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Hypernasal speech

hypernasal speech, hypernasal speech after adenoidectomy
Hypernasal speech also hyperrhinolalia or open nasality; medically known as Rhinolalia aperta from Latin rhinolalia: "nasal speech" and aperta: "open" is a disorder that causes abnormal resonance in a human's voice due to increased airflow through the nose during speech It is caused by an open nasal cavity resulting from an incomplete closure of the soft palate and/or velopharyngeal sphinctercitation needed In normal speech, nasality is referred to as nasalization and is a linguistic category that can apply to vowels or consonants in a specific language The primary underlying physical variable determining the degree of nasality in normal speech is the opening and closing of a velopharyngeal passageway between the oral vocal tract and the nasal vocal tract In the normal vocal tract anatomy, this opening is controlled by lowering and raising the velum or soft palate, to open or close, respectively, the velopharyngeal passageway

Contents

  • 1 Anatomy
  • 2 Causes
  • 3 Diagnosis
    • 31 Effects on language
  • 4 Treatment
    • 41 Speech therapy
      • 411 Exercises
    • 42 Surgery
      • 421 Posterior pharyngeal flap
      • 422 Sphincter pharyngoplasty
      • 423 Complications
  • 5 See also
  • 6 References

Anatomyedit

Nasal and oral cavities with the velopharyngeal sphincter highlighted in blue

The palate comprises two parts, the hard palate palatum durum and the soft palate palatum molle, which is connected to the uvula The movements of the soft palate and the uvula are made possible by the velopharyngeal sphincterclarification needed During speech or swallowing, the uvula lifts against the back throat wall to close the nasal cavity When producing nasal consonants such as "m", "n", and "ng", the uvula remains relaxed, thereby enabling the air to go through the nose

The Eustachian tube, which opens near the velopharyngeal sphincter, connects the middle ear and nasal pharynx Normally, the tube ensures aeration and drainage of secretions of the middle ear Narrow and closed at rest, it opens during swallowing and yawning, controlled by the tensor veli palatini and the levator veli palatini muscles of the soft palate Children with a cleft palate have difficulties controlling these muscles and thus are unable to open the Eustachian tube Secretions accumulate in the middle ear when the tube remains dysfunctional over a long period of time, which cause hearing loss and middle ear infections Ultimately, hearing loss can lead to impaired speech and language development12

Causesedit

Incomplete cleft palate

The general term for disorders of the velopharyngeal valve is velopharyngeal dysfunction VPD It includes three subterms: velopharyngeal insufficiency, velopharyngeal inadequacy, and velopharyngeal mislearning

  • Velopharyngeal insufficiency can be caused by an anatomical abnormality of the throat It occurs in children with a history of cleft palate or submucous cleft, who have short or otherwise abnormal vela Velopharyngeal insufficiency can also occur after adenoidectomy
  • Velopharyngeal incompetence is a defective closure of the velopharyngeal valve due to its lack of speed and precision It is caused by a neurologic disorder or injury eg cerebral palsy or traumatic brain injury
  • Sometimes children present no abnormalities yet still have hypernasal speech: this can be due to velopharyngeal mislearning, indicating that the child has been imitatingclarification needed or has never learned how to use the valve correctly34

Diagnosisedit

There are several methods for diagnosing hypernasality

  • A speech therapist listens to and records the child while analysing perceptual speech5 In hypernasality, the child cannot produce oral sounds vowels and consonants correctly Only the nasal sounds can be correctly produced6 A hearing test is also desirable7
  • A mirror is held beneath the nose while the child pronounces the vowels Nasal air escape, and thus hypernasality, is indicated if the mirror fogs up
  • A pressure-flow technique is used to measure velopharyngeal orifice area during the speech The patient must be at least three to four years old
  • A video nasopharyngeal endoscopy observes velopharyngeal function, movements of the soft palate, and pharyngeal walls It utilises a very small scope placed in the back of the nasal cavity The doctor will then ask the child to say a few words The patient must be at least three to four years old to ensure cooperation
  • A cinefluoroscopy gives dynamic visualisation and can easier be applied to younger children, though it has the disadvantage of exposing the patient to radiation8
  • A nasometer calculates the ratio of nasality The patient wears a headset, where the oral and nasal cavities are separated by a plateclarification needed On both sides of the plate are microphones The ratio calculated by the nasometer indicates the amount of nasality, with a higher ratio indicating more nasality9

