Definition: Angiocardiography refers to an imaging procedure performed through a catheter, often inserted into the left upper lobe of the heart, using a needle or syringe. It allows for the visualization of the structures within the heart's lower layers—heart valves, chambers, and blood vessels—to diagnose conditions such as coronary artery disease, mitral valve prolapse, and more. The goal is to detect abnormalities in these regions that can lead to complications or blockages.