Effect of positional change and inhalant anesthesia on parameters of acoustic reflectometry

Objective: Purpose of this study was to find out the effect of positional change and inhalant anesthesia on acoustic reflectometry (AR) parameters (reflectivity and curve angle). Method: AR parameters were measured on 58 ears with otitis media in sitting position before anesthesia and in supine position under inhalant anesthesia, subsequently. Results: Under anesthesia, ears with effusion disclosed more changes in reflectivity (Chi-squared analysis, χ 2-test; P0.1) than those without effusion. Further, inhalant anesthesia caused more changes in the false negative ears (63.63%) than in those with effusion having positive test before anesthesia (12.90%) ( P