Core Temperature Variations During Midazolam vs Propofol Sedation for Neuraxial Anesthesia

The investigators will administer 0,05mg/kg of midazolam, being 2/3 administered before the neuraxial block and 1/3 after.

The investigators will administer 0,033mg/kg of midazolam before the neuraxial block, and immediately after installation of the block the investigators will start a propofol TCI pump (Schnider model) with an effect concentration set at 1mcg/mL. This pump will be turned off at the end of the surgery.

The investigators will administer to every patient: cefazolin 2g iv bolus, ketorolac 30 mg iv bolus, pantoprazole 40 mg iv bolus, paracetamol 1g iv perfusion (initiated 30 minutes before the end of surgery).

Central temperature will be monitored with the SpotOnTM3MTM device from entering till leaving the operating room, through a sensor placed in the patient's forehead