Mindray BeneView T1, Operator'S Manual

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16-6
2. Select the [ Start ] button and inject the bolus rapidly (<7sec) and smoothly as soon as the message [ Inject xx ml! ]
and prompt tone appear.
As shown in the figure above, during the measurement, the currently measured thermodilution curve is displayed.
At the end of the measurement, the measured values are displayed in the history window and the monitor prompts
you to wait for a certain period of time before starting a new measurement. The
△
T value should be greater than
0.15°C to ensure high accuracy. A low
△
T can be caused by a very high ELWI or an extreme low CI. If
△
T is too low,
you can try to increase it by

Injecting more volume (remember to reenter the injectate volume in [ PiCCO Guide>> ] menu before
injecting).

Injecting colder bolus.

Injecting the bolus in a shorter time.
3. Perform 3 to 5 single measurements direct after each other within a maximum of 10 minutes as described in Step 2.
A new measurement is available when you see the blood temperature is steady in the [ PiCCO Measurement ]
window.

If you’ve selected [ Manual ] measure in the [ PiCCO Guide>> ] menu, you should repeat Step 2 manually.

If you’ve selected [ Auto ] measure in the [ PiCCO Guide>> ] menu, the C.O. measurements can be performed
consecutively, without the need for pressing the [ Start ] button between measurements. A new
thermodilution measurement is possible as soon as [ Inject xx ml! ] is displayed on the screen. The patient
monitor automatically detects further thermodilution measurements.
A maximum of 6 measurements can be stored. If you perform more than six measurements without rejecting any, the
oldest will be automatically deleted when a seventh curve is stored. Select the measurement values and the system will
automatically perform calibration and calculate the averaged CCO and CCI values.
CAUTION

Three to five single thermodilution measurements within 10 minutes are recommended. For a stable patient
it is recommended to perform a thermodilution measurement every 8 hours. For an unstable patient it may
be necessary to perform thermodilution measurements more frequently in order to determine the patient's
volume status and to recalibrate the continuous determination of C.O.

As the pulse contour cardiac output of children has not been sufficiently validated thus far, the C.O. should
be checked by thermodilution before therapeutic interventions.

If the system can not get a reliable pArt value during a C.O. measure, the corresponding C.O. value is invalid
for CCO calibration.

Recalibration is recommended with significant changes in hemodynamic conditions, such as volume shifts
or changes to medication.

If the option of the auto pCVP measurement is not used, pCVP should be updated as soon as a new value is
obtained to accurately calculate SVR and CCO.

If the displayed continuous parameters are not plausible, they should be checked by a thermodilution
measurement. The CCO measurement will be recalibrated automatically.

Faulty measurements can be caused by incorrectly placed catheters, interfering signal transmission e.g. of
arterial pressure, defective connections or sensors, or by electromagnetic interference (e.g. electric
blankets, electric coagulation).

Aortic aneurysms may cause the displayed blood volume (GEDV/ITBV) derived by thermodilution
measurement to be erroneously high if the arterial thermodilution catheter is placed in the femoral artery.