Question: what is gdmt beta blocker?
Answer: GDMT was defined as 1 or more prescription fill for both a heart failure beta blocker (HFBB), carvedilol, metoprolol, or bisoprolol, and any renin-angiotensin inhibitor (RAI) (angiotensin converting enzyme inhibitor or angiotensin receptor blocker) in the 90 days before ICD implantation (Online Table 2).