ECG P QRS T onset and peak detection method

Details ECG P QRS T onset and peak detection method ECG P QRS T onset and peak detection method

1997-04-30

1998-06-02

Jastrzab, Jeffrey R.

Surgery

Truss

Pad

A61B 50452

Patent

active

057586543

ABSTRACT:
A method and apparatus for detecting P or T waves in an electrocardiogram signal in intervals before and after each (previously) detected QRS wave. Within each interval, a candidate pair of samples are selected. If the candidate pair are separated by a time duration which does not exceed a predefined time duration then that pair is rejected and the process repeats. Otherwise, the area "A" of a closed polygon bounded by all of the samples between and including the candidate pair is derived (the polygon's base line extends linearly a distance "d" between the candidate pair of sample intervals). The maximum vertical displacement "h" between the base line and any portion of the polygon above the base line is derived. If "h" does not exceed a predefined minimum vertical displacement, then the candidate pair is rejected and the process repeats. Otherwise, a value Gamma=A*h/d is derived for the candidate pair. If Gamma does not exceed any value of Gamma derived previously in respect of any previously selected candidate pair, then the candidate pair is rejected and the process repeats. Otherwise, a value BestGamma is set equal to the candidate pair's value Gamma. Another candidate pair is then selected and the process repeats. The P or T wave is selected as that whose value Gamma equals the value BestGamma.

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