Resonance Disorders and Velopharyngeal Dysfunction · PDF fileResonance Disorders and...
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Resonance Disorders and Velopharyngeal Dysfunction:
Evaluation and Treatment
Ann W. Kummer, PhD, CCC-SLP
Cincinnati Children’s
Hospital Medical Center
Financial Disclosures• Employment:
– Cincinnati Children’s Hospital Medical Center
• Royalties
– Author of the text called Cleft Palate and Craniofacial
Anomalies: The Effects on Speech and Resonance,
Delmar Cengage, 2008.
– Developer of Oral and Nasal Listener (ONL), Super
Duper Publications
• Honoraria
– Seminars at state conferences and other events
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Non-Financial Disclosure
• Author of the SNAP test for nasometry
• Serve on committees for the American Cleft Palate-Craniofacial Association
• Serve on various advisory boards
Seminar Outline
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Resonance Disorders andVelopharyngeal Dysfunction
• Normal resonance
• Resonance disorders
• Normal velopharyngeal function
• Velopharyngeal dysfunction (VPD)
o Velopharyngeal insufficiency (VPI)
o Velopharyngeal incompetence (VPI)
o Velopharyngeal mislearning
o Effects of CLP/VPI on speech and resonance
Evaluation and Treatment
• Evaluationo Perceptual evaluation
o Intra-oral evaluation
o Instrumental evaluation
• Treatment of VPIo Surgical procedures
o Prosthetic devices
• Speech therapy• Referrals
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Normal Resonance
What is resonance for speech?
• Modification of the sound that is generated from the vocal cords thru selective enhancement of frequencies
• Provides the quality of perceived sound during speech
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What determines resonance
for speech?
• Size and shape of the resonating cavities
• pharyngeal cavity
• oral cavity
• nasal cavity
• Function of the velopharyngeal valve
Size and Shape of Cavities
• Shorter/smaller cavities: enhance higher formants
• Longer/larger cavities: enhance lower formants
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Size and Shape of Cavities
Resonance is affected by the following:
• Length and volume of pharynx
• Size and shape of oral cavity
• Configuration of nasal cavity
Size and Shape of Cavities
• Differences between
– children and adults
– men and women
– tall people and short people
• Makes voice quality unique to individual
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Resonance and Vowels
• Vowels are “resonance sounds”
• They are produced by changing the size and shape of the oral (resonating) cavity
Resonance Disorders
• Hypernasality
• Hyponasality (denasality)
• Cul de sac resonance
• Mixed resonance
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Hypernasality
• Too much sound resonating in the nasal cavity
• Usually due to VPI or fistula
• Most perceptible on vowels
Hypernasality
• Voiced oral consonants become nasalized (m/b, n/d, etc.)– Obligatory distortion
• Other consonants may be substituted by nasals – Compensatory production
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Hyponasality
• Not enough nasal resonance on nasal sounds (m, n, ng)
• Due to nasal obstruction
• Nasal phonemes sound similar to oral cognates (b/m, d/n, g/ng)
• Also noticeable on vowels
Cul de Sac Resonance
• Sound resonates in a cavity (oral, pharyngeal or nasal), but cannot get out
• Due to blockage in the vocal tract
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Cul de Sac Resonance
• Voice sounds muffled and low in volume
• Sound is absorbed (like a sponge) in the cavity
Cul de Sac ResonanceTypes and Causes
• Oral cul de sac resonance
• Nasal cul de sac resonance
• Pharyngeal cul de sac resonance
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Oral Cul de Sac Resonance
• Sound is mostly in the oral cavity
• Due to small oral cavity size or small mouth opening (microstomia)
• Parents describe speech as “mumbling” (which is not opening the mouth very much)
Nasal Cul de Sac Resonance
• Sound is mostly in the nasal cavity
• Due to VPI and nasal obstruction from:
– a deviated septum
– stenotic nares
– maxillary retrusion
• Common with cleft palate and craniofacial anomalies
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Pharyngeal Cul de Sac Resonance
• Sound is mostly in the pharynx
• Common in patients with very large tonsils
Pharyngeal Cul de Sac Resonance
• Has been called “potato-in-the-mouth” speech
• Enlarged tonsils are the “potatoes”
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Pharyngeal Cul de Sac Resonance
• Enlarged tonsils block sound transmission to oral cavity
Mixed Resonance
• Hypernasality and/or nasal emission on oral sounds and hyponasality on nasal sounds
• Due to:
– VPI and obstruction
– Apraxia
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Normal Velopharyngeal Function
Structures Active in VP Closure
• Velum (Soft Palate)
• Lateral Pharyngeal Walls (LPWs)
• Posterior Pharyngeal Wall (PPW)
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Velum: Rest
Velum (Soft Palate)
• Moves in a superior and posterior direction
• Has a type of “knee” action
• Moves toward the posterior pharyngeal wall
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Velum: During Speech
Physics and Flow
• Water (and air) flow in a forward direction until something stops it
• An obstructing object will redirect the flow
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Velopharyngeal Valve and Flow
• Due to the physics of airflow, even a small opening will be symptomatic for speech.
