Aldosterone blockade is useful in preserving residual renal function in patients on PD.The long term efficacy of dual blockade of the RAAS is better than monotherapy.

Residual renal function has been proven to contribute to improved survival and quality of life of dialysis patients. It is now recognized as an important factor in the prognosis of PD.The RAAS system is involved in the development of renal diseases. Angiotensin II and aldosterone are vital in this process. The beneficial effect of angiotensin-converting enzyme inhibitor or angiotensin receptor blocker on residual renal function has been demonstrated in peritoneal dialysis patients. Unfortunately, neither ACE inhibition nor angiotensin receptor blocker fully supprsses aldosterone production. Now much focus has been placed on aldosterone antagonist.

Inclusion Criteria:

• Patients who having been on PD continuously for one month, urine volume>600 ml/d, residual renal function>2ml/min/1.73m2, blood pressure>120/70mmHg, serum potassium levels<5.5mmol/l, stable clinical condition.

Exclusion Criteria:

• Patients with infectious systemic disease, peritonitis during the preceding 1 month, who had taken ACEI/ARBs in the 3 preceding months, spirolactone in the 2 preceding weeks, intolerance to ACEI/ARBs, CHF, MI, malignant hypertension and stroke within the preceding 6 months.