Background: 
Accuracy in brachial plexus localization techniques due to ultrasound and nerve stimulation allowed regional anesthesia to become the method of choice for shoulder surgery. Shoulder surgery produce severe postoperative pain. The interscalene block associated to sedation makes possible a faster postanesthetic recovery. It has been demonstrated that interscalene block offers good control of postoperative pain. 
Methods: 
An observational descriptive study has been done in a period of a year. Aiming to demostrate that interscalene block associated to sedation is effective and safe. A total of 53 patients ASA I-II scheduled for elective arthroscopy shoulder surgery were collected. Midazolam 1-2mg was administrated previous nerve stimulation and echo guided interscalene block with ropivacaine 0,5% 15ml. Once in operating theater sedation was carried out with remifentanil. 
Analgesia status was assessed by visual analogue scale (VAS). 
Results: 
During the year 2018, data were collected from 53 patients undergoing arthroscopy shoulder.
The average age was 60 years (22-85), 23 men and 30 women. 
The average hospital staying was 8 hours.
At PACU , VAS was 0 in 50 patients, VAS 4 in 2 patients and VAS 3 in 1 patient.
At hospital step out, VAS was 0 in 49, VAS 2 in 2 and VAS 5 in 2 patients.
It was found headache and gastritis in 2 patients.
No patient complained of nausea or vomiting.
Conclusions: 
Interscalene block associated to light sedation for shoulder arthroscopy simplifies perioperative management without important side effects. 
This allow to perform arthroscopy shoulder on a day case surgery.

ULTRASOUND GUIDED INTERSCALENE BLOCK ASSOCIATED TO SEDATION FOR ARTHROSCOPY SHOULDER SURGERY