An older client is admitted to the intensive care unit unconscious after several days of vomiting and diarrhea. Vital Signs Heart Rate-beats/minute- 110 Respirations - breathes/minute- 28 Blood Pressure – mmHG- 80/60 Arterial blood gases (ABGs) Ph- 7.34 PaCO2- 34 mmHg HCO3- 20 mmol/L pO2- 90 mmHg Electrolytes Results Sodium 130 mEq/L(mmol/L) Potassium 2.5 mEq/L (mmol/L) Chloride 95 mEq/L (mmol/L) Reference Range: Sodium [136 to 145 mEq/L (136 to 145 mmol/L)] Potassium [3.5 to 5 mEq/L (3.5 to 5 mmol/L)] Chloride [98 to 106 mEq/L (98 to 106 mmol/L)] PaCO2 [35 to 45 mm Hg] HCO, [21 to 28 mEq/L (21 to 28 mmol/L)] PaO2 [80 to 100 mm Hg) The nurse inserts a urinary catheter and obtains a scant amount of dark amber output. Which intervention should the nurse implement first? (Please scroll and view each tab's information in the client's medical record before selecting the answer.)