Final answer:
Hyperkalemia is the most serious electrolyte disorder associated with kidney disease. It can impair the function of muscles, the nervous system, and the heart. Conditions like renal failure, severe dehydration, and Addison's disease can lead to hyperkalemia.
Step-by-step explanation:
Hyperkalemia is the most serious electrolyte disorder associated with kidney disease. Hyperkalemia is an elevated level of potassium in the blood, which can impair the function of skeletal muscles, the nervous system, and the heart. It can lead to cardiac arrhythmias and even cardiac arrest. Hyperkalemia is often seen in conditions such as renal failure, severe dehydration, and Addison's disease.