Letter by Spence et al regarding article, "Impact of patient and target-vessel characteristics on arterial and venous bypass graft patency: insight from a randomized trial".

To the Editor: In their recent article1 based on the 440 patients who underwent angiographic follow-up, Desai et al have proposed factors that may explain the superior radial artery compared with saphenous vein graft patency observed in their well-designed Radial Artery Patency Study.2 We are interested in the model predictors chosen a priori on the …