Mindray DPM 4

15-8
You can perform the following settings in this menu.
 PUMP RATE Determines the sampling rate of the CO2 module pump.
 N2O COMPEN N2O compensation
The presence of nitrous oxide causes the CO
2
value to be
higher than the actual value. Use this option to compensate
for the presence of N
2
O.
 O2 COMPEN O2 compensation
The presence of a large concentration of oxygen causes the
CO
2
value to be lower than the actual value. Use this option
to compensate for the presence of O
2
.
 Des COMPEN Desflurane compensation
The presence of desflurane causes the CO
2
value to be
higher than the actual value. Use this option to compensate
for the presence of desflurane.
NOTE
z The unit of N2O COMPEN, O2 COMPEN and Des COMPEN is “%”. The
concentration of N2O, O2 and Desflurane can be obtained from the anesthesia
machine.
z Set the N2O COMPEN, O2 COMPEN and Des COMPEN according to the
practical situation. Incorrect setting might incur errors from the actual value and
cause misdiagnosis.
 BTPS Body Temperature and Pressure, Saturated
Options: ON and OFF.
When BTPS is turned ON, the system performs BTPS compensation automatically; when BTPS
is turned OFF, the BTPS compensation is disabled.
When measuring the CO
2
content inside the patient’s lung, turn ON BTPS. Normally, the lung
temperature of the patient is 37℃ and the water vapor is sufficient or regarded as saturated. But
the temperature and water vapor content of the sampling line are different from the patient’s
exhalation. Thus, when the patient’s exhalation passes the sampling line, the accuracy of the CO
2
concentration measured by the sensor will be adversely affected. To ensure an accurate
measurement, you should turn ON the BTPS. In this mode, the system adjusts the calculation
coefficient automatically, so that the measured value is just the actual CO
2
content in the patient’s
lung.
When measuring the CO
2
content of the environment or a certain vessel, turn OFF BTPS. In the
standard ambient pressure and dry gas, the accuracy of the sensor measurement is not affected.