Rate and Predictors of Patients with Chronic Pain Establishing Care with Pain Psychology Following Pain Physician Referral.

OBJECTIVE: To determine, among patients with chronic pain who had received pain physician referral to pain psychology, the rate of establishing care and factors related to establishing care with pain psychology. DESIGN: Retrospective study. SETTING: Academic tertiary care center. SUBJECTS: Patients from the University of California, San Diego (UCSD) Center for Pain Medicine. METHODS: This was an institutional review board-approved, retrospective study of 150 consecutive referrals of unique patients from UCSD Pain Medicine to UCSD Pain Psychology. RESULTS: Of 150 patients referred to pain psychology, 74 (49.3%) established care with pain psychology. Of 98 patients who had previously seen mental health services, 58 established care with pain psychology (59.2%; 95% confidence interval [CI]: 49% to 69%), whereas of 52 patients who had not previously seen mental health services, 16 established care with pain psychology (30.8%; 95% CI: 18% to 43%) (odds ratio [OR] 3.26; 95% CI: 1.60 to 6.66). In the patient subset with depression and/or anxiety, of 82 patients who had previously seen mental health services, 47 established care with pain psychology (57.3%; 95% CI: 47% to 68%), whereas of 20 patients who had not previously seen mental health services, three established care with pain psychology (15%; 95% CI: -1% to 31%) (OR 7.61; 95% CI: 2.07 to 28.01). Of 96 patients referred for general pain psychology evaluations, 43 established care (45%; 95% CI: 35% to 55%), whereas of 38 patients referred for preprocedural evaluation for an implantable device, 24 established care (63%; 95% CI: 48% to 78%). CONCLUSION: Patients are significantly more likely to establish care with pain psychology if they have previously seen a mental health professional. This was even more marked among the patient subset with a history of depression and/or anxiety who had engaged in mental health services than among those with a history of depression and/or anxiety who had not engaged in mental health services. Whether referral was for general psychological evaluation or preprocedural evaluation for an implantable device did not significantly influence whether patients established care. Targeted interventions are needed to improve the likelihood of patients engaging with pain psychology services.

Use of spinal cord stimulation in treatment of intractable headache diseases.

Headache diseases remain one of the leading causes of disability in the world. With the development of neuromodulation strategies, high cervical spinal cord stimulation (hcSCS) targeting the trigeminocervical complex has been deployed to treat refractory headache diseases. In this article, we review the proposed mechanism behind hcSCS stimulation, and the various studies that have been described for the successful use of this treatment strategy in patients with chronic migraine, cluster headache, and other trigeminal autonomic cephalalgias.

Occipital Headache Evaluation and Rates of Migraine Assessment, Diagnosis, and Treatment in Patients Receiving Greater Occipital Nerve Blocks in an Academic Pain Clinic.

OBJECTIVE: Diagnosis of patients with occipital headache can be challenging, as both primary and secondary causes must be considered. Our study assessed how often migraine is screened for, diagnosed, and treated in patients receiving greater occipital nerve blocks (GONBs) in a pain clinic. DESIGN: Institutional review board-approved, retrospective observational study. SETTING: Academic multidisciplinary pain clinic. SUBJECTS: One hundred forty-three consecutive patients who received GONBs. RESULTS: About 75% of patients had been evaluated by neurologists and about 25% by non-neurologist pain specialists only, and 62.2% of patients had photophobia, phonophobia, and nausea assessed. Compared with patients who had been evaluated by non-neurologists, patients who had been evaluated by a neurologist were more likely to have photophobia, phonophobia, and nausea assessed (75.9% vs 20.0%, odds ratio [OR] 12.6, 95% confidence interval [CI] 4.90 to 32.2); more likely to be diagnosed with migraine (48.1% vs 14.3%, OR 5.6, 95% CI 2.0 to 15); less likely to be diagnosed with occipital neuralgia (39.8% vs 65.7%, OR 0.3, 95% CI 0.2 to 0.8); and equally likely to be diagnosed with cervicogenic headache (21.3% vs 25.7%, OR 0.8, 95% CI 0.3 to 1.9). Among patients diagnosed with migraine, 82.5% received acute migraine treatment, 89.5% received preventive migraine treatment, and 52.6% were documented as receiving migraine lifestyle counseling. CONCLUSIONS: Of the patients in this study who had occipital headache and received GONBs, 62.2% were assessed for migraine, and most received appropriate acute, preventive, and lifestyle treatments when diagnosed. Patients seen by neurologists were significantly more likely to be screened for and diagnosed with migraine than were those evaluated by non-neurologist pain medicine specialists only. All clinicians should remain vigilant for migraine in patients with occipital headache.

Percutaneous Interventional Strategies for Migraine Prevention: A Systematic Review and Practice Guideline.

