Which symptom might indicate serious complications during dialysis, such as seizures or coma?

The correct answer encompasses all of the listed symptoms, as each can indicate serious complications during dialysis. Weakness, blurred vision, and confusion are critical signs that may reflect significant imbalances or issues, such as electrolyte disturbances, particularly involving sodium or calcium, that can lead to severe outcomes like seizures or coma.

During dialysis, patients may experience shifts in fluid and electrolytes, which can affect the central nervous system. Weakness may suggest changes in muscle function, possibly due to low sodium levels (hyponatremia) or other metabolic imbalances. Blurred vision can also occur due to similar disturbances, affecting the brain's ability to process visual information. Confusion is a significant neurological sign that often emerges when the brain is not receiving adequate oxygenation or is affected by disturbed electrolyte levels.

Recognizing that these symptoms can coexist and may indicate a serious and potentially life-threatening situation emphasizes the importance of monitoring patients closely during dialysis. The presence of any of these symptoms should prompt immediate evaluation to determine the underlying cause and prevent further complications.