Which symptom might indicate that a patient is experiencing hypotension during hemodialysis?

Dizziness and fainting are key symptoms that can indicate hypotension during hemodialysis. Hypotension, or low blood pressure, can occur due to fluid removal during the treatment process, leading to a drop in blood volume. This can impair blood flow to the brain, resulting in symptoms such as light-headedness, dizziness, or syncope (fainting). Patients may feel these symptoms as their blood pressure decreases significantly, especially when they stand up quickly after the treatment.

The other options presented have different associations. Excessive thirst may be seen in patients with fluid retention rather than hypotension. Increased urination is more often related to improved kidney function or recovering from fluid overload. Intense fatigue can occur for various reasons but is not specifically a direct indicator of hypotension during hemodialysis. Understanding these distinctions helps in identifying the seriousness of symptoms the patient may be experiencing during treatment.