Medoc PATHWAY - Figure 43: VAS Search Program Editor; Table 20: Program Parameters; VAS Search

Pathway Technical Reference Manual
Proprietary 82 of 190
Parameter
Description
Trigger
Trigger mode:
 Automatic – the stimulus will start automatically after
the defined Inter Stimulus Interval (ISI).
 Manual – The operator will initiate the onset of the
stimulus after the defined ISI (using the manual
trigger, keyboard shortcut or TTL-IN)
Standard events
Different evens which can be indicated during the test via TTL
or Sound See section7.8
Temperature events
Indicate different temperature points via TTL or Sound. See
section 7.9.
7.7.7 VAS Search
In this method, the temperature of the first stimulus rises (or falls) to a predetermined
destination, at a predetermined rate, remains there for a predetermined duration, and returns
to baseline. Patient estimation of perceived magnitude of sensation is recorded for the first
stimulus. The intensity of the next stimulus is determined by patient response being higher or
lower than the desired pain rating. For a method explanation, refer to section 2.8.7 page 36.
Figure 43: VAS Search Program Editor
The table below describes the program parameters available for the VAS Search method:
Table 20: Program Parameters
Parameter
Description
Baseline (°C)
Temperature from which each new stimulation sequence begins. Valid
range:
ATS: 10°C – 45°C
CHEPS: 30°C – 45°C