Is It Normal That Both Lower Limbs Are Numb After Nerve Block?

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.

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