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User Manual AlgiScan 17
Measurement protocols
The different modes will allow the pupil to be measured over a variable period of
time depending on the protocol chosen, with or without stimulation. In these different modes,
the operator starts measuring by pressing the main button continuously (the button is held
down throughout the measurement) after selecting the desired mode (“Flash”, “Tetanus”,
“PRD”, “PPI”). While recording, the seconds are counted down and displayed on the AlgiScan
screen. An audible beep indicates the start and finish of the recording (or measurement).
To ensure the quality of the results, the same precautions need to be respected as for an
instantaneous measurement:
• The pupil must be fully visible throughout the recording
• The pupil must be centred on the AlgiScan screen
• The green zone covering the pupil must remain homogeneous and stable.
« Flash » mode: The pupil reactivity is tested with a calibrated flash of light (photomotor
reflex). Press the main button for 4 sec to start acquiring data. The stimulation is done with a
flash of light. The objective is to measure the pupillary reactivity to light.
« Tetanus » mode: It is a test of the patient’s pupil reactivity to an adjustable continuous
electrical stimulation (the reactivity of the patient’s pupil is recorded simultaneously to the
electrical stimulation).
This mode is used to measure the pupil reactivity to a standardized electrical stimulation.
Before starting the user selects the intensity of the electrical stimulation which will be applied
and makes sure it is innocuous for the patient.
(see Section : Selecting the measurement protocol)
« PRD » mode: It is a protocol to record the pupil size variation (the pupil is filmed with no
stimulation).
With this mode the variations of the pupil size are recorded during 60s in the course of medical
or surgery acts.
« PPI » mode: Evaluation of the patient’s level of sensitivity to nociception.
With this mode the patient’s level of analgesia is measured with the PPI scale. Before use, the
operator will check that the patient is in suitable conditions to withstand the different levels of
PPI mode stimulation and ensure that they are safe for the patient.
Before launching a measurement protocol, check that the selected protocol corresponds to
the desired one (“Flash”, “Tetanus”, “PRD” or “PPI”). If it is not the case, select the symbol of the
desired test (see the section: Selecting the Measurement Protocol).
The default protocol is shown on the right side of the screen. Before starting recording the
AlgiScan must be positioned on the patient and must detect the pupil correctly for at least 2
seconds to leave time to the pupil to adapt its size with the darkness.
Caution: before using the device, check the type of stimulation chosen, its intensity and
its innocuousness regarding the patient. For more information on these operations refer
to the following chapter.