Voz hipernasal y regurgitación nasal aguda: reporte de un caso clínico y revisión de la literatura / Hypernasal speech and acute nasal regurgitation: a case report and a review of the literature

RESUMEN La voz hipernasal y la regurgitación nasal son síntomas de disfunción velofaríngea. Ésta puede tener múltiples causas: anatómicas, neurológicas o funcionales. Se describe el caso de una paciente de sexo femenino, de 13 años, que se presenta con voz hipernasal y regurgitación nasal aguda. Al examen físico se evidencia inmovilidad del velo del paladar derecho sin otros hallazgos neurológicos. El estudio con resonancia nuclear magnética de cerebro y punción lumbar fueron normales. Se diagnosticó una incompetencia velofaríngea aguda transitoria, de probable etiología viral. La paciente evolucionó de forma favorable con mejoría clínica progresiva. La incompetencia velofaríngea a causa de una paresia o parálisis del nervio vago y/o nervio glosofaríngeo es una causa poco frecuente de disfunción velofaríngea.

ABSTRACT Hypernasal speech and nasal regurgitation are symptoms of velopharyngeal dysfunction. This may have multiple causes, including velopharyngeal incompetence due to paresis or paralysis of the vagus nerve and/or glossopharyngeal nerve. We describe the case of a 13 year-old female patient, with hypernasal speech and acute nasal regurgitation, with a physical examination showing immobility of the right palate with no other neurological findings. Magnetic resonance imaging of the brain and lumbar puncture was normal. Transient acute velopharyngeal incompetence was diagnosed, probably of viral etiology. The patient evolved favorably with progressive clinical improvement. Velopharyngeal incompetence due to paresis or paralysis of the vagus and/or glossopharyngeal nerves is a rare cause of velopharyngeal dysfunction.

The Role of Obstruction Length and Height in Predicting Outcome of Velopharyngeal Surgery.

OBJECTIVE: To measure obstruction length and height using drug-induced sleep endoscopy (DISE) in obstructive sleep apnea (OSA) patients and to evaluate their association with outcomes of velopharyngeal surgery. STUDY DESIGN: Prospective cohort study. SETTING: University medical center. METHODS: Forty-three consecutive patients with OSA were evaluated by DISE using dexmedetomidine. The 2 new parameters, obstruction length (defined as the distance from the most superior point of the collapse to the most inferior point of the collapse) and obstruction height (the distance from the posterior border of the nasal septum to the most proximal point of the collapse), were measured by both DISE and a pressure transducer catheter method before surgery. All of the patients received velopharyngeal surgery, including revised uvulopalatopharyngoplasty with uvula preservation and transpalatal advancement pharyngoplasty. We followed up with all of the patients using polysomnography at least 3 months after surgery. RESULTS: Twenty-six (60.5%) patients were responders, and 17 (39.5%) were nonresponders. The mean obstruction length and obstruction height were 1.3 ± 0.5 cm (range, 0.4-2.2 cm) and 3.4 ± 0.9 cm (range, 1.1-5.0 cm), respectively. Nonresponders had a longer obstruction length and a shorter obstruction value. Multivariate logistic regression analysis revealed that obstruction length >1.4 cm (odds ratio [OR], 0.21; 95% confidence interval [CI], 0.04-0.98; P = .048) and obstruction height ≥3.2 cm (OR, 9.35; 95% CI, 1.79-48.80; P = .008) were the only independent predictors of velopharyngeal surgery success. CONCLUSIONS: Accurate measurement of obstruction length and height can be performed with both DISE and a pressure transducer catheter method. The 2 parameters can predict the outcome of velopharyngeal surgery.

The relationship between structural/MHC changes in upper airway palatopharyngeal muscle morphology and obstructive sleep apnea/hypopnea syndrome.

