The d_items table
Table source: CareVue and Metavision ICU databases.
Table purpose: Definition table for all items in the ICU databases.
Number of rows: 12,487
- CHARTEVENTS on
- DATETIMEEVENTS on
- INPUTEVENTS_CV on
- INPUTEVENTS_MV on
- MICROBIOLOGYEVENTS on
AB_ITEMID(for example, use
d_items.ITEMID = microbiologyevents.SPEC_ITEMID)
- OUTPUTEVENTS on
- PROCEDUREEVENTS_MV on
- D_ITEMS is sourced from two distinct ICU databases. The main consequence is that there are duplicate
ITEMIDfor each concept. For example, heart rate is captured both as an
ITEMIDof 211 (CareVue) and as an
ITEMIDof 220045 (Metavision). As a result, it is necessary to search for multiple
ITEMIDto capture a single concept across the entire database. This can be tedious, and it is an active project to coalesce these
ITEMID- one which welcomes any and all help provided by the community!
- Another source of duplicate
ITEMIDis due to the free text nature of data entry in CareVue - as a result there are additional
ITEMIDwhich correspond to misspellings or synonymous descriptions of a single concept. It is important to search for all possible abbreviations and descriptions of a concept to capture all associated
- If the
LINKSTOcolumn is null, then the data is currently unavailable, but planned for a future release.
|Name||Postgres data type|
The D_ITEMS table defines
ITEMID, which represents measurements in the database. Measurements of the same type (e.g. heart rate) will have the same
ITEMID (e.g. 211). The
ITEMID column is an alternate primary key to this table: it is unique to each row.
Note that the D_ITEMS table is sourced from two ICU databases: Metavision and CareVue. Each system had its own set of
ITEMID to identify concepts. As a result, there are multiple
ITEMID which correspond to the same concept. For CareVue data,
ITEMID = 211 is used to identify heart rates, whereas for Metavision data,
ITEMID = 220045 is used. All Metavision
ITEMIDs will have a value > 220000.
Note that the D_ITEMS table does not link to the LABEVENTS table, as this data was acquired separately from the hospital database. The D_ITEMS table was acquired from the ICU databases.
As an alternate primary key to the table,
ITEMID is unique to each row.
LABEL column describes the concept which is represented by the
ABBREVIATION column, only available in Metavision, lists a common abbreviation for the label.
DBSOURCE column was generated to clarify which database the given
ITEMID was sourced from: ‘carevue’ indicates the
ITEMID was sourced from CareVue, while ‘metavision’ indicated the
ITEMID was sourced from Metavision.
LINKSTO provides the table name which the data links to. For example, a value of ‘chartevents’ indicates that the
ITEMID of the given row is contained in CHARTEVENTS. A single
ITEMID is only used in one event table, that is, if an
ITEMID is contained in CHARTEVENTS it will not be contained in any other event table (e.g. IOEVENTS, CHARTEVENTS, etc).
CATEGORY provides some information of the type of data the
ITEMID corresponds to. Examples include ‘ABG’, which indicates the measurement is sourced from an arterial blood gas, ‘IV Medication’, which indicates that the medication is administered through an intravenous line, and so on.
UNITNAME specifies the unit of measurement used for the
ITEMID. This column is not always available, and this may be because the unit of measurement varies, a unit of measurement does not make sense for the given data type, or the unit of measurement is simply missing. Note that there is sometimes additional information on the unit of measurement in the associated event table, e.g. the
VALUEUOM column in CHARTEVENTS.
PARAM_TYPE describes the type of data which is recorded: a date, a number or a text field.