Final answer:
Hyperkalemia is a medical condition where blood levels of potassium are abnormally high, potentially causing cardiac and nervous system issues, including heart rhythm abnormalities and muscle weakness.
Step-by-step explanation:
Hyperkalemia is a condition characterized by high levels of potassium in the blood. It can impair the function of skeletal muscles, the nervous system, and particularly the heart. Hyperkalemia can result from factors such as increased dietary intake of potassium, certain diseases like Addison's disease, renal failure, and severe dehydration. The elevated potassium levels can lead to cardiac issues, such as abnormal rhythms, and in extreme cases, may result in the heart failing to relax properly after a contraction. Symptoms of hyperkalemia can also include mental confusion, numbness, and weakened respiratory muscles.