Effects on languageedit

Hypernasality is generally segmented into so-called 'resonance' effects in vowels and some voiced or sonorant consonants and the effects of excess nasal airflow during those consonants requiring a buildup of oral air pressure, such as stop consonants as /p/ or sibilants as /s/ The latter nasal airflow problem is termed 'nasal emission',10 and acts to prevent the buildup of air pressure and thus prevent the normal production of the consonant In testing for resonance effects without the aid of technology, speech pathologists are asked to rate the speech by listening to a recorded sentence or paragraph, though there is much variability in such subjective ratings, for at least two reasons First, the acoustic effect of a given velopharyngeal opening varies greatly depending on the degree of occlusion of the nasal passageways This is the reason why a stuffy nose from an allergy or cold will sound more nasal than when the nose is clear Secondly, for many persons with hypernasal speech, especially hearing impaired, there are also mispronunciations of the articulation of the vowels It is extremely difficult to separate the acoustic effects of hypernasality from the acoustic effects of mispronounced vowels examples Of course, in speech training of the hearing impaired, there is little possibility of making nasality judgments aurally, and holding a finger to the side of the nose, to feel voice frequency vibration, is sometimes recommended11

Treatmentedit

Speech therapyedit

In cases of muscle weakness or cleft palate, special exercises can help to strengthen the soft palate muscles with the ultimate aim of decreasing airflow through the nose and thereby increasing intelligibility Intelligibility requires the ability to close the nasal cavity, as all English sounds, except "m", "n", and "ng", have airflow only through the mouth Normally, by age three, a child can raise the muscles of the soft palate to close to nasal cavity

Without the use of a technological aid, nasal emission is sometimes judged by listening for any turbulence that may be produced by the nasal airflow, as when there is a small velopharyngeal opening and there is some degree of mucous in the opening More directly, methods recommended include looking for the fogging of a mirror held near the nares or listening through a tube, the other end of which is held in or near a nares opening11

There have been many attempts to use technological augmentation more than a mirror or tube to aid the speech pathologist or provide meaningful feedback to the person attempting to correct their hypernasality Among the more successful of these attempts, the incompleteness of velopharyngeal closure during vowels and sonorants that causes nasal resonance can be estimated and displayed for evaluation or biofeedback in speech training through the nasalance of the voice, with nasalance defined as a ratio of acoustic energy at the nostrils to that at the mouth, with some form of acoustic separation present between the mouth and nose In the nasalance measurement system sold by WEVOSYS, the acoustic separation is provided by a mask-tube system, nasalance measurement system sold by Kay-Pentax, the acoustic separation is provided by a solid flat partition held against the upper lip, while in the system sold by Glottal Enterprises the acoustic separation can be by either a solid flat partition or a two-chamber mask1012

However, devices for measuring nasalance do not measure nasal emission during pressure consonants Because of this, a means for measuring the degree of velopharyngeal closure in consonants is also needed A commercially available device for making such measurements is the Perci-Sar system from Microtronics The Nasality Visualization System from Glottal Enterprises allows both the measurement of Nasal Emission and Nasalance In the presence of a cleft palate, either of these systems can be helpful in evaluating the need for an appliance or surgical intervention to close the cleft or the success of an appliance or a surgical attempt to close the cleft

Exercisesedit

If a child finds it difficult to blow, pinching the nose can help regulate airflow The child should then practice speech sounds without pinching the nose These exercises only work as treatments if hypernasality is small Severe deviations should be treated surgically13

Surgeryedit

The two main surgical techniques for correcting the aberrations the soft palate present in hypernasality are the posterior pharyngeal flap and the sphincter pharyngoplasty After surgical interventions, speech therapy is necessary to learn how to control the newly constructed flaps14

Posterior pharyngeal flapedit

See also: Pharyngeal flap surgery

Posterior pharyngeal flap surgery is mostly used for vertical clefts of the soft palate The surgeon cuts through the upper layers of the back of the throat, creating a small square of tissue This flap remains attached on one side usually at the top The other side is attached to parts of the soft palate This ensures that the nasal cavity is partially separated from the oral cavity When the child speaks, the remaining openings close from the side due to the narrowing of the throat caused by the muscle movements necessary for speech In a relaxed state, the openings allow breathing through the nose14

Sphincter pharyngoplastyedit

Sphincter pharyngoplasty is mostly used for horizontal clefts of the soft palate Two small flaps are made on the left and right side of the entrance to the nasal cavity, attached to the back of the throat For good results, the patient must have good palatal motion, as the occlusion of the nasal cavity is mainly carried out by muscles already existing and functioning14

