Serial Ecg Frequency6/13/2023 ![]() The power envelopes consist of narrow and compact shapes in all leads in healthy young volunteers. Artifact-free QRS complexes from approximately 500 beats were averaged with the R-wave maximum from lead V2 as a trigger. Wide-band power envelope analysis up to 1000 Hz was applied on each QRS complex region. Both groups of subjects have the same width of the regular QRS complex with no ST-segment abnormalities. To demonstrate its diagnostic contribution we present the results of 14 subjects - 7 healthy volunteers and 7 ischemic patients during short 15-minute resting supine recordings. The aim of the present study is to introduce ultra-high-frequency and high-dynamic-range 12-lead ECG measurements using an electromagnetically shielded environment (Faraday cage) and a battery-powered ECG monitor with sampling of 25 kHz and 24-bit resolution.
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