What are the clinical manifestations of epidural needle and total spinal anesthesia

When the puncture needle or epidural catheter strays into the subarachnoid space and fails to detect it in time during epidural block, the injection of local anesthetics several times more than the spinal anesthesia into the subarachnoid space may result in abnormally extensive block, which is called total spinal anesthesia. The clinical manifestations are no pain, hypotension, loss of consciousness and respiratory arrest in all spinal innervation areas. Most of the symptoms appear within a few minutes after injection, and cardiac arrest may occur if the treatment is not timely.