The purpose of this 12-month, observational, follow-up study is to collect additional data (by telephone contact) with which to assess the efficacy, safety, and effects of intramyocardial injections of adult autologous CD34+ cells on quality of life (QoL) in subjects with chronic refractory myocardial ischemia. No treatments will be administered during this study. However, the investigators and other study site personnel and the subjects will remain blinded to the treatment assignments from the core therapeutic study (# 24779) so as to provide a total of 24 months of blinded data.

Inclusion Criteria:

• Subjects who have received treatment with Auto-CD34+ cells or with placebo and who have completed the final study visit (Month 12) of the core therapeutic study 24779
• Subjects who are willing to comply with the specified follow-up evaluations in this study and to provide written informed consent to participate in this study

Subjects who have received treatment with Auto-CD34+ cells (1 x 10^5 (+/-10%) CD34+ cells/kg or 5 x 10^5 (+/-10%) CD34+ cells/kg)or with placebo (saline plus 5% autologous plasma) and who have completed the final study visit (Month 12) of the core therapeutic study 24779