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Stellate Ganglion & Lumbar Sympathetic Blocks | Austin, TX

Sympathetic Nerve Blocks

Targeted blockade of the sympathetic nervous system — essential for treating CRPS, vascular pain, and certain neuropathic pain syndromes.

Overview

Sympathetic nerve blocks target the sympathetic nervous system — the part of the autonomic nervous system that regulates blood flow, temperature, and, in certain pain conditions, amplifies pain signals. The two most common sympathetic blocks in pain medicine are the stellate ganglion block (for upper extremity and head/neck conditions) and the lumbar sympathetic block (for lower extremity conditions, particularly CRPS). These procedures are performed under fluoroscopic guidance and are essential tools in the management of complex regional pain syndrome (CRPS) and other sympathetically maintained pain syndromes.

The Role of the Sympathetic Nervous System in Pain

In CRPS and certain neuropathic pain syndromes, the sympathetic nervous system becomes pathologically coupled with the pain system — a phenomenon called sympathetically maintained pain (SMP). Sympathetic activation (from stress, cold, or other triggers) amplifies pain, produces vasomotor changes (skin color and temperature changes), and sustains the pain cycle. Sympathetic nerve blocks interrupt this coupling, providing relief and helping to 'reset' the nervous system.

Stellate Ganglion Block

The stellate ganglion is a sympathetic nerve cluster at the base of the neck. Stellate ganglion block (SGB) interrupts sympathetic outflow to the head, neck, arm, and hand — making it a key treatment for upper extremity CRPS. It is also used for certain headache conditions, post-traumatic stress, and hot flashes. SGB is performed under fluoroscopic or ultrasound guidance with the patient lying on their back.

Lumbar Sympathetic Block

Lumbar sympathetic blocks target the sympathetic chain at the L2–L4 vertebral levels, interrupting sympathetic outflow to the lower extremity. They are used primarily for lower extremity CRPS, peripheral vascular disease pain, and certain phantom limb pain syndromes. The procedure is performed under fluoroscopic guidance with the patient lying face-down.

Common Questions

Frequently Asked Questions

How many sympathetic blocks are needed for CRPS?
Treatment protocols vary, but a series of sympathetic blocks is typically recommended — often 3–6 blocks performed over several weeks. Early treatment is critical, as CRPS that is treated early (within months of onset) responds much better than long-standing CRPS. If sympathetic blocks provide good but temporary relief, more durable treatments such as spinal cord stimulation or DRG stimulation may be considered.
Is sympathetic pain the same as CRPS?
Not exactly. CRPS can have both sympathetically maintained and sympathetically independent components. Sympathetically maintained pain (SMP) refers specifically to the portion of CRPS pain that is relieved by sympathetic blockade. Some CRPS patients are primarily SMP-positive and respond excellently to sympathetic blocks; others have predominantly sympathetically independent pain and require different treatment approaches.
What is the stellate ganglion block used for besides CRPS?
The stellate ganglion block has emerging evidence for post-traumatic stress disorder (PTSD), hot flashes related to menopause or cancer treatment, and certain cardiac arrhythmias. Its use beyond pain medicine is an active area of research. In pain medicine, its primary indications remain upper extremity CRPS and sympathetically maintained neuropathic pain.

Medical Disclaimer: The information on this page is intended for general educational purposes only and does not constitute medical advice. Individual results vary. This is not a substitute for professional medical evaluation, diagnosis, or treatment. Consult Dr. Migdale or another qualified healthcare provider regarding your specific situation.

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