Objective To discuss the significance of blood volume monitor during the hemodialysis to the old patients. Methods Fourty - four patients who took hemodialysis were selected to take blood volume monitor for 122 times (young patients 54 times , old patients accompany with heart malfunction 40 times, old patients without heart malfunction 28 times), then observe volume descent titer △BV,ultrafiltration dose,heart rate,blood pressure and the incidence of complications, such as tic simultan ously. Results Under...