A New Method in Auricular Medicine for the Investigation of the Nogier Reflex

Background: Although there is as yet no scientific consensus on this topic, the Nogier reflex or reflex auriculo-cardiac (RAC; also vascular autonomic signal) is an important method in auricular medicine. This article introduces a new methodological approach for the detection and quantification of the RAC. Methods: A new high-resolution imaging technique for the registration of pulsatory surface changes might allow the RAC to be quantified reproducibly for the first time. The method combines an innovative microscope system (available at the Medical University of Graz), video analysis software, and special image processing software (from the Beijing University of Science and Technology). Results: Even small, pulse-dependent alterations of the skin surface could be clearly visualized. Conclusion: The pilot measurement confirmed the validity of the new methodological approach. Further investigations are necessary and in progress.