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Background and purpose  Impaired bulbar functions of speech and swallowing are among the most serious consequences of amyotrophic lateral sclerosis (ALS). Despite this, clinical trials in ALS have rarely emphasized bulbar function as an endpoint. The rater‐administered Amyotrophic Lateral Sclerosis Functional Rating Scale‐Revised (ALSFRS‐R) or various quality‐of‐life measures are commonly used to measure symptomatic benefit. Accordingly, we sought to evaluate the utility of measures specific to bulbar function in ALS.    Methods  We assessed bulbar functions in 120 patients with ALS, with clinicians first making direct observations of the degree of speech, swallowing and salivation impairment in these subjects. Clinical diagnosis of bulbar impairment was then compared with ALSFRS‐R scores, speech rate, time to swallow liquids and solids, and scores obtained when patients completed visual analog scales (VASs) and the newly‐developed 21‐question self‐administered Center for Neurologic Study Bulbar Function Scale (CNS‐BFS).    Results  The CNS‐BFS, ALSFRS‐R, VAS and timed speech and swallowing were all concordant with clinician diagnosis. The self‐report CNS‐BFS and ALSFRS‐R bulbar subscale best predicted clinician diagnosis with misclassification rates of 8% and 14% at the optimal cut‐offs, respectively. In addition, the CNS‐BFS speech and swallowing subscales outperformed both the bulbar component of the ALSFRS‐R and speech and swallowing VASs when correlations were made between these scales and objective measures of timed reading and swallowing.    Conclusions  Based on these findings and its relative ease of administration, we conclude that the CNS‐BFS is a useful metric for assessing bulbar function in patients with ALS.

Assessment of bulbar function in amyotrophic lateral sclerosis: validation of a self‐report scale (Center for Neurologic Study Bulbar Function Scale)