ECMO in MIMIC

[aegis301]

Dear Mimic-Community,

i'm interested in working with MIMIC on a project concerning patients that received ECMO therapy during their stay. I want to first identify patients what were hooked up to an ECMO during their stay. I wrot the following query to check for item ids concerned with ECMO therapy:

SELECT
      stay_id,
      MIN(charttime) AS ecmo_start,
      MAX(charttime) AS ecmo_end
    FROM
      mimiciv_icu.chartevents
    WHERE
      itemid = 229268 -- circuit configuration
      AND value = 'VA' -- filter for VA ECMO
    GROUP BY
      stay_id

I want to explicitely filter for patients that received veno-arterial ECMO therapy. By doing this I get back 73 patients that received this kind of therapy. Seems to be a very low number. Does anyone have experience with this patient collective in MIMIC and has an explanation for this? Or am I missing something?

Kind regards