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Hypotension is a common complication that must be monitored during hemodialysis due to the nature of the treatment process. During hemodialysis, excess fluid is removed from the bloodstream to help maintain fluid balance and remove waste products. This rapid removal of fluid can lead to a significant drop in blood pressure, particularly if the patient is not adequately volume-resuscitated or if fluid removal is too aggressive.

It is crucial to monitor blood pressure throughout the treatment to identify drops that could indicate hypotension. Signs of hypotension during hemodialysis can lead to symptoms such as dizziness, weakness, or nausea, and if left unaddressed, it could result in more severe complications.

While dehydration, hyperkalemia, and allergic reactions can also occur, they are notably less frequent or are managed differently in the context of hemodialysis. Dehydration, for example, is typically addressed prior to treatment. Hyperkalemia is monitored but generally rectified during the dialysis process itself. Allergic reactions, though they could overlap with various complications depending on the patient's condition, are less commonly associated with the immediate risks of the hemodialysis treatment compared to the critical concern of managing blood pressure. Thus, hypotension remains the foremost complication