Concurrent Bell's Palsy and Facial Pain Improving
with Multimodal Chiropractic Therapy:
A Case Report and Literature ReviewThis section is compiled by Frank M. Painter, D.C.
Send all comments or additions to: Frankp@chiro.org
FROM: Am J Case Rep 2022 (Sep 19); 23: e937511 ~ FULL TEXT
OPEN ACCESS Eric Chun-Pu Chu, Robert J Trager, Alan Te-Chang Chen
New Chiropractic and Physiotherapy Centre,
EC Healthcare,
Kowloon, Hong Kong.
BACKGROUND Bell's palsy, also called facial nerve palsy, occasionally co-occurs with trigeminal neuropathy, which presents as additional facial sensory symptoms and/or neck pain. Bell's palsy has a proposed viral etiology, in particular when occurring after dental manipulation.
CASE REPORT A 52-year-old Asian woman presented to a chiropractor with a 3-year history of constant neck pain and left-sided maxillary, eyebrow, and temporomandibular facial pain, paresis, and paresthesia, which began after using a toothpick, causing possible gum trauma. She had previously been treated with antiviral medication and prednisone, Chinese herbal medicine, and acupuncture, but her recovery plateaued at 60% after 1 year. The chiropractor ordered cervical spine magnetic resonance imaging, which demonstrated cervical spondylosis, with no evidence of myelopathy or major pathology. Treatment involved cervical and thoracic spinal manipulation, cervical traction, soft-tissue therapy, and neck exercises. The patient responded positively. At 1-month follow-up, face and neck pain and facial paresis were resolved aside from residual eyelid synkinesis. A literature review identified 12 additional cases in which chiropractic spinal manipulation with multimodal therapies was reported to improve Bell's palsy. Including the current case, 85% of these patients also had pain in the face or neck.
CONCLUSIONS This case illustrates improvement of Bell's palsy and concurrent trigeminal neuropathy with multimodal chiropractic care including spinal manipulation. Limited evidence from other similar cases suggests a role of the trigeminal pathway in these positive treatment responses of Bell's palsy with concurrent face/neck pain. These findings should be explored with research designs accounting for the natural history of Bell's palsy.
Keywords: Bell Palsy, Chiropractic, Manipulation, Spinal, Musculoskeletal Manipulations, Neck Pain, Trigeminal Nerve Diseases
From the Full-Text Article:
Background
Bell’s palsy, also called cranial nerve VII or facial nerve palsy, is a sudden-onset facial weakness with several potential triggers. Co-occurrence of facial nerve palsy with another cranial neuropathy, termed cranial polyneuritis, may be relatively common, with the trigeminal nerve potentially being the most common comorbid cranial neuropathy. [1] While cranial nerve VII is predominantly a motor nerve, co-involvement of the trigeminal nerve, which has a broad sensory distribution, may lead to pain and/or sensory deficits. [1–3]
While an overt presentation of trigeminal neuralgia (ie, brief shock-like paroxysmal pain) is rarely reported among those with Bell’s palsy [4], varying degrees of more subtle involvement of the trigeminal pathway in the form of neuropathy may be relatively common. In 1 study, 28% of patients with Bell’s palsy had deficits in trigeminal evoked potentials, suggestive of a dysfunctional trigeminal pathway. [2] In 2 other studies, 25% of patients with Bell’s palsy had evidence of hypoesthesia in the trigeminal distribution. [3, 5] In yet another, electro-diagnostic evidence of blink reflex impairment was common among patients with Bell’s palsy, which was suggestive of trigeminal nerve deficits. [6]
Bell’s palsy with trigeminal involvement has also been associated with dental procedures. [7, 8] It has been suggested that dental manipulation can trigger herpesvirus reactivation, which in turn activates the immune system and can trigger cranial nerve demyelination. [7, 8] It has also been proposed that Bell’s palsy patients can develop pain referral to the face, ear, or neck through a central mechanism in which nociceptive signals are transmitted from the facial nerve to the trigeminocervical nucleus in the brainstem. [9, 10] While many cases of Bell’s palsy begin to improve within 1 month [11], some are slower to improve, thus patients may seek care from complementary and alternative medical practitioners. [4]
