Is it normal to have no sensation after medical nerve block puncture needle of double lower limbs

Yes, it can cause loss of sensation in the lower extremities.

Block of nerve

Local anesthetics are injected around the nerve trunk, plexus and ganglia to block its impulse conduction and make the innervated area produce anesthetic effect, which is called nerve block. A nerve block is injected in only one place to obtain a large area of anesthesia. However, it may cause serious complications, so the operation must be familiar with the local anatomy, understand the tissue that the needle will go through, as well as the nearby blood vessels, organs and body cavity. Common nerve blocks are helpful for interorbital, suborbital, sciatic, finger (toe) nerve stem blocks, cervical plexus and brachial plexus blocks, as well as stellate ganglion and lumbar sympathetic ganglion blocks for diagnosis and treatment.

The patient lay supine, shaved the armpit hair, abducted the affected limb 90 °, and then flexed the arm up 90 °, in a military salute position. Standing on the affected side, the anaesthete felt the axillary artery pulsation at the junction of the lower margin of the pectoralis major and the medial margin of the arm, and felt the highest pulsation toward the top of the axilla (FIG. 8-9). During the operation, the needle was held in the right hand, the indicator and middle finger of the left hand were fixed to the skin and the artery, and the artery was pierced perpendicular to the skin at the flex or ulnar edge of the artery. When the sheath is punctured, the breakthrough is obvious, that is, the progress stops. When the finger is released, the needle beats with the pulse of the artery, indicating that the tip of the needle is in the axillary sheath. After no blood was extracted, 25~30ml of local anesthetic solution was injected. Pressing the distal end of the injection point during injection is conducive to the diffusion of the liquid to the proximal and distal end of the axillary pin, so as to block the myocutaneous nerve. Because the musculocutaneous nerve has left the axillary sheath at the level of the bead process and entered the coracobrachial muscle, it is often not easy to block completely, and the lateral forearm and the base of the thumb under its control to the anesthetic effect is poor.

Indications and complications: Brachial plexus block is suitable for upper extremity surgery, intermuscular sulcus path is suitable for shoulder surgery, and axillary path is more suitable for forearm and hand surgery. But these three methods all have the possibility of local anesthetic toxicity.

Phrenic nerve palsy, recurrent laryngeal nerve palsy and Homer syndrom are also induced by intermuscular sulcus path and supracclavian path. Horner syndrome is caused by stellate ganglion block, ipsilateral pupil constriction, eye ptosis, nasal mucous membrane congestion, facial flushing and other symptoms.

If the puncture is not appropriate, the supraclavicular approach may lead to pneumothorax, the intermuscular sulcus approach may lead to high epidural block, or the injection of drug fluid into the subarachnoid space may lead to spinal anesthesia.