Uncover effective integrative management practices aimed at alleviating chronic discomfort from neuropathic pain and enhancing life.

Abstract

Welcome. I’m Dr. Alex Jimenez. In this educational post, we will delve into the intricate management of a complex pain case, specifically focusing on severe thoracic neuropathic pain in a patient with a history of shingles and complicated by hospital procedures that led to prolonged pain and debility. This discussion is framed from the perspective of our multidisciplinary team at Injury Medical Clinic PA, where we integrate advanced chiropractic care, functional medicine, regenerative therapies such as PRP, and medical oversight to provide comprehensive patient care. We will explore a real-world patient scenario, detailing the diagnostic and therapeutic journey. Key topics include appropriate opioid selection, the process of opioid rotation, strategies for treating acute-on-chronic pain, the recognition and management of opioid-induced hyperalgesia (OIH), and the progression to advanced therapies like methadone and intrathecal pumps. We will also highlight the crucial roles of adjuvant therapies, regenerative interventions, and collaboration among medical specialties. By examining the latest evidence-based research and clinical insights, we aim to provide a clear roadmap for understanding and treating these challenging conditions. This post will illustrate how our integrated approach, combining the expertise of chiropractic, functional medicine, regenerative medicine, and internal medicine, leads to more effective and holistic patient outcomes.

Our Integrated Care Model: The Team Behind the Treatment

At Injury Medical Clinic PA, also known as Mission Plaza Injury Medical Clinic, in El Paso, Texas, our philosophy is rooted in integrated, patient-centered care. My own background, with credentials as a Doctor of Chiropractic (DC), Advanced Practice Registered Nurse (APRN), and Family Nurse Practitioner (FNP-BC), along with certifications in Functional Medicine (CFMP, IFMCP), allows me to view patient health through multiple lenses. However, true comprehensive care is a team effort.

This is why I am proud to work alongside Dr. Maria Guadalupe Cardenas, MD, a highly respected internist with over 40 years of experience. Dr. Cardenas is Board Certified in Internal Medicine (NPI #1164426749, Texas MD License #J2933) and serves as our Medical Director and Collaborative Physician. Her extensive knowledge and medical oversight are foundational to our practice, ensuring safety, diagnostic accuracy, and appropriate management of complex medical issues like polypharmacy and comorbidity. This multidisciplinary structure, where a medical doctor provides direction alongside chiropractic, functional medicine, and regenerative medicine professionals, is a cornerstone of modern integrative and injury care.

Our team—which includes specialists in chiropractic care, functional medicine, personal injury rehabilitation, physical therapy, and regenerative medicine—collaborates on each case. For a patient like the one we will discuss, this means we are not just treating symptoms in isolation. We are assessing the patient’s entire physiological and biomechanical state. My role often involves using chiropractic adjustments to address musculoskeletal misalignments and nerve interference that can exacerbate pain signals. At the same time, our functional medicine approach seeks to identify and correct underlying biochemical imbalances. Dr. Cardenas provides the essential medical framework, overseeing pharmacological management and ensuring all treatments are safe and cohesive. Regenerative interventions such as ultrasound-guided PRP further enhance this synergy by targeting peripheral tissue and nerve repair. This integrated model allows us to create a truly holistic and effective treatment plan.

Understanding the Patient’s Journey: A Complex Pain Presentation

Let’s explore the case of “DM,” a 70-year-old female who presented to the hospital with a complex medical history and debilitating pain. Her journey provides a powerful example of the challenges and opportunities in managing severe, chronic, and acute neuropathic pain.

Patient Profile:

• History: Prior shingles (herpes zoster) infection, recent right-sided pleural effusion requiring thoracentesis. She developed a pneumothorax (collapsed lung) requiring a chest tube, leading to a prolonged hospital stay. She underwent Video-Assisted Thoracoscopic Surgery (VATS) with pleural biopsy, which revealed chronic inflammatory changes.
• Presenting Problem: Admitted for thoracentesis (pleural fluid drainage), she developed a pneumothorax requiring a chest tube. This led to a prolonged hospital stay.
• Chief Complaint: Significant, worsening right-sided chest pain, which she described as stemming from her prior diagnosis of shingles (herpes zoster).

