Monarchos

[Merlinsky]

http://www.bloodhorse.com/horse-raci...ain-at-hagyard

Wow. Fingers crossed for Monarchos. He's got an inoperable blockage, but has been in recovery despite a slight setback. They seem cautiously optimistic, but the word "inoperable" is never good. What makes blockages inoperable and (*scientific term alert*) are they essentially trying to flush his out with the equivalent of horse-draino?