| Coronary arteries include right coronary artery (RCA) arises from right aortic sinussupplies right ventricle and His bundlebranchessinoatrial nodal artery supplies the sino-atrial (SA) noderight marginal arterysupplies the right ventricleposterior descending artery (PDA) supplies AV node (supplied by atrioventricular nodal artery)posterior portion of interventricular septum and ventriclesposteromedial papillary muscleleft main coronary artery (LCA)arises from left aortic sinusbranchesleft circumflex coronary artery (LCX) supplies lateral and posterior wall of left ventricleanterolateral papillary musclesupplies some blood flow to SA node and AV nodeleft anterior descending artery (LAD) supplies anterior portion of the interventricular septumleft ventricular sinus anterolateral papillary muscleanterior surface of the left ventriclemost common artery to be involved in myocardial infarctionCoronary arterial system dominancedefined by which artery supplies the PDAright dominance85% of casesRCA gives rise to PDA left dominance8% of casesLCX gives rise to PDAcodominance7% of casesboth LCX and RCA give rise to PDACoronary sinus the endpoint of coronary flow and is continuous with the right atriumin chronic pulmonary hypertension, coronary sinus becomes dilatedblood in the coronary sinus has the lowest oxygen content in the bodyoxygen saturation levels 30% Left atriummost posterior part of the heartenlargement can compressthe esophagus, causing dysphagiathe left recurrent laryngeal nerve, causing hoarseness |
