Medoc PATHWAY - Page 83

Pathway Technical Reference Manual
Proprietary 83 of 190
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.
First destination
temperature (°C)
Temperature of first stimulus. Valid range may be limited by safety
restrictions, rate and duration time. Valid range (under no
restrictions):
ATS: 0°C – 55°C (-10°C – 55°C under special license)
CHEPS: 30°C – 55°C (20°C – 55°C under special license)
Destination Rate
(°C/sec)
Temperature change rate from baseline to destination. Valid range:
ATS: 0°C/sec – 8°C/sec
CHESP: 0°C/sec – 40°C/sec (max 70°C for heating).
Duration Time (sec)
Duration time at destination temperature. Valid range may be limited
by safety restrictions.
Valid range (under no restrictions): 0 – 600 seconds.
Return Rate
Temperature change rate from destination to baseline. Valid range:
ATS: 0°C/sec – 8°C/sec
CHESP: 0°C/sec – 40°C/sec (max 70°C for heating).
Search Mode
Search mode:
 Automatic – starting from the second trial, the stimulus
parameters will be defined automatically by the predetermined
target pain rating and step size.
 Manual – At the end of each trial the user will define the
destination temperature of the next trial, until the desired pain
rating is reached. The user also decides when to finish the
program (i.e. when the desired pain rating is achieved). In
manual mode the 'Target Pain Rating' and 'Step size'
parameters become dimmed.
Target Pain Rating
Relevant for Automatic search mode only.
Defines the pain rating that needs to be reached. If the actual pain
rating of the current trial is lower than 'Target Pain Rating' value, the
temperature of the next trial will increase by the Step Size (see
below) and vice versa.
Valid range: 1 - 100
Step Size (°C)
Relevant for Automatic search mode only.
Determines the step size by which the temperature will increase/
decrease in every new trial. The direction of the temperature change
will depend on the difference between the target and the actual pain
ratings (see above in 'Target Pain Rating' description)
Valid range: 0.1 – 10 (°C)
ISI Min (sec)
Minimum Inter-Stimulus-Interval (ISI). Valid range: 0 to 600 (sec)
ISI Max (sec)
Maximum Inter-Stimulus-Interval (ISI). Valid range: 0 to 600 (sec).
Actual ISI will be randomized between min and max values.
Standard Events
Different events which can be indicated during the test via TTL or
Sound. See section 7.8