Limits...
Velar activity in individuals with velopharyngeal insufficiency assessed by acoustic rhinometry.

Trindade IE, Araújo BM, Teixeira AC, Silva AS, Trindade-Suedam IK - J Appl Oral Sci (2014 Jul-Aug)

Bottom Line: VP activity (ΔV) was estimated by the absolute and relative differences between nasopharyngeal volume at rest (Vr) and during an unreleased/k/ production (Vk).Mean Vk and Vr values (± SD) obtained were: 23.2 ± 3.6 cm3 and 15.9 ± 3.8 cm3 (AVF group), and 22.7 ± 7.9 cm3 and 20.7 ± 7.4 cm3 (IVF group), corresponding to a mean ΔV decay of 7.3 cm3 (31%) for the AVF group and a significantly smaller ΔV decay of 2.0 cm3 (9%) for the IVF group (p < 0.05).Seventy percent of the IVF individuals showed a ΔV suggesting impaired VP function (below the cutoff score of 3.0 cm3 which maximized both sensitivity and specificity of the test), confirming clinical diagnosis.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo.

ABSTRACT

Unlabelled: Acoustic rhinometry is routinely used for the evaluation of nasal patency.

Objective: To investigate whether the technique is able to identify the impairment of velopharyngeal (VP) activity in individuals with clinical diagnosis of velopharyngeal insufficiency (VPI).

Methods: Twenty subjects with repaired cleft palate and inadequate velopharyngeal function (IVF) and 18 non-cleft controls with adequate velopharyngeal function (AVF), adults, of both genders, were evaluated. Area-distance curves were obtained during VP rest and speech activity, using an Eccovision Acoustic Rhinometry system. Volume was determined by integrating the area under the curve at the segment corresponding to the nasopharynx. VP activity (ΔV) was estimated by the absolute and relative differences between nasopharyngeal volume at rest (Vr) and during an unreleased/k/ production (Vk). The efficiency of the technique to discriminate IVF and AVF was assessed by a ROC curve.

Results: Mean Vk and Vr values (± SD) obtained were: 23.2 ± 3.6 cm3 and 15.9 ± 3.8 cm3 (AVF group), and 22.7 ± 7.9 cm3 and 20.7 ± 7.4 cm3 (IVF group), corresponding to a mean ΔV decay of 7.3 cm3 (31%) for the AVF group and a significantly smaller ΔV decay of 2.0 cm3 (9%) for the IVF group (p < 0.05). Seventy percent of the IVF individuals showed a ΔV suggesting impaired VP function (below the cutoff score of 3.0 cm3 which maximized both sensitivity and specificity of the test), confirming clinical diagnosis.

Conclusion: Acoustic rhinometry was able to identify, with a good discriminatory power, the impairment of VP activity which characterizes VPI.

Show MeSH

Related in: MedlinePlus

Tracing A shows two superimposed rhinograms obtained during VP rest and activity.Divergence between curves indicates velar and/or pharyngeal movement. Tracings (B)and (C) show the segments used to determine the nasopharyngeal volume (Vk and Vr)by integration of the area under the curve
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4126829&req=5

f02: Tracing A shows two superimposed rhinograms obtained during VP rest and activity.Divergence between curves indicates velar and/or pharyngeal movement. Tracings (B)and (C) show the segments used to determine the nasopharyngeal volume (Vk and Vr)by integration of the area under the curve

Mentions: Nasal cross-sectional areas from the nostril to the nasopharynx are calculated by thesoftware based on the reflected sound intensity. Distances of the segments in relationto the nostrils are calculated based on the wave speed and time of arrival. Data areconverted into an area-distance function and represented on the computer screen as agraph, the rhinogram, in which the area (in cm2) is presented in asemi-logarithmic scale on the y axis and the distance (in cm) is presented on the x axis(Figure 2A). Volumes are calculated byintegrating the area under the curve (Figures 2Band 2C). The software calculates the meansectional areas and volumes of the ten repetitions.