The differential diagnosis for facial pain is broad. [12, 13] Paroxysmal pain is most suggestive of neuralgia, such as trigeminal neuralgia, although other nerves are rarely involved, such as the supraorbital nerve. [12] When cranial nerve findings are present, such as facial palsy, facial pain is almost always secondary to another condition. [12] Examples include multiple sclerosis and other inflammatory or infectious etiologies such as herpesvirus infections. [12] Facial pain with focal autonomic signs is typically suggestive of trigeminal autonomic cephalgia. [12, 13] However, facial pain may also be related to sinus or temporomandibular joint pathology, or be idiopathic. [12, 13]
In Hong Kong, the setting of the current case, and the United States, chiropractors are portal-of-entry providers that commonly treat neuromusculoskeletal disorders. [14–16] According to a survey conducted in the United States in 2014, chiropractors reported encountering patients with a cranial nerve disorder about 1–6 times per year. [17] In addition, chiropractors often treat patients with neck pain, which can occur in Bell’s palsy, and is the second most common condition chiropractors treat after low back pain. [15]
Given that Bell’s palsy can co-occur with symptoms of trigeminal neuropathy such as face and neck pain, and chiropractors may encounter these patients whose symptoms fail to self-resolve, we present an illustrative case of such a patient improving with multimodal chiropractic care including spinal manipulation.
Case Report
Patient Information
Figure 1
Figure 2 A 52–year-old Asian woman presented to a chiropractor with a 3–year history of constant axial, bilateral, and non-radicular neck pain, and pain, weakness, a subjective sensation of stiffness, and paresthesia of the left side of her face (Figure 1), with pain rated a 4 out of 10 on the numeric rating scale. Symptoms began after cleaning her left maxillary molars with a toothpick, which resulted in an episode of bleeding. Over the span of a few days, her pain and paresthesia spread to the left eyebrow and maxillary and temporomandibular regions (Figure 2), and she also noted the onset of left-sided facial palsy and tinnitus during this period. Her sensory symptoms were constant yet varied depending on activity, with temporomandibular region pain being worsened by talking. She described having an increased sensitivity of left side of her face, with localized tenderness to touch in the region of symptoms. She had no symptoms of dysphonia, dysphagia, or dysarthria and denied having any brief, paroxysmal attacks of facial pain. Her World Health Organization Quality of Life scale (WHOQOL-100) was rated as 72%.
She noted difficulty with drinking water, even with a straw, due to difficulty in grasping the straw with her lips or forming a seal around the edge of a cup, and accordingly could spill liquid when drinking. The patient reported a limited ability to make facial expressions such as smiling due to weakness of the left side of the face and reported a slight drooping of the left eyelid at rest, which was worsened when attempting facial expressions. She also had difficulty with raising the left eyelid and eyebrow, and fully closing the left eye.
The patient denied having any overt infection or fever at the onset of her symptoms but did endorse occasional cold sores around her lips. She denied having any loss of balance, 53–year-old Asian woman presents to chiropractor with a 3–year history of constant neck pain and left facial pain and paresis
Patient’s gums are irritated when cleaning mouth with toothpick; neck pain, face pain and paresthesia, and facial palsy ensue over a few days weakness in the extremities, vision problems, photophobia, hearing problems, cognitive difficulties, loss of taste or smell, pain elsewhere in the head, upper-extremity symptoms, or history of neck or head trauma. She had no history of hyper-tension, diabetes, or seizures, did not smoke or drink alcohol, and was otherwise healthy. The patient denied having a family history of neurological disorders or cancer.
She previously consulted her primary care medical doctor, a dentist, and Chinese medicine practitioner prior to presenting to our office and was diagnosed with Bell’s palsy by all 3 providers. In addition, the dentist diagnosed her with gingivitis, but there was no other significant dental pathology and no sign of caries on dental radiography. She was initially treated by her medical provider with a combination of oral acyclovir and prednisone. The Chinese medicine practitioner then prescribed a combination of herbal medicine (Pueraria 20 g, Ephedra 6 g, Guizhi 10 g, Chinese peony 10 g, silkworm 12 g, white aconite 9 g, whole scorpion 9 g, jujube 6 g, licorice 6 g, ginger 10 g). The patient also received multiple acupuncture sessions. She had not been recommended botulinum toxin injection.
