Figure 1  .

Study population. All patients allocated to the guided balloon angioplasty group of the DEBATE II trial who did not require bail out stenting formed the population for our substudy (395 patients). Of these, 139 had no data of the reference vessel coronary flow velocity reserve available and were therefore excluded from further analysis. The remaining 256 patients underwent a second randomisation to additional stenting or termination of the procedure. We analysed these patients depending on the presence (group A) or absence (group B) of uncomplicated "moderate" dissections.