The second registry established five year mortality and morbidity rates for the 1985-1986 cohort as well as determined functional status and subsequent revascularization. Secondary goals included estimating rates of clinically apparent restenosis for all patients and for important subgroups, determining recurrence of symptoms, seeking predictors of long-term response to PTCA overall and in subgroups, determining PTCA success angiographically, and providing background information for the NHLBI clinical trial, Bypass Angioplasty Revascularization Investigation (BARI). Sixteen center participated in the second registry. Patient follow-up was performed independently of medical care visits. The National Death Index was searched for patients who were judged lost to follow-up. Each center determined angiographically the results of angioplasty but also sent all cineangiograms to a central laboratory.