Pulse-ox has a lag time of sec to mins<unk>  will show real-time respiratory changes and apnea
ETCO2 monitoring detects clinically signifcant respiratory events before SPO2 or clinically noted apnea/hypoventilation
Capnography
Compartment pressure measurement
Thromboelastography 
Glasgow-Blatchford Bleeding Score
Tourniquet
Tourniquet 
Age adjusted D-dimer
D-dimer