1 / 11

Coronary Circulation

Coronary Circulation. The Coronary Arteries. Blood is supplied to the heart by its own vascular system called the coronary arteries. Off the left ventricle, the aorta branches off into two main coronary blood vessels (arteries).

ernestpatrick
Download Presentation

Coronary Circulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Coronary Circulation

  2. The Coronary Arteries • Blood is supplied to the heart by its own vascular system called the coronary arteries. • Off the left ventricle, the aorta branches off into two main coronary blood vessels (arteries). • There are epicardial coronary arteries and those that run deeper into the myocardium and are called subendocardial coronary arteries.

  3. The Coronary Arteries • The right coronary artery supplies blood mainly to the right side of the heart. • The left coronary artery supplies blood to the left side of the heart and branches into the left anterior descending artery and the circumflex artery. • The exact anatomy of the myocardial blood supply varies from person to person.

  4. More About the Coronary Arteries • The right coronary artery splits into the marginal branch which supplies blood to the right ventricle and the posterior interventricular branch which supplies the left ventricle.

  5. More About the Coronary Arteries • The left coronary artery is larger than the right coronary artery because it feeds the left heart. It splits into the anterior interventricular branch (ventricles and ventricular septum) and the circumflex branch (follows the groove between the left atrium and left ventricle supplying blood to both chambers).

  6. More Coronary Artery Info • The circumflex joins the coronary artery in the posterior heart. • Blood passing through the chambers does not supply blood to the myocardium.

  7. The Layout of the Coronary Arteries

  8. Layout of the Coronary Arteries

  9. Coronary Flow • During contraction of the ventricular myocardium (systole), the subendocardial coronary vessels are compressed due to high intraventricular pressures. • However, the epicardial coronary vessels remain patent. • At this point blood flow to the subendocardium stops.

  10. Coronary Flow • Most myocardial perfusion occurs during relaxation (diastole) when the subendocardial arteries are patent and under low pressure. • Failure of oxygen delivery from decreased blood flow with increased oxygen demand results in tissue ischemia. • Brief ischemia is associated with chest pain (angina).

  11. Just a Little More • Severe ischemia can result in myocardial cell death. • The majority of the coronary vessels dilate with norepinephrine due to predominance of beta-adrenergic receptors in coronary circulation.

More Related