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Review Question - QID 109581

QID 109581 (Type "109581" in App Search)
A 73-year-old man is brought in by ambulance after he was found to be lethargic and confused. He has not been routinely seeing a physician and is unable to recall how he came to be in the hospital. His temperature is 99°F (37°C), blood pressure is 150/95 mmHg, pulse is 75/min, and respirations are 18/min. His past medical history is significant for poorly controlled diabetes and longstanding hypertension, and he says that he has not been taking his medications recently. Labs are obtained and shown below:

Serum:
Na+: 142 mEq/L
Cl-: 105 mEq/L
K+: 5 mEq/L
HCO3-: 16 mEq/L
Urea nitrogen: 51 mg/dL
Glucose: 224 mg/dL
Creatinine: 2.6 mg/dL

Which of the following changes would most likely improve the abnormal parameter that is responsible for this patient's symptoms?