Questions about Ectopy

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

Description

For the Ectopy Type 1 and Type 2, the majority of the input to value is 'None'. Can you clarify whether this is because no irregularity was detected or did they simply not record the type of irregularity?

SELECT A.itemid, label, total_obs, recorded_none 
FROM  
(SELECT itemid, COUNT(*) AS total_obs FROM CHARTEVENTS 
WHERE ITEMID in (161, 162, 224650, 226479)
GROUP BY ITEMID) A
INNER JOIN
(SELECT itemid, COUNT(*) as recorded_none FROM CHARTEVENTS 
WHERE ITEMID in (161, 162, 224650, 226479) AND value='None'  
GROUP BY ITEMID) B
ON A.itemid = B.itemid
INNER JOIN
d_items d ON A.itemid = d.itemid

Over 80% of the entries for Type 1 was recorded as 'None', which seems very high. Is this something that is regularly checked but rarely detected?

Secondly, what is the difference between Ectopy Type 1 and Type 2? I had a look at the distinct values recorded in these categories along with their frequency using

SELECT DISTINCT value, itemid, COUNT(value)
FROM CHARTEVENTS WHERE ITEMID IN (161, 162, 224650, 226479)
GROUP BY itemid, value
ORDER BY itemid, value

It appears that aside from 'None', the most popular entries are "PVC's" (premature ventricular contraction) and "PAC's" (premature atrial contraction) for both Type 1 and Type 2 Ectopy. I'd be grateful if you can shed some light on what the distinction between the Ectopy Types are.

Start with the Ectopy item IDs and the supplied CHARTEVENTS queries, then consult the linked MIMIC online documentation. Done means clarifying what “None” represents and documenting the distinction between Ectopy Type 1 and Type 2.