Dialysis instability is an important patient safety problem. Session instability is linked to injury to the heart and other organs. Patients who have unstable dialysis sessions are more likely to end up in the hospital or die than are those who have stable sessions. Session instability is preventable. The main causes of instability are removal of fluid from a patient too fast or removal of too much fluid. Session instability results from many factors: decisions made by patients, decisions by healthcare providers, and dialysis clinic policies.