18-6
18.4.3 Calculated Parameters and Formulas
Abbreviation Unit Full spelling Formula
PAO
2
mmHg partial pressure of oxygen in the alveoli
(ATMP－47) × FiO
2
/100 －PaCO
2
× [FiO
2
/100 ＋ (1－FiO
2
/100) / RQ ]
AaDO
2
mmHg alveolar-arterial oxygen difference
PAO
2
－ PaO
2
Pa/FiO
2
mmHg oxygenation ratio 100 × PaO
2
/ FiO
2
a/AO
2
% arterial to alveolar oxygen ratio 100 × PaO
2
/ PAO
2
MV L/min minute volume (TV × RR) / 1000
Vd ml volume of physiological dead space
TV × (1 － PeCO
2
/ PaCO
2
)
Vd/Vt % physiologic dead space in percent of tidal volume 100 × Vd/TV
VA L/min alveolar volume
(TV－ Vd) × RR / 1000
18.5 Hemodynamic Calculations
18.5.1 Performing Calculations
To perform a hemodynamic calculation:
1. Select [Main Menu]→[Calculations >>]→[Hemodynamic >>], or select [Calculations] QuickKey→
[Hemodynamic >>].
2. Enter values for calculation.
For a patient who is being monitored, [HR], [Art mean], [PA mean] and [CVP] are automatically taken from
the currently measured values. If you just have performed C.O. measurements, [C.O.] is the average of
multiple thermodilution measurements. [Height] and [Weight] are the patient’s height and weight you
have entered. If the monitor does not provide these values, their fields appear blank.
For a patient who is not being monitored, confirm the values you have entered.
3. Select the [Calculate] button. The system performs a calculation per the current settings and displays the
calculated values.
If a calculated value is outside the range, its background will highlight in yellow. You can select [Range] to
view its normal range in the unit field.
Invalid values are displayed as [---].
In the [Hemodynamic Calculation] window, you can:
Trigger a recording by selecting the [Record] button. The currently displayed renal calculations are printed out
by the recorder.
Review the previously performed calculations by selecting [Review].
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