Correct Answer: A

Rationale: The term 'fidelity' specifically refers to the agreement to keep promises. Fidelity in healthcare ethics emphasizes the importance of healthcare professionals keeping their commitments to patients. Choice B, 'Non-maleficence,' relates to the ethical principle of doing no harm. Choice C, 'Autonomy,' refers to respecting a patient's right to make decisions about their own healthcare. Choice D, 'Justice,' pertains to fairness and equality in the distribution of healthcare resources.

Correct Answer: D

Rationale: In managing hyperkalemia, it is essential to administer insulin and glucose to shift potassium into the cells, restrict potassium intake to prevent further elevation of serum levels, and monitor the ECG for signs of potassium-induced cardiac effects. Therefore, the correct answer is D, as all of the provided actions are important in the management of hyperkalemia. Choice A alone is not sufficient as it only addresses shifting potassium intracellularly without preventing further elevation. Choice B alone is not enough as it does not address the immediate need to lower serum potassium levels. Choice C alone is insufficient as it only monitors for cardiac effects without addressing potassium levels or shifting mechanisms.

Correct Answer: A

Rationale: The correct answer is A: Fine crackles. Fine crackles suggest fluid in the lungs, which could indicate a serious respiratory issue like pulmonary edema. This sound should be reported to the provider for further evaluation and possible intervention. Rhonchi (choice B) are low-pitched wheezing sounds often caused by secretions in the larger airways, wheezing (choice C) is a high-pitched whistling sound usually caused by narrowed airways, and stridor (choice D) is a high-pitched sound heard on inspiration that indicates upper airway obstruction. While these sounds also require attention, fine crackles are more indicative of fluid accumulation in the lungs, making them the priority for reporting in this scenario.

Correct Answer: A

Rationale: Administering oxygen and seeking emergency help are crucial initial steps in managing a patient with suspected myocardial infarction (MI). Oxygen helps to improve oxygenation to the heart muscle, reducing its workload and preventing further damage. Calling for emergency help ensures timely access to advanced medical care, including interventions like thrombolytics. Monitoring vital signs and providing pain relief are important but secondary to the immediate need for oxygen and emergency assistance. Providing nitroglycerin and thrombolytics should be done under medical supervision and following appropriate protocols, not as the first step. Administering diuretics and altering the patient's diet are not indicated in the acute management of MI.

Correct Answer: C

Rationale: The correct solution to maintain fluid and electrolyte balance during NG tube irrigation is 0.9% sodium chloride. This solution is isotonic and helps prevent electrolyte imbalances. Using tap water or sterile water can lead to electrolyte disturbances due to their hypotonic nature, while 0.45% sodium chloride is hypotonic and may cause further imbalances in the client's electrolyte levels.