re your questions
I think any surgery of this magnitude can be potentially life threatening. Depends on the patient and the surgeon.
I do not take spine surgery lightly after my failed percutaneous discectomy on L4. I took that far too lightly. Big mistake. By the time I was eligble for a 2 level ADR I was too scared to go thru w/it.
I don't know what a vein barrier is so cannot answer that question tho could google it and probably find out tho would rather you define it since you asked the question.
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