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. 2016 Mar;8(3):632–639. doi: 10.21037/jtd.2016.02.60

Figure 4.

Figure 4

The natural course of functional decline in most elderly people. With aging, brain function declines. With declining brain function, dysphagia starts, followed by dystussia, and then finally atussia and silent aspiration, which is closely related to death from pneumonia.