Additional Injection Laryngoplasty for Patients With Unilateral Vocal Fold Paralysis

OBJECTIVES: In case of insufficient voice improvement after injection laryngoplasty (IL), additional IL will be one of the next option of treatments. However, little is known about the voice outcomes regarding an additional IL. STUDY DESIGN: Retrospective comparative study in single institution. METHODS: We enrolled the patients of unilateral vocal fold paralysis (UVFP), who received IL (N = 76) twice because of insufficient voice improvement. The etiologies of UVFP were related with thoracic and esophageal surgery (51.3%), neck surgery (30.3%), skull base surgery (7.9%), or unknown (10.5%). The subjective and objective voice parameters were collected before and after (mean: 5.3 months) each IL. RESULTS: Aspiration, maximum phonation time (MPT), jitter percentage, shimmer percentage, and noise to harmonic ratio (NHR) were significantly improved after both the first and second rounds of IL (P < .05). Voice handicap index (VHI)-30 was also significantly improved after both the first and second rounds of IL (P < .001). Regarding GRBAS score, overall grade of dysphonia (G), roughness (R), and breathiness (B) were significantly improved after the first IL, but only G and R after the second IL (P < .05). In comparison between postprocedural voice parameters of the first and second ILs, MPT was significantly improved from 5.5 +/- 3.5 seconds to 7.3 +/- 7.5 seconds (P = .001). Grade of dysphonia (1.9 +/- 0.8) and breathiness (1.7 +/- 0.9) of post-first IL were significantly (P < .001) improved to those of post-second IL (1.3 +/- 0.7 and 1.2 +/- 0.7, respectively). VHI-30 of post-first IL (72.0 +/- 20) was significantly improved (P < .001) to those of the second IL (57.2 +/- 23.7). CONCLUSIONS: In selected patients, additional IL could provide further improvement of voice in patient who had unsatisfactory voice results despite of initial IL. LEVEL OF EVIDENCE: 4 Laryngoscope, 2020.