32. Chest x-rays Flashcards

1
Q

What does the following show on a chest x-ray?

Black
Dark grey
Light grey
White
Bright white
A
Black - air
Dark grey - fat
Light grey - soft tissues
White - bone/fluid
Bright white - metal

LOOK AT THIS AND RECOGNISE FROM AN IMAGE

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2
Q

How do the anterior and posterior ribs appear on a chest x-ray?

A

The posterior ribs are the ones that are attached to the sternum
These then follow the lungs around towards the front and these (anteriorly) are the anterior ribs

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3
Q

Which rib dissects the diaphragm?

A

The seventh rib (check)

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4
Q

What are the first things you should look for on a chest x-ray?

A

Patient details i.e. name and DOB

Date/time of the CXR

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5
Q

What is the difference between a PA and AP chest x-ray and why might each be used?

A

PA - this is the most common CXR
This is preferred
Can accurately comment on the size of the heart
Ask the patient to hug a block and the clavicles and the sternum are moved out of the way and do not obscure the x-ray

AP - This will be used for a patient who may be bed-bound in hospital and cannot stand up for a PA view
The heart appears larger in this
The scapular is visible over the lung field
The clavicles are horizontal and are not moved out of the way

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6
Q

How can you recognise a PA x-ray from an AP x-ray?

A

NB. look at the label !!
OR
See if the scapula is present over the lung fields
See if the clavicles are present horizontally

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7
Q

Give a pneumonic of things to look for in a chest x-ray

A
Airways
Breathing
Circulation
Diaphragm
Everything else
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8
Q

What should you look for on a CXR regarding the airways?

A

Trachea - is it deviated? (Will be pulled to the same side of a collapsed lung and pushed to the opposite side in a pneumothorax)
Left and right main bronchi - is the lumen clear?
Are there any masses present?
Any reduced lung volume?
Any consolidation?

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9
Q

What should you look for on a CXR regarding breathing?

A

Compare the lung zones on both sides - upper, middle and lower
See any pleural effusion? Consolidation? - small airways will fill with dense white material

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10
Q

How can a pneumothorax be recognised in a chest x-ray?

A

Asymmetrical zones of the lung

There is a lack of lung markings to the edge of the lung field

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11
Q

How can a pleural effusion be recognised on a chest x-ray?

A

This is a collection of fluid in the pleural space
Fluid gathers in the lowest part of the chest (according to the patient’s position)
Will appear white (fluid)
There will be a meniscus at the top
GOOD IMAGE ON SLIDE 31

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12
Q

What should you look for on a CXR regarding circulation?

A

Cardiothoracic ratio (length of the lungs to the lenght of the heart) - 50% is considered normal
Mediastinum - the aortic knuckle should be present, should not be widened
Heart contours should be visible

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13
Q

What should you look for on a CXR regarding the diaphragm?

A

Should be dome shaped
The right hand side should be higher than the left hand side - to the top of the 5th intercostal space compared to the bottom of the 5th intercostal space
Have a look - is there any air under the diaphragm?

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14
Q

What is under the diaphragm on the left and right hand side respectively?

A

Left hand side - bowel

Right hand side - liver

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15
Q

What should you look for on a CXR regarding ‘everything else’?

A

Bones - are there any fractures?
Soft tissues - are there any swellings? any breast shadows?
Lines - ECG, endotracheal tubes, pacemakers, chest drains

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16
Q

What will you see on a CXR in COPD?

A

Hyperinflation - due to trapping of air in the bullae
Can tell this if you can see more than 6 anterior/8 posterior ribs before the diaphragm
A flattening of the hemidiaphragm - will not be at the 6th intercostal space in this case but will be located LOWER

17
Q

What can you see on a CXR in congestive heart failure?

A
A - alveolar oedema
B - kerley B lines
C - cardiomegaly (boot shaped)
D - upper lobe diversions
E - bilateral effusions