What are the indications?
Common indication is to assess blocked artery as a cause of acute pain in the arm. Sometimes it is performed as an introduction to interventional procedure (like embolization of the bleeding vessel in the arm or angioplasty/stenting of the narrowed artery.
Same as for general angiography
Is there any additional risk?
Extremely seldom manipulation of angiographic tube may damage the main artery, worsen the pain and even necessitate finger amputation. This complication is usually a consequence of pre-existing disease.
Otherwise depending on intervention. Please refer to embolization