Journal of voice : official journal of the Voice Foundation
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Changes in vocal function that can occur after thyroidectomy were tracked with acoustic analyses of sustained vowel productions. The purpose was to determine which time-based or spectral/cepstral-based measures of two vowels were able to detect voice changes over time in patients undergoing thyroidectomy. ⋯ This study indicated that shimmer, HNR, and CPP determined from vowel productions can be used to track changes in voice over time as patients undergo and subsequently recover from thyroid surgery, with CPP being the strongest variable for this purpose. Evidence did not clearly reveal whether acoustic voice evaluations should include both /ɑ/ and /i/ vowels, but they should specify which vowel is used to allow for comparisons across studies and multiple clinical assessments.