Oral Morphine Equivalent (Normalized)

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Description

This phenotype uses the results of the "oral morphine equivalent" phenotype and normalizes (divides by) to patient weight (kg) and anesthesia duration (hours).

As with the parent phenotype, this normalized phenotype also returns whether an opioid medication was documented as given but was not included in the OME for the case due to lack of dosing information (labeled as "unknown"). For example, if 10mg IV morphine was recorded and an unknown dose of IV fentanyl, the case would return the OME for the morphine and "unknown" as a 1, indicating another opioid medication was given and not included in the OME calculation. Additionally, this phenotype returns whether Remifentanyl was included as the current OME converion used is 0. As this phenotype is dependent on patient weight and case duration, it returns a column for these values indicating if either is missing.

Limitation

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.

Value Type

Not Set

Enumeration

Value	Value Code	Definition

Return Columns

Name	Data Type

Granularity

Logic

This collation returns the following columns:

- a single value for normalized OME per case, this value is the OME derived from the "Oral Morphine Equivalent" phenotype divided by the case duration (hours) and patient weight (kg). If case duration is less than one hour, one hour is used for calculations

- unknown dose - yes (1) / no (0) - an indicator for opioids that were unable to calculate OME value as data was missing to calculate dose given

- REMI - yes (1) / no (0) - an indicator whether remifentanil was used in the case

- WeightMissing - yes (1) / no (0) - an indicator whether patient weight was missing for the case (if missing we are unable to normalize the OME)

- DurationMissing - yes (1) / no (0) - an indicator whether case duration was missing for the case (if missing we are unable to normalize the OME)