<qa>  What is the blockade of the RAAS?The blockade of the RAAS is to increase the effect of the angiotensin receptor 1 blockers ARBs. Therapy then requires sequentially adding an angiotensin converting enzyme ACE inhibitor to reduce the levels of angiotensin Ang II resulting from the blockage of the Ang II receptor and then to administer a beta-blocker to decrease the elevated renin secretion due to both the ACE inhibitors and ARBs. 