Spironolactone and captopril attenuates isoproterenol-induced cardiac remodelling in rats

The role of renin-angiotensin-aldosterone system in cardiac remodelling was studied in isoproterenol-induced cardiac hypertrophy in rats. The effects of captopril and spironolactone were compared. Isoproterenol treatment incr eased ventricular to body weight ratio (4.6 vs 3.7) and collagen area (22.6 vs 8.2%), and reduced systolic (89.93 vs 107.5 mm Hg) and diastolic (59.6 vs 70.8 mm Hg) pressure. In these animals, captopril decreased systolic (67 .4 mm Hg) and diastolic pressure (31.9 mm Hg), whereas spironolactone regre ssed systolic pressure to control values (101.2 mm Hg). Captopril and spiro nolactone prevented cardiac hypertrophy (4.01 and 3.95). However, only spir onolactone prevented myocardial fibrosis (11.3%). (C) 2001 Academic Press.