The potential role of trigeminal nerve irritation in the pathophysiology of Bell's palsy. A case report from a Neural Therapy perspective
El posible papel de la irritación del nervio trigémino en la fisiopatología de la parálisis de Bell. Un reporte de caso desde la Terapia Neural
O possível papel da irritação trigeminal na fisiopatologia da paralisia de Bell. Um relato de caso da Terapia neural
DOI:
https://doi.org/10.15446/cr.v8n2.93840Palabras clave:
Anesthetics, Local, Bell Palsy, Facial Nerve, Trigeminal Nerve, Periapical Diseases, Neurophysiology (en)Anestésicos locales, Parálisis de Bell, Nervio facial, Nervio trigémino, Enfermedades periapicales, Neurofisiología (es)
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Abstract
Introduction: Bell's palsy or acute peripheral facial palsy is a nerve lesion that impairs the motor and sensory function of the facial nerve. This disorder has a sudden onset, affects facial mimicry, and puts at risk the anatomy and function of the facial nerve. The present case report aims to present, from the perspective of Neural Therapy, a possible hypothesis, supported by the principles related to Nervism, regarding its pathogenesis.
Case presentation: A 32-year-old woman from Brazil presented with grade III facial paralysis on the right side. 10 days after symptom onset and no response to treatment, she decided to attend a Neural Therapy appointment. Following a chronological analysis of her life history with a neural therapy approach, a dystrophic affectation of the trigeminal nerve was detected due to irritative dental foci, which were treated, obtaining a clinical improvement to grade I.
Conclusions: The neuroanatomical connection between the facial nerve and the trigeminal nerve allows proposing an etiological hypothesis of Bell's palsy. The present case shows the therapeutic role played by the Neural Therapy and Dentistry services in the resolution of this disorder by addressing irritations in the trigeminal area.
Resumen
Introducción. La parálisis de Bell o parálisis facial periférica es una lesión nerviosa que afecta la función motora y sensorial del nervio facial y se presenta de forma súbita con afectación de la mímica facial. Es una neuropatía que representa un riesgo anátomo-funcional del nervio facial. El presente reporte de caso tiene como objetivo presentar, desde la perspectiva neuralterapéutica, una posible hipótesis soportada por las leyes descritas por el nervismo acerca de la patogénesis de la parálisis de Bell.
Presentación de caso. Mujer de 32 años procedente de Brasil, quien presentó parálisis facial de grado III en la parte derecha. Luego de 10 días de evolución sin respuesta al tratamiento, decidió acudir a Terapia Neural. Previo análisis cronológico de la historia de vida con enfoque neuralterapéutico, se apreció una afectación distrófica del nervio trigémino dado por focos odontológicos irritativos, los cuales fueron tratados, obteniendo una mejoría clínica a grado I.
Conclusiones. La conexión neuroanatómica entre el nervio facial y el trigémino posibilita la hipótesis etiológica de la parálisis de Bell. Este caso muestra el papel terapéutico que desempeñaron la Terapia Neural y la odontología en la resolución de una parálisis de Bell al abordar las irritaciones del nervio trigémino.
Introdução
A paralisia de Bell é uma lesão do nervo periférico que afeta a função motora e sensorial do nervo facial, ocorre repentinamente com envolvimento da mímica facial, sua etiologia é uma neuropatia edematosa que constituirá um risco anatômico funcional do nervo facial. O presente relato de caso tem como objetivo ilustrar possíveis hipóteses da terapia neural perceptiva sobre a patogênese da paralisia de Bell, amparada nas leis conhecidas como nervismo descritas por Iván Pavlov.
Apresentação de caso de introdução
Descrevemos o caso clínico de um paciente brasileiro de 32 anos que apresentou paralisia de Bell à direita grau III, que após 10 dias de evolução sem resposta ao tratamento, decidiu iniciar tratamento neural terapêutico. Após análise cronológica da história de vida com abordagem neuralterapêutica, observou-se comprometimento neurodistrófico do nervo trigêmeo devido a focos dentais irritativos que foram tratados com melhora clínica para grau I.
