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Description
This collation is used to return all readings of set tidal volume assocciated wtih a case
Limitation
This collation is not limited by any time bounds, rather will return all values associated with the case. Tidal volume (set) readings from before anesthesia start or after anesthesia end may be included.
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
- Given differences in OR monitor settings, it must be determined if tidal volumes on the case are recorded in liters or milliliters. If the highest volume on the case is less than two, tidal volumes are considered to be recorded using liters. Otherwise, assume milliliters.
- Find all set tidal volumes (concept ID 3192) on the case. Remove any tidal volumes marked as artifact as well as any with an invalid timestamp (e.g. before 1990 or recorded in the future).
- Align each tidal volume to the minute by truncating the seconds from the timestamp. If this would cause multiple tidal volumes to occur at the same minute, the average of those tidal volume recordings is used.
- If the case was recorded in liters, multiply each value by 1000 to standardize to milliliters
- Using the same approach in steps 2 and 3, find all recordings of PIP, PEEP Actual, and PEEP Set.
- Compare each tidal volume recording to the matching PIP and PEEP values for the same minute.
- Return only tidal volumes for which one of the following is true:
- A PIP value for that minute is unavailable
- PIP minus PEEP measured is greater than 6.0. If PEEP measured is not available, use PEEP Set.
- PIP is greater than 6.0 and no PEEP value is recorded