Which of the following is considered a sign of hyperkalemia?

Weakness is a classic sign of hyperkalemia, which refers to an elevated level of potassium in the blood. High potassium levels can interfere with the normal electrical activity of muscle cells, including those in the heart and skeletal muscles, leading to weakness and fatigue. In some cases, it can also progress to paralysis if not addressed.

While low blood pressure can occur with hyperkalemia, it is not a primary or direct indicator of this condition, as numerous factors could contribute to blood pressure changes. Increased urine output is typically associated with conditions that promote diuresis and does not directly relate to hyperkalemia. Severe anxiety is not linked with potassium levels and is more related to psychological conditions rather than electrolyte imbalances. Hence, among the options, weakness is the most specific and recognized sign of hyperkalemia.