Lumbar Sympathetic Block

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Lumbar Sympathetic Block (LSB)

What is a Lumbar Sympathetic block (LSB)?

A lumbar sympathetic block (LSB) is an injection of local anesthetic (numbing medicine) into or around the sympathetic nerves. These sympathetic nerves are a part of the sympathetic nervous system. The nerves are located on either side of the spine, in the lower back. Normally, these nerves control basic functions like regulating blood flow. In certain conditions, these sympathetic nerves can carry pain information from the peripheral tissues back to the spinal cord. A LSB is performed to block the sympathetic nerves that go to the leg on the same side as the injection. This may, in turn, reduce pain, swelling, color, sweating and other unusual changes in the lower extremity and may improve mobility. It is done as a part of the treatment of Reflex Sympathetic Dystrophy (RSD), Sympathetic Maintained Pain, Complex Regional Pain Syndrome and Herpes Zoster (shingles) involving the legs. Certain patients with neuropathy or peripheral vascular disease may also benefit from lumbar sympathetic blocks.

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