The patient reported that her symptoms overall had improved by about 60% during the first year of her condition, with the treatments described above, before reaching a plateau. Her symptoms then remained unchanged for 2 years until she presented to the chiropractor. Over-the-counter oral analgesics and nonsteroidal anti-inflammatory drugs did not provide any relief. The patient was then referred by a family member to the chiropractic office for a second opinion.
Clinical Findings
On physical examination by the chiropractor, the cranial nerve examination was unremarkable, including the corneal reflex, except for the facial paresis. The patient had a drooping of the left eyelid at rest, which was worsened when attempting other facial expressions (ie, synkinesis). She also could not pucker or purse her lips, puff her cheeks, fully close her left eye, fully elevate the left eyebrow, or fully smile on the left side of the face. Given the facial asymmetry at rest and other deficits, the patient was graded IV on the House-Brackmann Facial Paralysis Scale, in which grade VI is total paralysis.
There was no balance abnormality on Romberg’s test, dysdiadochokinesia, intention tremor, or past pointing. Upper-extremity muscle strength and muscle stretch reflexes were normal, and no pathologic reflexes were noted (eg, Babinski sign). The patient noted tenderness with palpation of the left medial eyebrow and maxilla, and the erector spinae were hypertonic bilaterally throughout the cervical spine. There were no physical signs of a functional facial weakness, such as an active contraction of muscles on the lower part of the left side of the face. Further, there were no signs of excessive muscle activity in the left side of the face such, as may be found in blepharospasm or hemifacial spasm.
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7 Motion palpation of the spine revealed restriction with tenderness at the C2–C4 and T2–T5 levels. Her active cervical range of motion was full and pain-free in all directions. While the patient’s neurological examination was unremarkable aside from the facial paresis, her symptoms were atypical enough and had resisted prolonged conservative care; therefore, the chiropractor preferred to order a cervical spine magnetic resonance imaging (MRI) at the initial consultation which was performed on the same day.
The cervical spine MRI revealed low-lying cerebellar tonsils, loss of the cervical lordosis, and degenerative spondylosis (Figure 3). Disc desiccation and mild disc bulges were evident at C2/3, C3/4, C4/5, C5/6, and C6/7, with a posterior annular fissure noted at the C3/4 and C6/7 levels. There was no evidence of myelopathy or other serious pathology on the cervical spine MRI. Accordingly, the chiropractor considered there to be no contraindications to spinal manipulation or other manual therapies directed to the cervical spine.
The patient was placed on a trial schedule of conservative treatment 3 times per week for the first week. All manipulations were performed manually and involved a high-velocity, low-amplitude thrust as part of chiropractic diversified technique [18], and were performed with the use of a cushioned treatment table (Elite, Canada). Manipulations targeted C2 (Figure 4), the upper thoracic segments T2 and T3 (Figure 5), and mid-thoracic segments T4 and T5 (Figure 6), which were levels identified as having hypomobility and tenderness on examination.
Intermittent mechanical cervical traction (Spine MT series, Shinhwa Medical, Korea) was applied for 20–min sessions at each visit. Traction was administered as a means of providing a gentle axial distractive force to alleviate neck pain, relax hypertonic neck muscles, and potentially improve degenerative disc-related symptoms. [19] According to a recent systematic review, cervical spine traction provides a short-term pain-relieving effect. [20] In contrast, spinal manipulation was provided in the regions surrounding these areas of disc degeneration and focused on areas of reduced intervertebral motion and pain on motion palpation.
After the first week of care, the patient reported a reduction in her face and neck pain to a 2/10 on the numeric rating scale, and reported being able to talk without an increase in jaw pain. As the patient had improved, the visit frequency was subsequently reduced to once per week for an additional 3 weeks. Further treatments also included instrument-assisted soft-tissue manipulation (Massage instrument, Strig, Korea) to alleviate hypertonic cervical paraspinal muscles. She was also instructed to perform repeated active cervical retraction exercises in sets of 10, and a gentle upper trapezius stretch (lateral flexion with slight rotation for 10 s, performed bilaterally), each 3 times per day. The patient’s compliance with home exercises was not objectively tracked.
