24 Calculations
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Entering Values for Calculations
The monitor automatically enters any available values for calculations. For aperiodically-measured
values such as C.O., the monitor will re-use the most recent value in the calculation database until a
new value becomes available. If the calculation time is the last C.O. time, values will be used from up
to and including 30 minutes before the C.O. time, except for height and weight where the last available
value will be used.
• To enter calculations values manually or edit automatically-entered values, select the value field to
open the on-screen keyboard and use this to enter the correct value. Values edited manually are
marked with an asterisk (*).
If you enter a value that has more decimal places than allowed for a particular input, the value you
enter will be rounded off after you select
Enter. If you enter a value which cannot be stored, the
message
Value out of range will appear. Enter a new value.
In hemodynamic calculations, if the systolic and diastolic pressures are manually entered, the mean
pressure is calculated and marked with an asterisk (*). The formula used to estimate the mean pressure
is:
[systolic + (diastolic x 2)] / 3.
Automatic Value Substitution
If the monitor cannot find a value required for calculation, it automatically tries to find an equivalent
source for this value. For example, if C.O. is required but unavailable, the monitor automatically looks
for CCO as a alternative source of C.O. values, or an alternative Pressure label may be used instead of
ABP. The label of the value in the
Calculations window does not change. Substituted values are
marked with an asterisk (*).
If a PAWP value is not available, PAWP will be set to zero in the formulas where it is used.
Automatic Unit Conversion
The monitor needs consistent units for performing calculations. It automatically converts units where
necessary before it performs the calculation, for example, pressures sourced in kPa, cmH
2
O, or mbar
are automatically converted to mmHg, or to cmH
2
O for ventilation calculations.
Manual Unit Conversion
If you need to convert units for other purposes you can use the Unit Conversion window:
1 Select Main Setup then select Calculations.
2 Select Unit Conversion.
3 Select the field under the unit you know and use the on-screen keypad to enter the known value.
The converted value automatically appears in the adjacent field.
BSA Formula
Your monitor provides both the Boyd and Dubois formulas for the calculation of body surface area
(BSA). For calculations, the monitor uses the setting defined in the
Patient Demographics menu. All
calculation results that use BSA are indexed to the selected formula.
• To check the current setting, select the patient name to enter the
Patient Demographics menu.
BSA(B) indicates that the Boyd formula is used; BSA(D) indicates that the Dubois formula is used.
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