A nurse is assisting with the care of a school-age child who has respiratory failure due to pneumonia. Which of the following positions should the nurse encourage to allow maximal lung expansion?

Choice A reason: Planning to administer insulin to the client is not a relevant action for the nurse to take, as it has no effect on respiratory alkalosis or hyperventilation. Insulin is used to lower blood glucose levels in patients with diabetes or hyperglycemia.

Choice B reason: Having the client breathe into a paper bag is a correct action for the nurse to take, as it helps to increase the carbon dioxide level in the blood and correct the alkalosis. Breathing into a paper bag creates a closed system that recycles the exhaled carbon dioxide and reduces the loss of carbon dioxide from the lungs.

Choice C reason: Planning to administer sodium bicarbonate to the client is not a correct action for the nurse to take, as it can worsen the alkalosis. Sodium bicarbonate is an alkali that can raise the pH of the blood and cause metabolic alkalosis. It is used to treat metabolic acidosis, not respiratory alkalosis.

Choice D reason: Having the client place their head between their knees is not a recommended action for the nurse to take, as it can impair the blood flow to the brain and cause fainting. It can also increase the respiratory rate and decrease the carbon dioxide level in the blood.

Choice A reason: Flank pain is not a sign of an allergic transfusion reaction. Flank pain is a pain in the side of the abdomen or back, usually caused by kidney problems, such as infection, stones, or injury. Flank pain can be a sign of a hemolytic transfusion reaction, which is a serious complication that occurs when the donor blood is incompatible with the recipient's blood type.

Choice B reason: Elevated blood pressure is not a sign of an allergic transfusion reaction. Elevated blood pressure is a condition where the force of the blood against the artery walls is too high, which can increase the risk of heart disease, stroke, and kidney damage. Elevated blood pressure can be a sign of a hypertensive transfusion reaction, which is a rare complication that occurs when the donor blood has a higher sodium level than the recipient's blood.

Choice C reason: Distended neck veins are not a sign of an allergic transfusion reaction. Distended neck veins are a sign of increased pressure in the right side of the heart or the superior vena cava, which can be caused by heart failure, pulmonary hypertension, or obstruction. Distended neck veins can be a sign of a circulatory overload transfusion reaction, which is a complication that occurs when the blood volume or rate of infusion is too high for the recipient's cardiovascular system.

Choice D reason: Wheezing is a sign of an allergic transfusion reaction. Wheezing is a high-pitched whistling sound that occurs when the airways are narrowed or inflamed, which can cause difficulty breathing, coughing, or chest tightness. Wheezing can be a sign of an allergic transfusion reaction, which is a hypersensitivity response to the donor blood or its components, such as plasma proteins, antibodies, or preservatives. An allergic transfusion reaction can range from mild to severe, and can be treated with antihistamines, corticosteroids, or epinephrine.