At the 1–month follow-up visit after initial presentation, her WHOQOL-100 score had improved to 98%. Her only residual symptom was mild left eyelid drooping when making other facial expressions (Figure 7). However, her other facial movements were restored. Her face pain, neck pain, and other symptoms were also completely gone. There were no adverse outcomes related to any of the treatments, including spinal manipulation and other therapies. The patient provided written consent for the publication of this case report and any accompanying images.
Discussion
This case illustrates an example of concomitant chronic Bell’s palsy and trigeminal neuropathy with resultant facial paresis and face and neck pain. The patient improved with multimodal chiropractic care, including spinal manipulation, after reaching a plateau in recovery with other therapies. In the current case, we suggest that the use of the toothpick caused inadvertent minor trauma or stress to the patient’s gums, which may have triggered herpesvirus reactivation. This was suggested by the patient’s self-reported history of cold sores, and consistent with previous research regarding dental manipulation as an etiology of viral Bell’s palsy with trigeminal features. [7, 8] We also suspect that the cervical spine played a role in the patient’s symptoms, given previous research showing an association between upper–cervical spine and trigeminal neve symptoms. [21, 22] The low-lying cerebellar tonsils in this case were likely an asymptomatic, incidental finding, as this did not meet the threshold for grade 1 Arnold Chiari Syndrome (5 mm below the foramen magnum), and there was no syringomyelia present and no cerebellar signs on examination. [23]
In the current case, in addition to the patient’s classic cranial nerve VII facial palsy symptoms, we suspect that involvement of the V2 division of the trigeminal nerve contributed to her facial sensory symptoms given the mostly maxillary distribution. However, the somatotopic organization of the trigeminal pathway is complex, and patients with involvement of the trigeminocervical nucleus may have more of an onion-skin pattern of circumferential symptoms rather than a typical V1, V2, or V3 pattern. [24, 25] As the patient’s sensory pattern spared the perioral region and overlapped classic regions of V1 (eyebrow) and V3 (mandible) [26], it is possible that her sensory distribution was not a pure V2 pattern, and had onion-skin elements due to nociceptive referral from cranial nerve VII through the spinal trigeminal nucleus. [9, 10] Although the patient had tinnitus, there were no other signs of vestibulocochlear nerve involvement or vestibular neuritis. Tinnitus can accompany painful disorders of the head and neck [27], and has been reported in cases of Bell’s palsy. [9]
Table 1 A search of PubMed, Google Scholar, and hand-searching of a recent review paper [28] on June 3, 2022 identified 12 case reports in which a chiropractor successfully treated Bell’s palsy using spinal manipulation. [29–37] Of these cases, including the current case (ie, a total of 13 cases), the mean patient age was 36 (SD) ±14 years and the mean duration of symptoms was 13 (SD) ±19 months, with 54% of patients being female (Table 1). Of these cases, 11/13 (85%) patients had pain in either the face or neck, while 9/13 (69%) had neck pain. Among cases reporting the location of spinal manipulation (11/13), this therapy was administered to the cervical spine in each case (11/11, 100%), and to the upper cervical spine in 8/11 (73%) of cases. Select patients received additional treatments, such as acupuncture [29, 37], infrared light [29, 30], and electric stimulation [31, 33, 34]; therefore, the positive response to treatment could have been related to a combination of therapies rather than spinal manipulation alone.
It is possible that the trigeminocervical tract plays an important role in the clinical course of the patients responding to chiropractic spinal manipulation, given the high proportion of neck and face pain among these patients (Table 1). We therefore hypothesize that spinal manipulation may alleviate trigeminal neuropathy symptoms concurrent with Bell’s palsy via a central mechanism. Spinal manipulation provides a mechanoreceptive afferent input to the spine, which can inhibit nociceptive signaling, providing an overall analgesic effect. [38] In particular, sensory information from the upper cervical spine converges with the trigeminal nucleus caudalis. [39] It thereby is possible that the mechanoreceptive stimulation provided by upper cervical spine manipulation suppresses nociceptive signaling along the spinal trigeminal tract, thereby alleviating facial and neck pain.
