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HRV data

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saramang +0 points · about 1 month ago

Hi, I'm working on mesa data. I'm analyzing the first patient, I took the ecg signal from mesa-sleep-0001.edf , and then I looked for the R peaks in mesa-sleep-0001-rpoint.csv . The problem is that the peaks don't match with the scored signal. Can someone explain me why?

thanks

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mrueschman +0 points · about 1 month ago

I will make a note in the documentation regarding this, but it's possible that only the sleep period was thoroughly reviewed for alignment between the beat detector and the EKG signal. One of our technicians reviewed a couple MESA studies and found that beats very early in the recording (e.g. the first 15 seconds) did not match as consistently as beats further on into the recording. In looking at mesa-0001 it seemed like the very first beat in the R-point file was mismatched, though the following beats looked OK. We were comparing the "seconds" column in the R-point file to our visualization of the raw EKG signal (measuring the time from recording start to the apparent R peak).

Let me know if you come across issues as you dig in further.