The second thing that happens is the nasopharynx is sealed. This rarely goes astray but it has to be done to get the bolus to go the right way. The airway by the epiglottis flipping over is protected, which channels the food down in the correct direction, the bolus. Finally there Finally, things can be left behind in the oropharynx. And it s not that abnormal.
Older patients tend to have a residual on barium swallow.
If they don t aspirate, that s probably not pathology and you shouldn t change the way you feed them just based on a small amount of residual on barium study. They are multiple. You have to be careful with this. They are common. We heard from Rick dysphagia is common.