What are treatments for anteroseptal ischemia?

Several. This just refers to the location in the heart of a lack of blood supply. The possible treatments are medication, angioplasty with stent, or surgery (bypass operation) if there is a blockage. If the reason for the problem is something other than a blockage, such as anemia or lung disease resulting in a low oxygen, then the treatment would be directed at correcting the primary problem.
Some options. Medical with Nitroglycerin depending on symptoms. If shown to be left anterior descending coronary disease, then stenting or bypass may be considered.