The aim of this study is to explore the relationship between structural/MHC changes in upper airway palatopharyngeal muscle morphology and obstructive sleep apnea/hypopnea syndrome. Palatopharyngeal muscle specimens were taken from 51 patients with obstructive sleep apnea hypopnea syndrome (OSAHS) who underwent uvulopalatopharyngoplasty (UPPP) resection. Patients were divided into light, medium and severe in terms of the severity of their OSAHS. There were 17 patients in each severity group. Palatopharyngeal muscle specimens were also taken from 17 patients suffering from chronic tonsillitis for comparison as the control group. All specimens were stained using Masson and observed for structural changes, especially in muscle fiber morphology, density and arrangement, as well as intermuscular connective tissues, under light microscopy. All specimens were also analyzed for MHC-I, MHC-IIa and MHC-IIb phenotype and protein expression differences using mRNA quantitative reverse transcription polymerase chain reaction (RT-PCR) and immunofluorescence staining. The results from each group were then statistically analyzed using semi-quantitative analysis. Light microscopy with Masson staining revealed that in the control group, the muscle fibers are closely connected and arranged neatly. In specimens from patients suffering from OSAHS, the palatopharyngeal muscle fibers are larger with obvious hypertrophy and there was an increase in elastic fibers. The mucosal lamina propria was thickened, and the density of muscle fibers was reduced. Muscle fibers are not neatly arranged and degeneration was observed. The amount of muscular pathology and fibrosis corresponds to the severity of disease in the patients. In patients with severe OSAHS, the proportion of collagen to muscle fibers was increased significantly. Immunofluorescence results reveal that there were significantly more fast muscle fibers and less slow muscle fibers in the study group than the control group. mRNA quantitative reverse transcription polymerase chain reaction (RT-PCR) revealed similar results, i.e., the proportion of MHC-II palatopharyngeal muscle fibers is higher in the study group than the control group, and increases with the severity of OSAHS. Pathological change occurs in both the collagen and muscle of OSAHS patients and corresponds to the degree of severity of OSAHS. Pathological change in palatopharyngeal muscle tissues is therefore, likely to be related to the occurrence and development of OSAHS. The increase in the proportion of the MHC-1I type fibers in OSAHS patients is likely to have an effect on the amount of airway support conferred by the muscle. This is likely the reason behind the lack of clinical improvement in some patients with severe OSAHS despite surgical treatment.

Pharyngeal airway characterization in adolescents related to facial skeletal pattern: a preliminary study.

INTRODUCTION: The objective of this study was to characterize the volume and the morphology of the pharyngeal airway in adolescent subjects, relating them to their facial skeletal pattern. METHODS: Fifty-four subjects who had cone-beam computed tomography were divided into 3 groups-skeletal Class I, Class II, and Class III-according to their ANB angles. The volumes of the upper pharyngeal portion and nasopharynx, and the volume and morphology of the lower pharyngeal portion and its subdivisions (velopharynx, oropharynx, and hypopharynx) were assessed with software (version 11.5; Dolphin Imaging & Management Solutions, Chatsworth, Calif). The results were compared with the Kruskal-Wallis and the Dunn multiple comparison tests to identify intergroup differences. Correlations between variables assessed were tested by the Spearman correlation coefficient. Correlations between the logarithms of airway volumes and the ANB angle values were tested as continuous variables with linear regression, considering the sexes as subgroups. RESULTS: The minimum areas in the Class II group (112.9 ± 42.9, 126.9 ± 45.9, and 142.1 ± 83.5 mm(2)) were significantly smaller than in Class III group (186.62 ± 83.2, 234.5 ± 104.9, and 231.1 ± 111.4 mm(2)) for the lower pharyngeal portion, the velopharynx, and the oropharynx, respectively, and significantly smaller than the Class I group for the velopharynx (201.8 ± 94.7 mm(2)). The Class II group had a statistically significant different morphology than did the Class I and Class III groups in the velopharynx. There was a tendency to decreased airway volume with increased ANB angle in the lower pharyngeal portion, velopharynx, and oropharynx. In the upper pharyngeal portion, nasopharynx, and hypopharynx, there seemed to be no association between the airway volume and the skeletal pattern. CONCLUSIONS: The Class II subjects had smaller minimum and mean areas (lower pharyngeal portion, velopharynx, and oropharynx) than did the Class III group and significantly less uniform velopharynx morphology than did the Class I and Class III groups. A negative correlation was observed between the ANB value and airway volume in the lower pharyngeal portion and the velopharynx (both sexes) and in the oropharynx (just in male subjects).

Towards clinical assessment of velopharyngeal closure using MRI: evaluation of real-time MRI sequences at 1.5 and 3 T.

