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sql/durations/ventilation_classification.sql

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+-- THIS SCRIPT IS AUTOMATICALLY GENERATED. DO NOT EDIT IT DIRECTLY.
+DROP TABLE IF EXISTS ventilation_classification; CREATE TABLE ventilation_classification AS 
+-- Identify The presence of a mechanical ventilation using settings
+select
+  icustay_id, charttime
+  -- case statement determining whether it is an instance of mech vent
+  , max(
+    case
+      when itemid is null or value is null then 0 -- can't have null values
+      when itemid = 720 and value != 'Other/Remarks' THEN 1  -- VentTypeRecorded
+      when itemid = 223848 and value != 'Other' THEN 1
+      when itemid = 223849 then 1 -- ventilator mode
+      when itemid = 467 and value = 'Ventilator' THEN 1 -- O2 delivery device == ventilator
+      when itemid in
+        (
+        445, 448, 449, 450, 1340, 1486, 1600, 224687 -- minute volume
+        , 639, 654, 681, 682, 683, 684,224685,224684,224686 -- tidal volume
+        , 218,436,535,444,459,224697,224695,224696,224746,224747 -- High/Low/Peak/Mean/Neg insp force ("RespPressure")
+        , 221,1,1211,1655,2000,226873,224738,224419,224750,227187 -- Insp pressure
+        , 543 -- PlateauPressure
+        , 5865,5866,224707,224709,224705,224706 -- APRV pressure
+        , 60,437,505,506,686,220339,224700 -- PEEP
+        , 3459 -- high pressure relief
+        , 501,502,503,224702 -- PCV
+        , 223,667,668,669,670,671,672 -- TCPCV
+        , 224701 -- PSVlevel
+        )
+        THEN 1
+      else 0
+    end
+    ) as MechVent
+    , max(
+      case
+        -- initiation of oxygen therapy indicates the ventilation has ended
+        when itemid = 226732 and value in
+        (
+          'Nasal cannula', -- 153714 observations
+          'Face tent', -- 24601 observations
+          'Aerosol-cool', -- 24560 observations
+          'Trach mask ', -- 16435 observations
+          'High flow neb', -- 10785 observations
+          'Non-rebreather', -- 5182 observations
+          'Venti mask ', -- 1947 observations
+          'Medium conc mask ', -- 1888 observations
+          'T-piece', -- 1135 observations
+          'High flow nasal cannula', -- 925 observations
+          'Ultrasonic neb', -- 9 observations
+          'Vapomist' -- 3 observations
+        ) then 1
+        when itemid = 467 and value in
+        (
+          'Cannula', -- 278252 observations
+          'Nasal Cannula', -- 248299 observations
+          -- 'None', -- 95498 observations
+          'Face Tent', -- 35766 observations
+          'Aerosol-Cool', -- 33919 observations
+          'Trach Mask', -- 32655 observations
+          'Hi Flow Neb', -- 14070 observations
+          'Non-Rebreather', -- 10856 observations
+          'Venti Mask', -- 4279 observations
+          'Medium Conc Mask', -- 2114 observations
+          'Vapotherm', -- 1655 observations
+          'T-Piece', -- 779 observations
+          'Hood', -- 670 observations
+          'Hut', -- 150 observations
+          'TranstrachealCat', -- 78 observations
+          'Heated Neb', -- 37 observations
+          'Ultrasonic Neb' -- 2 observations
+        ) then 1
+      else 0
+      end
+    ) as OxygenTherapy
+    , max(
+      case when itemid is null or value is null then 0
+        -- extubated indicates ventilation event has ended
+        when itemid = 640 and value = 'Extubated' then 1
+        when itemid = 640 and value = 'Self Extubation' then 1
+      else 0
+      end
+      )
+      as Extubated
+    , max(
+      case when itemid is null or value is null then 0
+        when itemid = 640 and value = 'Self Extubation' then 1
+      else 0
+      end
+      )
+      as SelfExtubated
+from chartevents ce
+where ce.value is not null
+-- exclude rows marked as error
+and (ce.error != 1 or ce.error IS NULL)
+and itemid in
+(
+    -- the below are settings used to indicate ventilation
+      720, 223849 -- vent mode
+    , 223848 -- vent type
+    , 445, 448, 449, 450, 1340, 1486, 1600, 224687 -- minute volume
+    , 639, 654, 681, 682, 683, 684,224685,224684,224686 -- tidal volume
+    , 218,436,535,444,224697,224695,224696,224746,224747 -- High/Low/Peak/Mean ("RespPressure")
+    , 221,1,1211,1655,2000,226873,224738,224419,224750,227187 -- Insp pressure
+    , 543 -- PlateauPressure
+    , 5865,5866,224707,224709,224705,224706 -- APRV pressure
+    , 60,437,505,506,686,220339,224700 -- PEEP
+    , 3459 -- high pressure relief
+    , 501,502,503,224702 -- PCV
+    , 223,667,668,669,670,671,672 -- TCPCV
+    , 224701 -- PSVlevel
+
+    -- the below are settings used to indicate extubation
+    , 640 -- extubated
+
+    -- the below indicate oxygen/NIV, i.e. the end of a mechanical vent event
+    , 468 -- O2 Delivery Device#2
+    , 469 -- O2 Delivery Mode
+    , 470 -- O2 Flow (lpm)
+    , 471 -- O2 Flow (lpm) #2
+    , 227287 -- O2 Flow (additional cannula)
+    , 226732 -- O2 Delivery Device(s)
+    , 223834 -- O2 Flow
+
+    -- used in both oxygen + vent calculation
+    , 467 -- O2 Delivery Device
+)
+group by icustay_id, charttime
+UNION DISTINCT
+-- add in the extubation flags from procedureevents_mv
+-- note that we only need the start time for the extubation
+-- (extubation is always charted as ending 1 minute after it started)
+select
+  icustay_id, starttime as charttime
+  , 0 as MechVent
+  , 0 as OxygenTherapy
+  , 1 as Extubated
+  , case when itemid = 225468 then 1 else 0 end as SelfExtubated
+from procedureevents_mv
+where itemid in
+(
+  227194 -- "Extubation"
+, 225468 -- "Unplanned Extubation (patient-initiated)"
+, 225477 -- "Unplanned Extubation (non-patient initiated)"
+);