Lateral Pharyngeal Walls (LPWs)
• Move medially to close against the velum or in some cases, behind the velum
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Posterior Pharyngeal Wall (PPW)
• Has slight anterior movement toward the velum
• In some speakers, there’s a bulge called a Passavant’s ridge (formed by muscle contraction)
Passavant’s Ridge
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VP Valve during Speech
• Velopharyngeal valve is closed for oral sounds
– Most consonants (air pressure sounds)
– All vowels (resonance sounds)
• Velopharyngeal valve is open for nasal sounds (m, n, ng)
Purpose of VP Valve
• Directs transmission of sound energy and air flow in the oral and nasal cavities during speech
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Muscles of VP Closure
• Levator veli palatini (velar “sling”)
• Superior constrictor (pharyngeal ring)
• Palatopharyngeus (post. faucial pillar)
• Palatoglossus (ant. faucial pillar)
• Musculus uvulae (bulge on nasal surface)
Muscles of VP Closure
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Motor Nerves of VP Function
• Glossopharyngeal (IX)
• Vagus (X)
• Accessory (XI)
• Trigeminal (V)
• Facial (VII)
Sensory Nerves of Velum
• Vagus (X)
• Glossopharyngeal (IX)
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Normal VP Closure
(Nasopharyngoscopy)
Variations in VP Closure
• Coronal Pattern – Due mostly to velar movement
• Sagittal Pattern– Due mostly to LPW movement
• Circular Pattern (with and without
Passavant’s ridge)
– All structures move and close like a purse string
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Patterns of Closure
Variations in VP Closure
• Non-Pneumatic:
– gagging, vomiting, swallowing
• Pneumatic:
– Positive (+) pressure: blowing, whistling, speech
– Negative (-) pressure: sucking, kissing
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Normal Velopharyngeal Function
Learning (Articulation)
Physiology (Movement)Anatomy (Structure)
Velopharyngeal Dysfunction
Articulation/Speech Learning
(Velopharyngeal Mislearning)
Physiology
(Velopharyngeal Incompetence)
Anatomy
(Velopharyngeal Insufficiency)
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VPI: Velopharyngeal Insufficiency and Incompetence
• Velopharyngeal insufficiency- abnormal structure
• Velopharyngeal incompetence- abnormal neurophysiology
Velopharyngeal Insufficiency
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VP Insufficiency
• History of cleft palate
• Submucous cleft palate (overt or occult)
• Short velum or deep pharynx (cranial base anomalies)
• Irregular adenoids
• Enlarged tonsils
History of Cleft Palate
• Velum may be too short following repair
• Velum may have a notch on posterior nasal surface
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Submucous Cleft PalateNasal Surface
Deep Pharynx
• Can be due to cranial base or cervical spine anomalies (i.e., Klippel-Feil syndrome or craniosynostosis)
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Adenoids
• Positioned in usual site of VP contact
• Closure is velo-adenoidal in kids
• Normal VP closure requires a tight seal
• Adenoid protrusion or indentation can affect closure
Irregular Adenoids
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Enlarged Tonsils
• Can extend into pharynx, interfering with LPW and velar movement or preventing a tight VP seal
Nasopharyngoscopy of Tonsil
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VP Insufficiency Following Surgery or Treatment
• Adenoidectomy
• Maxillary advancement
• Treatment of nasopharyngeal tumors
Adenoidectomy
• Sudden increase in the nasopharyngeal dimension can cause VPI
• Often temporary and resolves within 6 weeks
• Permanent VPI is a risk, especially with history of cleft or submucous cleft
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VPI Post Adenoidectomy
• Caused by a change in the structure
• Speech therapy CANNOT change structure
• Exercises don’t work because the problem is not the muscles
• VPI post-adenoidectomy requires surgical intervention by a surgeon who specializes in clefts and VPI
Le Fort I Maxillary Advancement
