Questions regarding MIMIC-III Waveform

[Jwoo5]

Prerequisites

• [x] Put an X between the brackets on this line if you have done all of the following:
  • Checked the online documentation: https://mimic.mit.edu/
  • Checked that your issue isn't already addressed: https://github.com/MIT-LCP/mimic-code/issues?utf8=%E2%9C%93&q=

Description

Hello, I am working with ECG data from MIMIC-III Waveform Database Matched Subset and ECG notes from NOTEEVENTS. What I currently want to do is to map ECG data with their corresponding ECG notes, but I've encountered some problems while doing so.

1. I already know that there is no charttime with ECG notes, but I am wondering if there are any routines for when the ECG notes were charted (e.g., practitioners usually chart the ECG notes every 9:00 am, ...).
2. I think it is not feasible to chart ECG notes from the entire ECG data since the ECG records are too long (several hours / days). Are there any metadata that pinpoints or at least roughly shows when the ECG notes are charted from the corresponding ECG data? In other words, any indication that shows which part of the ECG data the practitioner looked at in order to chart ECG notes.
3. Lastly, I found that there are multiple ECG notes which are charted at the same date (actually, same subject_id, hadm_id, chartdate). Is there any way to identify which one is the first, second, ..., and so on?

Thank you in advance! Jungwoo Oh