Her social and family history were also significant, revealing she was a former smoker. A review of systems noted a 20-pound weight loss, anorexia, fatigue, and constipation—symptoms often linked to uncontrolled chronic pain, medication effects, and deconditioning.

Upon examination, she was thin and appeared chronically ill. The most striking finding was tenderness to palpation over the lower right chest and back, following a thoracic dermatomal distribution (T4-T8). A dermatome is an area of skin primarily supplied by a single spinal nerve. Pain along this specific pattern is a classic sign of nerve involvement. The chest tube insertion site was within this same area, and allodynia (pain from light touch) was present.

The Initial Pain Assessment: Unraveling the Neuropathic Nature

Palliative care was consulted on hospital day eight, after a week of attempts to manage her pain and allow the pneumothorax to resolve. On day seven, she had undergone VATS with pleural biopsy, a procedure that further intensified her pain.

When I first met her, the patient described her pain eloquently as “a thousand stinging electric shocks” in that T4-T8 dermatomal pattern. This description is a hallmark of neuropathic pain—pain originating from damage or dysfunction of the nervous system itself, as opposed to nociceptive pain, which arises from tissue injury. Her husband even used the term “post-herpetic neuralgia,” a type of neuropathic pain that can follow a shingles infection. Interestingly, she never had an active characteristic rash at presentation, making the diagnosis more complex but still consistent with post-herpetic neuralgia features (including possible zoster sine herpete).

To conduct a thorough pain assessment, we use the PQRSTU algorithm:

• P (Precipitating/Palliating): The pain was continuous. Nothing seemed to make it better or worse. It began mildly months earlier but had intensified dramatically after her recent procedures.
• Q (Quality): “Severe, thousand stinging electric shocks”—a classic neuropathic description.
• R (Region/Radiation): The pain was localized to the right-sided T4-T8 dermatome and was tender to even light touch (allodynia), another sign of nerve sensitization.
• S (Severity): She rated her pain as a 5-7 out of 10. Her goal was a “tolerable” level of 3 out of 10, a realistic and important target.
• T (Temporal): She was on a Dilaudid (hydromorphone) Patient-Controlled Analgesia (PCA) pump, which provided temporary relief before the severe pain would return.
• U (Impact on You): The pain was so debilitating that she was unable to concentrate, eat, or even walk. It completely controlled her life.

The Initial Treatment Plan: A Multimodal Strategy

When we took over her care, her medication regimen was fragmented. She was on a Dilaudid PCA post-surgery, her home dose of long-acting morphine (MS Contin), and as-needed oxycodone. This is a common scenario, but often suboptimal for controlling complex neuropathic pain. Our first step was to introduce a neuropathic pain agent. The goal was to target the underlying nerve dysfunction directly, not just mask the pain with opioids.

Key Adjuvant Medications for Neuropathic Pain:

• Antiepileptics (AEDs): These drugs, like gabapentin and pregabalin (Lyrica), work by calming overactive nerve signals in the central nervous system.
• Antidepressants (SNRIs and TCAs): Medications such as duloxetine (Cymbalta), venlafaxine (Effexor), and tricyclic antidepressants (amitriptyline, nortriptyline) modulate neurotransmitters (serotonin and norepinephrine) in the brain and spinal cord that contribute to pain perception.
• Topical Agents: For localized pain, lidocaine patches or capsaicin can be effective by desensitizing nerve endings in the skin.

We initiated pregabalin at a low dose (25 mg three times a day), as recommended by Finnerup et al. (2015). We started low because she had previously tried gabapentin and experienced worsening leg edema, a known side effect of this class of drugs. We also scheduled acetaminophen (1000 mg every 8 hours) because scheduled dosing provides a much more stable analgesic foundation than using it “as needed.”

