A nurse is caring for a client who has a chest tube in place connected to a closed chest drainage system. Which of the following findings should indicate to the nurse that the client's lung has re-expanded?

Choice A reason: Administering oxygen therapy is the first and immediate intervention for a client with a pulmonary embolism to address hypoxemia.

Choice B reason: Starting an IV infusion of Lactated Ringer's is important for fluid resuscitation but is not the first intervention for pulmonary embolism.

Choice C reason: Initiating cardiac monitoring is important for observing the client's heart function but comes after ensuring the client is receiving adequate oxygen.

Choice D reason: Giving morphine IV may be used for pain management in pulmonary embolism but is not the first-line intervention.

Choice A reason: Hypermagnesemia, or high levels of magnesium in the blood, is not typically associated with refeeding syndrome. Instead, refeeding syndrome can lead to hypomagnesemia, which is a low level of magnesium in the blood, due to shifts of magnesium into the cells during insulin secretion in the refeeding process.

Choice B reason: Hyponatremia, or low levels of sodium in the blood, is not a hallmark of refeeding syndrome. While fluid shifts can affect sodium levels, the key electrolyte disturbances in refeeding syndrome involve phosphorus, potassium, and magnesium.

Choice C reason: Hyperkalemia, or high levels of potassium in the blood, is not a common finding in refeeding syndrome. Similar to magnesium, potassium can shift into cells during refeeding, which can actually lead to hypokalemia, or low levels of potassium in the blood.

Choice D reason: Hypophosphatemia, or low levels of phosphorus in the blood, is the hallmark of refeeding syndrome. When a malnourished individual is refed, insulin secretion is stimulated by the increased carbohydrate intake. Insulin promotes cellular uptake of glucose, which is accompanied by phosphate, potassium, and magnesium, leading to a decrease in the serum levels of these electrolytes. Phosphorus is critical for cellular processes, and its deficiency can lead to muscle weakness, respiratory failure, hemolysis, and impaired cardiac function. During refeeding, careful monitoring of electrolytes is essential to prevent and manage refeeding syndrome. Hypophosphatemia is the most significant laboratory finding to anticipate in a patient with refeeding syndrome, and it requires prompt recognition and treatment to prevent serious complications.