Barium swallow test. A test in which a patient swallows a thick white substance and the swallowing process is filmed to detect possible abnormalities.

Blepheroplasty. Any operation for the correction of a defect in the eyelids.

Bradyarrhythmia. Any disturbance of the heart's rhythm resulting in a rate of under 60 beats per minute.

Bulbar weakness. Presence of weakness in the tongue, lips, palate, pharynx and larynx.