Mean BP
| Data Element (edit) | |
| Field Name: | MBP |
| 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 |
| Data type: | number |
| Length: | single |
| Program: | CC |
| Created/Raw: | Created |
| Start Date: | 1988-07-11 |
| End Date: | 2300-01-01 |
| Sort Index: | 13 |
Mean Blood Pressure defined by round(((2x Diastolic) + Systolic)) ÷ 3)
The mean Blood Pressure BP as collected for the APACHE II score is calculated as follows:
Mean BP = round(((2x Diastolic) + Systolic)) ÷ 3)
Rounding may not be part of the original definition of Mean BP, but it is how we do it in order to get integers that work with the Apache Ranges.
| Apache Physiological Variable | |
| variable name | mean blood pressure |
| unit | mmHG |
| absolute max allowed | |
| warning max | |
| high score 4 | >=160 |
| high score 3 | >=130 and <160 |
| high score 2 | >=110 and <130 |
| high score 1 | |
| score 0 | >=70 and <110 |
| low score 1 | |
| low score 2 | >=50 and <70 |
| low score 3 | |
| low score 4 | <49 |
| 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.
Collection Instructions for mean arterial BP
- The data collector is responsible to collect from the chart, the worst BP (be it high or low) during the first 24 hours in ICU.
- there is a BP Helper button to help pick the Sys/Dia combination for the worst mean BP
- The APACHE II score is based on the worst calculated mean BP.
- The mean BP is automatically in CFE.
- when selecting the worst BP, you must also take into account #artificially changed BPs
- If BP is not available from the chart because of short stay or death, see Apache_II_General_Collection_Guidelines#Missing_Values_Rule_for_APACHE_II
artificially changed BPs
See General Collection Guidelines for Apache II#When to collect for which value to use. We don't want values that are changed by interventions already, for example if a patient is in septic shock, you would want the lowest BP as opposed to the highest BP that is artificially enhanced by inotropes.
Blood Pressure when on IAPB (intra aortic balloon pump)
We want the worst value in the 1st 24 hrs in ICU, so if possible get the pre IABP BP.
If only post IABP BPs are available, use peripheral arterial BP, not aortic pressure.