Crucially, we also engaged our multidisciplinary team. Our palliative care chaplain and licensed clinical social worker were brought in to provide spiritual and emotional support, helping her develop coping mechanisms.

Integrating Chiropractic Care and PRP Therapy into the Multimodal Plan

In our clinic, integrative chiropractic care and regenerative medicine shine for patients with thoracic dermatomal neuropathic pain. For patients with thoracic dermatomal pain, I perform a detailed spinal examination to assess for any vertebral subluxations or joint restrictions in the thoracic spine (T4-T8). The reasoning is that biomechanical dysfunction at the spinal level can create or perpetuate nerve irritation.

• Biomechanical Reset: Gentle, specific chiropractic adjustments and mobilization can help restore proper joint mechanics in the facet and costovertebral joints. This reduces peripheral nociceptive input—the “danger” signals sent from the body to the spinal cord. By normalizing motion, we can unload irritated soft tissues and reduce the afferent barrage to the dorsal horn, thereby mitigating the wind-up of central sensitization.
• Neurodynamic and Myofascial Interventions: I also use neurodynamic mobilization for the thoracic and intercostal neural components. This technique gently restores nerve gliding to decrease ectopic firing from irritated nerves. Myofascial release and trigger-point strategies downregulate muscle spindle hyperexcitability and improve local perfusion, thereby further reducing pain signals.

Regenerative PRP Therapy as a Key Adjunct

Complementing the biomechanical work, we incorporated ultrasound-guided Platelet-Rich Plasma (PRP) therapy targeting the affected T4-T8 nerve roots, paravertebral musculature, and facet joints. PRP is prepared from the patient’s own blood and concentrated to deliver high levels of autologous growth factors (including PDGF, TGF-β, VEGF, and others). These bioactive components help:

• Modulate the local neuroinflammatory environment that sensitizes peripheral nerves.
• Promote tissue repair and reduce perineural fibrosis or scarring that can mechanically irritate nerve roots.
• Support nerve gliding and regeneration to enhance the benefits of chiropractic neurodynamic techniques.
• Provide an opioid-sparing effect by directly addressing peripheral pain generators and improving the tissue environment for healing.

This combined chiropractic + PRP approach reduces the peripheral “noise” so that central pain processing can reset more effectively, while also supporting long-term structural and neural recovery. It fits seamlessly into our multimodal strategy and aligns with the regenerative capabilities of our practice for complex neuropathic and musculoskeletal pain conditions.

Complications and Course Correction: The Neurology Consult

Unfortunately, her symptoms progressed. While her pain initially improved slightly, she developed dizziness, confusion, and tremors. We suspected the pregabalin was the cause and discontinued it, switching to low-dose amitriptyline.

At this point, another specialty became involved. The primary medical team consulted neurology due to the new neurological symptoms. This highlights a common challenge in hospital settings: multiple specialists can sometimes work in silos. The neurology team, unaware of our reasoning, switched her back to pregabalin and added lidocaine patches. Predictably, her tremors and confusion returned, and her pain escalated.

Her pain management was further complicated when the PCA was discontinued per hospital protocol, and she was transitioned to as-needed oral Dilaudid. This intermittent dosing was insufficient for her severe, continuous neuropathic pain.

Then came a pivotal moment in clarifying her condition: the pleural biopsy results returned, revealing chronic inflammatory changes. Combined with her history of shingles and the classic dermatomal electric-shock pain with allodynia, this supported a diagnosis of severe thoracic post-herpetic neuralgia (with features of zoster sine herpete) and significant central sensitization. Her pain was not just post-surgical or post-procedural; it involved persistent nerve dysfunction in the T4-T8 distribution, perpetuated by both inflammatory and mechanical factors from thoracic spinal joint dysfunction and nerve root irritation. Her functional status had declined markedly due to uncontrolled pain and deconditioning, requiring substantial assistance with daily activities.

