= Left anterior descending artery
= Anterior interventricular artery
{synonym}
The \b[left anterior descending artery], also called the \b[anterior interventricular artery], is a major branch of the <left coronary artery>. It follows the <anterior interventricular sulcus> toward the apex and contributes to anterior ventricular and septal supply.<Anatomy and Physiology 2e by J. Gordon Betts and others>[Section 19.1, left-coronary branches and Figure 19.15]{ref} Its course differs from that of the <circumflex artery>.
The anterior and <posterior descending artery> names describe different interventricular routes. They are not two names for one artery, and the anterior branch's parent should not be inferred from the posterior branch's <coronary dominance> classification.
For measurement, the important question is where an observation sits in the network. A proximal <left coronary artery> observation represents a parent segment. A measurement made selectively in the anterior branch represents a different path and a more restricted downstream territory. Combining that flow with an oxygen measurement from an incompatible venous mixture can fail to describe a matched tissue balance.
The primary coronary thermodilution study illustrates branch-level instrumentation: saline infusion and a pressure/temperature-sensing guidewire were used to estimate volumetric flow in a selected coronary artery.<Direct volumetric blood flow measurement in coronary arteries by thermodilution by Wilbert Aarnoudse and others>[Abstract, Methods]{ref} The instrument measures flow under its model, rather than inferring it solely from the branch name or its image.
Thus the artery provides a specific anatomical reference for interpreting selective images, <coronary angioplasty> and regional supply. The route, observed geometry, actual flow and the myocardium represented by a sample should be identified separately before they are combined into a physiological conclusion.
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