A client in the intensive care unit is on continuous renal replacement therapy (CRRT). Which finding requires immediate action by the nurse?

A. Potassium level 5.2 mEq/L: This potassium level is slightly above normal (3.5–5.0 mEq/L) but does not usually require immediate intervention unless trending upward or accompanied by ECG changes. CRRT can help gradually remove excess potassium, making this a lower-priority concern. B. Blood pressure 76/58 mm Hg: Hypotension is a serious complication in clients on CRRT because it can compromise perfusion to vital organs and indicate excessive fluid removal or bleeding. Immediate nursing action is required to assess, stabilize the client, and notify the healthcare provider to prevent shock or organ injury. C. Sodium level 135 mEq/L: This sodium level is at the lower end of normal (135–145 mEq/L) and does not typically require urgent intervention unless the client shows neurological symptoms or rapid shifts occur. Monitoring and gradual correction are usually sufficient. D. Pulse rate 90 beats/min: A pulse of 90 beats/min is within normal limits (60–100 bpm) and does not require immediate action. It should be documented and monitored as part of routine assessment, but it is not an urgent concern in this scenario.