Improvement Pattern of VFSS due to Swallowing Maneuvers in Patients of Dysphagia with Posterior Circulation Stroke
1,3,5Department of Physical Medicine and Rehabilitation, Institute of Post Graduate Medical Education and Research and SSKMH, Kolkata, West Bengal, India
2Department of Physical Medicine and Rehabilitation, Calcutta National Medical College, Kolkata, West Bengal, India
4Department of Neurology, Bangur Institute of Neurology, Institute of Post Graduate Medical Education and Research and SSKMH, Kolkata, West Bengal, India
Corresponding Author: Siddhartha Sinharay, Department of Physical Medicine and Rehabilitation, Institute of Post Graduate Medical Education and Research and SSKMH, Kolkata, West Bengal, India, Phone: +91 9038337475, e-mail: firstname.lastname@example.org
How to cite this article Ghosal A, Kumar De S, Sinharay S, et al. Improvement Pattern of VFSS due to Swallowing Maneuvers in Patients of Dysphagia with Posterior Circulation Stroke. Indian J Phys Med Rehab 2020;31(2):24–30.
Source of support: Nil
Conflict of interest: None
Background: Post-stroke dysphagia is a leading cause of morbidity and prolonged hospitalization in stroke patients. The videofluoroscopic swallowing study (VFSS) is one of the gold standard techniques, designed to define the anatomy and physiology of a patient’s oropharyngeal swallow and examine the effectiveness of selected rehabilitation strategies designed to eliminate aspiration or excess oral or pharyngeal residue (the symptoms of patient’s dysphagia).
Objective: To quantify the improvement of patients’ subjective and objective symptoms.
Materials and methods: Institutional ethics committee clearance was taken. Fifteen patients were selected who satisfy our inclusion criteria. A prospective interventional study was done in the Department of PMR, IPGMEandR, Kolkata over 12 months. Videofluoroscopic swallowing study was done on all these patients at baseline and at 3 months interval and swallowing technique of head rotation to the paretic side applied at baseline and Mendelsohn maneuvers were applied for 3 months duration. Changes in VAS of swallowing (VASs) and videofluoroscopic dysphagia scale (VDS) were noted.
Inclusion criteria: Clinical dysphagia in a patient with confirmed posterior circulation stroke, after 2 weeks of stroke.
Exclusion criteria: Anterior circulation stroke, Other pertinent neurological diseases, any structural abnormalities in head-neck region, medically unstable patient.
Results: Statistically significant improvements of both VASs and VDS were seen in all the patients in follow-up visits with the application of selected swallowing techniques and maneuvers.
Conclusion: This study concludes that:
- Simple swallowing techniques and maneuvers can improve the symptoms of dysphagia in patients with posterior circulation stroke.
- Videofluoroscopy is helpful to diagnose and objectively quantify the improvement of dysphagia symptoms with different swallowing techniques and maneuvers.
Keywords: Mendelsohn maneuver, Post-stroke dysphagia, Swallowing maneuvers, Videofluoroscopic swallowing study..
