Renal replacement therapy is frequently required in critically ill patients for the treatment of acute renal failure as well as end-stage renal disease. Intermittent hemodialysis remains the worldwide standard of care for intensive care unit (ICU) patients. With intermittent hemodialysis, large volumes of fluid often need to be removed over a relatively short period of time, thus jeopardizing hemodynamic stability in frequently already hemodynamically compromised patients. Intradialytic hypotension and orthostatic hypotension after the procedure are significant and independent risk factors affecting mortality in dialysis patients. Impedance cardiography (ICG) and Electrical Cardiometry (EC) are recently noninvasive methods for hemodynamic monitoring and determination of fluid status of critically ill patients. That can aid the intradialytic assessment of fluid removal objectively and avoid hemodynamic instability.