Enucleation- anesthesia induced arrythmia. HR went from 200 to 20 within 10 seconds. Dr stopped cutting, we got an ecg on him, wasnt doing well, dr wanted every machine and a stethescope on him, wasnt leveling out so we woke him up. TPLO- HR steady at 80-90, pressures fine. Adjusting iso %, no change. HR dropped to 45-50, gave atropine, everything went up.