Correct Answer: A

Rationale: The correct instruction the nurse should include to improve oxygenation for a client with COPD is to 'Use pursed-lip breathing during activities.' Pursed-lip breathing helps improve oxygenation by slowing down the respiratory rate, reducing the work of breathing, and keeping the airways open. This technique also helps prevent the collapse of small airways during exhalation, allowing for more complete emptying of the lungs. Choices B, C, and D are incorrect because deep breathing exercises after meals, diaphragmatic breathing during exercise, and breathing in short, shallow breaths do not specifically target the improvement of oxygenation in individuals with COPD.

Correct Answer: B

Rationale: Increased heart rate is a common sign of fluid volume deficit (FVD) as the body compensates for decreased fluid levels. When a client is experiencing FVD, the body tries to maintain perfusion to vital organs by increasing the heart rate. This compensatory mechanism helps to improve cardiac output and maintain blood pressure. Choices A, C, and D are incorrect because in FVD, hematocrit may be increased due to hemoconcentration, blood pressure tends to decrease as a compensatory response to FVD, and respiratory rate is usually unaffected or may increase due to attempts to maintain oxygenation.

Correct Answer: B

Rationale: The correct answer is B. Wearing slippers or shoes at all times when out of bed is crucial for clients with diabetes mellitus to protect their feet from injury. Option A is incorrect as soaking feet in warm water can lead to dry skin, making it more susceptible to injuries. Option C is incorrect as applying lotion between the toes can create a moist environment, increasing the risk of fungal infections. Option D is incorrect as cutting toenails straight across is a good practice but is not directly related to preventing foot injuries in clients with diabetes.

Correct Answer: B

Rationale: The correct instruction for a client with home oxygen therapy is to keep oxygen tubing away from heat sources to prevent fires and other hazards. Option A is incorrect because adjusting the oxygen flow rate without healthcare provider guidance can be dangerous. Option C is incorrect as synthetic fabrics can generate static electricity, which is a fire hazard. Option D is incorrect as oxygen should be left on as prescribed unless advised otherwise.

Correct Answer: B

Rationale: Verifying tube placement is the crucial initial step a nurse should take before administering enteral feedings through an NG tube. This step ensures that the tube is correctly positioned in the stomach, reducing the risk of complications such as aspiration. Measuring residual gastric volume, flushing the tube with water, or administering the feeding in small boluses are all important steps in enteral feeding but should only be done after confirming the correct tube placement.