Cardio 19-39 - ben

[ArchivalUser]

A 70-year-old male is brought to the ER, by his wife, because he lost consciousness while getting up in the morning. The syncopal episode lasted for several minutes, and the patient rapidly recovered consciousness. He had mild diarrhea and a decreased appetite one day earlier, which resolved spontaneously. His past medical history is significant of hypertension that is effectively controlled with the combination of hydrochlorothiazide/amiloride. His blood pressure is 120/70 mm Hg, while supine, and 98/50 mm Hg, while standing. The physical examination revealed a mild, mucosal dryness. The EKG is normal. Which of the following laboratory values is the most sensitive indicator of the patient's underlying condition?


A. Decreased sodium concentration in the urine
B. Hypokalemia
C. Increased BUN/creatinine ratio
D. Metabolic acidosis
E. Decreased hemotocrit

[ArchivalUser]

cc

[ArchivalUser]

this patient has dehydration and hypovolemia.
His renal perfusion will be low, pre-renal. bun/cr will be >20, so ans is C.

[ArchivalUser]

c...........