Calculating Cerebral Perfusion

12 Monitoring Invasive Pressure

5Select the calibration pressure from the list, for example 200 mmHg.

6Select Confirm to recalculate the calibration factor using the applied pressure.

7When the monitor displays <Press> calibration done at <date and time>, remove the manometer tubing, syringe and extra stopcock. We recommend you replace the transducer dome and tubing with sterile ones.

8Label the transducer with the calibration factor shown in the Cal. Factor field in the pressure’s setup menu.

9Reconnect the patient and start measuring again.

Troubleshooting the Pressure Calibration

The status line lists the probable cause of an unsuccessful calibration.

 

Message

 

 

Corrective Action

 

 

 

 

 

 

unable

to

calibrate -

Contact your service department. The pressure hardware is faulty.

 

equipment

malfunction

 

 

unable

to

calibrate -

Make sure that you have selected the value for Cal. Press that

 

out of

range

you are applying to the transducer, and repeat the calibration.

 

unable to calibrate - no

Make sure that the transducer is connected and try again.

 

transducer

 

 

 

unable

to

calibrate -

Make sure there are no disturbances to the transducer, and repeat

 

unstable signal

the calibration.

 

unable

to

calibrate -

No valid zero. Zero the transducer.

 

perform zero first

 

 

 

 

Calculating Cerebral Perfusion

The monitor can calculate the difference between mean arterial pressure and the intracranial pressure. The difference is labeled CPP.

1In the Main Setup menu, select Measurements.

2In the Setup CPP menu, select ABP, ART, Ao, BAP or FAP as the arterial pressure source.

Calculating Pulse Pressure Variation

Note: The derived measurement Pulse Pressure Variation is not available in the USA.

Pulse Pressure Variation (PPV) is calculated from beat-to-beat arterial pressure values. Pulse pressure is the difference between the systolic and the diastolic pressure values for a single beat. The average variation in pulse pressure is calculated over periods of 32 seconds.

WARNING • This monitor can calculate PPV from beat-to-beat values of any arterial pulsatile pressure. The circumstances under which the calculation of a PPV value is clinically meaningful, appropriate and reliable must be determined by a physician.

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Philips MP60/70/80/90, MP20/30, MP40/50 manual Calculating Cerebral Perfusion, Calculating Pulse Pressure Variation

MP60/70/80/90, MP40/50, MP20/30 specifications

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