A nurse is collecting data from a client who has hyperparathyroidism and is receiving 0.9% sodium chloride via IV infusion. Which of the following manifestations should the nurse identify as an adverse effect of the treatment?

Rationale: A. New onset of hearing loss: Hearing loss is not a typical adverse effect of 0.9% sodium chloride infusion. It may occur with high-dose loop diuretics like furosemide but is unrelated to isotonic fluid administration or hyperparathyroidism management. B. Kussmaul respirations: These are deep, rapid respirations seen in metabolic acidosis, particularly diabetic ketoacidosis. They are not associated with isotonic fluid infusion or calcium disturbances in hyperparathyroidism. C. Hyperthermia: Elevated body temperature is not linked to 0.9% sodium chloride infusion. Hyperthermia may occur with infections or neurologic injury, but not as a direct consequence of isotonic fluid therapy. D. Chvostek's sign: Chvostek's sign is a clinical indicator of hypocalcemia, which can occur as an adverse effect of 0.9% sodium chloride infusion in clients with hyperparathyroidism. Large volumes of saline increase calcium excretion, potentially leading to low serum calcium levels.