More than 50% of stroke survivors are affected by dysphagia.1 Fortunately, the majority of these patients recover swallowing function within 7 days, and only 11 to 13% remain dysphagic after 6 months.2,3
Among brainstem stroke patients, >70% had dysphagia and aspiration in videofluoroscopic swallowing study (VFSS).4
When lateral medullary syndrome patients were considered, dysphagia has been reported in 57 to 69%,5–8 though some studies showed less frequency.9 In a patient with medial medullary syndrome, dysphagia has been reported to 11,10 29,8 or as high as 78%.9
Another study with 64 patients in the post-acute phase of stroke concluded that pharyngeal safety was impaired more frequently in posterior territory lesion.13
The most feared complication of dysphagia after stroke is aspiration pneumonia. Dysphagia identified during bedside clinical examination was associated with an increase of 17% in the incidence of pulmonary infection compared to those that were not dysphagic (33 vs 16%, respectively).14
Dehydration and malnutrition also are common in dysphagic patients especially those who receive thickened liquids or modified diets. Forty-nine percent of stroke survivors admitted to a rehabilitation unit were malnourished, and that malnutrition was associated with dysphagia.15
Dysphagia can adversely impact the quality of life. Only 45% of dysphagic patients eat enjoyably, and eating is a time of panic or anxiety in about 41%.13,16 More than one-third of patients do not eat with others because of their dysphagia.16
The central pattern generator (CPG) for swallowing is located in the area of the nucleus tractus solitarius (NTS), the reticular formation, and nucleus ambiguus (NA) in the rostral and ventrolateral medulla.14–19 Its intraneuronal network controls the timing of the deglutition phases and integrates sensory and supramedullary afferent with efferent processes.17
Since these areas are crucial for pattern generation, a lateral medullary stroke (Wallenberg’s syndrome) can cause severe dysphagia resulting in aspiration.20,21 This lesion affects the CPG and the CNs involved in swallowing; paralyzes or weakens the ipsilateral pharynx, larynx, and the soft palate; and initiation and coordination of the pharyngeal stage of deglutition. Notably, electrophysiological studies demonstrate that the acute disconnection of contralateral swallowing centers also takes place.20
Patients with swallowing disorders may be aware of their problem and able to describe it to the clinician in great detail or may be entirely oblivious to any difficulty with deglutition. Those patients reporting oropharyngeal swallowing disorders and can describe them are typically highly accurate in their localization and definition of the problems.22,23 However, if a patient denies having a swallowing problem, he or she is frequently oblivious about their swallowing problem, even severe.24
There are emerging pieces of evidence that early detection of dysphagia reduces not only pulmonary complications but also the length of hospital stays and overall healthcare costs for acute post-stroke patients.25,26
Clinical bedside evaluation can provide clinician data regarding cognition, current medical history, history of dysphagia, nutritional and respiratory status, oral anatomy, labial and lingual control, respiration and its relation to swallow, palatal function, pharyngeal wall contraction, laryngeal control, patients reaction to oral sensory stimulation and patient reaction in an attempt to swallow.27,28 Though clinical evaluation provides valuable information, sensitivity and specificity for aspiration risk are generally low.29–31 Changes in voice quality32,33 and gag reflex33 were considered two important predictors of risk of aspiration. Clinicians could not identify aspiration in approximately 40% of time.34
The VFSS, also known as modified barium swallowing (MBS) study, is considered the gold standard for evaluation of oropharyngeal dysphagia.35,36 The VFSS allows the clinician to observe the important relationships between swallowing, food consistency, position, and ventilation.36,37 The process38 consisting of anteroposterior and lateral view of the oral-pharyngeal phase, with slow-motion features to allow characterization of the mechanism of swallowing and severity grading of dysfunction. Recent study reported early VFSS in acute stroke patients can determine most effective dysphagia management.39 During VFSS, some compensatory swallowing techniques can be applied to see any change. Swallowing techniques are designed to control the flow of food, eliminate the patient’s symptoms, and do not change the physiology of swallowing.40 It has been reported that rotating the head to the paretic side can direct the flow of bolus down a potentially more sensate and stronger side,41 though another study concluded no significant improvement in swallowing with head rotation in hemiplegic stroke patients.42
Mendelsohn maneuver is designed to increase the extent and duration of laryngeal elevation and thus increase the duration and width of cricopharyngeal opening.45 Mendelsohn maneuver increases laryngeal elevation, hyoid superior displacement, and prolongs the duration of upper esophageal sphincter opening.46 A recent study used dynamic area detector CT to find out the effect of the Mendelsohn maneuver on swallowing in healthy subjects.47 They concluded that it increases hyoid elevation and pharyngeal constriction, but there was no significant increase in the duration of UES opening. It has been reported that there was a significant improvement in swallowing in acute stroke patients with conventional swallowing therapy, which includes Mendelsohn maneuver and head rotation to paretic side.48
AIMS AND OBJECTIVE
This study is done to assess patients’ subjective and objective improvement in dysphagia after giving swallowing technique head rotation to paretic side and Mendelsohn maneuver and the role of VFSS.
