What is the primary function of a fiberoptic endoscopic evaluation of swallowing (FEES)?

The primary function of a fiberoptic endoscopic evaluation of swallowing (FEES) is to assess the movements and sensation of swallowing structures. During this procedure, a small, flexible endoscope is inserted through the nasal passage to visualize the pharynx and larynx while the patient swallows various food and liquid consistencies. This real-time visualization allows clinicians to observe how well the swallowing structures, such as the tongue, pharynx, and vocal cords, are functioning.

By seeing these anatomical structures in action, FEES can help identify any abnormalities in the swallowing process, including issues like aspiration, residue, or airway protection. It provides valuable insights into the coordination of the swallowing mechanism and the sensory aspects involved, which are essential for diagnosing swallowing disorders and guiding treatment decisions effectively.

The other options do not accurately capture the primary function of FEES, as it is not primarily concerned with measuring esophageal muscle strength, analyzing food composition, or performing taste evaluations. Each of those areas might pertain to other specialized tests or assessments.