Renal dialysis. Machines do not dialyze the kidney. They remove toxins from the blood that the kidney normally does. So risks are; 1. You die without dialysis. I call this a bad risk. 2. You live longer and feel better. I call this a good risk. Other than that discuss you particular situation with your medical team.
Dialysis machine. The purpose of a dialysis machine (d) and the artificial kidney (a) used on it is to replace the function of the kidneys of a end stage renal disease kidney patient which do not work. The a filters the blood of the patient removing waste products and water the diseased kidneys of the patient cannot do. This prevents the patient dying of kidney failure.