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RCP160 Midterm Quiz - Qs & As -100% Accurate
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RCP160 Midterm Quiz - Qs & As -100% Accurate_________________ means that _____________________ absorbs xrays the least and
results in a ________________ shadow ✔️Ans - -radiolucent
-air (such as in the lungs)
-dark
_________________ means that _____________________ absorbs most xray energy and
results in a ________________ shadow ✔️Ans - -radiopaque
-bone (such as the ribs)
-white
Fat and water shadows are ✔️Ans - different degrees of gray on a CXR
This xray film is taken with a portable xray machine in ICU, with the x ray
source in front of the pt, and the film behind them ✔️Ans - Anterior
Posterior (AP) film
The quality of AP film is ✔️Ans - not as good as PA film
In an AP xray, the heart shadow is ✔️Ans - more magnified as the heart is
closer to the x ray source and farther from the film
In AP film, ____________ of the patient is more likely ✔️Ans - rotation
One of the most common problems in a AP chest film is that the ✔️Ans - pt
is not being centered on film
This xray film is done in the radiology department with the pt standing with
the film placed against the pt's Chest ✔️Ans - Posterior Anterior (PA) film
in a PA projection, the diameter of the heart should not exceed
___________________________ of the chest ✔️Ans - half of the diameter
PA CXR film results in ✔️Ans - in high quality film with minimal
magnification of the heart shadow
,When looking at the air, airways, and apices in a CXR (2 things) ✔️Ans - -air
should be dark
-make sure the trachea is midline
When looking at the bones in a CXR, this is important ✔️Ans - symmetry
When looking at the diaphragm in a CXR (3 things) ✔️Ans - -the right
hemidiaphragm should be higher than the left
-there should be no free air under
-diaphragm should be curved
blunted costophrenic angles on a CXR indicate ✔️Ans - pleural effusion is
present
about _______________________ will blunt a costophrenic angle ✔️Ans - >175 ml
of pleural fluid
the best CXR view for detecting small pleural effusions ✔️Ans - lateral
decubitus
the tip of the endotracheal tube should be ✔️Ans - 3-7cm above the carina
with the pt's head in
the neutral position
tracheostomy tubes should extend ✔️Ans - half distance from stoma to
carina
the tip of CVP catheter should be in ✔️Ans - the superior vena cava
We do AP chest x rays in the ICU at ____________________, while PA CXRs are done
when ______________________________________________. Finally we use lateral
decubitus CXRs __________________________ ✔️Ans - -bedside when the pt is too
ill to travel and stand
-the pt can travel to and stand at the radiology department
-to detect for small pleural effusions
we perform ultrasound to evaluate the __________________________ and to aid in
______________________________ ✔️Ans - -heart (via echocardiography) and
pleural fluid more closely
, -aid in thoracentesis
MRIs can't be used in ______________________, additionally ________________________
can't be used near the MRI machine ✔️Ans - -pts with pacemakers
-gas cylinders and average ICU vents
Improper xray penetration may ✔️Ans - conceal structures and important
details
proper xray penetration shows ✔️Ans - intervertebral disc spaces through
shadow of heart
Overpenetrated xray films leave ✔️Ans - lung parenchyma black without
vascular markings
underpenetrated causes the lung shadows to ✔️Ans - be too white with
increases in chest whiteness
Work of breathing equation and what it describes ✔️Ans - -W = P x V
-describes the work that has to be done to move gas into the lungs and thorax
Define compliance ✔️Ans - The ease with which an object can be distorted
(inflated)
How is static compliance calculated (2 things) ✔️Ans - -Vt / Plat - PEEP
-can also be Vt / Plat - Total PEEP, where PEEPtot = auto-PEEP + Set PEEP
Normal compliance ✔️Ans - 60-100 mL/cmH2O or 80-100
the amount of pressure need to keep a gas moving at a constant speed. Or the
frictional opposition to gas movement ✔️Ans - Airway Resistance
What diseases would reduce chest wall compliances (4 things) ✔️Ans - -
thoracic deformity
-abdominal expansion
-circumferential chest burns
-pneumo- or hemothorax
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