Table 1

Clinical characteristics of the patients studied

No visible collateralsVisible collateralsAll patients
Number201131
Age (years)56 (11)55 (10)56 (11)
Left ventricular ejection fraction (%)58 (7)55 (4)57 (6)
RCA, LAD disease (n)6, 143, 89, 22
Balloon size (mm)3.5 (0.4)3.4 (0.4)3.5 (0.4)
Atmospheres14 (5)14 (3)14 (3)
Stent (number of patients)13619
% Stenosis before angioplasty84 (7)87 (7)85 (7)
% Stenosis after angioplasty8 (5)8 (7)8 (6)
  • Values are mean (SD) unless otherwise specified.

  • LAD, left anterior descending artery; RCA, right coronary artery. The clinical characteristics of the 2 subgroups were similar.