Posted: July 24th, 2017

A 74-year-old man has had confusion for 2 weeks. He has smoked two packs of cigarettes daily for 50 years. An x-ray of the chest shows a 5-cm mass in the lung. Laboratory studies of serum show:

A 74-year-old man has had confusion for 2
weeks. He has smoked two packs of cigarettes
daily for 50 years. An x-ray of the chest shows a
5-cm mass in the lung. Laboratory studies of
serum show:
Na+
110 mEq/L
Cl−
72 mEq/L
K
+
4.5 mEq/L
HCO3
−
30 mEq/L
Glucose 200 mg/dL
Creatinine 1.4 mg/dL