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Maxillary Advancement
• Done surgically or through distraction
• Corrects Class III malocclusion and midface retrusion
• Improves aesthetics and articulation (obligatory distortions)
• Often done for patients with history of cleft
Pre Maxillary Advancement
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Post Maxillary Advancement
Post Maxillary Advancement
• Moving maxilla forward also moves velum forward
• Velum may stretch and lengthen; LPW movement may increase
• VPI is a risk, especially in patients with history of cleft or submucous cleft
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Treatment for Oral Cavity of
Nasopharyngeal Tumors
• Radiation therapy shrinks abnormal and surrounding normal tissue
• Ablative surgery removes tissue
• Both increase nasopharyngeal space, making closure more difficult
Velopharyngeal Incompetence
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Causes of VP Incompetence
• Cranial nerve damage
• Central neurological dysfunction
– Injury or neuromuscular disease
Cranial Nerve Damage
• Can cause velar paralysis or paresis
• Often unilateral
• Affected side of velum droops, causing a lateral gap
• Uvula points to unaffected side
• Common in hemifacial microsomia
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Central Neurological Dysfunction
• Injury
– Head trauma/traumatic brain injury
– Cerebral palsy
– CVA/stroke
• Neuromuscular Disease
– Myasthenia gravis, muscular dystrophy, etc.
Central Neurological Dysfunction
May cause:
• Hypotonia
• Dysarthria
• Apraxia of speech
• All of these can cause VP incompetence
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Hypotonia• Can cause poor or weak velar and pharyngeal
movement
• Pharyngeal hypotonia is common with velocardiofacial syndrome)
Dysarthria
• Affects all subsystems of speech:
– Respiration
– Phonation
– Articulation
– Velopharyngeal function
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Characteristics of Dysarthria
• Slurred, imprecise articulation
• Poor breath support
• Decreased volume
• Slow rate
• Hypernasality- common
Characteristics of Dysarthria
• Poor movement of anterior structures (for articulation) and posterior structures for (VP closure)
• Weakness increases with fatigue
• Gradual onset of dysarthria with hypernasality is often the first symptom of a neuromuscular disease
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Apraxia of Speech
• Motor speech disorder causing difficulty combining and sequencing motor movements
• Affects coordination of subsystems of speech:
– Articulation
– Phonation (voiced/voiceless errors)
– Velopharyngeal function (oral/nasal errors)
Apraxia of Speech
• Poor coordination, timing, and duration of VP closure
• Velum goes up inappropriately for nasal sounds and down for oral sounds
• Inconsistent hypernasality/hyponasality
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Velopharyngeal Mislearning
Velopharyngeal Mislearning
Causes:
• Hearing Loss/Deafness
• Secondary to VPI: Learned compensatory productions secondary to VPI
• Secondary to Mislearning: Misarticulations that cause nasal emission unrelated to a VPI
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Hearing Loss/Deafness
• Need auditory feedback because there is no tactile-kinesthetic feedback of VP movement
• Results in a mixture of hyper- and hyponasality
“Hypernasality” due to Misarticulations
• Nasalization of vowels
– Back of tongue too high on vowels
– Can be phoneme-specific on the high vowel /i/
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“Hypernasality” due to Misarticulations
• Substitution of nasal consonants for oral consonants (i.e., ng/l, ng/r)
Nasal Emission due to Misarticulation
• Due to pharyngeal or posterior nasal fricatives
• Causes phoneme-specific nasal air emission (PSNAE)
• Usually occurs on sibilants, particularly s/z
• Child is usually stimulable
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Recommendations for
VP Mislearning
• Speech therapy because this is a speech sound (articulation) disorder
• Surgery is NOT indicated!!!
