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Simplified vocal efficiency (VE) metrics, particularly SPL/Ps, show promise in tracking voice therapy outcomes for nonphonotraumatic vocal hyperfunction (NPVH). These metrics can help identify treatment effects in specific patient subgroups.

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Area of Science:

  • Speech-Language Pathology
  • Acoustic Analysis
  • Voice Disorders

Background:

  • Nonphonotraumatic vocal hyperfunction (NPVH) presents challenges in objective voice assessment.
  • Traditional vocal efficiency (VE) metrics require further validation for clinical utility.
  • Simplified VE metrics may offer more accessible outcome measures.

Purpose of the Study:

  • To evaluate simplified vocal efficiency (VE) metrics for identifying changes post-voice therapy in nonphonotraumatic vocal hyperfunction (NPVH).
  • To compare traditional VE metrics with simplified ratios (SPL/AP, SPL/Ps, SPL/AFLOW).

Main Methods:

  • Retrospective analysis of 108 adults with NPVH and 208 controls.
  • Acoustic and aerodynamic measurements (SPL, Ps, AFLOW) from consonant-vowel utterances.
  • Mixed-design ANOVA to analyze pre- to posttherapy VE changes, including subgroup analysis.

Main Results:

  • No overall VE changes observed in the NPVH group; however, subgroup analysis revealed treatment effects.
  • SPL/Ps demonstrated significant treatment effects and moved toward normative ranges.
  • Simplified VE metrics (SPL/AP, SPL/AFLOW) and traditional VE showed varying posttherapy changes.

Conclusions:

  • VE ratios, especially SPL/Ps, are potential tools for voice therapy outcome evaluation in NPVH.
  • These metrics can aid in stratifying NPVH patients by comparing them to healthy values.
  • Further research is needed to establish the role of VE metrics in NPVH assessment and management.