Correct Answer: A

Rationale: The correct answer is A, Sulfisoxazole (Gantrisin). Sulfisoxazole is known to potentiate hypoglycemia, making it unsafe for clients with a history of hypoglycemia. Choice B, Mexiletine, is a medication used to treat certain heart rhythm problems and is not associated with hypoglycemia. Choice C, Prednisone, is a corticosteroid and does not potentiate hypoglycemia. Choice D, Lithium carbonate, is commonly used to treat bipolar disorder and does not typically potentiate hypoglycemia. Therefore, the drug that Nurse Ruby should avoid in this case is Sulfisoxazole (Gantrisin) to prevent worsening the client's hypoglycemic condition.

Correct Answer: B

Rationale: Nasogastric suction can lead to significant potassium loss due to the continuous drainage of gastric contents, increasing the risk of a potassium deficit. Choices A, C, and D do not directly result in the significant loss of potassium. Renal failure may lead to potassium retention rather than a deficit. Addison's disease is associated with adrenal insufficiency, not potassium depletion. Potassium-sparing diuretics, as the name suggests, typically help retain potassium rather than cause a deficit.

Correct Answer: B

Rationale: The correct answer is to start an intravenous line and infuse normal saline. In diabetic ketoacidosis (DKA), the priority intervention is fluid resuscitation with normal saline to restore intravascular volume and improve perfusion. Administering insulin without first addressing dehydration and electrolyte imbalances can lead to further complications. Monitoring serum potassium levels and obtaining an arterial blood gas (ABG) are important aspects of DKA management but come after initial fluid resuscitation.

Correct Answer: C

Rationale: The correct answer is C. Clients with Addison's disease should not skip their medication, even if they feel well, as consistent medication is necessary to manage the condition. Choice A is correct as carrying an emergency kit with hydrocortisone is essential for managing potential adrenal crises. Choice B is correct as increasing sodium intake during hot weather helps prevent electrolyte imbalances. Choice D is correct as stress can trigger adrenal crisis in individuals with Addison's disease, so stress management is crucial.

Correct Answer: B

Rationale: Choice B is correct because nurses can develop effective leadership skills by actively engaging as good leaders and reflecting on their existing leadership qualities and areas for improvement. This process of self-assessment and continuous improvement is crucial in becoming a successful leader. Choice A is incorrect as leadership traits can be learned through experience and reflection rather than being impossible to acquire from a book. Choice C is incorrect as effective leadership involves focusing on long-term goals and strategies, not just daily activities. Choice D is incorrect because while seizing leadership opportunities is important, it should be done strategically and with a solid foundation of experience in nursing to ensure successful leadership outcomes.