Correct Answer: A

Rationale: The correct answer is A: 'Decreased self-care in activities of daily living related to fatigue.' Patients with fibromyalgia commonly experience fatigue, which can lead to decreased ability to perform self-care activities. This nursing diagnosis addresses a direct consequence of fibromyalgia. Choices B, C, and D are incorrect because they do not directly correlate with the common manifestations of fibromyalgia. Impaired mental functioning related to electrolyte imbalances and increased vigilance secondary to electrolyte imbalances are not typical presentations of fibromyalgia. 'At risk for a swallowing disorder related to fibromyalgia' is not a common nursing diagnosis associated with fibromyalgia; swallowing disorders are not a primary symptom of this condition.

Correct Answer: D

Rationale: The correct answer is D, The Glasgow Scale. The Glasgow Coma Scale is specifically designed to assess a patient's level of consciousness by evaluating eye opening, verbal response, and motor response. Choices A, B, and C are incorrect because the Snellen Scale is used for vision testing, the Norton Scale is used for assessing the risk of pressure sores, and the Morse Scale is used for evaluating a patient's risk of falling, not for determining the level of consciousness.

Correct Answer: B

Rationale: The correct answer is to initiate cardiac monitoring. Severe hypokalemia can lead to life-threatening arrhythmias, making cardiac monitoring the priority to detect and manage any cardiac complications. Starting oxygen, seizure precautions, or bed rest are not the immediate priority actions for severe hypokalemia.

Correct Answer: A

Rationale: The correct answer is A: 135 to 145 milliequivalents per liter. The normal range for sodium levels in the body is expressed in milliequivalents per liter, not microequivalents. Choice B and D provide a significantly lower range which is not within the normal values for sodium. Choice C incorrectly states 'microequivalents' instead of the correct unit 'milliequivalents'. Therefore, A is the correct answer.

Correct Answer: A

Rationale: The correct principle of teaching to follow when reinforcing teaching and instructing the patient is to sequence the instruction from the least complex to the most complex. This approach facilitates learning by building upon simpler concepts before moving to more advanced ones. Choice B is incorrect because assuming the patient knows little or nothing about the topic may not always be accurate and can be patronizing. Choice C is incorrect as it does not focus on the direct teaching approach to the patient. Choice D is incorrect as using medically oriented terms may confuse the patient rather than facilitate understanding.