We also suggest possible mechanisms whereby manual therapy could improve facial paresis resultant from Bell’s palsy. Recent evidence suggests that patients with Bell’s palsy may develop sensory-motor incongruence, as they have delayed recognition of emotional facial expressions. [40] Further, a recent systematic review found evidence that patients with chronic facial pain have an altered body schema (impaired cortical proprioceptive representation). [41] Recent evidence also suggests that spinal manipulation can help restore sensory-motor congruence [42], but this mechanism has not been studied specifically in Bell’s palsy. Another potential mechanism relies on the concept of pain-related weakness, whereby muscle strength is inhibited in the presence of pain, and improved in the absence of pain. [43] It is therefore possible that by alleviating patients’ face and neck pain through spinal manipulation, facial motor function likewise improves. Finally, natural history may explain the changes in the symptoms.
It is challenging to explain why the patient in the current case had such a rapid improvement with a multimodal regimen featuring spinal manipulation while she had plateaued with other therapies such as acupuncture. [44] We suggest that the involvement of the trigeminal nerve and corresponding neck pain were aspects related to the chronicity of the patient’s symptoms. It is possible the cervical spine became a secondary source of pain, which was not fully addressed by the other modalities. This was then alleviated by manual therapies directed toward the cervical spine, including chiropractic spinal manipulation. In accordance with this hypothesis, we suggest that nociceptive signaling (ie, pain), rather than overt nerve damage, was a key pathophysiological culprit in the current case, due to the rapid reversibility of most of the patient’s symptoms with multimodal chiropractic care.
Despite the apparent success in this case and other previous cases, there remains limited evidence to support chiropractic multimodal therapy or chiropractic spinal manipulation for Bell’s palsy. Larger cohort studies or even randomized trials are needed to adequately evaluate the effectiveness and efficacy of this therapy in Bell’s palsy. As Bell’s palsy often resolves quickly [11], the time course of recovery of patients receiving spinal manipulation should be compared to those receiving standard medical care such as with antivirals and/or prednisone. Further, subgroup analysis of patients with or without concomitant face or neck pain (ie, trigeminal involvement) may aid in our understanding of which patients with Bell’s palsy respond positively to spinal manipulation.
Limitations
As an individual case report, our findings may not be broadly generalizable. As the patient had seen several providers over multiple years, some of her previous testing was unavailable or was unclear if it had been conducted altogether, such as brain MRI or viral titers for herpesviruses. Regardless, it did not seem likely that the patient suffered from brain pathology such as a tumor or vascular lesion, given her lack of widespread neurological deficits, limited ability to raise the left eyebrow, which diminishes the likelihood of central nervous system pathology [15], and in retrospect, her rapid response to spinal manipulation. In addition, many of her clinical features and history of cold sore outbreaks were classic for a viral etiology of Bell’s palsy. It is entirely possible that the Bell’s palsy resolved due to natural history. The patient’s response to treatment could have related to a combination of therapies beyond chiropractic spinal manipulation, as cervical traction, soft-tissue treatment, and neck exercises were also implemented. However, these therapies likewise targeted the cervical spine, which we suggest was key to the patient’s improvement.
Conclusions
Patients with Bell’s palsy may also develop symptoms of trigeminal neuropathy. The current case as well as those previously published suggest that these patients may respond to chiropractic multimodal therapy including spinal manipulation, possibly because of the effect of these therapies on the afferents of the trigeminal pathway and accompanying symptoms such as neck pain. Although individual cases show the promise of chiropractic management for these patients, more rigorously designed studies are needed to evaluate the utility of this therapy in Bell’s palsy with or without concurrent trigeminal neuropathy.
Acknowledgments
We thank Sheryl Walters, MLS, for her assistance in obtaining chiropractic case reports for our literature review.
Department and Institution Where Work Was Done
New York Chiropractic and Physiotherapy Centre, EC Healthcare, Kowloon, Hong Kong.
Declaration of Figures’ Authenticity
All figures submitted have been created by the authors who confirm that the images are original with no duplication and have not been previously published in whole or in part.
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