<Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The left anterior descending artery (also LAD, anterior interventricular branch of left coronary artery, or anterior descending branch) is a branch of the left coronary artery . Occlusion of this artery is often called the widow - maker infarction due to a high death risk . </P> <P> It passes at first behind the pulmonary artery and then comes forward between that vessel and the left atrium to reach the anterior interventricular sulcus, along which it descends to the notch of cardiac apex . </P> <P> Although rare, multiple anomalous courses of the LAD have been described . These include the origin of the artery from the right aortic sinus . </P>

Where is the lad located in the heart