18 - 4 BeneVision N Series Patient Monitor Operator’s Manual
temperature. See the Instruction for Use of pulmonary artery catheter to determinate. To change the
computation constant, select Comp Const and then input the correct value. When a new catheter is
used, the computation constant should be adjusted in accordance with the manufacturer’s
instructions for use.
◆ Switch on or off Auto TI. If Auto TI is switched on, the system automatically detects the injectate
temperature, and TI setting is disabled. If Auto TI is switched off, you need to input the injectate
temperature at TI.
◆ Switch on or off Auto Start. If Auto Start is switched on, the monitor automatically takes the C.O.
measurement after establishing a baseline of blood temperature. If Auto Start is switched off, you
need to click the Start button in the C.O. Measure window for a new measurement.
18.6.3 Performing C.O. Measurement
To perform the C.O. measurement, follow this procedure:
1. Select the C.O. numeric area to enter the C.O. Measure menu.
2. Proceed as follows to perform the C.O. measure:
◆ If Auto Start is switched off, select the Start button, and then inject the solution quickly when you
see the message Please Wait. As shown in the figure above, during the measurement, the currently
measured thermodilution curve is displayed. At the end of the measurement, the thermodilution
curve is transferred to one of the 6 measurement windows and the monitor prompts you to wait for a
certain period of time before starting a new measurement.
◆ If Auto Start is switched on, inject the solution quickly when you see the message Ready for new set
of measurement. The monitor consecutively takes C.O. measurements automatically without the
need for pressing the Start button between two measurements. A new thermodilution measurement
is possible as soon as the message Inject now! is displayed on the screen. The monitor automatically
detects further thermodilution measurements.
3. Acquire the average value of C.O. and C.I. A maximum of 6 measurements can be stored. If you perform
more than six measurements without rejecting any, the oldest will automatically be deleted when a
seventh curve is stored. Select from the 6 measurement curves and the system will automatically calculate
and display the averaged C.O. and C.I. values. Then select the Accept Average button to accept and store
the averaged values.
When injecting, the stopcock to the thermodilution catheter is open and the stopcock to the injectate solution is
closed. After completing the measurement, turn off the stopcock to the thermodilution catheter and turn on the
stopcock to the injectate solution, and then draw the injectate solution into the injectate syringe.
The button area also provides you with the following functions:
(1) Average values (2) Historical measurement windows
(3) Currently measurement values (4) Current C.O. curve
(5) Prompt message area (6) Buttons
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