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Left Circumflex (LCX) Artery

A Cath Lab Anatomy & Hemodynamics term on the RCIS exam blueprint, defined for cath lab and EP clinicians.

Curves posteriorly along the left atrioventricular groove, giving off obtuse marginal (OM) branches that supply the lateral and posterolateral walls of the left ventricle.

Anterior view of the heart with the left circumflex artery highlighted on the image’s right, curving posteriorly along the left atrioventricular groove and giving off obtuse marginal branches that supply the lateral and posterolateral left ventricular walls.
The circumflex in the left AV groove and its obtuse marginal branches.

Domain: Cath Lab Anatomy & Hemodynamics · Blueprint: RCIS exam guide

Related RCIS terms

Atrioventricular (AV) Node Bundle Branches Left Anterior Descending (LAD) Artery Left Main Coronary Artery (LMCA) Posterior Descending Artery (PDA)

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Written and reviewed by John-Philip (JP) Maarschalk, BSN, RN, CNML — a nurse manager who runs operations for the cardiac cath lab, electrophysiology, and interventional service lines at an academic health system in North Carolina. He hires and develops the staff who sit for these exams. More about JP and how this content is made →
Cardiac Codex is an independent study tool published by MdoubleA LLC, not affiliated with or endorsed by CCI or any certifying body. This glossary entry is exam-preparation information, not medical advice or a substitute for clinical judgment. Always verify current clinical practice against primary sources and institutional protocol.