Correct Answer: A

Rationale: The correct answer is A. Systolic heart failure is characterized by reduced ejection fraction, meaning the heart is not pumping effectively. Diastolic heart failure, on the other hand, is characterized by preserved ejection fraction, indicating that the heart has difficulty relaxing and filling properly. Choices B, C, and D are incorrect because they do not accurately describe the key differences between systolic and diastolic heart failure.

Correct Answer: D

Rationale: The correct answer is D because it accurately transcribes the prescription by specifying the medication (Potassium chloride), the dose (20 mEq), the route (PO for by mouth), and the frequency (every morning). Choice A is incorrect as it specifies a lower dose compared to the correct prescription. Choice B is incorrect due to an inaccurate dose. Choice C is incorrect as it lacks specificity regarding the type of potassium prescribed and the dose.

Correct Answer: D

Rationale: The correct intervention for a client with dementia at risk of falling is to use a bed exit alarm to notify staff of attempts to leave the bed. This intervention helps in preventing falls by alerting the staff when the client tries to get out of bed. Keeping the bed in the lowest position (Choice A) may not prevent falls and could make it challenging for staff to provide care. Raising all four side rails (Choice B) can be a restraint and is not recommended as it may lead to entrapment or other risks. Assisting with ambulation every 2 hours (Choice C) may not be feasible or effective in preventing falls, as the client may attempt to get out of bed at any time.

Correct Answer: C

Rationale: The correct intervention for a client experiencing chronic pain is to teach relaxation techniques, as it helps in managing pain more effectively by reducing stress and anxiety. Distractions like television (Choice A) may offer temporary relief but do not address the root cause of chronic pain. Administering pain medication around the clock (Choice B) may lead to dependency and not promote long-term pain management. While massage therapy (Choice D) can be beneficial, teaching relaxation techniques (Choice C) is more directly focused on empowering the client to manage their pain independently.

Correct Answer: B

Rationale: The correct safety measure that the nurse should emphasize is to keep oxygen tanks upright and away from heat sources. This is crucial to prevent the risk of fire or explosion. Choice A is incorrect as smoking near oxygen can lead to a fire hazard. Choice C is also incorrect as storing oxygen tanks in enclosed spaces can be dangerous. Choice D, although related to safety, does not address the immediate risk of keeping oxygen tanks away from heat sources.