Skip to main content
. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: Am Heart J. 2015 Apr 23;170(2):330–338. doi: 10.1016/j.ahj.2015.02.025

Figure 1.

Figure 1

Study sample. There were 105,698 evaluable Medicare patients in the NCDR who underwent initial ICD implantation from 2006 to 2009 after matching with CMS claims data in the corresponding period. After excluding patients with secondary prevention indications, CRT, cardiac arrest, sustained VT, and syncope, 38,912 implant procedures for primary prevention indications were included in the current analysis.