Eplerenone in the Management of Abdominal Aortic Aneurysms

Inclusion Criteria: * Individuals aged over 60years (inclusive); AAA measuring a maximum diameter of 30-49 mm on MRI; no current indication for AAA repair according to the treating physician or expectation that this will be revised within the next year; high likelihood of compliance with treatment over 12 months; stable medication regime for the last six months; have given signed informed consent to participate in the study. Exclusion Criteria: * Serum potassium concentration of more than 5.0 mmol/L before randomisation; evidence of renal impairment defined as serum creatinine\>133 umol/L or creatinine clearance of \<60 mL/min; known significant renal stenosis (\>70%) of one or both renal arteries; evidence of liver disease (i.e. cirrhosis or hepatitis) or abnormal liver function defined as aspartate aminotransferase, alanine aminotransferase or total bilirubin \>1.5x the upper limit of normal; evidence of primary aldosteronism (plasma aldosterone/renin ratio\>650 pmol/L); electrolyte imbalance; active gout; use of MR antagonists; use of potassium-sparing diuretics, or potassium supplements; individuals with claustrophobia or a history of any metallic prosthetic implant contraindicating MRI.