What is a possible reason for being able to safely use higher mean airway pressures during HFV than during conventional ventilation?
A. because Taylor dispersion occurs during HFV and not during conventional ventilation
B. because the airway pressure swings are smaller during HFV
C. because of intraunit gas flow impedance differences occurring during HFV and lacking during conventional ventilation
D. because coaxial flow prevails during HFV and is absent during conventional ventilation
ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Observational trials with HFV often describe how high mean airway pressures are safely used, especially in comparison to those used for conventional ventilation. Sometimes mean airway pressures achieved during HFV are higher (>30 cm H2O) than the safe maximum pressure used during conventional ventilation. The safe use of these high pressures may be attributable to the small tidal pressure swings developing during HFV, and because the application of higher mean airway pressure with HFV may be a gradual process.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
You might also like to view...
A 42-year-old man has fallen 25 feet while rock climbing. He hit the ground feet first and suffered open fractures to both tibias, which are protruding through the skin. When you arrive, he is responding to painful stimuli. His airway is open, his breathing is adequate, and his radial pulse is strong and rapid. At this point in his care, it is a priority for you to:
a. cover him to help prevent shock. b. look for other injuries. c. obtain a medical history from his friends. d. immobilize the fractures.
Minimum screening test(s) that should be considered in the evaluation of abnormal bleeding is(are) which of the following?
a. Thrombin time b. Fibrinogen level c. Factor studies d. Platelet count, PT, APTT
The two types of history of present illness (HPI) are __________ and __________
Fill in the blank with correct word.
The first seven pairs of ribs, or true ribs, are attached directly to the sternum through pieces of cartilage called _______________ cartilage.
Fill in the blank(s) with the appropriate word(s).