Person—partial pressure of carbon dioxide, millimetres of mercury NNN
Data Element Attributes
Identifying and definitional attributes | |
Metadata item type:![]() | Data Element |
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Short name:![]() | Partial pressure of carbon dioxide |
METEOR identifier:![]() | 320642 |
Registration status:![]() | Health!, Recorded 14/07/2006 |
Definition:![]() | The partial pressure of carbon dioxide in a person's arterial blood gas measured in millimetres of mercury. |
Data Element Concept:![]() | Person—partial pressure of carbon dioxide |
Value Domain:![]() | Millimetres of mercury NNN |
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Submitting organisation:![]() | ANZICS Database Management Committee | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Reference documents:![]() | Knaus WA, Draper EA, Bergner M, Murphy DJ, Harrell FE. The APACHE III Prognostic System: Risk Prediction of Hospital Mortality for Critically Ill Hospitalized adults. Chest 1991;100:1619-1636. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Implementation in Data Set Specifications:![]() | Intensive care DSS Health!, Recorded 14/07/2006 DSS specific information: If Partial pressure of carbon dioxide (PaCO2) in arterial blood gas is not collected or recorded, use code 999. Used in the calculation of APACHE II and APACHE III scores. Oxygenation method for APACHE II and APACHE III: When the FiO2 is less than 0.5 mmHg, record the value associated with the quantitatively lowest Partial pressure of oxygen (PaO2) only. When the Fractional value of inspired oxygen (FiO2) is 0.50 mmHg or greater, APACHE II & III scores require the use of an algorithm for oxygenation called the alveolar-arterial (A-a) gradient for determining the PaCO2 to record. All variables used in the oxygenation method calculation must come from the one blood gas sample. Acid-Base method for APACHE III: All variables used in the acid-base method calculation must come from the one blood gas sample. In conjunction with the pH of the same blood sample, the PaCO2 associated with the highest points according to the APACHE III acid-base scoring algorithm is recorded. The PaCO2 is determined from a patient’s blood collected over the first 24 hours of intensive care. APACHE III and APACHE II scores calculation – oxygenation method: For non-intubated patients or intubated patients whose FiO2 is <0.5 mmHg, record the PaCO2 associated with the arterial blood gas sample with the lowest PaO2. For intubated patients whose oxygen is >0.5 mmHg, record the PaCO2 from the arterial blood gas with the highest alveolar arterial (A-A) gradient. Use the following formula to calculate the A-a gradient: A-a gradient = 713 x FiO2 – PaO2 – PaCO2 APACHE III score calculation -acid-base scoring algorithm: In conjunction with the pH of the same blood sample, record the partial pressure of carbon dioxide associated with the highest points APACHE III acid-base scoring algorithm. The point weight score is calculated using the table below.
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