MATERIALS AND METHODS
This prospective interventional study was done in the outpatient and inpatient department of Physical Medicine and Rehabilitation, IPGMER AND SSKMH, KOLKATA, from September 2018 to September 2019 (12 months). It was calculated that at least 15 patients would be needed to detect a statistically significant change in videofluoroscopy. Patients with clinically and radiologically(MRI and/or MRA) confirmed cerebrovascular accident involving posterior circulation, with history of dysphagia attending OPD and IPD of the department of Physical Medicine and Rehabilitation, IPGMER AND SSKMH, KOLKATA, were included in this study depending on inclusion and exclusion criteria.
- Age: 18 years and above.
- Clinical dysphagia in patients with confirmed posterior circulation stroke.
- More than equal to 2 weeks after stroke.
- First incident of stroke.
- Patient can communicate.
- Anterior circulation stroke.
- Other pertinent neurological diseases.
- Any structural abnormality or neoplastic disease in the head-neck region.
- Significant oropharyngeal incoordination.
- Medically unstable patients.
Patients were allergic to barium salts.
After approval by IPGMEandR Research Oversight Committee, detailed history taking and thorough clinical examination were conducted for every patient after taking written informed consent. Age, sex, duration of disease, and baseline data on stroke were obtained. Mini-Mental Score of all patients was 28 or more. Baseline history regarding dysphagia and clinical examination of cranial nerves and neurological examination was done to determine the exact nature of the stroke and further define overall impairment. MRI scan report and MRA scan report, if available, were obtained to confirm the location of stroke. All the patients and caregivers were counselled regarding the disease processes and the mainstay of treatment and their active role in treatment process. After that, the baseline VAS score of swallowing (VASs) was obtained for every patient. VAS score of swallowing (VASs)45 is a 10-point score for subjective evaluation of dysphagia where 0 point means no difficulties at all and 10 points means maximum difficulties or unable to swallow. For VFSS, patients were positioned properly and lateral and posterior-anterior view video taken with 2 and 5 mL of liquid in each and every patient and videofluoroscopic dysphagia scale (VDS) score was obtained. Videofluoroscopic dysphagia scale46 is a 14-point score with a range from 0 to 100 (Table 1).
All the patients and caregivers were taught the Mendelsohn’s maneuver thoroughly (Table 2). Patients were asked to do the Mendelsohn maneuver 45 minutes to 1 hour twice daily with a 2 to 3 hours gap between the sessions to prevent fatigue. Patients and caregivers were also advised regarding maintenance of nutrition and different food consistencies.
Follow-up assessment was done after 3 months and during follow-up VFSS was done again and no compensatory techniques were applied during follow-up VFSS. The data were tabulated in an excel sheet and analyzed according to standard statistical methods to fulfill the aims and objectives of the study. Baseline VASs were compared with baseline VASs with technique applied and VASs at 3 months, and baseline VDS score with baseline VDS with technique applied and VDS at 3 months. No comparison was done between baseline with technique scores and follow-up scores.
Process of Mendelsohn Maneuver
RESULTS AND ANALYSIS
Statistica Version 8 [Tulsa, Oklahoma: StatSoft Inc., 2007] was used.
Comparison of individual parameters against baseline values done by Student’s paired t-test. During analysis, p %3C; 0.05 was considered statistically significant. All numerical variables are normally distributed by Kolmogorov–Smirnoff goodness-of-fit test. There was no drop out in this study.
|Parameters||Coded value||Score (Max.)|
|Tongue to palate contact|
|Premature bolus loss|
|Oral transit time|
|Triggering of pharyngeal swallow|
|Pyriform sinus residues|
|Coating of the pharyngeal wall|
|Pharyngeal transit time|
The range of age was 37 to 78 years, with a mean age of 56.80 ± 12.02 years. Ten patients (67%) were male and 5 patients (33%) were female. The baseline VASs score was 8.13 ± 0.74 and the VDS score was 54.43 ± 11.23. Among 15 patients, 7 (46.67%) patients had aspiration, and 4 (26.67%) patients had supraglottic penetration in videofluoroscopy. There was significant improvement (p < 0.001) in both VASs score and VDS score with head rotation to the paretic side (Table 2). Significant improvement of both the parameters was found after 3 months follow-up (p < 0.001) (Table 3 and Figs 1 to 4).
