Final answer:
The nurse should assess the patient with acute aortic regurgitation whose blood pressure is 86/54 mm Hg first.
Step-by-step explanation:
The nurse should assess the patient with acute aortic regurgitation whose blood pressure is 86/54 mm Hg first. Acute aortic regurgitation is a serious condition that requires immediate attention. The low blood pressure indicates that the patient may be experiencing hemodynamic instability, which could lead to organ damage or even death. Therefore, this patient should be assessed and treated as a priority.