what is a provocative angiography
Provocative angiography involves a full diagnostic angiogram followed by administration of intra-arterial procoagulant agents to identify an occult bleeding source in patients who have normal test results after lower gastrointestinal bleeding.
When the contrast dye is used to visualize veins, the study is called a venogram, and when it is used to visualize arteries, it is known as an arteriogram. In CT angiogram, the dye is always injected into a vein first and as the dye circulates from the veins into the arteries, images are obtained during both phases. CT angiography is considered less invasive than the traditional angiogram.