|Parameters||Baseline||Baseline with tech.||p value|
|VDS||54.43 ± 11.23||47.13 ± 10.73||<0.001|
|VASs||8.13 ± 0.74||6.53 ± 0.64||<0.001|
|Parameters||Baseline||3 months||p value|
|VDS||54.43 ± 11.23||48.07 ± 10.68||<0.001|
|VASs||8.13 ± 0.74||6.67 ± 0.98||<0.001|
The range of age group of patients were 37 to 78, which was similar to Priya et al.47 All these patients had symptoms of dysphagia, but only four patients had a cough with a change in voice during bedside swallowing examination. No patients had altered gag reflex. In VFSS, we found supraglottic penetration in four patients, and aspiration (Fig. 4) in seven patients. We found that though the change in voice clinically correlates with videofluoroscopy findings, only 26.67% of patients had clinical symptoms of a total of 73.33% of patients who diagnosed as having penetration or aspiration in videofluoroscopy. This concludes that clinical examination was inaccurate in diagnosing aspiration. Similar findings were also reported in their study by Terre and Mearin.12 As posterior circulation stroke itself a risk factor for aspiration, VFSS is essential in evaluating these patients. The baseline VAS of swallow (VASs) was 8.14 ± 0.74, which was quite higher than a study done by Bulow et al.45 This is probably because their study included more chronic patients and excluded brainstem stroke. In our study, we found most of our patients’ pharyngeal phase of swallowing was affected. This finding was similar to the studies of Martino et al.42 and Logemann et al.41 Similar finding was also reported by Priya et al.47 The baseline VDS score was 54.43 ± 11.23, quite higher than a study done by Park et al.,48 who included unilateral hemispheric stroke and post 1-month stroke. Pyriform fossa residue has been given a higher value (13.5) in the VDS score. So, the mean VDS in our study was higher probably because we included post circulation stroke patients and more acute patients (2 weeks). In the videofluoroscopic study, there was an improvement in swallowing in all the patients with head rotation to the paretic side and statistically significant improvement (p < 0.001) seen in VDS and Visual Analog Scale for swallowing. This finding was similar to Logemann et al.40
In a study by McCullogh et al.,44 Mendelsohn maneuver was used to see any physiological change in swallowing, and participants performed them at home as an exercise program, but not during swallowing or VFSS examination. We considered a similar program in our study. Though sEMG biofeedback measure was not used during training of the Mendelsohn maneuver.
There was an improvement in swallowing and statistically significant improvement seen both in the VDS and visual analog scale for swallowing which was similar to McCullogh et al.44
No comparison was done between the swallowing technique and the Mendelsohn maneuver.
No major complications were seen in the patients.
It was a short-term study and the study group was very small. No control group was there and no long-term follow-up was done. Participants did the Mendelsohn maneuver at home and so compliance with the maneuver could not be ensured. sEMG biofeedback measure was not used during training of Mendelsohn maneuver, so proper technique could not be ensured and can decrease effectiveness. No comparison was done between the swallowing technique and Mendelsohn maneuver, so which of them is more effective.
Swallowing difficulty involved mainly the pharyngeal phase in the patients with posterior circulation stroke and a VFSS is an essential part of an evaluation to diagnose aspiration and silent aspiration in these patients. The compensatory technique of rotation of the neck to the paretic side and can improve the dysphagia symptoms and the Mendelsohn maneuver can improve and maintain the improvement of dysphagia symptoms in patients with posterior circulation stroke. Videofluoroscopy is helpful to objectively quantify the improvement of dysphagia symptoms with different swallowing techniques and maneuvers.
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