Reflexo da deglutição: análise sobre eficiência de diferentes estímulos em jovens sadios / Swallowing reflex: analysis of the efficiency of different stimuli on healthy young individuals

TEMA: a ausência ou atraso do reflexo da deglutição é considerado um sinal significativo de disfagia. Assim, a terapia tradicionalmente empregada nesses casos consiste em aumentar o input intra-oral por meio de toques gelados (espelho laríngeo 0 ou 00) no terço inferior do arco palatoglosso, porção inferior. OBJETIVOS: identificar, em indivíduos jovens e sadios, quais regiões da orofaringe são mais sensíveis para desencadear o reflexo da deglutição e qual estímulo é mais eficiente. MÉTODO: O reflexo da deglutição foi investigado a partir dos estímulos: espátula, espelho laríngeo 00 gelado, espátula envolta em gaze com água gelada e espátula envolta em gaze umedecida congelada, tocando-se o arco palatoglosso em suas porções inferior e superior, as tonsilas palatinas, a base de língua e a úvula em 65 indivíduos jovens e sadios. RESULTADOS: o reflexo da deglutição não foi desencadeado na maioria dos participantes quando tocado com diferentes estímulos e locais da orofaringe, sendo esta estatisticamente significante. Quando presente, os estímulos mais eficientes foram o espelho laríngeo 00 (28,6 por cento) e a espátula envolta com gaze congelada (27,3 por cento). Quanto à região da orofaringe, a úvula (29,6 por cento), as tonsilas palatinas (26,7 por cento), os arcos palatoglossos região superior (25 por cento) e inferior (21,2 por cento) e base de língua (25 por cento) foram sensíveis aos estímulos. CONCLUSÃO: quando presente o reflexo da deglutição, a úvula, os arcos palatoglossos e as tonsilas palatinas foram as regiões mais sensíveis para desencadeá-lo e o estímulo mais eficiente, dentre os selecionados, foram o espelho laríngeo gelado e a espátula envolta em gaze umedecida congelada.

BACKGROUND: the absence or delay of the swallowing reflex is considered a significant sign of dysphagia. Therefore, the therapy traditionally applied to these cases consists in increasing the intra-oral input through cold touches (0 or 00 larynx mirror) on the inferior portion of the inferior third of the palatoglossus arch. AIM: to identify in healthy young individuals which oropharyngeal regions are more sensitive and which stimulus is more efficient in triggering the swallowing reflex. METHODS: the swallowing reflex was analyzed based on the following stimuli: spatula, cold 00 larynx mirror, gauze embedded in cold water wrapped onto spatula and frozen moist gauze wrapped onto spatula; touching the palatoglossus arch in both its inferior and superior portions, the palatine tonsils, the base of the tongue and the uvula in 65 healthy young individuals. RESULTS: the swallowing reflex was not triggered in most of the participants when touching different oropharyngeal regions with different stimuli. This result was statistically significant. When present, the most efficient stimuli were cold 00 larynx mirror (28.6 percent) and frozen moist gauze wrapped onto spatula (27.3 percent). Concerning the oropharynx, the uvula (29.6 percent), the palatine tonsils (26.7 percent), the superior (25 percent) and inferior (21.2 percent) palatoglossi arches and the base of tongue (25 percent) were most sensitive to the applied stimuli. CONCLUSION: when the swallowing reflex was present, the uvula, the palatoglossi arches and the palatine tonsils were the most sensitive regions to trigger this reflex, and the most efficient stimuli to trigger swallowing were the cold 00 larynx mirror and the frozen moist gauze wrapped onto spatula.

A comparison of postoperative recovery from laser-assisted uvulopalatoplasty using different laser systems.

