Previously, there was some interest in the use of spectral analysis of respiratory sounds for the diagnosis of upper airway collapse 136–138 and repeated recordings have been used to measure changes in respiratory sounds following laryngeal surgery. The recording of respiratory sounds is useful to relate the sounds being reported by the owner or trainer with dynamic events occurring within the airway. This can be performed using a microphone placed in front of the horse's nostrils, either within a mask or attached to the bridle.
Often respiratory sounds are measured concurrently with the videoendoscopy recording. Samantha Franklin, Kate Allen, in Equine Sports Medicine and Surgery (Second Edition), 2014 Respiratory sound recording and analysis
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