Correct Answer: A

Rationale: The correct answer is A: First-degree AV block. A PR interval of 0.24 seconds indicates a prolonged PR interval, which is characteristic of first-degree AV block. This rhythm is considered benign and often does not require treatment. Choice B, premature ventricular contraction, is characterized by early, abnormal ventricular contractions and would not be indicated by the findings provided. Choice C, sinus bradycardia, would present with a normal PR interval but a heart rate less than 60 beats per minute. Choice D, atrial fibrillation, is characterized by an irregularly irregular rhythm with no identifiable P waves, which does not align with the findings of a prolonged PR interval in this scenario.

Correct Answer: B

Rationale: The correct answer is B. When updating protocols for the use of belt restraints, it is essential to document the client's condition every 15 minutes. This frequent documentation helps ensure the client's safety and allows for timely assessment of the need for continued restraint use. Choice A is incorrect because restraints should be removed and reassessed more frequently than every 4 hours. Choice C is incorrect as restraints should not be attached to the bed's side rails due to entrapment risks. Choice D is also incorrect as restraints should not be used as needed (PRN) but rather based on a specific prescription and assessment indicating the need for restraint use.

Correct Answer: C

Rationale: The correct action the nurse should take when caring for a client with a chest tube is to keep the drainage system below the level of the client's chest. This positioning helps prevent fluid from flowing back into the pleural space, ensuring proper drainage and effective functioning of the chest tube. Clamping the chest tube intermittently or stripping it frequently can lead to complications and should be avoided. Emptying the drainage collection chamber at specific intervals may vary based on institutional protocols, but it should be done when it is no more than two-thirds full to prevent backflow and maintain accurate monitoring of drainage output.

Correct Answer: B

Rationale: The correct answer is B: Administer sodium polystyrene sulfonate. Sodium polystyrene sulfonate is used to treat hyperkalemia by promoting the excretion of potassium. Choice A, administering sodium bicarbonate, is incorrect as it is not used to treat hyperkalemia. Choice C, administering calcium gluconate, is incorrect as it is used to treat hypocalcemia, not hyperkalemia. Choice D, administering calcium carbonate, is incorrect as it is used to treat conditions like osteoporosis and indigestion, not hyperkalemia.

Correct Answer: C

Rationale: The correct measure to include when caring for a client on contact precautions is to wear gloves when providing care. Gloves help prevent the spread of infection and cross-contamination. Choice A is incorrect because the protective gown should be removed before leaving the client's room to prevent the spread of pathogens. Choice B is incorrect as clients on contact precautions should be in a room with negative pressure to prevent the spread of airborne contaminants. Choice D is incorrect as wearing a mask when changing linens is not specifically required for contact precautions.