Why do we use withdrawal times for feed additives like

An 83-year-old female presented with history of recurrent pneumonia. Her primary complaints were gurgling in the mouth and neck, progressive dysphagia, and coughing during meals intermittently with solids and liquids. She was seen for a clinical swallow examination (CSE). Cranial nerve examination: normal strength and range of motion of oropharyngeal musculature. Swallow complaints were consistent with findings on CSE. She was recommended and scheduled for a modified barium swallow study (MBS). An MBS was performed and revealed a large pouch that filled with barium when the patient swallowed. It didn’t clear when she swallowed. What is the pouch called? A. Hypertrophy of the cricopharyngeus. B. Achalasia. C. A large Zenker’s diverticulum. D. Hiatal hernia.

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