_Sky's advice is very sound

You should be very specific.

I have signed several of these for myself, when my kidneys failed, & once for my mother, who was 96, & twice for my h, who has a terminal diagnosis.

You should specify EXACTLY which circumstances you would not want to be revived under, eg, life support for ever, probable brain damage, quality of life issues etc.

I took legal & medical advice on this several times. If you want to talk about it, feel free to PM me.

My h has also refused the transplant possibility, although we found it a very hard decision.

I wish you the best possible outcome with your surgery.