Snoring
Sound sample of snoring
Classification and external resources
ICD-10 R065
ICD-9-CM 78609
DiseasesDB 12260
MeSH D012913
edit on Wikidata

Complicationsedit

The most common complications of the posterior pharyngeal wall flap are hyponasality, nasal obstruction, snoring, and sleep apnea Rarer complications include flap separation, sinusitis, postoperative bleeding, and aspiration pneumonia Possible complications of the sphincter pharyngoplasty are snoring, nasal obstruction, difficulty blowing the nose

Some researches suggest that sphincter pharyngoplasty introduces less hyponasality and obstructive sleep symptoms than the posterior pharyngeal wall flap Both surgeries have a favourable effect on the function of the Eustachian tube4 151416

See alsoedit

  • Rhinolalia clausa
  • Nasalization
  • Nasalance

Referencesedit

  1. ^ "Specifieke informatie over schisis per type schisis" Specific information on each type of cleft lip and palate cleft in Dutch Nederlandse Vereniging voor Schisis en Craniofaciale Afwijkingen 2012 Retrieved 20 May 2012 
  2. ^ Stegenga, B; Vissink, A; Bont, LGM de 2000 Mondziekten en kaakchirurgie Oral and Maxillofacial Surgery in Dutch Assen: Van Gorcum p 388 ISBN 9789023235002 
  3. ^ Kummer, Ann W "Speech Therapy for Cleft Palate or Velopharyngeal Dysfunction VPD" PDF Cincinnati Children's Hospital Medical Center Archived from the original PDF on 2012-04-05 
  4. ^ a b Biavati, Michael J; Sie, Kathleen; Wiet, Gregory J 2 September 2011 "Velopharyngeal Insufficiency" Medscape Reference WebMD LLC 
  5. ^ Morgan Stanley Children's Hospital "Otolaryngology Ear, Nose and Throat" Columbia University Medical Center 
  6. ^ Gelder, van J 1957 "De open neusspraak, pathogenese en diagnostiek" Nederlands Tijdschrift voor Geneeskunde Netherlands Journal of Medicine in Dutch 101: 1005–10 
  7. ^ Department of Otolarynology/Head and Neck Surgery "Hypernasality – Velopharyngeal Insufficiency" Columbia University Medical Center Archived from the original on 2012-04-03 
  8. ^ Probst, Rudolf; Grevers, Gerhard; Iro, Heinrich; Telger, Terry translator; Baum, Karin illustrator 2006 Basic Otorhinolaryngology a step-by-step learning guide revised ed Stuttgart: Thieme p 401 ISBN 9783131324412 
  9. ^ KayPENTAX "Nasometer II, Model 6450" PENTAX Medical Company 
  10. ^ a b RJ Baken, Robert F Orlikoff Clinical Measurement of Speech and Voice San Diego: Singular, 2000
  11. ^ a b Kummer, A W Resonance disorders and nasal emission: Evaluation and treatment using "low tech" and "no tech" procedures The ASHA Leader 2006 Feb 7 112, pp 4, 26
  12. ^ Watterson T, Lewis K, Brancamp T "Comparison of Nasalance scores obtained with the Nasometer 6200 and the Nasometer II 6400" Cleft Palate Craniofac J 2005 Sep;425:574-9 PMID 16149843
  13. ^ "Spraak en taal" Speech and Language in Dutch Nederlandse Vereniging voor Schisis en Craniofaciale Afwijkingen 
  14. ^ a b c d de Serres, Lianne M; Deleyiannis, Frederic W-B; Eblen, Linda E; Gruss, Joseph S; Richardson, Mark A; Sie, Kathleen CY April 1999 "Results with sphincter pharyngoplasty and pharyngeal flap" International Journal of Pediatric Otorhinolaryngology 48 1: 17–25 doi:101016/S0165-58769900006-3 
  15. ^ Sloan, GM February 2000 "Posterior pharyngeal flap and sphincter pharyngoplasty: the state of the art" The Cleft Palate-Craniofacial Journal 37 2: 112–22 PMID 10749049 doi:101597/1545-15692000037<0112:PPFASP>23CO;2 
  16. ^ Spawen, PHM; Huffstadt, AJC; Schutte, HK; Ritsma, RJ 1987 "De invloed van chirurgische behandeling van open neusspraak op horen en spreken" Nederlands Tijdschrift voor Geneeskunde Netherlands Journal of Medicine in Dutch 131: 161–6 Archived from the original on 2014-02-22 

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    29.10.2014


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