variable thresholding for peak detection in ecg signal

[qrspeaks,locs] = findpeaks(ecg signal,'MinPeakHeight',0.5,...

'MinPeakDistance',200);

I used the fixed threshold 0.5 for peak detection. But can anyone please help me to solve how to set variable threshold for finding peaks ?

Answer 1

[Star Strider]

I’m guessing that your signal has a wandering baseline, so MinPeakHeight is inconsistent with it. If that’s true, you can either use the highpass (or bandpass) functions and filter the signal to eliminate the wandering baseline, or experiment with MinPeakProminence to isolate the R-waves (that’s usually the objective).

[Hari raj]

yes sir. But i have used bandpass and eliminated the wandering baseline, when i apply findpeaks() with the fixed threshold i miss some of R peaks. So adaptive threshold need to be applied. So can you help me to solve how to apply adaptive threshold. I would be a great help!

[Star Strider]

The findpeaks function does not allow adaptive thresholding.

Use MinPeakProminence instead, as I already advised.

[Hari raj]

yes sir but even if i use minpeakprominence i could not get the exact R peaks without setting adaptive thresholding. Can you tell how to detect R peaks with adaptive thresholding for various arrhythmia condition?