Which ear disorder is the result of injury from a sharp object, an explosion, a sudden change in air pressure, or severe middle ear infection?
A. Otosclerosis
B. Ruptured eardrum
C. Ménière's disease
D. Presbycusis
E. Labyrinthitis
B. Ruptured eardrum
The eardrum may become ruptured in several ways: by a sharp object, an explosion, a blow to the ear, a sudden change in air pressure, or a severe middle ear infection.
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Which statement(s) describe aspects of the Hering-Breuer reflex?
1. It affects the rate and depth of breathing during exercise. 2. It is only activated at large tidal volumes in normal adults. 3. Its impulses travel via the vagus nerve to the dorsal respiratory groups (DRGs). 4. Its receptors are located in the large and small airways. a. 1 only b. 1 and 2 only c. 2, 3, and 4 only d. 1, 2, 3, and 4
A patient receiving control-mode continuous mandatory ventilation has the following ABGs on an FiO2 of 0.4: pH = 7.51; PCO2 = 30 mm Hg; HCO3– = 25 mm Hg
Her current minute ventilation (VE) is 7.9 L/min. What new VE would you recommend? a. 9.0 L/min b. 6.7 L/min c. 7.5 L/min d. 5.9 L/min