Predictive assessment of vocal efficiency (PAVE). A method for voice therapy outcome measurement

Effects of Resonance Voice Therapy on Hormone-Related Vocal Disorders in Professional Singers: A Pilot Study

BACKGROUND

Menstruation-related hormonal alteration can be detrimental to the professional singing voice of women. Resonance Voice Therapy (RVT) has been proven to improve vocal production. However, no research to date has been conducted examining the subjective, acoustic, and stroboscopic effects of RVT on professional female singers having premenstrual or postmenopausal voice disorders.

AIM

The aim of this study is to compare the vocal effects of RVT with a control cervical-thoracic intervention in healthy female singers during the premenstrual phase as well as in postmenopausal singers and to evaluate which intervention will allow singers to improve vocal performance regardless of changes in hormonal status.

DESIGN

A randomized study was designed for this research. The research subjects were 20 professional female singers from the Southern California area, USA, with 10 premenstrual subjects in one group and 10 postmenopausal subjects in the other group. Among each group, 5 subjects were randomly selected to receive RVT and the remaining subjects received cervical-thoracic-focused exercises. The therapies consisted of 1 month of daily 15-minute sessions. For premenstrual subjects, voice data were collected at days 25 to 27 of the premenstrual phase during a scheduled initial voice evaluation. Follow-up data were collected during the same phase of the menstrual cycle (days 25-27) after 1 month of exercises. For postmenopausal subjects, voice data were collected at an initial voice evaluation with follow-up after 1 month of the assigned voice treatment. Outcomes were assessed with the singer's voice handicap index (VHI), laryngeal videostroboscopic examination, maximum phonation time (MPT), relative average perturbation (RAP), and pitch range before and following completion of therapies. Alleviation or deterioration percentages were used for statistical analysis. Student t test was used for statistical comparison between therapies.

RESULTS

The RVT decreased singer's VHI for both premenstrual and postmenopausal subjects by an average of 67%, compared with 7.8% for the cervical-thoracic therapy. The RVT also effectively decreased RAP by an average of 57% when combining the premenstrual and postmenopausal groups. The RVT increased MPT and pitch range among both premenstrual and postmenopausal subjects. The stroboscopic examination did not detect any significant differences between the 2 interventions.

CONCLUSIONS

The RVT is effective for professional female singers with hormone-related premenstrual and postmenopausal vocal changes. The RVT is suggested as one of the therapeutic approaches for vocal abnormalities in such a population. A larger cohort may be needed for future research.

LEVEL OF EVIDENCE

1b.

Comparing voice-therapy and vocal-hygiene treatments in dysphonia using a limited multidimensional evaluation protocol

PURPOSE

This study evaluates the effectiveness of two different programs of voice-treatment on a heterogeneous group of dysphonic speakers and the stability of therapeutic progress for longterm follow-up post-treatment period, using a limited multidimensional protocol of evaluation.

METHOD

Forty-two participants with voice disorders were randomly assigned to one of two groups. Participants in group 1 received voice-therapy and participants in group 2 received a vocal-hygiene program. Vocal function was assessed before and after treatment.

RESULTS

MANOVA analysis Pillai's trace test shows significant pre-post immediate differences between treatments in favor of direct-intervention. Repeated-measures ANOVAs display significant within subjects main effect for follow-up period in the 8 measures considered. Interaction effects of group×time are also found in five out of the eight continuous variables analyzed (3 aerodynamics-acoustic and 2 self-rating), indicating differences between both treatments. Qualitative dimensions (perceptual, laryngoscopic and spectrographic assessments) also support voice-therapy superiority.

CONCLUSIONS

Results of this study suggest superiority of a voice-therapy (direct treatment) approach over a vocal-hygiene program (indirect treatment). This advantage is on the majority of the 8 continuous variables analyzed (aerodynamics, acoustic, and self-rating), including qualitative perceptual, laryngoscopic and spectrographic voice-dimensions. The stability of changes is extended during a post-treatment follow-up period.

LEARNING OUTCOMES

(1) The reader should distinguish the advantage using one type of treatment or another in clinical contexts. (2) The reader must know the most important direct techniques used in clinical treatment of voice disorders.

