Correct Answer: C

Rationale: Auscultating crackles in the lung bases indicates fluid in the lungs, which can be a sign of aspiration pneumonia or pulmonary edema and requires immediate intervention to prevent respiratory distress. Aspirating 100 mL of gastric residual is within the acceptable range and does not require immediate intervention. A gastric pH of 4 is normal for gastric contents. Checking residual every 6 hours is a routine nursing intervention and does not indicate an urgent issue like pulmonary complications.

Correct Answer: A

Rationale: The correct answer is A: Monitor INR. INR (International Normalized Ratio) is crucial for monitoring warfarin therapy as it helps assess the therapeutic effectiveness and bleeding risks associated with the medication. INR measures the clotting tendency of blood, which is essential in determining the appropriate dosage of warfarin. Monitoring platelet count (B), sodium levels (C), or calcium levels (D) is not primarily used for assessing warfarin therapy. Platelet count is more relevant in assessing bleeding disorders, while sodium and calcium levels are typically monitored for different medical conditions unrelated to warfarin therapy.

Correct Answer: A

Rationale: The correct answer is to administer epinephrine. Epinephrine is the first-line treatment for a severe allergic reaction as it helps to constrict blood vessels, increase heart rate, and open airways, thereby improving breathing and circulation. Discontinuing the medication may not be sufficient to manage a severe allergic reaction as the allergen is already in the patient's system. Corticosteroids and antihistamines can be considered as complementary treatments but are not the primary immediate intervention required for a severe allergic reaction.

Correct Answer: A

Rationale: The best position for a patient in respiratory distress is the Semi-Fowler's position. This position promotes lung expansion and eases breathing by allowing the chest to expand more fully. The Trendelenburg position (choice B) where the patient's feet are higher than the head is not recommended in respiratory distress as it may cause increased pressure on the chest and reduced lung expansion. The prone position (choice C) lying on the stomach is also not optimal for respiratory distress as it can further compromise breathing. The supine position (choice D) lying flat on the back is not ideal as it may impair breathing by restricting chest expansion.

Correct Answer: C

Rationale: Elevating the head of the bed to 45 degrees during feedings is the correct intervention to prevent aspiration in clients with a nasogastric tube. This position helps reduce the risk of regurgitation and subsequent aspiration of stomach contents into the lungs. Flushing the tube with water before feedings (Choice A) is not necessary for preventing aspiration. Checking for gastric residuals (Choice B) helps monitor feeding tolerance but does not directly prevent aspiration. Placing the client in the left lateral position (Choice D) is not specifically indicated for preventing aspiration in a client with a nasogastric tube.