NHLBI Coronary Artery Dissection Type B

**Semantic type:** Qualitative Concept

**Definition:** Parallel tracts or double lumen separated by a radiolucent area during contrast injection with no persistence after dye clearance. (Adapted from: Coronary artery angiographic changes after PTCA: Manual of Operations NHLBI PTCA Registry 1985-6:9)

**Synonyms:** - CORONARY DISSECTION NHLBI GRADE B