1. A 65-year-old patient presents with a pH of 7.25, PaCO2 of 50 mmHg, and HCO3- of 22 mEq/L. What is the most likely diagnosis? A. Metabolic acidosis B. Metabolic alkalosis C. Respiratory acidosis D. Respiratory alkalosis Correct Answer: C. Respiratory acidosis Rationale: The low pH indicates acidemia, and the elevated PaCO2 suggests that the acidosis is respiratory in nature, not metabolic. 2. A patient is admitted with systolic blood pressure consistently below 90 mm Hg. Which of the following interventions should be prioritized? A. Administration of IV fluids B. Immediate initiation of vasopressors C. Application of supplemental oxygen D. Elevation of the patient's legs Correct Answer: A. Administration of I