Hemodialysis is a method for removing waste and excess fluid from the blood of patients with kidney failure. It involves connecting the patient's blood to a dialysis machine via vascular access points, usually a catheter, arteriovenous fistula, or graft. Blood is passed through a dialyzer where waste diffuses out of the blood and into the dialysate fluid before being returned to the patient. Potential side effects include low blood pressure and infection risks from the vascular access.