Velar activity in individuals with velopharyngeal insufficiency assessed by acoustic rhinometry.

Trindade IE, Araújo BM, Teixeira AC, Silva AS, Trindade-Suedam IK - J Appl Oral Sci (2014 Jul-Aug)

Tracing A shows two superimposed rhinograms obtained during VP rest and activity.Divergence between curves indicates velar and/or pharyngeal movement. Tracings (B)and (C) show the segments used to determine the nasopharyngeal volume (Vk and Vr)by integration of the area under the curve
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126829&req=5

f02: Tracing A shows two superimposed rhinograms obtained during VP rest and activity.Divergence between curves indicates velar and/or pharyngeal movement. Tracings (B)and (C) show the segments used to determine the nasopharyngeal volume (Vk and Vr)by integration of the area under the curve
Mentions: Nasal cross-sectional areas from the nostril to the nasopharynx are calculated by thesoftware based on the reflected sound intensity. Distances of the segments in relationto the nostrils are calculated based on the wave speed and time of arrival. Data areconverted into an area-distance function and represented on the computer screen as agraph, the rhinogram, in which the area (in cm2) is presented in asemi-logarithmic scale on the y axis and the distance (in cm) is presented on the x axis(Figure 2A). Volumes are calculated byintegrating the area under the curve (Figures 2Band 2C). The software calculates the meansectional areas and volumes of the ten repetitions.

Bottom Line: VP activity (ΔV) was estimated by the absolute and relative differences between nasopharyngeal volume at rest (Vr) and during an unreleased/k/ production (Vk).Mean Vk and Vr values (± SD) obtained were: 23.2 ± 3.6 cm3 and 15.9 ± 3.8 cm3 (AVF group), and 22.7 ± 7.9 cm3 and 20.7 ± 7.4 cm3 (IVF group), corresponding to a mean ΔV decay of 7.3 cm3 (31%) for the AVF group and a significantly smaller ΔV decay of 2.0 cm3 (9%) for the IVF group (p < 0.05).Seventy percent of the IVF individuals showed a ΔV suggesting impaired VP function (below the cutoff score of 3.0 cm3 which maximized both sensitivity and specificity of the test), confirming clinical diagnosis.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo.

ABSTRACT

Unlabelled: Acoustic rhinometry is routinely used for the evaluation of nasal patency.

Objective: To investigate whether the technique is able to identify the impairment of velopharyngeal (VP) activity in individuals with clinical diagnosis of velopharyngeal insufficiency (VPI).

Methods: Twenty subjects with repaired cleft palate and inadequate velopharyngeal function (IVF) and 18 non-cleft controls with adequate velopharyngeal function (AVF), adults, of both genders, were evaluated. Area-distance curves were obtained during VP rest and speech activity, using an Eccovision Acoustic Rhinometry system. Volume was determined by integrating the area under the curve at the segment corresponding to the nasopharynx. VP activity (ΔV) was estimated by the absolute and relative differences between nasopharyngeal volume at rest (Vr) and during an unreleased/k/ production (Vk). The efficiency of the technique to discriminate IVF and AVF was assessed by a ROC curve.

Results: Mean Vk and Vr values (± SD) obtained were: 23.2 ± 3.6 cm3 and 15.9 ± 3.8 cm3 (AVF group), and 22.7 ± 7.9 cm3 and 20.7 ± 7.4 cm3 (IVF group), corresponding to a mean ΔV decay of 7.3 cm3 (31%) for the AVF group and a significantly smaller ΔV decay of 2.0 cm3 (9%) for the IVF group (p < 0.05). Seventy percent of the IVF individuals showed a ΔV suggesting impaired VP function (below the cutoff score of 3.0 cm3 which maximized both sensitivity and specificity of the test), confirming clinical diagnosis.

Conclusion: Acoustic rhinometry was able to identify, with a good discriminatory power, the impairment of VP activity which characterizes VPI.

Show MeSH
Related in: MedlinePlus