After 7 years of clinical use, percutaneous transluminal coronary angio plasty (PTCA) has now found worldwide acceptance, and its basic techniques are well standardized. A growing number of invasive cardi ologists are acquainting themselves with the procedure in order to be in a position to offer new therapeutic options to their patients. However, the transition from the diagnostic to the therapeutic intervention is not always easily accomplished. Certain prerequisites concerning technique, the physician, technical equipment, and program organization are necessary for safe and effective...