• Differential diagnosis is very important!
Effects of Cleft Palate and VPI
on Speech and Resonance
• Abnormal resonance (sound)
• Nasal air emission (airflow)
• Dysphonia (sound)
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Abnormal Resonance due to CLP
• Hypernasality due to VPI or fistula
• Hyponasality or cul de sac resonance due to blockage
Nasal Air Emission
• Occurs with or without hypernasality
• Air leaks through the valve
• Occurs on high pressure consonants, particularly voiceless consonants
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Types of Nasal Emission
• Large opening
• Small opening
– Nasal Rustle (Turbulence)
Nasal Emission with Large Opening
• No impedance to airflow
• Soft, low intensity sound
• Affects articulation and utterance length
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Nasal Emission with Large Opening
Can also cause:
• Weak or omitted consonants
• Short utterance length
• Nasal grimace
• Compensatory articulation productions
Weak or Omitted Consonants
• Greater the nasal air emission, the weaker the consonants will be due to loss of oral air pressure
• Affects pressure-sensitive consonants
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Short Utterance Length
• Leak of air pressure causes need to increase respiratory effort and take more frequent breaths
• Utterance length becomes shortened
Nasal Grimace
• Contraction seen at side of nose or at nasal bridge
• Overflow muscle reaction in attempt to close VP valve
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Compensatory Productionsfor Palatal Fistula
Plosives (Stops)
• Velar plosive (backing of
anterior sounds)
Fricatives
• Velar fricative
• Production is behind the fistula, before air can escape through it.
Velar Fricative
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Compensatory Productionsfor VPI
Plosives (Stops)
• Pharyngeal plosives
• Glottal stops
Fricatives
• Pharyngeal fricatives
• Posterior nasal fricatives
• Glottal fricative (/h/)
• Nasal sniff
Pharyngeal Plosive
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Glottal StopCan be Co-Articulated
Pharyngeal Fricative
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Posterior Nasal Fricative
Posterior Nasal Fricative
• Back of tongue articulates against velum
• Air pressure forced into pharynx
• VP valve opens for release of air pressure
• Causes phoneme-specific nasal air emission (PSNAE)
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Glottal Fricative (/h/)
• Substituted for oral fricatives
Nasal Sniff
• Occurs as a substitution for sibilants, particularly /s/
• Usually occurs in the final word position
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Compensatory Productionsfor VPI
• Manner of production is maintained
• Placement is in pharynx to take advantage of air flow
• VP valve will be opened during production, so there will be associated nasal emission
Compensatory Productionsfor VPI
• Nasal emission is due to production, so persists, even after surgery for VPI
• Speech therapy is needed postoperatively to correct placement (which will eliminate nasal emission)
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Nasal Emission with Small Opening
• Characterized by an inconsistent nasal rustle (nasal turbulence)
• Due to bubbling of secretions as air forced through the small opening
• Distortion is loud and distracting
• Has no effect on strength of consonants or utterance length
• Usually does not occur with hypernasality
Nasal Emission with Small Opening
• Patient can usually close with effort
• Opening increases with motoric demands and fatigue
• Can correct “in therapy”- but child will not be able to maintain it
• Therefore, even a small structural gap will require surgical correction
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Dysphonia
• Hoarseness
• Breathiness
• Abnormal pitch
Dysphonia
• Vocal cord nodules due to strain in the vocal tract with VPI
• Laryngeal anomalies with craniofacial syndromes
• Compensatory strategy
– Breathiness and low volume mask hypernasality and nasal emission
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Prediction of Gap Sizebased on perceptual features
→Hypernasality, inaudible nasal emission, weak
consonants, short utterance length,
compensatory productions
→Hypernasality, audible nasal emission, weak
consonants, may have compensatory
productions
→Possibly mild hypernasality and audible nasal
emission
→Normal resonance, but inconsistent nasal rustle
(turbulence)