Several studies in neuroaxial anaesthesia and peripheral blocks have found that puncture processing performed under ultrasound guidance has many advantages over the old classic methods, Complications of this blind block include: hematoma, systemic toxicity because of accidental intravenous local anaesthetic injection, nerve injury and pneumothorax. One of the major advantages of these techniques is that they provide the opportunity to show the patient the anatomical situation before the puncture using a near harmless and effective technique.