The nurse is preparing to administer a feeding to a client with a gastrostomy tube. What should the nurse do before providing this feeding?

D. Metabolic alkalosis is characterized by an increased pH (alkalosis) and an increased HCO3. In this case, the pH is elevated (7.5), indicating alkalosis, which supports metabolic alkalosis. The HCO3 is elevated at 40 mEq/L, which further supports metabolic alkalosis. The PaCO2 is normal or slightly low (36 mmHg), which can occur as a compensatory response to metabolic alkalosis.

A. Respiratory alkalosis is characterized by an increase in pH (alkalosis) and a decrease in PaCO2 (hypocapnia). In this scenario, the pH is elevated (7.5), which indicates alkalosis. The PaCO2 is 36 mmHg, which is within the normal range (35-45 mmHg) but slightly on the lower side (slight hypocapnia). The HCO3 is elevated at 40 mEq/L, which suggests a compensatory response by the kidneys to retain bicarbonate to counteract the alkalosis.

B. Respiratory acidosis is characterized by a decrease in pH (acidosis) and an increase in PaCO2 (hypercapnia). In this case, the pH is elevated (7.5), indicating alkalosis, which contradicts respiratory acidosis. The PaCO2 is 36 mmHg, which is normal or slightly low, not high as expected in respiratory acidosis. The elevated HCO3 (40 mEq/L) suggests a compensatory metabolic response to the alkalosis, not to acidosis.

C. Metabolic acidosis is characterized by a decreased pH (acidosis) and a decreased HCO3. In this scenario, the pH is elevated (7.5), indicating alkalosis, which contradicts metabolic acidosis. The HCO3 is elevated at 40 mEq/L, indicating metabolic alkalosis rather than metabolic acidosis.

C. Before administering a feeding through a gastrostomy tube, it is essential to verify that the tube is patent (open and unobstructed). Tube patency ensures that the feeding formula or medication can flow freely into the stomach or intestines without encountering any blockages or resistance. The nurse should flush the tube with water to check for patency and ensure proper functioning before initiating the feeding.

A. Vital signs are typically assessed for overall health monitoring and to detect any immediate changes in the client's condition. However, they are not specifically required before every feeding via gastrostomy tube unless there are specific concerns about the client's stability.

B. This option is not typically necessary before administering a feeding through a gastrostomy tube. In fact, elevating the head of the bed to at least 30 to 45 degrees is often recommended during and after feeding to minimize the risk of aspiration. This position helps to promote digestion and reduce the likelihood of reflux or regurgitation of the feeding.

D. Assisting the client to a prone (face-down) position is unnecessary and potentially unsafe before administering a feeding through a gastrostomy tube. The recommended position for feeding via gastrostomy tube is typically semi-Fowler's position (elevated head of the bed), which helps prevent aspiration and facilitates digestion.