Movement Medicine: Chiropractic Care- Video

Optimizing Opioids: The Art of Opioid Rotation

With the clarified understanding of her severe neuropathic pain and her pain spiraling out of control, it was time to re-evaluate her opioid regimen. She was experiencing neurotoxicity (confusion, tremors) and inadequate analgesia. This is a classic indication for opioid rotation.

Opioid rotation is the process of switching from one opioid to another to achieve a better balance between pain relief (analgesia) and side effects. As Mercadante & Bruera (2016) explain, patients can develop tolerance to one opioid’s analgesic effects while remaining sensitive to its adverse effects. Switching to a different opioid can restore pain control, often at a lower equivalent dose, because of incomplete cross-tolerance between different opioids.

How to Calculate an Opioid Rotation:

1. Calculate the Total Daily Opioid Dose: Add up all opioids the patient has taken over the last 24 hours.
2. Convert to Oral Morphine Milligram Equivalents (MME): Use a standard conversion table to convert each opioid to its oral morphine equivalent. This creates a common currency for comparison.
3. Reduce the Dose for Incomplete Cross-Tolerance: When switching to a new opioid, it is crucial to reduce the calculated MME dose by 25-50%. This safety measure accounts for the fact that a patient may be more sensitive to the new drug.
4. Convert to the New Opioid: Convert the reduced MME dose to the desired new opioid.
5. Establish Long-Acting and Short-Acting Doses: The new total daily dose is typically split into a long-acting (scheduled) medication for baseline pain and a short-acting (as-needed) medication for breakthrough pain (usually 10-15% of the total daily dose).

Understanding Opioid-Induced Hyperalgesia

As her pain worsened despite dose escalation, we had to consider another phenomenon: Opioid-Induced Hyperalgesia (OIH). OIH is a neurotoxic state where opioids paradoxically increase pain sensitivity. It presents as worsening pain despite dose escalation, diffuse pain extension, and allodynia (pain from a non-painful stimulus). As described by Angst & Clark (2006), it is not the same as tolerance.

Physiological Underpinnings of OIH:

• NMDA Receptor Activation: Opioids can paradoxically stimulate NMDA receptors in the spinal cord, which amplifies pain signals and leads to central sensitization.
• Spinal Dynorphin Upregulation: This endogenous kappa-opioid ligand can increase excitatory neurotransmission within dorsal horn circuits.
• Descending Facilitation: The brainstem’s rostral ventromedial medulla can begin to amplify pain processing rather than inhibit it.
• Toxic Metabolites: Accumulation of metabolites such as morphine-3-glucuronide can increase neuroexcitability.

Recognizing OIH is critical because the intuitive response—increasing the opioid dose—only worsens the condition. The correct management involves opioid rotation, dose reduction, and maximizing non-opioid adjuvant therapies (including chiropractic and PRP interventions).

Clinical Scenario: Building an Evidence-Based Opioid Plan

Based on these principles, we implemented a new plan. Her average daily opioid use was approximately 70 MME. We structured her regimen to provide stable baseline coverage with options for breakthrough pain:

• Long-acting morphine 30 mg every 12 hours (total 60 mg/day—about 80% of her daily need).
• Oxycodone 10 mg PO every four hours as needed (PRN) for breakthrough pain.
• Nortriptyline increased from 10 mg to 25 mg nightly for better neuropathic modulation.
• Carbamazepine 200 mg twice daily was chosen as an alternative AED due to her intolerance to gabapentinoids.
• Dexamethasone 4 mg IV twice daily was added to reduce inflammation and nausea, and to stimulate appetite.

Despite these changes, she developed hallucinations. We identified dronabinol (which had been previously ordered) as a probable contributor and stopped it; the hallucinations resolved. This highlights the importance of de-prescribing in complex polypharmacy.

