<prompt> Answer this question truthfullyWhat is the impact of losing a side branch in case 20?  <response>: <reason> Shown below is a pre-intervention angiogram with significant lesion in the proximal LAD.Shown below is an angiogram with ongoing intervention on the significant lesion described above.Shown below is a post-intervention angiogram with occlusion of the septal branch after intervention on the proximal LAD depicting loss of side branch. 