OBJECTIVE: To systematically evaluate the efficacy and effectiveness of percutaneous interventional treatments for prevention of migraine through a qualitative and (when possible) quantitative analysis. METHODS: An expert panel was asked to develop recommendations for the multidisciplinary preventive treatment of migraine, including interventional strategies. The committee conducted a systematic review and (when evidence was sufficient) a meta-analytic review by using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) criteria and the modified Cochrane Risk of Bias analysis available in the Covidence data management program. Clinical questions addressed adults with migraine who should be offered prevention. Examined outcomes included headache days, acute medication use, and functional impairment. Acute management of migraine was outside the scope of this guideline. RESULTS: The committee screened 1,195 studies and assessed 352 by full text, yielding 16 randomized controlled trials that met the inclusion criteria. RECOMMENDATIONS AND CONCLUSIONS: As informed by evidence related to the preselected outcomes, adverse event profile, cost, and values and preferences of patients, onabotulinumtoxinA received a strong recommendation for its use for chronic migraine prevention and a weak recommendation against its use for episodic migraine prevention. Greater occipital nerve blocks received a weak recommendation for their use for chronic migraine prevention. For greater occipital nerve block, steroid received a weak recommendation against its use vs the use of local anesthetic alone. Occipital nerve with supraorbital nerve blocks, sphenopalatine ganglion blocks, cervical spine percutaneous interventions, and implantable stimulation all received weak recommendations for their use for chronic migraine prevention. The committee found insufficient evidence to assess trigger point injections in migraine prevention and highly discouraged the use of intrathecal medication.

The Effectiveness of Intraosseous Basivertebral Nerve Radiofrequency Neurotomy for the Treatment of Chronic Low Back Pain in Patients with Modic Changes: A Systematic Review.

OBJECTIVE: Determine the effectiveness of intraosseous basivertebral nerve radiofrequency neurotomy for the treatment of chronic low back pain with type 1 or 2 Modic changes. DESIGN: Systematic review. POPULATION: Persons aged ≥18 years with chronic low back pain with type 1 or 2 Modic changes. INTERVENTION: Intraosseous basivertebral nerve radiofrequency neurotomy. COMPARISON: Sham, placebo procedure, active standard care treatment, or none. OUTCOMES: The primary outcome of interest was the proportion of individuals with ≥50% pain reduction. Secondary outcomes included ≥10-point improvement in function as measured by Oswestry Disability Index as well as ≥2-point reduction in pain score on the Visual Analog Scale or Numeric Rating Scale, and decreased use of pain medication. METHODS: Three reviewers independently assessed publications before May 15, 2020, in MEDLINE and Embase and the quality of evidence was evaluated using the Grades of Recommendation, Assessment, Development, and Evaluation framework. RESULTS: Of the 725 publications screened, seven publications with 321 participants were ultimately included. The reported 3-month success rate for ≥50% pain reduction ranged from 45% to 63%. Rates of functional improvement (≥10-point Oswestry Disability Index improvement threshold) ranged from 75% to 93%. For comparison to sham treatment, the relative risk of treatment success defined by ≥50% pain reduction and ≥10-point Oswestry Disability Index improvement was 1.25 (95% confidence interval [CI]: .88-1.77) and 1.38 (95% CI: 1.10-1.73), respectively. For comparison to continued standard care treatment the relative risk of treatment success defined by ≥50% pain reduction and ≥10-point Oswestry Disability Index improvement was 4.16 (95% CI: 2.12-8.14) and 2.32 (95% CI: 1.52-3.55), respectively. CONCLUSIONS: There is moderate-quality evidence that suggests this procedure is effective in reducing pain and disability in patients with chronic low back pain who are selected based on type 1 or 2 Modic changes, among other inclusion and exclusion criteria used in the published literature to date. Success of the procedure appears to be dependent on effective targeting of the BVN. Non-industry funded high-quality, large prospective studies are needed to confirm these findings.

Cluster-status migrainosus with a weekly periodicity responsive to high-flow oxygen: A case report.

BACKGROUND: There are cases in the headache literature described as "cluster-migraine," but none of stereotyped cases of cluster headache evolving into status migrainosus. We believe this is the first documented case of "cluster-status migrainosus". CASE: A 54 year-old female hospital administrator presented with headaches with a unique periodicity and semiology that were acutely responsive to high-flow oxygen. She experienced cluster headache attacks every Thursday morning at 3-4 am, which would evolve into status migrainosus lasting through Sunday evening. These attacks were preceded by prodromal depressed mood changes and fluid retention, and later followed by postdromal euphoria and auto-diuresis. These attacks initially occurred every other week and progressed to weekly attacks for 1.5 years. These headaches did not respond to trials of propanolol, sodium valproate, topiramate, amitriptyline, gabapentin, and carbamazepine for preventive treatment or to oral sumatriptan and butalbital-acetaminophen-caffeine for acute treatment. We started her on high-flow 100% oxygen for cluster headache, which successfully aborted greater than 80% of her weekly cluster headache attacks and prevented them from evolving into status migrainosus. CONCLUSION: We believe this is the first case of "cluster-status migranosus" described in the medical literature. High-flow oxygen both aborted the cluster headaches and prevented the ensuing status migrainosus.

Headache and Barometric Pressure: a Narrative Review.

