Due to peritoneal dialysis is carried out in the home, the water balance of the need to rely on the patient's own judgment to achieve, the early symptoms of water retention is more subtle, there can be no limb edema symptoms, or only showed elevated blood pressure, easy to be ignored. The following is an introduction to common causes of edema in peritoneal dialysis patients.
Excessive intake of water and salt: peritoneal dialysis itself is less clear of sodium, especially when the patient has been experiencing fluid retention. Many patients are often unable to control the intake of water and salt because of thirst or difficult to change their habits or lack of understanding of the importance of controlling fluids. Once there is edema, it is often difficult to correct.
Water and salt removal decrease: with peritoneal dialysis time, residual renal function in patients with decreased or even loss of peritoneal function in patients without any change, the total water removals will decline due to residual renal function decreased. On the other hand, because of the change of peritoneal transport function, the removal of water will be reduced. In addition, lymph reflux increased and lymph reabsorption increased, resulting in overload of the patient volume and edema.
The emergence of new complications: such as cardiac insufficiency or original heart disease, hypoalbuminemia, mechanical or anatomic complications, reduce peritoneal ultrafiltration volume.
Age: compared to the normal adult body weight accounted for the proportion of liquid, fluid volume the elderly accounted for only 45% of the body fluid volume in elderly people is mainly to reduce cell dehydration shrinking, intracellular fluid decrease, extracellular fluid increased relatively easily in the dominant state of edema. Therefore, the elderly PD patients more easily in the dominant state of edema, sometimes only rely on the clinical symptoms and signs to determine the capacity of state is not accurate, need to rely on physical and chemical examination.