Your husband certainly has a very complicated cardiac history -- which by your descriptions, sounds as though he has failed most conventional therapies (bypass surgery, PCI, etc). If his LAD is completely occluded and supplied by collateral vessels, it will be important to ensure those vessels supplying the blood flow remain healthy/open as they are the primary source to his heart. Further interventions from this point forward would depend primarily on a battery of test results (ejection fraction, stress/viability testing, metabolic stress testing) and his clinical history (presence/degree of angina, heart failure functional class, etc). Potential options would include intervening on the LAD via a chronic total occlusion approach (CTO) (if viable) which is often only performed by a highly experienced operator, usually at a tertiary/quaternary referral center. If he is having significant heart failure, evaluation for advanced therapeutic options may also be indicated (mechanical assist devices, heart transplantation) if there are no other available options to improve his symptoms such as optimizing his medications and/or strategies to improve his rhythm and/or LV function (Bi-ventricular pacing). Evaluation for this would also be performed at a similar institution as mentioned above. I would speak with your primary cardiologist/physician to determine whether or not these are options that should be pursued and for a referral to a center that can provide further assistance in the evaluation (such as Cleveland Clinic). Unfortunately, it is not only difficult, but impossible, to make that determination over the internet alone.
Thank you SO MUCH for taking the time to think about my husband's situation and give us such a thorough and thoughtful answer! You are so kind! Your answer gives me some hope that my husband could regain some of his health in the future if he gets the right medical care! I am going to print out your answer and my husband will take it to his cardiologist appt. next week when they will be discussing my husband's future medical care.
One more question, if you don't mind...my husband was told that he is still alive because of the development of "collateral flow" to his heart. Is it possible that his body will make even more of this collateral flow in the future? We are hoping for that to happen, because we believe he could have more energy if he had more capillaries supplying blood to his heart. Are we correct? Thank you again and again! :-)