Is it normal that both lower limbs are numb after nerve block?

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

Nerve block

In the nerve trunk, plexus, node around the injection of local anesthetic, block its impulse conduction, so that the innervated area has anesthetic effect, called nerve block. Nerve blocks require a single injection to obtain a large area of anesthesia. However, it may cause serious complications. Therefore, it is necessary to be familiar with the local anatomy, the tissue through which the puncture needle passes, and the nearby blood vessels, organs and body cavities. Nerve blocks are commonly used TO block INTERORBITAL, infraorbital, sciatic and finger (toe) nerve trunks, cervical plexus and brachial plexUS, STellate ganglion and lumbar sympathetic ganglion for diagnosis and treatment.

The patient is supine, with the armpit hair shaved, and the affected limb is abducted 90 °, and the arm is flexed upward 90 °, in a military salute position. The ANESTHETIZED person STANDS on the affected side and feels the axillary artery beat where the lower margin of the pectoralis major meets the medial margin of the arm, and feels the highest point of the beat toward the top of the armpit (FIGURE 8-9). During operation, the needle is held in the right hand, and the left indicator and middle finger are used to fix the skin and artery, and the needle is inserted perpendicular to the skin at the scratching or ulnar edge of the artery. When the sheath is punctured, there is an obvious sense of breakthrough, that is, stop advancing. Release the finger and the needle beats with the pulsation of the artery, indicating that the tip of the needle is in the axillary sheath. After no blood was drawn back, 25~30ml of the prepared local anesthetic solution was injected. Compression of the distal injection point during injection is conducive to the diffusion of liquid to the proximal and distal axillary pins to block the musculocutaneous nerve. Because the musculocutaneous nerve has left the axillary sheath and entered the coracobrachial muscle at the level of the bead process, it is often difficult to block completely, and the anesthetic effect is poor at the lateral forearm and the base of the thumb.

Indications AND COMPLICATIONS: BRACHIAL PLEXUS BLOCK IS SUITABLE FOR UPPER LIMB SURGERY, INTERMUSCULAR SULCUS APPROACH can be used for shoulder surgery, axillary approach is more suitable for forearm and hand surgery. But these three methods are likely to have local anesthetic toxicity.

Phrenic nerve palsy, recurrent laryngeal nerve palsy, and Homer syndrom may also occur on the intermuscular sulcus and supraclavicular paths. Horner syndrome is caused by stellate ganglion block, ipsilateral pupil narrowing, eye ptosis, nasal mucosal congestion and facial flushing symptoms.

If the puncture is improper, pneumothorax may occur in the supraclavicular approach, high epidural block may occur in the muscular sulcus approach, or total spinal anesthesia may be caused by injection of drug solution into the subarachnoid space by mistake.

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