Effect of voice therapy in sulcus vocalis: A single case study.
R Rajasudhakar
PMID 28155307WHAT IT FOUND
A man with bilateral sulcus vocalis changed after voice therapy: average pitch fell, objective voice quality moved from negative to positive, and self-rated handicap fell.
This is one case, so it cannot show the therapy works for sulcus vocalis.
Key findings
01After voice therapy, the client's average F0 changed from 181.6 Hz to 138.3 Hz.
02The dysphonia severity index changed from -2.6 to 4 after voice therapy.
03The voice handicap index score changed from 27 to 17 after voice therapy.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Only one client was studied, so the result cannot be treated as evidence that the therapy works for other clients with sulcus vocalis. Post-therapy laryngoscopy was not done, so the vocal fold anatomy after therapy could not be compared. The study reports immediate post-therapy changes, not long-term maintenance.
The easy way to misread this
Do not conclude that voice therapy works for sulcus vocalis from this paper. It is a single-subject study, and post-therapy laryngoscopy was not done, so the changes cannot be treated as evidence of a treatment effect.