PDA
Also written as: PDA — Posterior Descending Artery
Posterior descending artery, which supplies the inferior wall of the left ventricle and inferior interventricular septum.
Full Definition
The posterior descending artery (PDA) runs in the posterior interventricular groove and supplies the inferior wall of the left ventricle and the inferior portion of the interventricular septum. In 85-90% of patients, the PDA arises from the right coronary artery (right dominance), while in 10-15% it originates from the left circumflex artery (left dominance). The origin of the PDA determines coronary dominance, which has important implications for collateral circulation and the consequences of coronary occlusions. In cardiovascular imaging, PDA assessment includes evaluation of its origin, course, and the territory it supplies, particularly in the setting of inferior wall ischemia.
Usage
Usage note: In cardiology context, distinguish from patent ductus arteriosus (also abbreviated PDA).
In Context
- "The PDA arising from the RCA showed severe stenosis at its origin, consistent with the patient's inferior wall infarct." — Cardiac catheterization report
- "Left dominance was noted with the PDA originating from the distal circumflex artery." — Anatomical assessment