In which of the following clinical settings would hypokalemia be a significant problem?
a. During weaning from mechanical ventila-tion
b. In a patient with pleural effusion
c. In a patient with kyphoscoliosis
d. During a bronchial challenge test
ANS: A
The potassium level is of particular interest in the patient being weaned from mechanical ventila-tion, because both hyperkalemia and hypokalemia may render the diaphragm weak and less ef-fective.
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