OBJECTIVE: The objective of this study was to demonstrate soft palate MRI at 1.5 and 3 T with high temporal resolution on clinical scanners. METHODS: Six volunteers were imaged while speaking, using both four real-time steady-state free-precession (SSFP) sequences at 3 T and four balanced SSFP (bSSFP) at 1.5 T. Temporal resolution was 9-20 frames s(-1) (fps), spatial resolution 1.6 × 1.6 × 10.0-2.7 × 2.7 × 10.0 mm(3). Simultaneous audio was recorded. Signal-to-noise ratio (SNR), palate thickness and image quality score (1-4, non-diagnostic-excellent) were evaluated. RESULTS: SNR was higher at 3 T than 1.5 T in the relaxed palate (nasal breathing position) and reduced in the elevated palate at 3 T, but not 1.5 T. Image quality was not significantly different between field strengths or sequences (p=NS). At 3 T, 40% acquisitions scored 2 and 56% scored 3. Most 1.5 T acquisitions scored 1 (19%) or 4 (46%). Image quality was more dependent on subject or field than sequence. SNR in static images was highest with 1.9 × 1.9 × 10.0 mm(3) resolution (10 fps) and measured palate thickness was similar (p=NS) to that at the highest resolution (1.6 × 1.6 × 10.0 mm(3)). SNR in intensity-time plots through the soft palate was highest with 2.7 × 2.7 × 10.0 mm(3) resolution (20 fps). CONCLUSIONS: At 3 T, SSFP images are of a reliable quality, but 1.5 T bSSFP images are often better. For geometric measurements, temporal should be traded for spatial resolution (1.9 × 1.9 × 10.0 mm(3), 10 fps). For assessment of motion, temporal should be prioritised over spatial resolution (2.7 × 2.7 × 10.0 mm(3), 20 fps). Advances in knowledge Diagnostic quality real-time soft palate MRI is possible using clinical scanners and optimised protocols have been developed. 3 T SSFP imaging is reliable, but 1.5 T bSSFP often produces better images.

Anatomy and physiology of the velopharyngeal mechanism.

Understanding the normal anatomy and physiology of the velopharyngeal mechanism is the first step in providing appropriate diagnosis and treatment for children born with cleft lip and palate. The velopharyngeal mechanism consists of a muscular valve that extends from the posterior surface of the hard palate (roof of mouth) to the posterior pharyngeal wall and includes the velum (soft palate), lateral pharyngeal walls (sides of the throat), and the posterior pharyngeal wall (back wall of the throat). The function of the velopharyngeal mechanism is to create a tight seal between the velum and pharyngeal walls to separate the oral and nasal cavities for various purposes, including speech. Velopharyngeal closure is accomplished through the contraction of several velopharyngeal muscles including the levator veli palatini, musculus uvulae, superior pharyngeal constrictor, palatopharyngeus, palatoglossus, and salpingopharyngeus. The tensor veli palatini is thought to be responsible for eustachian tube function.

Anterior maxillary segmental distraction for correction of maxillary hypoplasia and dental crowding in cleft palate patients: a preliminary report.

To evaluate the feasibility of anterior maxillary segmental distraction (AMSD) to correct maxillary hypoplasia and severe dental crowding in cleft lip and palate (CLP) patients, 7 patients (average age 16.4 years) with maxillary hypoplasia, shortened maxillary dental arch length and severe anterior dental crowding secondary to CLP were selected for this study. After anterior maxillary segmental osteotomy, 3 patients were treated using bilateral internal distraction devices, and 4 patients were treated using rigid external distraction devices. Photographs and radiographs were taken to review the improvement in facial profile and occlusion after distraction. An average 10.25 mm anterior maxillary advancement was obtained in all patients after 10-23 days of distraction and 9-16 weeks of consolidation. The sella-nasion-point A (SNA) angle increased from 69.5 degrees to 79.6 degrees. Midface convexity was greatly improved and velopharyngeal competence was preserved. The maxillary dental arch length was greatly increased by 10.1 mm (P<0.01). Dental crowding and malocclusion were corrected by orthodontic treatment. These results show that AMSD can effectively correct the hypoplastic maxilla and severe dental crowding associated with CLP by increasing the midface convexity and dental arch length while preserving velopharyngeal function, and dental crowding can be corrected without requiring tooth extraction.

Structural and functional causes of hypernasality in velocardiofacial syndrome. A pilot study.

OBJECTIVE: Hypernasality in velocardiofacial syndrome (VCFS) is more severe, persistent, and difficult to manage compared to other populations with cleft palate or velopharyngeal (VP) dysfunction. This pilot study investigated why children with VCFS have more severe hypernasality. METHODS: Pressure-flow methodology indirectly measured VP orifice size and VP closure timing during speech in a group of 5 children with VCFS, 5 children with cleft palate, and 6 normal children. RESULTS: Children with VCFS demonstrated significant differences in VP closure timing and hypernasality. There were no significant group differences in VP orifice size. Duration of nasal airflow was the strongest predictor of judgments of hypernasality. CONCLUSION: This study provides preliminary evidence that VP closure timing may account for the more severe hypernasality in children with VCFS, compared to structural factors alone.