Artery I have no idea what 'dysentery' means, and I have little idea of 'artery' means either, they just look alike and both sound biology related.
Traffic jam (A local newscaster used to refer to the highways in this state as arteries and they were always jammed up.) Dysentery, to put it nicely, is when you have to run for the bathroom to go #2. It causes dehydration due to the loss of liquids. Artery is a good choice, it has 4 out of 6 letters in the same order.