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Old 11-28-2012
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Default Dehydration :NBME 2 Concept

A 6-year-old boy with cystic fibrosis is
brought to the
physician by his mother because his skin has been cool
and clammy for 30
minutes. Earlier in the day, he had been playing
outdoors, and the
temperature was 99 F. When returning indoors, he was
thirsty and restless. His
blood pressure is 70/40 mm Hg, and pulse is 120/min.
Examination shows
dry mucous membranes. Serum sodium level is 128
mEq/L, and serum
chloride level is 87 mEq/L. Which of the following is
the most likely
explanation for these findings?

A) Excessive sweat electrolyte level

B) Excessive sweat volume

C) Excessive urinary output

D) Excessive vasopressor secretion

E) Inadequate sweat production

A or B
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Old 11-29-2012
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I think it's A
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Old 11-29-2012
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A) Excessive sweat electrolyte level

In CF secretions are dry so very small sweat volume but sweat electrolyte level is high.
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  #4  
Old 11-29-2012
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But isnt there excessive sweat secretion in CF and the question says that the boy was playing outdoors so why not B
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