Paula Leslie

Assessing penetration and aspiration : how do videofluoroscopy and fiberoptic endoscopic evaluation of swallowing compare?

Objectives/Hypothesis: We aimed to investigate whether the type of dysphagia examination (fiberoptic endoscopic evaluation of swallowing [FEES] or videofluoroscopy) influences the scoring of penetration and aspiration.

Reliability and validity of cervical auscultation: a controlled comparison using videofluoroscopy.

Cervical auscultation is experiencing a renaissance as an adjunct to the clinical swallowing assessment. It is a controversial technique with a small evidence base. We have aimed to establish whether cervical auscultation interpretation is based on the actual sounds heard or, in practice, influenced by information gleaned from other aspects of the clinical assessment, medical notes, or previous knowledge. We sought to determine (a) rater reliability and its impact on the clinical value of cervical auscultation and (b) how judgments compare with the “gold standard”: videofluoroscopy. Swallow sounds were computer recorded via a Littmann stethoscope. Sounds were sampled from 10 healthy control swallows with no aspiration/penetration and 10 patient swallows with aspiration/penetration, all recorded during simultaneous videofluoroscopy. The system generated sound quality similar to “live” bedside listening, a feature rarely seen in cervical auscultation studies. The 20 sound clips were classified as “normal” or “abnormal” by 19 volunteer speech–language pathologists with experience in cervical auscultation. After at least four weeks, 11 of these judges rated the sounds rerandomized on a new CD. Intrarater reliability kappa ranged from −0.12 to 0.71. Individual reliability did not correlate with years of experience, practice pattern, or frequency of use. Interrater reliability kappa = 0.17. Comparison with radiologically defined aspiration/penetration yielded 66% specificity, 62% sensitivity, and majority consensus gave 90% specificity, 80% sensitivity. There was a significant relationship between individual reliability and true positive rate (rs = 0.623, p = 0.040). The reliability of individual judges varied widely and thus, inevitably, agreement between judges was poor. Validity is dependent upon reliability: Improving the poor raters would improve the overall accuracy of this technique in predicting abnormality in swallowing. The group consensus correctly identified 17 of the 20 clips so we may speculate that the swallow sound contains audible cues that should in principle permit reliable classification.

Fibreoptic endoscopic evaluation of swallowing and videofluoroscopy: does examination type influence perception of pharyngeal residue severity?

Objectives:  The aim of the study was to investigate whether the type of instrumental swallowing examination (Fibreoptic Endoscopic Evaluation of Swallowing (FEES) or videofluoroscopy) influences perception of post‐swallow pharyngeal residue.

Investigation and management of chronic dysphagia

Timely intervention by a multidisciplinary team can prevent or ameliorate the complications of chronic dysphagia, reducing the burden of this common and diverse condition

Cervical Auscultation Synchronized with Images from Endoscopy Swallow Evaluations

Cervical auscultation is the use of a listening device, typically a stethoscope in clinical practice, to assess swallow sounds and by some definitions airway sounds. Judgments are then made on the normality or degree of impairment of the sounds. Listeners interpret the sounds and suggest what might be happening with the swallow or causing impairment. A major criticism of cervical auscultation is that there is no evidence on what causes the sounds or whether the sounds correspond to physiologically important, health-threatening events. We sought to determine in healthy volunteers (1) if a definitive set of swallow sounds could be identified, (2) the order in which swallow sounds and physiologic events occur, and (3) if swallow sounds could be matched to the observed physiologic events. Swallow sounds were computer recorded via a Littmann stethoscope from 19 healthy volunteers (8 males, 11 females, age range = 18–73 years) during simultaneous fiberoptic laryngoscopy and respiration monitoring. Six sound components could be distinguished but none of these occurred in all swallows. There was a wide spread and a large degree of overlap of the timings of swallow sounds and physiologic events. No individual sound component was consistently associated with a physiologic event, which is a clinically significant finding. Comparisons of groups of sounds and events suggest associations between the preclick and the onset of apnea; the preclick and the start of epiglottic excursion; the click and the epiglottis returning to rest; the click and the end of the swallow apnea. There is no evidence of a causal link. The absence of a swallow sound in itself is not a definite sign of pathologic swallowing, but a repeated abnormal pattern may indicate impairment. At present there is no robust evidence that cervical auscultation of swallow sounds should be adopted in routine clinical practice. There are no data to support the inclusion of the technique into clinical guidelines or management protocols. More evaluation using imaging methods such as videofluoroscopy is required before this subjective technique is validated for clinical use by those assessing swallowing outside of a research context.

Swallow Respiration Patterns in Dysphagic Patients Following Acute Stroke

AbstractThe aim of this study was to examine swallow respiratory characteristics using a notebook computer system. A relatively simple system assessing easily identifiable features is more likely to be incorporated into everyday clinical practice. Eighteen patients (age range = 51–82 years) with dysphagia poststroke and 50 healthy volunteers (age range = 20–78 years) were recruited. The patient group was less likely to always breathe out postswallow on water (9/15 cf 46/49), and some did not breathe out immediately postswallow at all (3/15 cf 0/49, p < 0.01). The pattern was similar with yogurt. Multiple swallowing was identified in the patient group and surprisingly with a large number of the volunteers for all bolus types but was more common in the patient group (p < 0.01). This trait is usually attributed to impaired swallows; that it is prevalent in the normal population has implications for using it as a dysphagia marker in clinical assessments. Yogurt has intrinsic features that increase multiple swallowing and caution should be used when identifying an impairment based on multiple swallowing with such a test substance. In the control group there was a high correlation of swallow apnea on 5 mL of water compared with 20 mL of water (r = 0.759, p < 0.01) and 5 mL of yogurt (r = 0.871, p < 0.01), indicating a possible individual swallow respiration pattern. This was also evident in the patient group. No significant difference in length of swallow apnea was found between the two groups. No evidence was found to link swallow respiration characteristics with aspiration as identified on simultaneous videofluoroscopy. The patient group had a wide range of impairments which suggests that stroke severity is not the sole determinant of swallow respiratory changes.

