Volume expansion and sodium balance in peritoneal dialysis patients. Part I: Recent concepts in pathogenesis

Area of Science:

• Nephrology
• Cardiovascular Medicine
• Internal Medicine

Background:

• Cardiovascular disease is a primary cause of mortality in end-stage renal disease (ESRD) patients.
• Uncontrolled hypertension and fluid overload negatively affect left ventricular geometry and survival in dialysis patients.
• Declining residual renal function impairs adequate sodium removal, exacerbating volume expansion and hypertension.

Purpose of the Study:

• To review the relationship between dietary salt intake, blood pressure, and volume control in peritoneal dialysis (PD) patients.
• To examine the effectiveness of various PD modalities for sodium removal.
• To highlight the critical roles of volume expansion and hypertension in PD patient outcomes.

Main Methods:

• Literature review of dietary salt intake and its effects on blood pressure and volume in PD.
• Analysis of studies on sodium removal using different PD modalities.
• Emphasis on the clinical significance of volume expansion and hypertension in PD.

Main Results:

• Excessive salt intake is a major challenge in PD, leading to impaired sodium removal and volume expansion.
• Volume expansion and uncontrolled hypertension are significant predictors of poor survival in PD patients.
• PD modalities play a role in sodium and fluid management, but challenges remain.

Conclusions:

• Dietary salt restriction is essential for effective volume and blood pressure management in PD patients.
• Understanding the interplay between salt intake, PD modalities, and cardiovascular outcomes is critical.
• Further strategies are needed to optimize sodium and fluid removal in PD.