Study Objective: To report the results of single and continuous interscalene blocks (ISB) performed using ultrasound (US) guidance only.
Design: Prospective, observational study.
Setting: Operating room of a university-affiliated orthopaedic hospital.
Patients: 200 ASA physical status I, II, and III patients undergoing shoulder or elbow surgery.
Interventions: Single or continuous ISB were placed using US guidance only. All blocks were performed by anesthesiology residents and supervised by faculty anesthesiologists.
Measurements: Success rate and frequency of untoward events such as needle paresthesia, vessel puncture, infection, and persistent neurologic deficits were prospectively recorded.
Main Results: 99% of patients reported sensory and motor changes in the distribution of the brachial plexus and postoperative pain scores
Conclusions: In this group of 200 consecutive patients, the success rate for postoperative analgesia using US guidance only was 99%. Untoward events such as needle paresthesia and persistent neurologic deficits were lower than existing data on nerve stimulation and paresthesia techniques. Ultrasound can be successfully used as a "stand alone" method to perform ISB.
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