Eli5:Why does a bladder distention usually lead to Autonomic Dysreflexia?

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What is the pathaphyssiology behind this?

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The bladder distention is the trigger, but it is the spinal cord injury that is the cause. I really don’t know how to explain this to a 5 year old, but basically:

You hurt your back —> signals from the brain have a hard time getting past the injury —> your bladder gets full and starts sending signals that it needs to empty —> the nerve impulse for that cannot pass the spinal injury —> the brain gets angry and starts sending out a bunch of signals—> these signals cause your blood pressure to rise —> your heart sees the BP increase and slows down