Prognosis prediction for impaired consciousness recovery in stroke patients using videofluoroscopic swallowing study: A retrospective observational study

Abstract

Prognosis prediction of impaired consciousness is clinically important for establishing therapeutic strategies, determining a rehabilitative goal and functional outcome, and estimating rehabilitative therapy duration. In this study, we investigated the prognosis prediction value of videofluoroscopic swallowing study (VFSS) in recovery of impaired consciousness in stroke patients. Fifty-one patients with impaired consciousness who underwent VFSS during the early stage of stroke between 2017 and 2021 were recruited in this retrospective study. VFSS were performed using modified Logemann protocol, and bonorex was used as the liquid contrast medium. The penetration-aspiration scale (PAS) was graded for all patients, and they were classified into 2 groups depending on the presence of aspiration on liquid material: the aspiration-positive group with a PAS score ≥ 6, and the aspirationnegative group with a PAS score < 6. The coma recovery scale-revised (CRS-R) was used to evaluate patients' conscious state at the time of VFSS and 3 months after. Statistical analysis was performed using independent t test and Pearson's correlation. The increase in total CRS-R score from time of VFSS to 3 months later was greater in aspiration-negative group than in aspirationpositive group (P < .05). A moderate negative correlation was observed between liquid PAS score and the increase in total CRS-R score (r = −0.499, P < .05). Among 6 CRS-R subscales, a strong negative correlation was observed between liquid PAS score and the communication score increase (r = −0.563, P < .05), while moderate negative correlations were detected between liquid PAS score and the increases in auditory (r = −0.465, P < .05), motor (r = −0.372, P < .05), oromotor (r = −0.426, P < .05), and arousal (r = −0.368, P < .05) scores. We observed that patients without aspiration on videofluoroscopic swallowing study showed better recovery of impaired consciousness, and the degree of penetration and aspiration had a predictive value for impaired consciousness prognosis in the early stage of stroke.