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WorksheetsPre test physiology of one lung ventilation
Total questions: 10
Worksheet time: 10mins
Which of the following can increase pulmonary vascular resistance?
Septicemia
Systemic hypoxia
Positive end-expiratory pressure (PEEP)
All of the above
Which of the following statements is TRUE regarding changes seen when a patient is positioned in the lateral decubitus position?
Blood flow to the nondependent lung is significantly greater than it is to the dependent lung.
The distribution of blood flow is turned by 180 degrees compared with the supine position.
An awake, spontaneously breathing patient will demonstrate poor ventilation–perfusion matching in the dependent lung.
Ventilation in the dependent lung is greater than in the nondependent lung.
The nondependent hemidiaphragm is displaced higher into the chest.
A patient undergoing a right thoracotomy with one-lung ventilation is given vecuronium bromide and is placed in the left lateral
decubitus position. The following statements are true EXCEPT:
Thirty-five percent of the cardiac output participates in gas exchange in the left lung.
Hypoxic pulmonary vasoconstriction reduces blood flow to the nondependent hypoxic lung by 50%.
The patient's functional residual capacity (FRC) is reduced by receiving vecuronium bromide.
One-lung ventilation causes a right-to-left shunt through the nonventilated lung.
All of the following antagonize hypoxic pulmonary vasoconstriction EXCEPT:
Pulmonary hypertension secondary to pulmonary embolism
Epinephrine
Mitral stenosis
Infection
Propofol
Which of the following sympathomimetic drugs are β2 -selective and typically produce minimal cardiac effect from β1 -stimulation?
Albuterol
Terbutaline
Metaproterenol
Epinephrine
The right lung, in the upright position
is the smaller of the two
has a single fissure
has three lobes
receives 45% of total lung blood flow
is less frequently involved in aspiration
compared to the left
During awake, closed chest ventilation in the
lateral decubitus position
the lung relationships are the same as in
the semirecumbent position, i.e., the
apex is in zone 1 and the bases are in zone 3
ventilation is highest at the apex
perfusion is greater in the nondependent lung
compliance is unequal in the two lungs
the nondependent lung receives most of
the tidal ventilation
In surgical cases requiring lung isolation
Measurement of tracheal width from a posteroanterior chest radiograph is of no
use in selecting the size of a double-lumen tube (DLT)
More frequent use of left-sided DLT is based on the anatomy of
tracheobronchial tree
Uniform ventilation to all lobes is most likely achieved by a right-sided DLT
because it has a ventilation slot in the bronchial tube
Fiber–optic confirmation of correct DLT placement is not required if you have
good clinical confirmation
Which of the following statements is false regarding ventilation/perfusion
relationship in a lateral decubitus position during spontaneous ventilation ?
The ventilation /perfusion matching is preserved
Contraction of dependent hemidiaphragm is more efficient
Dependent lung is on a more favorable part of the compliance curve
The lower lung receives less ventilation and more perfusion than the upper lung
Which of the following statements is not true regarding lower lung syndrome?
It is caused by excessive fluid administration in a lateral decubitus position
It increases intrapulmonary shunting
It is gravity-dependent transudation of fluid in to the dependent lung
It is due to volutrauma caused during
one-lung ventilation
