Rachel E. Witt

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OBJECTIVES The minimum airflow necessary to initiate stable vocal fold vibration--phonation threshold flow (PTF)--may increase as exposure to dry air increases. A critical period of dehydration may exist after which phonation can no longer be initiated. METHODS We collected PTF data for 11 excised canine larynges mounted on a bench apparatus. Trials(More)
OBJECTIVE In this study, a Voice over Internet Protocol (VoIP) communication based on G.729 protocol was simulated to determine the effects of this system on acoustic perturbation parameters of normal and pathological voice signals. PATIENTS AND METHODS Fifty recordings of normal voice and 48 recordings of pathological voice affected by laryngeal(More)
OBJECTIVE Evaluate the effect of vocal fold surface dehydration on mucosal wave amplitude and frequency. STUDY DESIGN Controlled test-retest. SETTING Larynges were mounted on an excised larynx phonation system and attached to a pseudolung in a triple-walled sound-attenuated room that eliminated background noise and maintained a stabilized room(More)
In the neural retina, glial cells control formation of ionic gradients by mediating transmembrane water fluxes through aquaporin (AQP) water channels. Retinal content and immunolocalization of two water channels, AQP1 and AQP4, in the diabetic rat retinas during high-salt loading were examined in this study. Diabetes was induced by an intraperitoneal(More)
OBJECTIVES We evaluated the efficacy of the titanium vocal fold medializing implant (TVFMI) for the treatment of unilateral vocal fold paralysis (UVFP) on the basis of acoustic, aerodynamic, and mucosal wave measurements in an excised larynx setup. METHODS Measurements were recorded on 8 excised canine larynges with simulated UVFP before and after(More)
PURPOSE To investigate the variation of macular light sensitivity (MLS) in myopic Chinese adults by using microperimetry. METHODS MLS was recorded with the MP1 microperimeter (Nidek Technologies, Padova, Italy) in eyes affected by various degrees of myopia. Subjects were divided into group A (18-30 years) and group B (31-60 years). Subjects in both age(More)
OBJECTIVES This study aims to compare retinal vessel anatomy of normal rhesus monkeys and humans and to provide a basis from a structural perspective for the use of rhesus monkey as an experimental model in future studies of retinal vessels. METHODS The retinas of six normal rhesus monkey eyes and eight human eyecups following corneal transplantation were(More)
HYPOTHESIS The optimal degree of arytenoid rotation for arytenoid adduction (AA) can be determined using quantitative real-time voice analysis. STUDY DESIGN Repeated measures with each larynx serving as its own control. METHODS Unilateral vocal fold paralysis (VFP) was modeled in five excised canine larynges. Medialization laryngoplasty (ML) was(More)