Download VII. POLYSOMNOGRAPHY PROTOCOL

3.
Place the air temperature thermistor over the infant's head 30 to 70 cm above the face. The method
of securing this thermistor will be dependent upon the arrangements used at the particular center
where the study is being carried out, but it is important that the thermistor be in a position where it
will not be bumped by care-givers during the study.
4.
The instrument can then be switched on using the power switch located under the selector knob on
the front panel. The switch is in the "on" position when the toggle is pointing upward, and the
power light (PWR) is lit. This is not a bright light, so it may be difficult to see in a bright room. If
this light is not lit, it is necessary to change batteries before proceeding any further. Instructions for
this are given in the next section.
5.
The selector knob is used to check the calibration of the instrument. After the instrument is
switched on, the selector should be set to 20. This is done by pushing in on the knob and turning
until the white pointer points to the number 20 on the panel. After a few seconds the digital
indicator on the panel should read 20.0. Due to the least significant figure error of this type of
instrument, the panel may indicate 20.1 or 19.9, but this will be within the accuracy of the
instrument. If a number that is not close to 20 appears, the instrument is not working correctly, and
you should contact the CHIME engineer on call. Now move the selector switch to the position
labeled "30". The panel meter should ideally give the reading of 30.0, but 29.9 and 30.1 are equally
acceptable. Now move the selector switch to the number 40, and the panel display should indicate
39.9, 40.0, or 40.1. This completes the calibration check, and the selector switch should be returned
to the position labeled "OP". The instrument is now ready for operation.
6.
The switch to the immediate right of the skin thermistor connector determines whether the
instrument is measuring the air temperature and the skin temperature (the "A/S" position of the
switch) or just measuring the air temperature (the "A" Position). Choose the position that you will
use for the PSG study. It is recommended that the A/S position be used.
7.
The digital display on the front panel will now show the temperature of either the air probe or the
skin probe. Each is displayed for 20 seconds. When the instrument is set up for both air and skin
temperature the first 20 second segment after it is turned on gives the air temperature, followed by
20 seconds of the skin temperature and repeating. Although it is difficult to know which is which by
looking at the digital display, it will be quite clear on the ALICE 3 screen, since the skin temperature
will be at a higher level than the air temperature.
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