Method Wrapping 2 plastic zip ties around the upper side of the neck?

[kji821]

So i kept seeing methods that imply blocking the blood flow from the veins from the sides of the neck without blocking the air path so you won't start running out of breath and suffer. I saw that one person managed to do it by wrapping 2 plastic zip ties around the upper side of his neck.

Is such a method safe and effective and does it have any chances of failing and causing any kind of damage to the brain? And if it would work, how thin the zip ties should be?

 

[Captain laser]

im not really sure but failing can cause a bit of damage, after i failed once i started getting the same dizzyness you get when you stand up too quickly, but almost constantly when i was upright, it took about a week for it to go away.