OBJECTIVES: The aim of this study was to compare the effectiveness of 5 power lasers (CO(2), diode, KTP, ErCr:YS66, and ND:YVO4) in laser-assisted uvulopalatoplasty. METHODS: This is a prospective study of 100 patients who were treated for snoring by laser-assisted uvulopalatoplasty with different lasers. RESULTS: The number of days of pain medication use and the time to return to normal diet were used as indicators of recovery from surgery. Median of pain medication use was 9, 7, 7, 5, and 4 days, and the median of the time to return to normal diet was 8, 7, 7, 6, and 4 days in the CO(2), diode, KTP, Nd:YVO4, and ErCrYSGG groups, respectively. CONCLUSIONS: Differences in postoperative recovery were observed. Probands treated with ErCrYSGG laser recovered more quickly than the Nd:YVO4, diode, KTP, and CO(2) groups.

Why do we have a uvula?: literature review and a new theory.

From ancient times up to the present day many different functions and conditions have been attributed to the uvula, many speculative and some with a more scientific basis. The uvula has been shown to have the ability to produce and secrete large quantities of thin saliva. A common complication of surgery involving removal of the uvula is pharyngeal dryness. We have observed that on phonation and swallowing the uvula swings back and forth in the oropharynx. We present a review of the literature on the uvula and propose a theory that the uvula bastes the throat and thereby helps keep it moist and well lubricated.

Palatal snoring identified by acoustic crest factor analysis.

The differentiation of palatal from non-palatal snoring is very important for ENT surgeons trying to determine whether palatal surgery would be curative. At present sleep nasendoscopy is the accepted method. Palatal vibration produces marked modulation of sound loudness at low frequency (below approximately 100 Hz). We calculate a crest factor for the sound waveform (ratio of peak to root mean square (rms) value in any given epoch), as a measure of the degree of modulation. Free-field snore sounds were recorded from 11 supine adult patients under intravenous sedation (midazolam), using a digital tape recorder. Recordings were transferred to a PC (sampling frequency 11 kHz), and analysed using code written by us. Direct visual confirmation of the site of snoring was gained from simultaneous sleep nasendoscopy, taken as the gold standard. In six patients the dominant site was the soft palate. The non-palatal group (five patients) comprised one epiglottic, two hypopharyngeal and two tongue base snorers. The crest factor was found to be significantly higher for palatal snorers (p < 0.01, Student-t or Mann-Whitney tests). Furthermore, palatal could be distinguished from non-palatal snorers on the basis of crest factor alone in all 11 cases, making this a promising non-invasive diagnostic technique.

Musculus uvulae and levator palati: their anatomical and functional relationship in velopharyngeal closure.

The morphological relationship between the musculus uvulae and levator palati muscles and their importance in velopharyngeal closure was studied in cadavers by simulation of levator action, palate serial section and dissection, and in various subjects by nerve stimulation and blockade. These studies support the cardinal importance of the levator muscles in velopharyngeal closure. The significance of musculus uvulae activity is less clear. While lesser palatine nerve stimulation evoked a response from the musculus uvulae, a nerve block produced no detrimental effect on speech or nasendoscopic appearance in normal subjects.

What muscle is responsible for lateral pharyngeal wall movement?

In an attempt to discover what muscle is responsible for medial movement of the lateral pharyngeal wall, the levator muscle was anesthetized with lidocaine under visual control by fiberscope in 3 normal subjects. The results indicate that the medial movement of the lateral pharyngeal wall results from the contraction of the levator. The attendant roll-up of the uvula toward the nasal side induced by the anesthesia was regarded as the action of the uvular muscle without the counterbalance of levator action.

Velopharyngeal insufficiency due to hypoplasia of the musculus uvulae and occult submucous cleft palate.

With the help of nasopharyngoscopy, it was possible to delineate specific morphologic changes in the palates of patients with velopharyngeal insufficiency, without an overt cleft and without the triad of symptoms of submucous cleft palate, visible through the oral cavity. Such malformations are part of the broad spectrum of the faulty midline mesodermal fusion of the palate. This anomaly is aptly called occult submucous cleft palate, because it can only be detected by viewing the functioning palate from the nasal surface. The musculus uvulae is either absent or deficient and is frequently associated with some degree of muscular diastasis that does not involve the oral surface. Like the cleft of the secondary palate, the submucous cleft palate often occurs as part of a generalized syndrome of multiple malformations.