Patients with acute severe asthma requiring mechanical ventilation are difficult to manage be-cause of which of the following?
a. Diaphragmatic paralysis
b. Increased lung compliance
c. Decreased airway resistance
d. Uneven alveolar hyperexpansion
ANS: D
Increased airway resistance from bronchospasm, increased secretions, and mucosal edema cause air trapping, which can cause uneven hyperexpansion of various lung units. This can cause rupture or compress other areas of the lungs leading to pneumothorax, pneumomediastinum, subcutane-ous emphysema, and other forms of barotrauma.
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A) Battalion chief B) Officer in charge C) Each firefighter D) None of the above
Serum urea nitrogen and serum creatinine determinations are frequently requested together so that their ratio may be evaluated
What is the range of the normal ratio of urea nitrogen to creatinine? A. 1/1 and 10/1 B. 12/1 and 20/1 C. 15/1 and 20/1 D. 20/1 and 30/1 E. 25/1 and 30/1