Abstract
Dysphagia is a prevalent complication following partial laryngectomy. We aimed to introduce a novel bedside evaluation tool, the modified Gugging Swallowing Screen (GUSS), and evaluate its reliability and validity in patients with open partial laryngectomy before oral feeding. We conducted a retrospective analysis of 120 patients with laryngeal cancer, including 40 hospitalized patients who underwent open partial laryngectomy. On the same day before oral feeding, we performed the modified GUSS, videofluoroscopic swallowing study (VFSS), and fiberoptic endoscopic evaluation of swallowing (FEES) to evaluate swallowing function. Two independent trained nurses assessed all patients for interrater reliability of modified GUSS. We compared the results of the modified GUSS with VFSS for predictive validity, and VFSS results for solid, semisolid, and liquid intake for content validity. The results of VFSS and FEES showed a strong correlation and consistency (rs = 0.952, p < 0.01; κ = 0.800 to 1.000, p < 0.01). The modified GUSS exhibited substantial to excellent interrater reliability across all classification categories (rs = 0.961, p < 0.01; κ = 0.600 to 1.000, p < 0.01) and demonstrated excellent consistency and predictive validity compared to VFSS (rs = -0.931, p < 0.01; κ = 0.800 to 1.000, p < 0.01). Content validity revealed that the risk of aspiration during solid intake was lower than that during semisolid intake (p < 0.01), and the risk of aspiration during semisolid intake was lower than that during liquid intake (p < 0.01), therefore confirming the subtest sequence of the modified GUSS. We successfully modified GUSS for patients with open partial laryngectomy. Moreover, the new bedside screening tool was validated as an effective tool for evaluating swallowing function and the risk of aspiration in patients with open partial laryngectomy before oral feeding.
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