AaDO2: Difference between revisions
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{{discuss | who = Julie | question = I wonder if "null" is actually intended here, or if it was supposed to be 0. Ttenbergen 14:44, 2017 January 8 (CST) | {{discuss | who = Julie | question = I wonder if "null" is actually intended here, or if it was supposed to be 0. Ttenbergen 14:44, 2017 January 8 (CST) | ||
*AaDO2 is null if there is no data for FIO2, PaO2 and PaCO2. However, no data was set to zero value instead of null. In addition, AaDO2 and the corresponding score are required only when FIO2 >= 50%, otherwise should be treated as null. (Similarly with PO2 score, it is required when FIO2 < 50% and otherwise should be treated as null. When FIO2 =0, both AaDO2 and its score and PO2 score should be null.) Are we setting null to zero to facilitate the programming calculation? Is it possible to differentiate null from valid zero in both L_LOG and created_variables_CC - will the work be big? In L_LOG, these are the FIO2, CO2, PO2 and SerCO2. 14:49, 2017 March 16 (CDT)}} | *AaDO2 is null if there is no data for FIO2, PaO2 and PaCO2. However, no data was set to zero value instead of null. In addition, AaDO2 and the corresponding score are required only when FIO2 >= 50%, otherwise should be treated as null. (Similarly with PO2 score, it is required when FIO2 < 50% and otherwise should be treated as null. When FIO2 =0, both AaDO2 and its score and PO2 score should be null.) Are we setting null to zero to facilitate the programming calculation? Is it possible to differentiate null from valid zero in both L_LOG and created_variables_CC - will the work be big? In L_LOG, these are the FIO2, CO2, PO2 and SerCO2. 14:49, 2017 March 16 (CDT)}} | ||
== Data Integrity Checks == | |||
{{Data Integrity Check List}} | |||
[[Category: ABG]] | [[Category: ABG]] | ||
[[Category: APACHE II]] | [[Category: APACHE II]] |
Revision as of 21:50, 2018 October 26
Data Element (edit) | |
Field Name: | AaDO2 |
CCMDB Label: | <not in CCMDB> |
CCMDB tab: | <not in CCMDB>"" is not in the list (ADL, Apache, Dispo, Dxs, Como, CCI, ICD10, Temp, Pharm, Top Row, ...) of allowed values for the "FieldCCMDBTab" property. |
Table: | Created_variables_CC table |
Data type: | number |
Length: | ___ |
Program: | CC |
Created/Raw: | Created |
Start Date: | 1988-07-11 |
End Date: | 2300-01-01 |
Sort Index: | 34 |
The patient's Potassium level in mmol/L.
AaDO2 - Alveolar-arterial oxygen tension difference
Measures the difference in the partial pressure of oxygen between the alveoli and the arteries. This measures the efficiency of the oxygen exchange between the lung alveoli and the pulmonary capillaries.
- A calculated component of APACHE II score when FIO2 being administered to a patient is >=50%.
- To calculate the AaDO2:
Apache Physiological Variable | |
variable name | Alveolar-arterial oxygen tension difference |
unit | |
absolute max allowed | |
warning max | |
high score 4 | >500 |
high score 3 | >=350 and <500 |
high score 2 | >=200 and <350 |
high score 1 | |
score 0 | <200 |
low score 1 | |
low score 2 | |
low score 3 | |
low score 4 | |
AP phys warnMin | |
AP phys absMin |
APACHE Score
This value is used to generate the APACHE Score.
Collecting Apache physiological variables
There are some specific rules to follow in choosing which one of several lab results to collect.
See APACHE physiological variable collection for details.
Cross Chcks
Rules described in APACHE_physiological_variable_collection#Exceptionally_high_or_low_values are implemented by Check APACHE physiological variable high low.
Background
Why the constant 713?
The value 713 mmHg is the barometric pressure (Pb) used in the AaDO2 formula.
Normal Sea level Pb is 760 mmHg. (Winnipeg is close to sea level. We don't adjust for different elevations around the city nor do we adjust this value for the constant changes in Pb).
The barometric pressure is corrected for water vapor pressure (Pbc).
- (vapor pressure is 47 mmHg @ a temperature of 37C).
- (760-47)= Pbc of 713 mmHg.
can be less than 0
*4 AaDO2 can be 0 or negative
Unlike other physiological variables AaDO2 can be 0 or negative, so onlike the others the score for a 0 AaDO2 is 0 if AaDO2 < 200, which includes AaDO2<=0.
Note for programming only: The score is still null if the AaDO2 is null.
Data Integrity Checks
Data Integrity Checks (automatic list)
App | Status | |
---|---|---|
Check APACHE physiological variable high low | CCMDB.accdb | implemented |