Mark J Robitaille

University of Wisconsin–Madison, Madison, Wisconsin, United States

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Publications (4)7.84 Total impact

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    ABSTRACT: OBJECTIVE: To modify the excised larynx bench apparatus to accommodate experiments with rabbit larynges. STUDY DESIGN: Methodological study using ex vivo rabbit larynges. METHODS: Rabbit larynges (n=5) were dissected and mounted on a custom-made phonatory apparatus. The arytenoids were adducted by rods, and humidified air was passed through the larynx to elicit vocal fold vibration. Acoustic, aerodynamic, electroglottographic (EGG), and videokymographic data were collected for each larynx. The same data were collected for five canine larynges for the purpose of comparison, and coefficients of variation were calculated for each parameter in both models. RESULTS: Reliable phonation was achieved in each larynx. Acoustic fundamental frequency (F(0)), percent jitter, percent shimmer, signal-to-noise ratio, pressure and flow at phonation onset and offset; and F(0), closed quotient, speed quotient, jitter, shimmer, and contact quotient, as recorded by EGG; and mucosal wave amplitude and phase difference are reported for rabbit larynges. Coefficients of variation for each parameter are similar in magnitude between the two models. CONCLUSION: We developed a method for recording reliable acoustic, aerodynamic, videokymographic, and EGG data from rabbit larynges. When data obtained from leporine larynges were compared with data from canine larynges, the intralarynx variability of rabbit larynges was found to be similar to that of canine larynges.
    No preview · Article · Nov 2012 · Journal of voice: official journal of the Voice Foundation
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    Xiaodi Qiu · Lan Gong · Yi Lu · Huan Jin · Mark Robitaille
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    ABSTRACT: Purpose: To determine the role of Fourier-domain optical coherence tomography (FD-OCT) in tear meniscus imaging and evaluate its diagnostic significance in Sjögren syndrome (SS), non-Sjögren’s aqueous tear deficiency (ATD) and lipid tear deficiency (LTD) patients. Methods: Two hundred and thirty-six dry eye patients and 174 healthy controls were enrolled in this study. All subjects were grouped as follows: group A (ATD), group B (LTD), group C (SS) and group D (normal controls). All subjects underwent dry eye questionnaire, FD-OCT scanning, tear film break-up time (BUT), corneal fluorescence staining and Schirmer I test (SIT). Tear meniscus height (TMH), tear meniscus depth (TMD) and tear meniscus cross-sectional area (TMA) were measured using FD-OCT (RTVue-100). The area under the receiver operating characteristic curve and the cut-off point were determined using a logistic regression model. Results: Mean TMH, TMD, TMA, BUT and SIT of dry eye patients were significantly lower than those of the controls (p < 0.05). Tear meniscus values were significantly decreased in patients with SS compared with ATD and LTD patients. Tear meniscus values were significantly correlated with clinical examination results in all groups. Accuracy of dry eye diagnosis by FD-OCT is highest in patients with SS and lowest in LTD patients. The clinical diagnostic critical points were quite different between groups. Conclusions: Fourier-domain optical coherence tomography could provide precise measurement of the tear meniscus with favourable repeatability. Diagnostic significance is more conspicuous in patients with SS. Tear meniscus measurement by FD-OCT is expected to become a valuable technique in ATD dry eye screening and diagnosis.
    Preview · Article · May 2012 · Acta ophthalmologica
  • Meiyan Li · Min Zhu · Yongfu Yu · Lan Gong · Naiqing Zhao · Mark J Robitaille
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    ABSTRACT: Conjunctival autograft transplantation (CAT) and amniotic membrane transplantation (AMT) are two widely used techniques for pterygium treatment. However, previous studies comparing the outcomes of CAT and AMT have generally had small sample sizes and conflicting results. The aim of this report was to evaluate and comment on peer-reviewed literature for evidence of effectiveness and safety of CAT and AMT for management of pterygium. Studies comparing outcomes of CAT and AMT for pterygium treatment were identified by searching PubMed, Embase, Web of Knowledge, and a search of all references in relevant papers. Two reviewers confirmed study eligibility and extracted data independently, and data were pooled using standard meta-analysis techniques. Five eligible studies reporting outcomes in 538 eyes were included. The pooled hazard ratio (HR) estimate for recurrence of CAT compared to AMT was 0.30 (95% confidence interval (CI) [0.16, 0.59], p < 0.001) and 0.22 (95%CI [0.02, 2.37], p = 0.214), respectively, for primary and recurrent pterygium. For unacceptable appearance, the pooled HR estimate was 0.33 (95% CI [0.16, 0.66], p = 0.002). There were no statistically significant differences in adverse events (odds ratio (OR) = 0.96, 95% CI [0.46, 1.97], p = 0.901). Available trials indicate that CAT has lower recurrence risk compared to AMT for primary pterygium treatment, as well as lower risk of unacceptable appearance risk.
    No preview · Article · Sep 2011 · Albrecht von Graæes Archiv für Ophthalmologie
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    Michael F Regner · Mark J Robitaille · Jack J Jiang
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    ABSTRACT: The purpose of this study was to compare the vocal fold vibratory characteristics of ex vivo bovine, canine, ovine, and porcine larynges to human male and female vocal fold vibrations to determine the best model organism for laryngeal studies concerning vibratory and kinetic characteristics. Prospective experimental. High-speed videos of phonation were gathered at 4,000 frames per second (fps) in the animal models and human high-speed endoscopy data were gathered at 2,000 fps. Videos were converted into kymograms, and the amplitude, oscillation frequency, and phase difference of vocal fold vibration were measured. No statistically significant differences were found with respect to frequency, amplitude, or phase difference between canines and humans. Porcines were not significantly different from human females but did have an oscillation frequency significantly different from human males. Ovine vibrational amplitudes were significantly different from humans, and bovine frequency and amplitude differed significantly from humans. Canine and porcine larynges are the most appropriate model specimens for laryngeal studies contingent on vibratory or kinetic properties of phonation.
    Full-text · Article · Jun 2010 · The Laryngoscope