The radiographic visualisation of blood vessels after the injection of radiopaque contrast agent.
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Angiography is used to diagnose:
Stenosis, occlusion and dilation.
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definition of stenosis
The abnormal narrowing of a blood vessel
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Definition of occlusion:
The blockage of a blood vessel.
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Definition of dilation.
The abnormal widening of a blood vessel.
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What is digital subtraction angiography?
Comparing a pre-contrast image to a post-contrast image and subtracting the common elements; to prevent boney detail from getting in the way of visualising blood vessels.
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What is roadmapping?
Software used to assist with passing catheters through blood vessels to avoid branches
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What is continuous fluoroscopy?
When the tube emits a continuous flow of x-rays, best image quality but has dose implications.
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What is pulsed fluoroscopy?
X-ray is emitted in a series of short pulses. more fps = more continuous image.
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Essential guidewire characteristics?
Pushability, Steerability, torque, opacity
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Pushability?
Amount of force needed to advance the guidewire
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Steerability?
Responsiveness of wire tip to navigate vessels
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Torque?
Responsiveness to turning, in order to navigate vessels
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