Final answer:
The nurse should assess the patient with acute pericarditis who has a pericardial friction rub first as this indicates inflammation in the tissues surrounding the heart and may require immediate medical intervention.
Step-by-step explanation:
The nurse should assess the patient with acute pericarditis who has a pericardial friction rub first. Acute pericarditis is a condition marked by chest pain, difficulty breathing, and a dry cough. The presence of a pericardial friction rub indicates inflammation in the tissues surrounding the heart and may require immediate medical intervention. The nurse should prioritize assessing this patient to evaluate the severity of the condition and provide appropriate treatment.