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

During epidural block, when puncture needle or epidural catheter strays into subarachnoid space and fails to detect it in time, local anesthetic several times more than spinal anesthesia is injected into the subarachnoid space, abnormal extensive block can occur, which is called whole-spinal anesthesia. The clinical manifestations are no pain, hypotension, loss of consciousness and respiratory arrest in all spinal innervation areas. The symptoms usually appear within a few minutes after injection, and cardiac arrest may occur if the treatment is not timely.