During volume ventilation, peak inspiratory pressure is the pressure needed to overcome which two of the following factors? 1. Muscle pressure 2. Airflow resistance 3. Elastic recoil pressure 4. Transthoracic pressure
a. 1 and 2 c. 3 and 4
b. 1 and 3 d. 2 and 3
ANS: A
During volume ventilation, pressure increases as the volume is being delivered. The pressure at the end of inspiration, or peak inspiratory pressure, represents the pressure needed to overcome both airflow resistance and the elastic recoil pressure of the lungs and thorax. This concept is demonstrated in the equation of motion: Muscle pressure + Ventilator pressure = Elastic recoil pressure + Flow resistance pressure. Muscle pressure is the pressure generated by a person's mus-cles of ventilation to overcome elastic recoil pressure and airflow resistance. Transthoracic pres-sure is a pressure gradient between the pleural space and the body surface. During spontaneous breathing, it is the total pressure needed to expand or contract the lungs and chest wall together.
You might also like to view...
Injuries to the head that result in the stretching, tearing, and disruption of the CNS are called:
A) subdural hematomas. B) cerebral contusion. C) diffuse axonal injuries. D) basilar skull fractures.
When is a sealant contraindicated?
A) When there is incipient caries on the occlusal surfaces B) When there is a presence of a large occlusal restoration C) When there is dark staining in the pits and fissure D) When there is a high caries rate
The initial phase of wound healing, in which bleeding is reduced as blood vessels in the affected area constrict, is the ________ phase.
Fill in the blank(s) with the appropriate word(s).
Which of the following indicates how a user can reactive a completed item on the ToDo List ?
A. Adding the item again as a new item B. Clicking on the red check box before logging off reactivates the task C. Once an item is completed, it cannot be reverted back to active. D. None of these.