PURPOSE OF REVIEW: Alterations in atmospheric pressure have been long associated with headaches. The purpose of this review article is to investigate the association of barometric pressure with headache, classifying into two broad categories primary headache disorders (barometric pressure triggering migraine or tension-type headache) and secondary headache disorders (barometric pressure triggering high-altitude headache and headache attributed to airplane travel), discussing the pathophysiology and possible treatments. RECENT FINDINGS: Multiple studies have been performed with inconsistent results regarding the directionality of the association between atmospheric pressure changes and triggering of primary headache disorders, chiefly headaches. Atmospheric pressure is also a trigger of two secondary headache disorders, i.e., high-altitude headache and headache attributed to airplane travel. Hypothesized mechanisms include excitation of neurons in trigeminal nucleus, central and peripheral vasoconstriction, barotrauma, and hypoxia. There are no randomized clinical trials regarding effective acute or preventive treatments. Greater understanding of pathophysiology may enable both acute and preventive treatments for headaches triggered by changes in barometric pressure. Further studies on the subject are needed.

Relapsing Painful Ophthalmoplegic Neuropathy: No longer a "Migraine," but Still a Headache.

PURPOSE OF REVIEW: Recurrent painful ophthalmoplegic neuropathy (RPON), formerly known as ophthalmoplegic migraine, is an uncommon disorder with repeated episodes of ocular cranial nerve neuropathy associated with ipsilateral headache. This review discusses the clinical presentation, current understanding of the pathophysiology, key differential diagnoses, and evaluation and treatment of RPON. RECENT FINDINGS: The literature is limited due to the rarity of the disorder. Recent case reports and series continue to suggest the age of first attack is most often during childhood or adolescence as well as a female predominance. Multiple recent case reports and series demonstrate focal enhancement of the affected cranial nerve, as the nerve root exits the brainstem. This finding contributed to the current classification of the disorder as a neuropathy, with the present understanding that it is due to a relapsing-remitting inflammatory or demyelinating process. The link to migraine remains a cause of disagreement in the literature. RPON is a complex disorder with features of inflammatory neuropathy and an unclear association with migraine. Regardless, the overall prognosis is good for individual episodes, but permanent nerve damage may accumulate with repeated attacks. A better understanding of the pathogenesis is needed to clarify whether it truly represents a single disorder and to guide its treatment. Until that time, a combined approach with acute and preventive therapies can mitigate acute symptoms as well as attempt to limit recurrence of this disabling syndrome.

Emerging treatments for the primary headache disorders.

Migraine and cluster headache are common, episodic, often chronic and disabling disorders of the brain. Although there are many standard treatment techniques, none are ideal. This article reviews various novel pharmacologic and device-related treatments for migraine and cluster headache. Emphasis is given to recent advances in the development of monoclonal antibodies (mAbs) targeting calcitonin gene-related peptide (CGRP) and its receptor, including promising results from phase 2 trials studying the safety and efficacy of LY2951742, ALD403 and TEV-48125, three anti-CGRP mAbs. Other new pharmacologic treatments discussed include the 5-HT1F receptor agonist lasmiditan and glial cell modulator ibudilast. Also reviewed is neuromodulation for migraine and cluster headache, including promising recent results of randomized controlled trials studying sphenopalatine ganglion stimulation, trigeminal nerve stimulation, transcutaneous vagus nerve stimulation, and transcranial magnetic stimulation. Finally, we discuss patch, inhaled, and intranasal methods of triptan and dihydroergotamine delivery.

Subcutaneous Oxytocin Injection Reduces Heat Pain: A Randomized-Controlled Trial.

Oxytocin (OT) is a neuropeptide broadly implicated in social relationships and behavior. OT also exerts antinociceptive and pain-reducing effects in both humans and rodents. Recent research in rodents demonstrates that these effects can be peripheral and local. In human studies, intravenous OT has reduced visceral pain, and subcutaneous injection of OT has reduced postsurgical pain. However, the local effects of subcutaneous OT on experimental pain have not been studied. We conducted a 2-session crossover study during which healthy adults received a subcutaneous injection of synthetic OT (4 mcg/2 mL) or saline placebo (isotonic saline 2 mL), in a randomized and double-blinded manner. Eighteen participants completed full study procedures. We hypothesized that 10 minutes after injection, OT would reduce measures of acute mechanical pain, pressure pain, and heat pain perception. Subcutaneous OT significantly reduced ratings of heat pain intensity and unpleasantness (both P < .01), but did not alter mechanical pain, pressure pain, or heat pain threshold (all P > .05). Changes in heat pain were observed only on the injected arm and not on the contralateral arm, confirming a localized mechanism. These findings confirm the ability of OT in or near the skin to modulate nociceptive processes in cutaneous tissues in human adults, opening exciting avenues for further mechanistic research as well as potential clinical applications for acute pain. PERSPECTIVE: This randomized-controlled trial showed that a subcutaneous injection of OT could reduce perception of heat pain tested with a thermode. OT did not alter mechanical or pressure pain or thresholds for perceiving heat pain. These findings are relevant to scientists and clinicians seeking nonaddictive local drug treatments for pain.