Vertebral Artery Blockage

My Husband has a 100% blockage in the left vertebral artery and a 75% Blockage in the left carodid artery.
He recently had a stent placed in the Basilar artery which was blocked 75% also before surgery. He had a stroke after the procedure which has left him paralized on his left side.  The question is how dangerous is it to leave the other arteries like they are?  

[oc1dean]

I have the right carotid artery 100% blocked. My doctor tells me that the other three arteries supplying the brain can easily do the job. The one that is now blocked had dissected and let a clot go which led to my stroke, so I am actually glad it is now blocked, one less thing to worry about. Ask your doctor if you should be concerned.
Dean

[krissy188]

I am 39 years old and recently was told that I have absent flow of blood in the left vertebral artery going to the brain. No-one seems to want to do anything about it.
I have had headaches, dizzyness, weakness in my arms, speach problems, from your personal exerience can you tell me is it normal for a doctor not to want to do anything about this? They told me it is congenital and I was probably born this way,

[Dr_Aparna]

Hi,
In increasing numbers of primary stroke centers, pharmacologic thrombolysis ("clot busting") with the drug tissue plasminogen activator, tPA, is used to dissolve the clot and unblock the artery.
Anticoagulation can prevent recurrent stroke.Anticoagulation can reduce stroke by 60% while antiplatelet agents can reduce stroke bY 20%.
These regimens are part of thrombolytic therapy for embolic stroke- the type your husband suffered.
The remaining clots would also benefit from the same.
Another intervention for acute ischemic stroke is removal of the offending thrombus directly.
You could discuss this with your attending doctor.
ref:http://en.wikipedia.org/wiki/Stroke