Regional Perfusion of the LV
The ventricle is divided into segments for regional wall assessment. Segmentation schemes reflect coronary perfusion territories result in segments with comparable myocardial mass, and allow standardized communication within echocardiography and with other imaging modalities. Currently there are 17 segments used in regional wall assessment and out of the scope for FoCUS interrogation since multiple chamber views are needed. However they are mentioned here for illustration purposes
As a reminder, the objectives of FoCUS here is to do semiquantification of ranges of function (e.g., the left ventricle is hyperkinetic, normokinetic, hypokinetic, or severely hypokinetic).
1A. Coronary perfusion model: 3D overview
The right coronary artery (RCA) originates from the right aspect of the aortic bulb. The RCA gives of the Right Marginal Artery (RMA) which supplies the entire right ventricle. The RCA gives off the Posterior Descending Artery (PDA).
The left main coronary artery branches into the left anterior descending artery (LAD) and the left circumflex coronary artery (Cx). The LAD gives off the Diagonal (D1) branches which supply the anterior and anterolateral walls of the left ventricle. The Cx give off the obtuse marginal arteries (M1) which supply the lateral wall of the left ventricle