Is adenosine preconditioning cardioprotective in coronary artery bypass surgery?

Maybe: Experimental models (mice, chickens) have shown some benefit of Adenosine before and during cardiac surgery. However, clinical studies in actual patients have not shown as significant a benefit - similar to Adenosine treatment in patients with acute mi.

Not sure: Haven't heard that one. In cardiac surgery, myocardial protection is key to a good result. There are multiple methods available, for use in both on- pump and off- pump cases. A good cardiac surgeon is well- versed in using them appropriately.