Voice Therapy Used to Test a Basic Protocol for Multidimensional Assessment of Dysphonia

The aim of this study was the elaboration of a basic voice protocol to discover which combination of tests and measures (multidimensional evaluation) provide decisive and essential data for the diagnosis of voice pathology and its prognosis. Voices of 21 patients with dysphonia and 21 subjects in a control group were evaluated and compared. Vocal function was assessed using a multiparametric set of videolaryngostroboscopic, perceptual, acoustic, spectrographic, aerodynamic, and subjective basic measurements (Multidimensional "Teatinos" Protocol). The dysphonic group received voice therapy for two sessions/week during 3 months. The results of the study were the following-(1) alterations in vocal function were reflected in the indicators: maximum phonation time (MPT) /a/, maximum exhalation time (MET) /s/, MPT during connect speech (MPTS), jitter, shimmer, harmonic-to-noise ratio, vocal well being (WB), self-voice assessment (SELF), vocal hygiene (HYGIENE), anxiety (ANX) and perceptual, laryngoscopic, and spectrographic explorations; (2) the indicators which are most sensitive to voice therapy are the following: MPT /a/, MET /s/, MPTS, jitter, WB, SELF, HYGIENE, ANX and perceptual, laryngoscopic, and spectrographic explorations; and (3) these positive effects were maintained or increased 4 months after termination of the treatment. Multidimensional "Teatinos" Protocol makes it possible to detect significant differences in mean values of subjective, qualitative, and objective voice assessments between dysphonic patients and control group at pre- and posttreatment stages. Therefore, multidimensional voice evaluation is a useful tool in the diagnostics of dysphonia in clinical and speech-language-therapy contexts.

Effects of Voice Therapy: A Systematic Review

Medical as well as paramedical treatments should be evaluated by scientific methods. This systematic review focuses on the effects of voice therapy, excluding pharmacological or surgical treatments. In general, statistically significant positive but modest and varying therapy effects are found. Many of these effect studies cope with diverse methodological problems. Furthermore, the conclusions of most studies cannot be generalized easily or compared to one another. As a consequence, many issues in the field of effects of voice therapy have yet been unanswered.

Vocal hygiene education, voice production therapy, and the role of patient adherence: a treatment effectiveness study in women with phonotrauma

PURPOSE

To assess the effectiveness of vocal hygiene education (VHE) and voice production therapy (VP) in altering patient perception of vocal handicap in adult women with benign, bilateral phonotraumatic vocal fold lesions and the role of adherence in that perception.

METHOD

Sixty-two women were randomly assigned to 6 weeks of VP (n = 31) or VHE (n = 31), followed by 4 weeks of self-study. The primary outcome measure was the Voice Handicap Index (VHI) score, assessed at baseline, post-therapy, and post-self-study. Patient adherence was assessed as a cofactor.

RESULTS

Both groups achieved a decrease in VHI scores from baseline to completion of the study, although the improvement was significantly greater for the VP group. The treatment effect size was large for the VP group and small for the VHE group. More participants adhered to VP than to VHE. Only adherent participants achieved significant improvement. Only adherent participants in the VP group improved with self-study. More than two thirds of the VP group achieved final VHI scores within normal limits, compared with approximately one third of those in the VHE group.

CONCLUSIONS

VP therapy may be more effective than VHE in addressing patient perception of vocal handicap in adult women with phonotrauma, and self-study may be an important component of therapy. However, adherence is a critical mediator of outcome.

Estado actual de los Servicios ORL españoles. Heterogeneidad en el manejo de los problemas de voz

The study of voice disorders present some specific difficulties such as the aetiological variability of this kind of disorders or the heterogeneity and the poor data we have about the effectiveness of certain treatments used. Research has performed different types of questionnaires in this area to obtain data about the treatments used in clinical practice. These studies have shown lack or scarce of evaluation and control methods in the rehabilitation programs that the specialists commonly use. In this report, a screening questionnaire was sent to the Otorhinolaryngology Departments of the Spanish Hospitals to obtain information about evaluation and treatment resources in voice pathologies. The results show great variability in clinical voice disorders in Spain. However we can observe a full agreement in the need to systematize this evaluation and the collaboration of the speech-therapists in the treatment of the voice disorders.

Voice therapy methods in dysphonia

Voice therapy, the behavioral approach to the treatment of disorders of voice, can take many forms. The intent of this article is to provide informative, useful, and usable information about a selected number of therapy techniques and methods. Some methods are all-inclusive and stand alone in the belief that they are adequate and appropriate for treatment of certain conditions or many conditions. The article presents a description, the rationale, key points in manner of use, concerns, and expectations for the methods and techniques described.