Why Methadone When Other Options Fail: Physiology and Clinical Strategy

Even with an optimized regimen, her pain remained difficult to control, with requirements escalating significantly. This led us to consider methadone. Methadone is a powerful option for mixed nociceptive and neuropathic pain due to its unique pharmacology.

• Dual Mechanism: Methadone is a mu-opioid receptor agonist, providing strong analgesia. Uniquely, it is also an NMDA receptor antagonist, which directly counters the central sensitization and OIH that were likely contributing to her pain (Chou et al., 2014).
• High Lipophilicity: It rapidly crosses the blood-brain barrier.
• Long Half-Life: It provides sustained pain relief but requires slow, careful titration to avoid accumulation and toxicity.
• No Toxic Metabolites: Unlike morphine, it does not produce active toxic metabolites, making it a safer option in patients with renal impairment.

Clinical Cautions with Methadone:

• QTc Prolongation Risk: Methadone can prolong the QTc interval on an ECG, increasing the risk of a dangerous heart rhythm. We monitor with baseline and follow-up ECGs and avoid it if QTc is >450 ms.
• Slow Titration: Because of its long half-life, doses are increased no more than every 4-7 days to prevent toxic accumulation.

We initiated methadone at 5 mg every 8 hours, titrating to 10 mg every 8 hours after four days. We tapered her IV hydromorphone PCA as the methadone took effect. This is consistent with my clinical observations that methadone’s NMDA antagonism can significantly reduce central sensitization and improve pain quality when other opioids fail. Throughout this phase, ongoing chiropractic care and planned regenerative PRP follow-up helped address mechanical and peripheral inflammatory contributors, supporting more stable pain control.

When to Consider an Intrathecal Pain Pump: Targeted Microdosing

Despite improvement, the daily management burden was high. We then discussed an intrathecal pain pump. This device delivers microdoses of medication directly into the subarachnoid space of the spinal cord, acting on spinal pain receptors.

• Why It Helps: As outlined in the Polyanalgesic Consensus Conference guidelines (Deer et al., 2017), it provides potent analgesia with a fraction of the systemic dose, dramatically reducing side effects. It is especially effective for dermatomal pain like our patient’s, as it targets the specific spinal segments involved.
• Dose Sparing: The conversions are profound. For example, about 100 mg of IV morphine is equivalent to just 1 mg of intrathecal morphine.

She was selected as a candidate, and an intrathecal hydromorphone pump was implanted. We set a basal rate of 0.25 mg/hour with a 0.04 mg bolus available every 6 hours. This allowed us to wean her off the PCA and taper her methadone, achieving tolerable pain control with minimal systemic effects. The combination of targeted pharmacological delivery, prior optimization of adjuvants, chiropractic biomechanical support, and regenerative PRP groundwork contributed to successful weaning and sustained comfort.

Palliative Psychosocial-Spiritual Care: The Human Foundations of Pain Control

Throughout this journey, our licensed clinical social worker and chaplains were instrumental. Pain is not just a physical sensation; it is deeply connected to a person’s biography, beliefs, and relationships. They helped the patient and her family navigate:

• Spiritual distress: Finding meaning and hope.
• Moral distress: Aligning treatment choices with personal values.
• Social distress: Improving communication and managing family expectations.
• Legacy-building: Crafting meaningful messages and memories for her family.

These interventions are critical. They reduce limbic system activation, lower stress hormones, and diminish pain catastrophizing, which improves a patient’s ability to cope and adhere to complex treatments.

Final Course and Clinical Takeaways

The patient was discharged home on hospital day 45 with home health support and a robust outpatient multidisciplinary plan. Her pain was well-controlled, and she had regained the ability to eat for pleasure and engage in light activities. She expressed deep gratitude for the comprehensive care that restored her comfort and quality of life.

