| Sumario: | Purpose: The Dynamic Imaging Grade of Swallowing Toxicity (Version 2; DIGEST) is a videofluoroscopy (VF) scale that measures pharyngeal swallowing severity based on functional measures of swallowing safety and efficiency. Original validation is based on a standard VF testing protocol including thin liquid, puree, and solid consistencies. Given that thickened liquid bolus trials are common in VF clinical testing protocols, we sought to determine the agreement in DIGEST grades with and without the inclusion of moderately thick liquid bolus trials on DIGEST outcomes in people with amyotrophic lateral sclerosis (pALS). Method: This study represents a secondary analysis of VF examinations from a prospective longitudinal study conducted in 109 pALS. VF evaluations contained 10 barium trials spanning three International Dysphagia Diet Standardisation Initiative (IDDSI) levels (0-7). Duplicate, independent, and blinded ratings were completed. DIGEST Efficiency and Safety grading was then completed under two conditions--with and without the inclusion of moderately thick liquid bolus trials into DIGEST grading--to produce two sets of DIGEST ratings for each VF study. Descriptives, percent agreement, and a weighted Cohen's kappa were performed on DIG EST grades. Results: A total of 373 VF examinations were included in this analysis. DIGEST grade percent agreement with and without IDDSI Level 3 was excellent for Safety (98.1%), Efficiency (93.8%), and Total (94.1%) grades. Kappa values for Safety, Efficiency, and Total grades were .96, .89, and .91, respectively, indicating excellent agreement across bolus trial inclusion methods. Conclusions: Standard inclusion of moderately thick liquid bolus trials did not significantly impact DIGEST grading in this data set. These results add to the preliminary but growing evidence suggesting stability of DIGEST grading with alternate bolus protocols in another patient population.
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