[Interscalene plexus block. Anatomic requirements--anesthesiologic and operative aspects].

The interscalene brachial plexus block with and without a catheter has become an indispensable method for anaesthesia and analgesia in shoulder surgery. Not only thorough knowledge of anatomy, but also accurate indication assessment and discussion with the surgeon regarding the location of access, is essential for the successful practice of this technique. Important and practical tips for implementation should especially help the less experienced, with special emphasis on correct positioning of the patient for surgery to avoid iatrogenic neural damage. Preoperative counselling of inevitable side-effects of the technique enhances the patient's acceptance and satisfaction.