EEG	Electroencephalography
PTA	Parasympathetic tone activity
BIS	Bispectral Index
PSI	Patient State Index
TPLO	Tibial plateau leveling osteotomy
FC	Fentanyl constant rate infusion
ME	Morphine epidural
RB	Saphenous and sciatic regional nerve block
Et-CO2	End tidal carbon dioxide
Et-Iso	End tidal isoflurane
HR	Heart rate
SBP	Systolic blood pressure
MBP	Mean blood pressure
DBP	Diastolic blood pressure
SR	Suppression Ratio
SEF-L	95% Left Spectral Edge Frequency
SEF-R	95% Right Spectral Edge Frequency
DSA	Density Spectral Array
mPTA	Median PTA
CMPS-SF	Glasgow Composite Measure Pain Scale-Short Form
CIs	Confidence intervals