Oral diabetic med administration prior to Cath Lab procedures

I am a new nurse on a cardiac telemetry unit and am still trying to get acclimated with all the different types of procedures done by our Cath Lab (balloon angioplasty, stents, AICD/pacemaker insertion, EPS/ablation, cardioversion, ASD/PFO closure, MV valvuloplasty). Do you normally hold oral diabetic meds for pts prior to Cath Lab procedures? I know for sure that if contrast will be used, metformin is held. But what about the others? There are so many: glyburide, januvia, starlix, actos, glipezide. On our telemetry unit, we have no formal protocol. Some nurses hold them until they return from their procedure, some give it (as long as blood glucose is WNL). What are your thoughts? Thanks for all that respond.