Comparison of the transradial and transfemoral approaches for coronary angiographic evaluation in patients with internal mammary artery grafts.

Objective: Transradial access for coronary angiography may offer some advantages in comparison with conventional transfemoral access in specific subgroups of patients. Therefore, the aim of this study was to compare the transradial and transfemoral approaches in patients with previous coronary artery bypass graft (CABG) surgery using the left internal mammary artery (IMA).
Methods: The time to left IMA cannulation, the time needed for left IMA evaluation, and total procedure time were compared in 60 patients previously submitted to CABG surgery using the left IMA. The homolateral radial access was attempted in 20 consecutive patients (TR group), whereas the transfemoral approach was undertaken in 40 patients (2: 1, TF group), matched for age, sex and number of grafts.
Results: In the TR group, the time to left IMA cannulation and the time needed for left IMA evaluation were 39% and 46%, respectively, lower than those in the TF group (P = 0.01 and P = 0.001, respectively), whereas total procedure time was similar. In the subgroup of patients with less than three saphenous vein grafts (n = 36), the time to left IMA cannulation, the time needed for left IMA evaluation as well as total procedure time were significantly reduced (P = 0.01, P = 0.001 and P = 0.004, respectively). The rate of ad-hoc coronary angioplasty procedures was unaffected by the access site (20% in the TR group and 27% in the TF group, P = 0.53).
Conclusions: The present study shows that the homolateral transradial approach facilitates left IMA evaluation in patients with previous CABG surgery undergoing coronary angiography, in particular in patients with a lower number of coronary artery bypass conduits, in the absence of an excess of periprocedural complications.