Philips MP20/30 User Manual

Calculating Cerebral Perfusion

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

Select 

 to recalculate the calibration factor using the applied pressure. 

When the monitor displays <

, remove 

the manometer tubing, syringe and extra stopcock. We recommend you replace the transducer 
dome and tubing with sterile ones.

Label the transducer with the calibration factor shown in the 

 field in the pressure’s 

setup menu.

Reconnect the patient and start measuring again.

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

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

In the 

 

menu, select 

.

In the 

 

menu, select

, 

, 

, 

 or 

as the arterial pressure source.

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.

• 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. 

Contact your service department. The pressure hardware is faulty.

Make sure that you have selected the value for 

 that 

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

Make sure that the transducer is connected and try again.

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

No valid zero. Zero the transducer.