A nurse is caring for a client who is receiving IV fluid therapy. For which of the following findings should the nurse monitor as an adverse effect of the IV fluid therapy?

A. Bradycardia: Bradycardia is an uncommon response to IV fluid therapy; more frequently, fluid overload can cause tachycardia as the heart attempts to compensate for increased blood volume. Bradycardia would more likely result from other cardiac or neurological issues rather than fluid administration. B. Weight loss: IV fluid therapy generally results in fluid retention or maintenance of body weight; weight loss is not expected unless there is concurrent fluid loss or other underlying conditions. Monitoring weight gain is important to detect fluid overload rather than weight loss. C. Distended neck veins: Distended neck veins are a classic sign of fluid volume overload, indicating increased central venous pressure due to excess fluid in the circulatory system. This finding requires prompt intervention to prevent complications such as pulmonary edema or heart failure. D. Bradypnea: Slow respiratory rate is rarely caused by IV fluids and more commonly indicates neurological impairment, sedation, or respiratory muscle fatigue. It is not a typical adverse effect of fluid therapy and should prompt evaluation for other causes.