fidelity pediatric ECG. Preliminary observations
P W Macfarlane1, E N Coleman, E O Pomphrey
1University Department of Medical Cardiology, Royal Infirmary, Glasgow, Scotland.
Insights
This study revises pediatric electrocardiogram (ECG) normal limits, finding higher amplitude limits and wider QRS durations than previously reported. Accurate pediatric ECGs require a 500 samples/sec digital sampling rate.
Area of Science:
- Pediatric Cardiology
- Biomedical Engineering
- Clinical Electrophysiology
Background:
- Established pediatric electrocardiogram (ECG) normal limits may not reflect current diagnostic standards.
- Previous studies may have utilized lower fidelity recording methods, potentially skewing results.
Purpose of the Study:
- To revise the normal amplitude and duration limits for pediatric electrocardiograms (ECG).
- To establish optimal digital sampling rates for high-fidelity pediatric ECG acquisition.
Main Methods:
- Utilized a digital electrocardiograph with a 500 samples/sec sampling rate on over 1,780 neonates, infants, and children.
- Employed a 12-lead ECG configuration, substituting V4R for V3, with simultaneous off-line digital recording.
- Analyzed ECG data using established computational techniques to determine new normal limits.
Main Results:
- Identified upper 98th percentile normal amplitude limits up to 46% higher than previously published values.
- Observed wider QRS durations compared to existing pediatric ECG data.
- Demonstrated significant sex-related differences in amplitude and duration, particularly in adolescents.
Conclusions:
- Current pediatric ECG normal limits require revision based on high-fidelity digital recordings.
- A digital sampling rate of 500 samples/sec is crucial for accurate pediatric ECG amplitude and duration measurements.
- Sex-specific reference ranges may be necessary for adolescent ECG interpretation.
Abstract:
A study of more than 1,780 neonates, infants, and children was carried out, using a digital electrocardiograph with a sampling rate of 500 per second, to revise the normal limits of the pediatric ECG. The 12-lead ECG was used with V4R replacing V3. All leads were recorded simultaneously off-line in digital form on magnetic tape and were subsequently analyzed using well-established computing techniques. The results showed that the upper 98 percentile limit of normal amplitudes could be up to 46% higher than previously published limits. Differences in some mean values were very much higher, though these are of less clinical significance. In addition, QRS durations were found to be wider than previously published data. Sex-related differences could be demonstrated in both amplitude and duration measurements, particularly in the early adolescent years. This study confirms that to record pediatric ECGs with high fidelity, it is necessary to use equipment that converts the ECG from analog to digital form at a rate of 500 samples/sec. Significant errors in amplitude and duration measurements may be expected if a much lower sampling rate is utilized.