A single center will retrospectively review up to 700 subjects who underwent implantation of a CIED with a CanGaroo Envelope, TYRX Envelope, or no envelope. All sets of subjects enrolled will also be examined for any follow-up visits and/or adverse events that occurred up to 12 months post-surgery.
The objective of this study is to retrospectively gather information on patients who underwent a CIED procedure with either a CanGaroo Envelope, TYRX Envelope, or no envelope.