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DYSPHAGIA ASSESSMENT AND TREATMENT PLANNING: A TEAM APPROACH
1cc Bolus: Patients vs. Controls
1.6
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Timing in
Seconds
Bolus arrives in the Vallecula (BV1)
before the onset of swallowing
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b1 AE startH1BV1 BV2AE
Patient UES opening (Pop) occurs before arrival of the bolus at the UES (BP1)
PopBP1 H2 PES
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HL maxH3PA maxPCL Em
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pt average control ave
20cc Bolus
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In Patients, Bolus Arrives at the Vallecula (BV1) before the
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Onset of Swallowing Gestures. The airway closes (AE close)
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Figure 17–8. A. Comparison of patients and controls 1 cc: in patients, the bolus arrives
at the vallecula prior to the onset of swallowing gestures. The pharyngoesophageal segment (UES) opens before the bolus arrives at the UES (Bp1). This finding may repre­sent a strategy developed by patients to improve movement of the bolus through the UES compensating for poor pharyngeal pressures behind the bolus. B. Comparison of patients and controls 20 cc: similar to the 1-cc bolus; when swallowing 20 cc, the patient allows the bolus to arrive at the vallecula prior to the onset of swallowing ges­tures. This delay in swallow initiation may represent a change in sensation. There is also a delay in airway closure relative to arrival of the bolus at the UES. continues
study, therapy could be based on the most common abnormalities identified to date: (a) pharyngeal residue (consis­tent with poor pharyngeal constriction needed to clear the bolus from the phar­ynx) and poor tongue base retraction (an important component of adequate
pharyngeal constriction), (b) reduced hyoid elevation, and (c) inability to adjust coordination of swallowing ges­ture to accommodate larger bolus size. Although therapy designed to improve contraction of the pharyngeal constric­tors is limited, tongue base exercises
Timing in
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C
Timing in
Seconds
17. DYSPHAGIA IN HEAD AND NECK CANCER PATIENTS
Comparison of Control 1 and 20 cc Bolus
1.2
For 20cc, the bolus arrives at the
1
UES much sooner (BP1) so airway protection happens faster too
0.8
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b1 AE startH1BV1 BV2AE
-0.2
PopBP1 H2 PES
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HL maxH3PA maxPCL Em
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control ave 1cc control ave 20cc
Swallowing Events
Comparison of Patient 1 and 20cc Bolus
2
1.8
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b1 AE startH1BV1 BV2AE
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pt average 1cc pt average 20cc
Swallowing Events
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D
Figure 17–8. continued C. Normal adjustments in gesture timing in response to
increased bolus size: gestures occur earlier to protect the airway. D. Patients are unable to vary the gesture timing to accommodate the larger bolus size. The airway closes after arrival of the bolus at the UES for the larger bolus. This may create a risk for aspiration.
may be helpful. Therapy regimens intending to improve hyoid elevation have been established to be effective and can be applied to this patient popu­lation as well. Therapy should include strategies to improve airway protec­tion early in the swallow and should include work with larger bolus sizes. Further studies are needed to evaluate the results of these interventions during and after treatment.
QUALITY OF LIFE
The lingering effects of head and neck cancer treatment have an impact on overall quality of life. Especially when more than one treatment modality exists and both provide equal oncologic outcome, it is important to determine the impact of each treatment on over­all functioning and therefore quality of life. In the instance of head and neck
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DYSPHAGIA ASSESSMENT AND TREATMENT PLANNING: A TEAM APPROACH
cancer treatment, surgery followed by radiation therapy and primary chemo­radiation therapy with and without a neck dissection result in equal overall prognosis for cure. The impact of these treatments on swallowing function, however, determines their effect on long-term quality of life.
