Treatment of Complex Regional Pain Syndrome (CRPS)

First-Line Treatments

• Gentle stretching and mobilization techniques, focusing on increasing external rotation and abduction, are recommended as part of physical therapy for CRPS patients, according to the International Journal of Stroke guidelines 1
• Active range of motion exercises that gradually increase in conjunction with restoring alignment and strengthening weak muscles in the shoulder girdle are suggested for CRPS patients, as per the International Journal of Stroke recommendations 1
• Analgesics such as acetaminophen or ibuprofen can be used for pain relief in CRPS patients, if no contraindications exist, as recommended by the International Journal of Stroke 1

Second-Line Treatments

• The use of sympathetic blocks may be considered to support the diagnosis of sympathetically maintained pain, as suggested by the Anesthesiology (ASA) guidelines 2, 3
• Injections of botulinum toxin into affected muscles can be used when pain is thought to be related to spasticity, according to the International Journal of Stroke recommendations 1
• Subacromial corticosteroid injections can be used when pain is related to injury or inflammation of the subacromial region, as per the International Journal of Stroke guidelines 1

Advanced Treatments for Refractory Cases

• Spinal cord stimulation may be considered for CRPS patients who have not responded to other therapies, as recommended by the Anesthesiology (ASA) guidelines 2, 3
• A spinal cord stimulation trial should be performed before considering permanent implantation of a stimulation device, according to the Anesthesiology (ASA) guidelines 2, 3
• TENS should be used as part of a multimodal approach to pain management, as suggested by the Anesthesiology (ASA) guidelines 2, 3

Clinical Characteristics and Monitoring

• CRPS typically presents with excruciating pain that is made worse by touch or stimulation, as described in the Clinical Infectious Diseases journal 4
• Pain that gradually increases in intensity and size in the affected limb, sometimes spreading to the contralateral limb, is a common characteristic of CRPS, according to the Clinical Infectious Diseases journal 4, 5

Treatment Algorithm

• An early course of oral corticosteroids, starting at 30–50 mg daily for 3–5 days, and then tapering doses over 1–2 weeks can be used to reduce swelling and pain in CRPS patients, as recommended by the International Journal of Stroke 1
• For refractory cases, proceeding to neuromodulation with spinal cord stimulation trial is suggested, as per the Anesthesiology (ASA) guidelines 2, 3
• Implementing TENS as part of a multimodal approach is recommended for refractory CRPS cases, according to the Anesthesiology (ASA) guidelines 2, 3

Important Considerations

• Shared decision-making regarding interventional procedures should include specific discussion of potential complications, as recommended by the Anesthesiology (ASA) guidelines 2, 3

Treatment of Complex Regional Pain Syndrome (CRPS)

Introduction to CRPS Treatment

• Neurostimulation procedures are the most effective treatment for complex regional pain syndrome, with physical therapy as the cornerstone first-line approach 6

Interventional Procedures for CRPS

• Medial branch blocks may be considered for CRPS with cervical involvement, especially when facet-mediated pain is present 7

Clinical Considerations for CRPS

• CRPS often does not respond to placebo except at very early time points (15-30 minutes) 8
• Monitor for common complications including hair loss, tissue changes, and skin discoloration at the pain site 8
• The pain in CRPS is described as excruciating and worsened by touch or stimulation 8

Medical Necessity of Stellate Ganglion Block for CRPS Type 1

Guideline-Based Support for Medical Necessity

• The American Society of Anesthesiologists (ASA) and American Society of Regional Anesthesia and Pain Medicine (ASRA) recommend that lumbar sympathetic blocks or stellate ganglion blocks may be used as components of multimodal treatment of CRPS when used in the presence of consistent improvement and increasing duration of pain relief, with strong consensus among pain management experts 9
• The ASA/ASRA guidelines state that consultants and ASRA members agree and ASA members strongly agree that stellate ganglion blocks should be used for CRPS, representing a high level of evidence-based support 9

Payer Coverage Criteria Alignment

• The patient meets Milliman/MCG criteria, having neuropathic pain from CRPS of upper extremity with symptoms poorly controlled by maximum medical therapy, no coagulopathy, and no contraindications, as supported by the American Society of Anesthesiologists (ASA) 9
• The patient satisfies Aetna criteria, with stellate ganglion block for treatment of CRPS of the hand and arm covered when used as part of a rehabilitation program after failure of standard pharmacotherapies, as recommended by the American Society of Anesthesiologists (ASA) 9

