A client with a history of hypertension is admitted with acute renal failure. Which assessment finding requires immediate intervention?
Correct Answer: B
Rationale: Urine output of 50 mL in 4 hours indicates oliguria, which can be a sign of worsening renal function and requires immediate intervention. In acute renal failure, maintaining adequate urine output is crucial to prevent further kidney damage and manage fluid balance. A high blood pressure reading (Option A) is concerning but may not require immediate intervention in this scenario as it could be due to the history of hypertension. A heart rate of 100 beats per minute (Option C) is slightly elevated but may not be the most critical finding at this moment. Nausea and vomiting (Option D) are important to assess but are not as urgent as addressing oliguria in a client with acute renal failure.