Pain Clinical Trial
Official title:
Pupillary Dilation Reflex (PDR) Evaluation During General Anesthesia: a Pilot Study
In this study, the pupillary dilation reflex is measured as a nociceptive indicator during elective abdominal surgery under general anesthesia.
An infrared camera of the video pupillometer measures the pupillary dilation reflex (PDR) in response of a nociceptive stimulus. This autonomic reflex, parasympathetic mediated in sedated patients, can be generated by various pain stimuli (built in standardized protocol, surgical incision, …) The PDR is a robust reflex, even in patients under general anesthesia, and provides a potential evaluation of the autonomous circuit within the nociceptive evaluation based on pupil dilation upon A-delta and C fibers in both electrical or mechanic stimulation. This mono-centric project involving American Society of Anesthesiologists (ASA) classification I-II patients undergoing elective abdominal surgery under general anesthesia are recruited. Enrolled patients perioperative undergo PDR measurements at four different standardized times. ;
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