A 2000 US paper stated pre-emptive analgesics can prevent spreads during operations. I have read posts stating for amputation it needs to be a continuous full sympathetic nerve block from 48hrs pre-op to 48 post. I would therefore insist on one from 24 pre to 24 post.
Only paediatric needles should be used

Hospital protocol

http://www.rsds.org/Resources/hospital_protocol.html