Patients with kidney failure on dialysis have a much higher risk of developing cardiovascular disease as compared to the general population. Recently, two large studies have shown that increasing the amount of dialysis does not decrease cardiovascular disease. It is known that retaining too much fluid leads to high blood pressure and thickening of the heart wall. Peritoneal dialysis is a method of home dialysis which allows dialysis patients autonomy and independence. This study will measure blood levels of a protein called N-BNP and measure the extent of body fluid by a machine called a bioimpedance analyzer. This device administers an undetectible electric current which distributes throughout total body water. The relationship between these tests and the clinical presence of volume expansion will be assessed. In addition, the extent of total body fluid and it's impact on heart attacks, heart failure and stroke will be determined.
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