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Prospective, longitudinal electroglottographic study of voice recovery following accelerated hypofractionated radiotherapy for T1/T2 larynx cancer. | LitMetric
Background And Purpose : To measure voice outcomes following accelerated hypofractionated radiotherapy for larynx cancer.Materials And Methods : Twenty-five patients with T1/T2 glottic cancer underwent serial electroglottographic and acoustic analysis (sustained vowel/i/ and connected speech) before radiotherapy and 1, 6 and 12 months post-treatment. Twenty-five normal subjects served as a reference control population.Results : Pre-treatment measures were significantly worse for larynx cancer patients. Median jitter (0.23% vs 0.97%, p=0.001) and shimmer (0.62dB vs 0.98dB, p=0.05) and differences in data ranges reflected greater frequency and amplitude perturbation in the larynx cancer patients. Pre-treatment Mean Phonation Time (MPT) was significantly reduced (21s vs 14.8s, p=0.002) in larynx cancer patients. There was a trend towards improvement of jitter, shimmer and normalized noise energy at 12 months post-treatment. MPT improved but remained significantly worse than for normal subjects (21s vs 16.4s, p=0.013). Average fundamental frequency resembled normal subjects, including improvement of the measured range (91.4-244.6Hz in controls vs 100-201Hz in post-treatment larynx cancer patients).Conclusions : This non-invasive technique effectively measures post-treatment vocal function in larynx cancer patients. This study demonstrated improvement of many key parameters that influence voice function over 12 months after radiotherapy.
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