Regional cardiac tissue treatment

1. A method for treating an occlusion in a first coronary artery of a patient comprising:

advancing an occlusion treatment tool through the vasculature of the patient and into the first coronary artery to a coronary artery site of the occlusion;

treating the occlusion with the occlusion treatment tool;

treating microvasculature obstructions at a target cardiac tissue site distal to the coronary artery site of the occlusion, including admitting at least one therapeutic agent to the first coronary artery with the therapeutic agent selected to treat microvasculature obstructions;

withdrawing at least a portion of a blood flow from a coronary vein distal to the cardiac tissue site.

2. A method according to claim 1 comprising oxygenating the blood flow withdrawn from the coronary vein.

3. A method according to claim 2 comprising admitting the oxygenated blood flow to the first coronary artery.

4. A method according to claim 2 comprising admitting at least a portion of the oxygenated blood flow to a second coronary artery of which the first coronary artery is a branch.

5. A method according to claim 1 comprising discarding the blood flow withdrawn from the coronary vein.

6. A method according to claim 1 comprising:

diverting a portion of the blood flow withdrawn from the coronary vein;

oxygenating the diverted portion;

admitting the diverted and oxygenated blood flow to the first coronary artery.

7. A method according to claim 1 wherein, prior to the admitting of the therapeutic agent, the target cardiac tissue is assessed for likelihood of containing microvascular occlusions.

8. A method of treating microvasculature obstructions in a target cardiac tissue region of a patient's heart, said method comprising:

placing a perfusion catheter into a first coronary artery, the perfusion catheter permitting blood flow to the target cardiac tissue region during treatment of the target cardiac tissue region;

treating microvasculature obstructions at the target cardiac tissue, including admitting at least one therapeutic agent to the first coronary artery with the therapeutic agent selected to treat microvascular obstructions;

systemically isolating the therapeutic agent by withdrawing at least a portion of a blood flow from a coronary vein distal to the target cardiac tissue region.

9. A method according to claim 8 comprising oxygenating the blood flow withdrawn from the coronary vein.

10. A method according to claim 9 comprising admitting the oxygenated blood flow to the first coronary artery.

11. A method according to claim 9 comprising admitting at least a portion of the oxygenated blood flow to a second coronary artery of which the first coronary artery is a branch.

12. A method according to claim 8 comprising discarding the blood flow withdrawn from the coronary vein.

13. A method according to claim 8 comprising:

diverting a portion of the blood flow withdrawn from the coronary vein;

oxygenating the diverted portion;

admitting the diverted and oxygenated blood flow to the first coronary artery.

14. A method according to claim 8 wherein, prior to the admitting of the therapeutic agent, the target cardiac tissue is assessed for likelihood of containing microvascular occlusions.

15. A method of treating microvascular obstructions in a region of cardiac tissue of a patient comprising:

identifying a coronary artery of the patient;

placing a perfusion catheter into the identified coronary artery such that the perfusion catheter permits blood flow through the region of cardiac tissue during treatment;

treating microvascular obstructions in the region by admitting at least one therapeutic agent to the identified coronary artery through the perfusion catheter with the therapeutic agent selected to treat microvascular obstructions;

systemically isolating the therapeutic agent by withdrawing at least a portion of a blood flow from a coronary vein distal to the region of cardiac tissue.

16. A method according to claim 15 comprising oxygenating the blood flow withdrawn from the coronary vein.

17. A method according to claim 16 comprising admitting the oxygenated blood flow to the identified coronary artery.

18. A method according to claim 16 , wherein the identified coronary artery is a first coronary artery, the method further comprising admitting at least a portion of the oxygenated blood flow to a second coronary artery of which the first coronary artery is a branch.

19. A method according to claim 15 comprising discarding the blood flow withdrawn from the coronary vein.

20. A method according to claim 15 comprising:

diverting a portion of the blood flow withdrawn from the coronary vein;

oxygenating the diverted portion;

admitting the diverted and oxygenated blood flow to the identified coronary artery.