Can't help there. That stuff was worked out many years before I was involved. I'd ask John R or Paul S.
MDC_ECG_TIME_END_QRS 2::6400
MDC_ECG_TIME_PD_RR_GL 2::16000
Review synonyms stemming from terms that appear only in RTMMSv1
Review comments from ISO regarding 10101R
Review comments from ISO
2::17316 is a typo
Suggesteded the documentation for the MEM that Paul S sent out. Search for "nom refid".