R peak detection of ecg and ppg

i have got both ppg and ecg signal... i am now struggling to detect the r peak and compare the r peak of ecg signal with ppg signal to calculate PTT... can anyone have idea about it....it will be more helpful for mr if you shared your ideas.thank you..

[Umar]

Hi Keerthi,

One common approach is to use the Pan-Tompkins algorithm for ECG R-peak detection. For PPG signals, you can apply peak detection algorithms like findpeaks or peakdet to identify peaks.

Here is a simple example in Matlab to detect R peaks in ECG signals using the Pan-Tompkins algorithm:

% Load ECG signal

ecg_signal = load('ecg_signal.mat');

% Apply Pan-Tompkins algorithm for R-peak detection

r_peaks = pan_tompkins(ecg_signal);

% Plot ECG signal with detected R peaks

plot(ecg_signal); hold on; plot(r_peaks, ecg_signal(r_peaks), 'ro', 'MarkerSize', 10); xlabel('Samples'); ylabel('Amplitude'); title('ECG Signal with Detected R Peaks'); legend('ECG Signal', 'R Peaks');

For PPG signal processing, you can adapt similar peak detection methods. Once you have the R peaks from both signals, you can compare their timings to calculate the Pulse Transit Time (PTT) as the time delay between the R peaks in ECG and PPG signals.

Hope this helps answer your question.

Answer 1

[Samatha Aleti]

Hi,

Refer the following MATLAB documentation page on “R Wave detection in the ECG”:

https://www.mathworks.com/help/wavelet/ug/r-wave-detection-in-the-ecg.html

You may also refer the MATLAB File Exchange function available:

https://www.mathworks.com/matlabcentral/fileexchange/61315-ecg-ppg-signal-for-ptt-hrv-and-prv