Most studies of quality of life in head and neck cancer patients have demon­strated a decrease in nearly all param­eters of health-related quality of life during and immediately after chemora­diation treatment, with improvements beginning around 6 months later, when the acute effects of therapy are dimin­ishing. Studies looking specifically at swallowing function, however, note a deterioration of swallowing function at 3 months with little improvement at the 12-month posttreatment point (Wilson et al., 2011). Long-term quality­of-life studies in head and neck cancer patients are relatively few but docu­ment persistent swallowing dysfunc­tion (Aylward et al., 2019). In a study of 62 head and neck cancer patients treated with chemoradiation who had survived at least 5 years after their diagnosis, Campbell et al. (2004) found that 44% of the patients demonstrated at least some aspiration on a videofluo­roscopic swallowing study and 21% silently aspirated. In this study, aspira­tion was significantly associated with diminished quality of life scores for chewing, swallowing, and normalcy of diet. Another study of 337 similar patients revealed that less than half reported normal or near-normal func­tioning for eating (Funk et al., 2012). Kendall et al. (2014) found no strong correlation between quantitative mea­sures of swallowing function and qual-
ity-of-life scores 1 year after chemora­diation treatment, leading the authors to conclude that patient perception of the impact of swallowing function on quality of life does not correlate well with actual physiologic functioning. Clinicians involved in management of these patients should not rely on patient reports of function but must perform a complete evaluation to determine the specific pathophysiology affecting indi­vidual patients.
When quality-of-life studies are con­ducted comparing patients treated by laryngectomy and postoperative radi­ation therapy to patients treated with chemoradiation for laryngeal cancer, the results indicate that laryngectomy patients report diminished satisfaction in the domains of speech and shoulder functioning and that chemoradiation therapy patients report worse satisfac­tion in the domains of chewing and swallowing (Lotempio et al., 2005). One might conclude that patients under­going total laryngectomy are more affected by their speech rehabilitation challenges than by any swallowing difficulties and that patients treated with chemoradiation, while maintain­ing excellent speech capabilities, may suffer significantly with dysphagia. Patient treatment options that consider the location and size of the tumor will be better defined as further studies bring to light the potential long-term effects of each treatment option.
CONCLUSION
The variability inherent in head and neck cancer patients, with respect to location and size of the tumor, as well
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as treatment modality, creates sig­nificant difficulty when categorizing patients into groups for comparison of outcome studies involving deglutition. Each patient must be considered indi­vidually. Other factors, including the overall medical condition, social situ­ation, and support system, will likely influence the patient’s ability to achieve adequate safe oral intake and maintain nutritional requirements.
Our goal, as clinicians, is to opti­mize the functioning of each individual patient after first effectively eradicating the cancer. Surgeons must continue to consider the structures involved in the tumor and thoughtfully reconstruct defects in such a way to minimize functional deficits and obstruction to bolus flow. Radiation oncologists must continue to evaluate strategies for mini­mizing radiation scatter and determine the minimal dose required for effec­tive treatment of any given tumor. Speech-language pathologists must be involved with the care of these patients before they begin treatment. Swallow­ing function must be assessed prior to treatment, and strategies for safe, effective swallowing during treatment must be determined. Swallowing exer­cises must be initiated and, if possible, continued during treatment. Patients should be monitored closely in the post­treatment period and encouraged as they begin to expand their oral intake. Patient perceptions of function may not accurately reflect actual swallowing abilities.
There is still substantial research to be done in the area of swallowing func­tion after treatment for head and neck cancer. In particular, objective data on the effect of swallowing exercises dur-
ing treatment on long-term swallowing outcomes are needed. The potential to improve the long-term swallowing function, and thus the quality of life, in head and neck cancer patients is significant.
STUDY QUESTIONS
1. How does tongue tethering impact swallowing function? For example, if the tongue is tethered to the ante­rior oral cavity (as in primary clo­sure of an anterior floor of mouth defect), how does that affect the movement of the bolus through the pharynx?
2. What are the consequences (for swallowing) of a palatal defect?
3. What reconstructive options are available to repair a tongue defect, and what is the potential impact of each option on swallowing function?
4. How does poor hyoid bone eleva­tion impact swallowing function?
5. What pretreatment factors best pre­dict the likelihood of developing dysphagia after treatment for head and neck cancer?
6. Discuss the use of nonoral feeding during chemoradiation therapy. What are the pros and cons?
7. What structures are removed dur­ing an open supraglottic laryngec­tomy? What are the implications for swallowing function?
8. What clinical factors increase the risk of dysphagia after chemoradia­tion therapy?
9. What treatment factors increase the risk of developing dysphagia after chemoradiation therapy?
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DYSPHAGIA ASSESSMENT AND TREATMENT PLANNING: A TEAM APPROACH
10. What is the incidence of aspiration in long-term (greater than 5 years) survivors of head and neck cancer?
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