Consistencies among miscellaneous scales for evaluation of post-stroke dysphagia

Purpose Post-stroke dysphagia (PSD) is the most common type of dysphagia. Stroke patients with sustained dysphagia have poorer outcomes. The severity of PSD is assessed using miscellaneous scales with unknown consistencies. We aim to investigate the consistencies among miscellaneous scales, which could aid in the assessment of PSD. Methods A total of 49 PSD patients were enrolled. Functional Oral Intake Scale (FOIS), Dysphagia Severity Scale (DSS), Ohkuma Questionnaire, Eating Assessment Tool-10, and Repetitive Saliva Swallowing Test were performed. FOIS was performed by physicians, and DSS was conducted by both the physicians and nurses; the physicians used either videofluoroscopy (VF) or videoendoscopy (VE) for evaluation; while, the nurses assessed PSD by observation and subjective judgment. Results When using VF (VF-DSS and VF-FOIS) as the gold standard for the evaluation, VE-FOIS ( κ = 0.625, 95% CI 0.300–0.950, p < 0.001) has a substantial agreement with VF-FOIS, and VE-DSS ( κ = 0.381, 95% CI 0.127–0.636, p = 0.007) has a fair agreement with VF-DSS. The weighted kappa of FOIS to DSS in VE (weighted κ = 0.577, 95% CI 0.414–0.740, p < 0.001) is not lower than that in VF (weighted kappa = 0.249, 95% CI 0.136–0.362, p < 0.001). Conclusion For both DSS and FOIS, only VE has a statistically significant agreement with VF. Though VF has been viewed as the traditional gold standard of dysphagia screening, it has the limitations of being invasive and equipment dependent. For PSD, VE could be considered as a substitution when VF is not available or suitable.