Evidence of Clinical Effectiveness

• The alternating bilateral approach is evidence-based, aligning with clinical practice patterns for optimizing sympathetically maintained pain control, as supported by the American Society of Anesthesiologists (ASA) 9
• The patient's functional outcomes are objectively documented, demonstrating measurable improvements in activities of daily living, cognitive function, autonomic stability, and elimination of temperature dysregulation, as recommended by the American Society of Anesthesiologists (ASA) 9

Standard of Care vs. Experimental Classification

• Stellate ganglion blocks for CRPS have been included in ASA practice guidelines since at least 2010 and remain current in 2025 guideline summaries, establishing this treatment as standard of care, as supported by the American Society of Anesthesiologists (ASA) 9
• The treatment is integrated into a multimodal rehabilitation approach as recommended, not used as monotherapy, as supported by the American Society of Anesthesiologists (ASA) 9

Clinical Pitfalls to Avoid

• The patient's 4-5 month relief duration with consistent improvement supports continued treatment rather than arbitrary cessation, as recommended by the American Society of Anesthesiologists (ASA) 9
• The patient's response pattern confirms the sympathetic component, which is the specific indication for stellate ganglion blocks, as supported by the American Society of Anesthesiologists (ASA) 9
• The case appropriately documents ADL improvements, cognitive function, work capacity, and objective measures beyond numeric pain ratings, which strengthens medical necessity, as recommended by the American Society of Anesthesiologists (ASA) 9

Evidence for Series of Stellate Ganglion Blocks

Guideline-Based Indications for Serial Stellate Blocks

• The American Society of Anesthesiologists (ASA) recommends that stellate ganglion blocks may be used as components of multimodal treatment for Complex Regional Pain Syndrome (CRPS) when there is consistent improvement and increasing duration of pain relief with each successive block, but should not be used for long-term treatment of non-CRPS neuropathic pain 10
• The American Society of Anesthesiologists (ASA) and American Society of Regional Anesthesia and Pain Medicine (ASRA) provide guidance that lumbar sympathetic blocks or stellate ganglion blocks may be used for CRPS if used in the presence of consistent improvement and increasing duration of pain relief 10
• Sympathetic nerve blocks should NOT be used for long-term treatment of non-CRPS neuropathic pain, as recommended by the American Society of Anesthesiologists (ASA) 10
• Peripheral somatic nerve blocks should not be used for long-term treatment of chronic pain, according to the American Society of Anesthesiologists (ASA) 10

Clinical Evidence Supporting Serial Blocks

• The American Society of Anesthesiologists (ASA) recommends that the treatment must be integrated into a multimodal rehabilitation approach, and that stellate ganglion blocks should be used for CRPS, representing a high level of consensus among pain management experts, with the key criterion for continuing a series of stellate blocks being demonstrating progressive improvement with each successive block 10
• The American Society of Anesthesiologists (ASA) suggests that the response pattern should confirm the sympathetic component, which is the specific indication for stellate ganglion blocks, and that objective documentation of functional outcomes is essential, including measurable improvements in activities of daily living, cognitive function, autonomic stability, and elimination of temperature dysregulation 10

Critical Pitfalls to Avoid

• The American Society of Anesthesiologists (ASA) recommends that serial stellate blocks should not be performed for non-CRPS neuropathic pain, as this contradicts ASA/ASRA guidelines, and that blocks should not be continued indefinitely without documented progressive improvement 10
• The American Society of Anesthesiologists (ASA) suggests that failing to document objective functional improvements beyond pain scores weakens medical necessity, and that not recording duration of relief with each successive block makes it impossible to demonstrate the required pattern of "increasing duration" 10

Sympathetically Mediated Pain in the Upper Body: Diagnostic and Therapeutic Considerations

Pathophysiology and Diagnostic Approach

• Altered efferent and afferent signaling, including hormonal regulation and stress-axis signals, contribute to the development of sympathetically mediated pain, as noted by the American Society of Anesthesiologists 11, 12

Treatment Algorithm and Important Clinical Considerations

• The American Society of Anesthesiologists and American Society of Regional Anesthesia and Pain Medicine recommend stellate ganglion blocks as the primary diagnostic and therapeutic intervention for upper extremity SMP, with strong consensus support 11, 12
• Avoid delaying physical therapy while waiting for pain to resolve, as this worsens outcomes through disuse and pain upregulation mechanisms, according to the Clinical Infectious Diseases guidelines 11, 12
• Spinal cord stimulation may be considered for truly refractory cases that have not responded to conservative management and sympathetic blocks, as reported in the Annals of Oncology 13