HRV FFT Spectrum

[Ayman162]

Hello, Iam trying to perform HRV FFT Spetrcum analysis on filtered ECG Signal, i am facing 1 major problem which is acquiring the RR intervals from the filtered rectified ECG Signal, i have tried to look this up a lot on the internet and tried a lot of things that did not yield to promissing results. Can somebody suggest the most efficient way to extract RR intervals from filtered rectified ECG wave?

[robo_Jeff]

Hi Ayman162,

What software are you using?  Would it be possible to use arrays to analyze the data? If so, you can use logic combinations to look at the y-values in the array. If we are expecting the peak of the QRS complex to be about 1 mV, we can start using comparison logic when the values exceed .8 mV for example. Then when the y-value (n) is LESS than y-value (n-1), we can store the timestamp associated with the (n-1) value. The next time we get a timestamp from the peak of the QRS complex, we just subtract the first timestamp from it to get the RR interval.

I didn't get a chance to look through this page, but at first glance it seems like it might be helpful, so I thought I'd include it:

http://www.physionet.org/tutorials/hrv/