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Using a cold compress is recommended for managing high potassium (K+) levels because cold therapy can help reduce swelling and inflammation, potentially aiding in the body's ability to lower potassium levels. High potassium levels can lead to various complications, including hyperkalemia, which can affect heart function and muscle contraction.

By applying a cold compress, the body can experience vasoconstriction, which may assist in reducing potassium transfer from tissues into the bloodstream. Cold therapy also provides an immediate effect that can be useful in acute circumstances where rapid potassium management is necessary.

In contrast, warm or hot compresses might increase blood flow, potentially worsening the situation by promoting the release of potassium from cells. Room temperature does not provide the therapeutic effects needed in this context. Therefore, cold compresses are favored in scenarios associated with high potassium levels due to their physiological effects that can help manage this condition.