Adult dysphagia assessment in the UK and Ireland: are SLTs assessing the same factors?

This is the first study to examine dysphagia assessment practices of UK/Ireland speech and language therapists. The aims were to (1) examine practice patterns across clinicians, (2) determine levels of consistency in practice, and (3) compare practices of clinicians in the UK/Ireland with those previously reported of clinicians in the United States. A questionnaire, developed for earlier U.S. research, was adapted following a pilot study. The resulting email survey was completed by 296 speech and language therapists working with dysphagic adults. Respondents were asked to rate how frequently they use 31 components of a clinical dysphagia examination. Consistency was determined by calculating the percentage of respondents who agreed on frequency of use. Low frequency of use was reported for four components: trials with compensatory techniques, obtain patient’s drug history, assessment of speech articulation/intelligibility, and screening/assessment of mental abilities. Variability among clinicians was high, with inconsistency observed for 6/31 components (19%) and high consistency for only 10/31 (32%). Results were compared with data from the earlier U.S. study. Notable differences in practice were observed for five components: cervical auscultation, trials with compensatory techniques, gag reflex, assessment of sensory function, and screening/assessment of mental abilities. Inconsistency among UK/Ireland clinicians was higher than in the comparator U.S. study. The clinical implications of these findings are discussed.

Radiation dose in videofluoroscopic swallow studies

Videofluoroscopy has become an increasingly important armament in the investigation and assessment of swallowing disorders. However, very little work has been published on the radiation dose used in such examinations and currently there is no national diagnostic reference level in the United Kingdom. Videofluoroscopy in our hospital is performed predominantly by one radiologist (IZM) in a single fluoroscopy room. We recorded the screening times of 230 patients over a 45-month period. Screening time ranged from 18 to 564 s (median = 171 s) associated with a median dose-area product of 1.4 Gy cm2. This is below the third quartile level of 2.7 Gy cm2 for all such examinations performed across the northern England. The effective dose associated with a typical videofluoroscopy dose-area product is 0.2 mSv. Videofluoroscopy is the most appropriate instrumental examination for assessing oropharyngeal swallow biomechanics and intervention strategies. This data set is based on the largest number of videofluoroscopy swallow studies published to date. Our results show that videofluoroscopy can be performed using minimal radiation doses.

Oropharyngeal dysphagia: the experience of patients with non-head and neck cancers receiving specialist palliative care.

Background: Difficulty swallowing is a well-documented symptom in head and neck cancer and oesophageal malignancy. The frequency of oropharyngeal swallowing difficulties in the palliative phase of other malignancies is less reported. Aim: 1) To describe the patient experience of swallowing and associated difficulties while receiving specialist palliative care for malignancies other than those affecting the head and neck and 2) to identify the quality of life issues for the participants with dysphagia and compare with normative and dysphagic data provided by SWAL-QOL. Design: Four month prospective pilot study - questionnaire design. Setting: Acute teaching hospital. Participants: Eleven patients receiving specialist palliative care. Methods: Participants were interviewed using a modified version of the SWAL-QOL, a validated quality of life assessment tool for use specifically with people with oropharyngeal dysphagia. Eight quality of life domains were explored as well as fourteen dysphagic symptoms. Results: Seven of the 11 participants had dysphagic symptoms detailed in the SWAL-QOL and a further two patients reported transient dysphagic symptoms since diagnosis of their disease. Nine participants reported an impact on their quality of life and three reported a considerable impact in four or more domains. Eight of the 11 participants had self-selected softer textured foods. A notable group were three patients with lung cancer and one with lung metastases with a history of vocal fold motion impairment, all of who had experienced dysphagic symptoms since diagnosis. Conclusions: Patients with cancers not affecting the head and neck are at risk of developing symptoms of oropharyngeal dysphagia and subsequently, compromized nutrition, hydration and quality of life. Areas for further research are suggested. Palliative Medicine 2007; 21 : 567—574

Objective Computer-Based Assessment of Valleculae Residue – Is It Useful?

There have been questions about the reliability of subjective rating scales used to assess valleculae residue from fluoroscopic images. The aim of this study was to assess interrater agreement on one such scale, and compare it with agreement using a new objective measurement scale. Five speech and language therapists rated 100 valleculae residue still images from 20 consecutive patients using standard clinical practice (i.e., subjective visual grading of the videofluoroscopy still and rating as none, mild, moderate, or severe). The images were rerated by the same clinicians using Picture Archiving Communication System measurement tools. The valleculae residue ratio relates the residue size to the size of an individual’s valleculae. A valleculae residue ratio scale was devised using a linear classifier, which defines the cutoff between grades of valleculae residue (none, mild, moderate, and severe). The new method proved at least as reliable as the traditional method; for interrater reliability, kappa = 0.73 vs. 0.73; for intrarater reliability, kappa = 0.87 vs. 0.85. The valleculae residue ratio is proposed as a new quick reliable method of quantifying residue where the Picture Archiving Communication System is available. We now wish to test the impact of this method where poor inter- and intrarater reliability exists.