Experimental data suggest that aldosterone has harmful effects promoting myocardial fibrosis and disturbing autonomic balance. There has been no evidence of these potential effects in intact man.
MacFadyen, R. J., Barr, C. S., & Struthers, A. D. (1997). Aldosterone blockade reduces vascular collagen turnover, improves heart rate variability and reduces early morning rise in heart rate in heart failure patients. Cardiovascular Research, 35(1), 30-4. https://doi.org/10.1016/S0008-6363(97)00091-6