Romanian Entropy Clinical Study Network (ROEntropy)

Inclusion Criteria:

• ASA physical status I, II, III;
• written consent accepted to be enrolled in the study; in polytrauma patients in the operation theatre who are brought directly through the emergency department, written consent is obtained from the relatives, in accordance to the national law number 206, of 2004, for a good and correct scientific research, in the situation where the patient is no capable to sign or give the written consent;

Exclusion Criteria:

• cardiac pacemaker;
• atrial fibrillation at the time of presentation in the operation theatre;
• any subject with epidural catheter, placed pre-operatively;
• allergy to Propofol or another anesthetic drugs;
• pregnancy;
• presence of neuromuscular disease;
• presence of neurologic disease;