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The kidneys manage three things: volume, potassium, and acid. Take that job away, and all three go wrong at once. So every renal-failure presentation you'll see is one of those three failing.
Dialysis is the machine doing that job on a schedule. Miss a session, and volume and potassium both start climbing between now and the next run. That's the hinge for this whole section. A dialysis patient's problem almost always traces back to either too much volume or too much potassium, and the two look nothing alike.
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