At the beginning of a digital subtraction angiography, an X-ray image without a contrast agent is taken. During and after the following contrast agent application, several further images are taken. The procedure is called digital subtraction angiography because the digitally taken images without a contrast agent are subtracted from the images depicting the vascular status with a contrast agent. This way elements of the images are removed that are not necessary for the evaluation or that would make it difficult to evaluate the images, for example, bones.
Indication angiography: when is angiography carried out?
Angiography takes place if vascular diseases seem to be the cause of complaints. During angiography, veins, arteries, lymph vessels or vascular prostheses can be examined. Examples for the indication of angiography are:
Course digital subtraction angiography
It is crucial to assess if the patients undergoing an angiography examination have a blood coagulation disorder / coagulopathy (blood test), an allergy to contrast agents, an illness making the performance of an angiography difficult or impossible, or if they take drugs manipulating the angiography.
At the end of the examination / treatment, the wound is sterilely covered. Subject to the examination / treatment, it can be necessary that patients do not stand up but lay low and stay one day for observation.