Practical Takeaways from this Case:

• Suspect OIH when pain worsens with opioid dose escalation; pivot to opioid rotation and maximize adjuvant therapies.
• Lean into multimodal analgesia, using TCAs/SNRIs, AEDs, scheduled non-opioids, chiropractic care, and regenerative interventions like PRP to reduce reliance on high-dose opioids.
• Methadone is an excellent option for mixed neuropathic-nociceptive pain and suspected OIH due to its NMDA receptor antagonism, but requires slow titration and QTc monitoring.
• Intrathecal pumps offer targeted, potent analgesia with minimal systemic side effects for intractable dermatomal neuropathic pain.
• Integrate chiropractic care early to reduce peripheral nociceptive drivers, restore biomechanical function, and support central nervous system regulation through adjustments, mobilizations, and neurodynamic techniques.
• Incorporate regenerative PRP therapy (ultrasound-guided perineural, paravertebral, and facet injections) to address inflammatory and mechanical contributors to nerve irritation, promote tissue and nerve repair, and enhance outcomes of chiropractic and pharmacological treatments.
• True comprehensive care is multidisciplinary, requiring collaboration between medicine, chiropractic, functional medicine, regenerative therapies, and psychosocial support to address the whole person and optimize long-term function and quality of life.

At Injury Medical Clinic PA, Dr. Cardenas and I coordinate closely on every complex case. She ensures medical rigor and safety, while I lead the implementation of integrative chiropractic, functional medicine, regenerative procedures (including PRP), and rehabilitation. This unified model provides a pathway toward safer, more effective relief for patients facing the most challenging pain conditions.

Dr. Alex Jimenez, DC, APRN, FNP-BC, CFMP, IFMCP, ATN, CCST wrote this educational post. The information presented reflects the latest findings from leading researchers and illustrates the integrated care model practiced at Injury Medical Clinic PA in El Paso, Texas.

References

1. Angst, M. S., & Clark, J. D. (2006). Opioid-induced hyperalgesia: a qualitative systematic review. Anesthesiology, 104(3), 570–587.
2. Chou, R., Cruciani, R. A., Fiellin, D. A., Compton, P., Farrar, J. T., Haigney, M. C., … & American Pain Society. (2014). Methadone safety: a clinical practice guideline from the American Pain Society and College on Problems of Drug Dependence, in collaboration with the Heart Rhythm Society. The Journal of Pain, 15(4), 321–337.
3. Davis, M. P. (2012). Drug management of cancer pain. The Lancet Oncology, 13(5), e233–e241. (Principles of advanced opioid and multimodal management applied to severe chronic neuropathic pain.)
4. Deer, T. R., Pope, J. E., Hayek, S. M., Bux, A., Buchser, E., Eldabe, S., … & Polyanalgesic Consensus Conference (2017). The Polyanalgesic Consensus Conference (PACC): recommendations for intrathecal drug delivery: guidance for improving safety and mitigating risks. Neuromodulation: Technology at the Neural Interface, 20(2), 155-176.
5. Finnerup, N. B., Attal, N., Haroutounian, S., McNicol, E., Baron, R., Dworkin, R. H., … & Wallace, M. (2015). Pharmacotherapy for neuropathic pain in adults: a systematic review and meta-analysis. The Lancet Neurology, 14(2), 162–173.
6. Mercadante, S., & Bruera, E. (2016). Opioid switching in cancer pain: From theory to practice. Current Opinion in Supportive and Palliative Care, 10(2), 113–118. (Opioid rotation principles applied to refractory neuropathic pain.)
7. Navari, R. M., & Aapro, M. S. (2016). Antiemetic prophylaxis for chemotherapy-induced nausea and vomiting. New England Journal of Medicine, 374(14), 1356–1367. (Anti-inflammatory and supportive medication principles referenced.)
8. Snodgrass, B. (n.d.). A Complex Pain Case: Opioid and Adjuvant Management. [Conference Presentation].

Clinical Observations and Resources

For more on my clinical perspectives and case-based insights:

• https://sciatica.clinic/
• https://www.linkedin.com/in/dralexjimenez/

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