Coronary Angiogram Explained: Understanding Each Angiographic View and Labeled Vessels

 

Coronary Angiogram Explained – Understanding Each Angiographic View

Coronary angiography is the gold standard investigation to visualize coronary artery anatomy, detect stenosis, and guide interventional decisions. Correct interpretation depends on understanding standard angiographic views and knowing which coronary segments are best seen in each projection.

Basic Coronary Anatomy

Left Main Coronary Artery (LM) divides into the Left Anterior Descending (LAD) and Left Circumflex (LCX).

LAD gives diagonal branches and septal perforators.

LCX gives obtuse marginal branches.

Right Coronary Artery (RCA) gives conus, SA nodal, acute marginal branches and usually the PDA.

Left Coronary System Views

LAO Caudal View (Spider View)

Best for left main coronary artery, LM bifurcation, proximal LAD and proximal LCX. The LM resembles a spider body with LAD and LCX as legs. This is the most important view to assess left main disease and ostial LCX lesions.

RAO Caudal View

Best for LCX and obtuse marginal branches. LCX runs horizontally with good separation of OM branches. This view is ideal for evaluating LCX lesions and bifurcation disease.

RAO Cranial View

Best for mid and distal LAD and diagonal branches. LAD runs vertically with diagonals spreading laterally. Useful for identifying diagonal involvement and planning LAD bifurcation PCI.

LAO Cranial View

Best for proximal and mid LAD and septal branches. LAD appears elongated with good visualization of septals and diagonals. Commonly used during LAD interventions.

Right Coronary System Views

LAO View (RCA)

Best for proximal and mid RCA. RCA runs horizontally with clear visualization of acute marginal branches. Helpful for identifying ostial and proximal RCA lesions.

RAO View (RCA)

Best for distal RCA, PDA and posterolateral branches. RCA appears elongated and PDA runs vertically. Essential for determining coronary dominance and distal disease.

Important Concepts

Coronary Dominance

Right dominant circulation has PDA from RCA.

Left dominant circulation has PDA from LCX.

Co-dominant circulation has contribution from both.

Foreshortening and Overlap

No single view is sufficient. Cranial views elongate LAD. Caudal views open bifurcations. Multiple projections are required to avoid missing lesions.

Practical Learning Tips

Always identify the catheter first. Trace the vessel from ostium to distal end. Name branches sequentially. Correlate angiographic findings with ECG and echo.

Summary

LAO caudal shows left main and bifurcation.

RAO caudal shows LCX and obtuse marginals.

RAO cranial shows mid and distal LAD.

LAO cranial shows proximal LAD.

LAO RCA shows proximal RCA.

RAO RCA shows distal RCA and PDA.

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