* 1,000 participants will be enrolled into the OPEN CTO study.
* Study coordinators will screen both men and women over the age of 18 who are admitted for an elective CTO-PCI procedure.
* Study coordinators will be trained by the Coordinating Center at Saint Luke's Hospital of Kansas City.
* Participants will be screened for Eligibility, and Informed Consent will be obtained.
* Participants will also be asked to sign a Medical Records Release form, and a Billing Records Release form.
* Detailed procedural data will be obtained by the Study Coordinator and local Principal Investigator.
* Participants will undergo a Baseline interview.
* These data will be entered into the electronic data capture system, Velos, which has stringent protections and quality controls.
* Participants will have telephone follow-up interviews conducted by the centralized Follow-up Center at Saint Luke's Hospital.
