Aniography

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Posted on 30th May 2011 by admin in Uncategorized

Angiography is an imaging technique used on blood vessels.  A contrast material is routinely injected via an intraluminally placed catheter.  This imaging technique is slightly invasive.  There are less invasive ways to visualize blood vessels in the allied health field, but this is one method that is used.

A diagnostic percutaneous anteriography uses the Sledinger technique of vascular catheterization.  This technique requires a hollow core needle to be placed into either a femoral or brachial artery.  A guidewire is then inserted through the needle and into the artery.  Usually sonographic or fluoroscopic guidance is used to ensure that the guidewire is positioned correctly.  Once the wire is in place, the needle is removed and exchanged for a vascular catheter or vascular introducing sheath.  Different sized catheters can be used for different sized arteries and blood vessels.

Once the catheter is in position the guidewire is removed and a contrast agent is injected into the catheter.  Images are taken before the injection and while the contrast agent flow through the lumen of the blood vessel that is producing the arteriogram.  When the procedure is completed the catheter is removed and manual compressions or a percutaneous closure device can be used to ensure that hemostasis is obtained at the injection site.  It will usually take anywhere from 2 to 6 hours for a patient to recover from this procedure.

Noninvasive angiographies are beginning to replace the conventional invasive technique.  The noninvasive technique is more commonly used except where intervention is expected or there are indefinite results from other examinations.  Computed tomography angiography (CTA) and magnetic resonance angiography (MRA) are the two noninvasive techniques that are being more widely used.  Both are effective at evaluating aortic, visceral, renal, and peripheral arterial disease.

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