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Description
Returns the first time during a case if/when the patient is mechanically ventilated.
Limitation
- In cases involving extracorporeal oxygenation (e.g. cardiopulmonary bypass or ECMO), intermittent discontinuation of ventilation intraoperative is not captured; only first start time of ventilation, and last end time.
- Does not identify multiple instances of ventilator start and stop times during case (e.g. cardiopulmonary byass); only returns first ventilator start time, and last ventilator end time (if applicable).
- Does not work for small / pediatric patients receiving tidal volumes <100 mL
Data quality is limited to individual site documentation accuracy, completeness, and variable mapping, which is performed by each site, independently.
MPOG, as the coordinating center, reviews data quality at each data upload and monthly via Data Diagnostics and Case Validation tools. This review,
while thorough, may not contain all data elements relevant to this phenotype and thus should be carefully reviewed by the user.
Enumeration
| Value |
Value Code |
Definition |
Return Columns
Phenotype table not stored in database. No column returned.
Logic
Return the first time that the following 3 conditions are all met:
-
Peak Inspiratory Pressure (PIP): Group the PIP values (recorded once per minute) into a sliding 3 minute epoch and take the maximum value over the epoch. If the value is > 5 cm H2O, then the PIP condition has been met.
-
Measured Tidal Volume (TV): Group the Measured TV values (recorded once per minute) into a sliding 3 minute epoch and then take the maximum value over the epoch. If the value is > 100 mL then the TV condition has been met.
-
End Tidal CO2 (EtCO2): Group the EtCO2 values (recorded once per minute) into a sliding 3 minute epoch and then take the maximum value over the epoch. If the value is > 5 mmHg then the EtCO2requirement has been met
The time returned is the 1st minute of the 3-minute epoch.