A stellate ganglion block is a precision interventional procedure that targets the stellate ganglion — a fusion of the inferior cervical and first thoracic sympathetic ganglia located at the base of the neck, anterior to the C7 transverse process and the neck of the first rib. This ganglion serves as a critical relay station for the sympathetic nerve fibers that innervate the head, face, neck, and upper extremity. By delivering local anesthetic directly to this structure, the procedure temporarily interrupts the efferent sympathetic outflow, effectively breaking the pathologic pain cycle maintained by sympathetic nervous system hyperactivity.
The primary indication for stellate ganglion block is complex regional pain syndrome (CRPS) involving the upper extremity, a condition characterized by severe burning pain, allodynia, vasomotor instability, sudomotor changes, and trophic alterations that extend well beyond a single nerve distribution. Beyond CRPS, the procedure is highly effective for sympathetically maintained pain from various causes, Raynaud's phenomenon and syndrome with digital ischemia, phantom limb pain, post-herpetic neuralgia involving the trigeminal or cervical dermatomes, hyperhidrosis, and — increasingly recognized — post-traumatic stress disorder (PTSD), where disruption of the sympathetic hyperarousal state can produce clinically meaningful improvement in symptoms.
At Interventional Pain Consultants, stellate ganglion blocks are performed under real-time fluoroscopic or ultrasound guidance by board-certified, fellowship-trained interventional pain specialists. The use of image guidance and meticulous attention to anatomic detail are essential to minimize the risk of complications, which include intravascular injection, vertebral artery injury, recurrent laryngeal nerve block, brachial plexus block, pneumothorax, and epidural or intrathecal spread. Despite these potential risks, the procedure has a well-established safety record when performed by experienced practitioners in an appropriate clinical setting.
The patient is positioned supine with the neck slightly extended and the head rotated away from the side to be injected. Using fluoroscopic guidance in an anteroposterior view, the C7 vertebral body is identified by its characteristic long, downward-sloping transverse process (distinct from the C6 transverse process, which bears the easily identifiable carotid tubercle, or Chassaignac's tubercle). The skin entry point is marked over the anterolateral neck at the level of C7, just lateral to the trachea and medial to the carotid sheath.
After sterile preparation and administration of a small volume of subcutaneous lidocaine, a 25-gauge needle is advanced under continuous fluoroscopic guidance toward the anterior surface of the C7 transverse process. Once bony contact is made, the needle is withdrawn approximately 1-2 mm to ensure the tip lies within the prevertebral fascia. Negative aspiration is performed to rule out vascular puncture, and a small test dose of contrast medium is injected to confirm appropriate prevertebral spread pattern — a smooth, linear, longitudinal contrast column tracking along the anterior surface of the longus colli muscle confirms correct needle tip position. Once confirmed, 5-10 mL of 0.25% bupivacaine is incrementally injected.
The procedure is performed on an outpatient basis and typically requires 15-20 minutes of procedure time. The patient is awake during the procedure but may receive mild sedation if needed for anxiety. Successful blockade of the stellate ganglion produces a predictable constellation of findings known as Horner's syndrome on the ipsilateral side: ptosis (drooping of the upper eyelid), miosis (pupillary constriction), anhidrosis (absence of sweating), and nasal congestion with conjunctival injection. These signs confirm that the sympathetic chain has been adequately blocked and typically resolve completely within 4-8 hours as the local anesthetic is metabolized.
Patients may also notice a transient change in voice quality due to blockade of the recurrent laryngeal nerve (which lies in close proximity to the stellate ganglion), a sensation of warmth and vasodilation in the ipsilateral upper extremity, and visible improvement in skin color and temperature. These effects are expected, temporary, and reassuring indicators of a technically successful block.
Patients are monitored in a recovery area for 20-30 minutes following the procedure. The Horner's syndrome and voice changes typically resolve within 4-8 hours as the local anesthetic wears off. Patients should not drive themselves home following the procedure and should avoid operating heavy machinery for 24 hours. Most patients can return to normal activities the following day.
A therapeutic course typically involves a series of 4-6 stellate ganglion blocks performed at weekly intervals. The response to each block is carefully documented, including the degree and duration of pain relief, changes in vasomotor tone, and functional improvements in the affected extremity. Patients who demonstrate significant but short-lived relief may be candidates for pulsed radiofrequency ablation of the stellate ganglion or, in selected cases, continuous radiofrequency or chemical neurolysis.
Stellate ganglion blocks are most effective in patients whose pain has a demonstrable sympathetically maintained component — identified by features such as burning quality, allodynia that extends beyond a single nerve territory, vasomotor changes (temperature asymmetry, color changes, edema), and a positive response to a diagnostic phentolamine infusion or prior sympathetic block. Early intervention is critical, particularly in CRPS, where delays in diagnosis and treatment are associated with poorer outcomes and progression to advanced disease stages.
Contraindications include coagulopathy or therapeutic anticoagulation that cannot be safely interrupted, contralateral phrenic nerve palsy or vocal cord paralysis (bilateral blockade could cause respiratory compromise), preexisting Horner's syndrome on the contralateral side, active infection at the injection site, and patient refusal or inability to cooperate with the procedure. At Interventional Pain Consultants, we perform all sympathetic blocks under continuous image guidance with immediate availability of resuscitation equipment and medications, ensuring the highest standard of procedural safety.
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