Digital-subtraction angiography is the computer-assisted radiographic visualization of the neck and brain arteries and veins.
It is used to diagnose diseases like a brain aneurysm, arteriovenous malformation or an AVM, dural arteriovanous fistula, carotid cavernous fistula, blockagae or narrowing of brain or neck arteries.occlusion, or stenosis.
It is considered as the gold standard for not only diagnosis but also for assesing the blodd flow and morphology of arteries of the brain.
With selective injections of dye into the intracranial arteries through brain-specific tubes called catheters, microcatheters,
it is used to treat not only treat aneurysms with miniature devices called coils and latest is flow diverter, AVM by liquid embolic agents.
Neurovascular cath lab modalities have most almost dramatic results, the stroke or brain attack is treated as is a heart attack. The blocked artery is opened with miniature minute devices and suction and stents.
Digital subtraction angiography is considered necessary only if preoperative embolization is being considered, but it is an invasive diagnostic procedure with certain well known inherent risks
During Digital subtraction angiography the patient has to be lying in a supine, position.
Diagnostic DSA is usually done without the anesthesia or sedation and patient is fully conscience without any significant pain or discomfort. The procedure can usually last for 20-30 minutes, the therapeutic procedure in the neurovascular cath lab is done in general anesthesia and with complete neuromonitoring for the safety of the patient.