Everyone has the right to do whatever they want with their dialysis, but in the long run it might catch up with you.
In the States, that form is called an AMA-- Against Medical Advice.The 'catch' at my unit is, sometimes the nurse will get you to sign it, but then screw around with other patients so long that by the time they come over to you and disconnect you, it's almost the time when you would normally be coming off the machine, anyway. It's interesting that when nurses decide to take people off early because they have too many patients coming off at the same time, you NEVER have to sign that paper-- you only have to sign it when it's YOUR idea to end treatment early.
What ticks me off is when the clinic puts me on 20 minutes late, that's alright. But if I'm 10 minutes late they cut my run time even when nobody will be using my machine after me.