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ACE inhibitors can cause hyperkalemia (B) as a side effect due to their effect on potassium retention. The nurse should monitor potassium levels closely in patients receiving ACE inhibitors. Hypokalemia (A) is more commonly associated with diuretics. Hypertension (C) and tachycardia (D) are not typical side effects of ACE inhibitors.

Long-acting beta-agonists (LABAs) can cause hypokalemia as a side effect due to their action on potassium levels in the body. It is crucial to assess the patient for signs of hypokalemia, such as muscle cramps or weakness. While using a spacer (D) is helpful, monitoring for hypokalemia (A) is a key nursing consideration due to the potential side effects of LABAs.

The sample size and diversity (B) are critical factors in determining if the study’s results are applicable to the nurse’s patient population. A diverse sample ensures that the findings are generalizable to a broad group of patients. While statistical significance (A), publication date (C), and funding sources (D) are important, they do not outweigh the relevance of the study sample.

The nurse should respect the patient’s decision (B) to refuse treatment and support them in their choice, while ensuring they are fully informed about the potential consequences. Convincing the patient (A) or administering treatment without consent (C) would violate the patient’s autonomy. Involving the family (D) may be appropriate but should not replace respecting the patient’s wishes.

In acute renal failure, the kidneys are unable to filter waste products effectively, leading to elevated levels of blood urea nitrogen (BUN) and creatinine. Serum potassium (C) levels are often elevated due to impaired renal excretion. High hemoglobin and hematocrit (D) are not typically associated with renal failure, and low BUN and creatinine (A) would not be expected.