Spinal anaesthesia
Spinal anaesthesia ( or spinal anesthesia ) , also called spinal block , subarachnoid block , intradural block and intrathecal block , is a form of neuraxial regional anaesthesia involving the injection of a local anaesthetic or opioid into the subarachnoid space , generally through a fine needle , usually long . 
<triplet> local anaesthetic <subj> regional anaesthesia <obj> use