Conclusões
A conexão neuroanatômica entre o nervo craniano V-VII permite a hipótese etiológica de paralisia de Bell. Este caso exemplifica que uma alteração cumulativa do trigêmeo anterior ao longo do tempo acaba afetando o trofismo do nervo facial via anastomose.
https://doi.org/10.15446/cr.v8n2.93840
The potential role of trigeminal nerve irritation in the pathophysiology of Bell’s palsy. A case report from a Neural Therapy perspective
Keywords: Anesthetics, Local; Bell Palsy; Facial Nerve; Trigeminal Nerve; Periapical Diseases; Neurophysiology.
Palabras clave: Anestésicos locales; Parálisis de Bell; Nervio facial; Nervio trigémino; Enfermedades periapicales; Neurofisiología.
Maura Kawano-Hokama
Universidad Federal de Mato Grosso do Sul - Faculty of Medicine
Mato Grosso do Sul - Brasil
Lucy Naomi Shiratori-Tusita
Universidad de São Paulo - School of Dentistry
São Paulo - Brasil
Laura Bibiana Pinilla-Bonilla
Universidad Nacional de Colombia
- Faculty of Medicine -
Master’s Degree in Alternative Medicine
- Bogotá - Colombia
Yamile Cruz-Rodríguez
Asociación Colombiana de Terapia Neural
- Bogotá - Colombia
Corresponding author
Laura Bibiana Pinilla-Bonilla.
Universidad Nacional de Colombia, Facultad de Medicina, Maestría en Medicina Alternativa. Bogotá. Colombia. Email: lbpinillab@unal.edu.co
Received: 22/02/2021 Accepted: 08/11/2021
Introduction
Bell’s palsy is a facial neuropathy that has a sudden onset with loss or decrease of motor and sensory function of the facial nerve. This disorder may affect partially or completely, and unilaterally or bilaterally, facial mimicry (1,2).
Full recovery has been observed in 70% of cases, while 16% of them show moderate to severe sequelae. Convalescence time varies from 15 days to 2 months, and, in more severe cases, it can last up to 4 years (3). Patients who have experienced an episode of Bell’s palsy have an 8% risk of recurrence (3,4). Different incidence rates have been reported depending on the geographic location. In most published series, incidence rates range from 11 to 40 cases per 100 000 inhabitants every year, as reported by epidemiological studies in the United States, the United Kingdom, and Mexico (3-7). The disease has a peak incidence between 15 and 45 years of age, with no sex distinction, and the following are described as risk factors: diabetes, obesity, high blood pressure, upper respiratory tract infections, immunosuppression, and pregnancy (1,5).
In 75% of the cases, the cause of this paralysis is unknown (8), but two theories have been suggested to explain its possible etiology. On the one hand, the vascular theory describes an imbalance in the extrinsic and intrinsic vascular system of the intrapetrosal facial nerve. On the other hand, the viral theory suggests that it is the consequence of a reactivation of the herpes simplex virus type 1 (HSV-1) (1,2,5). However, one of the possible hypotheses that could support the etiology of Bell’s palsy is based on the neuroanatomical connection between the V-VII cranial nerves (9-11), since the maxillary branch has approximately 95% of the communication with the facial nerve, while the mandibular branch has 75%, followed by the ophthalmic branch with 34% (12,13).
Neural Therapy has its roots in the physiological current of Nervism, which emerged in the mid-nineteenth century (14). Nervism proposed that the nervous system behaved as a functional and integrative unit, playing a leading role in all the processes of the organism; this approach allowed for a radical change in the concept of the pathological origin of diseases (15,16). In this approach, disease started to be defined as a dystrophy that begins with an irritation in the nervous system that could be cumulative, reflexive, non-linear and irreversible, altering the final trophism of the tissues (15-18).
From the perspective of Nervism, it could be argued that both nervous and embryological connections are responsible for the spread of the pathologic process of the nervous system from a focus lesion point to its segmental connections (15). Thus, therapeutic and Nervism approaches are directed towards the modulation of nervous tone and irritations of the nervous system.
The present case report aims to propose that idiopathic facial paralysis or Bell’s palsy is caused by a cumulative and irritative involvement of the trigeminal nerve, a hypothesis that is based on a neural therapy approach and the physiological current of Nervism.
Case Report
A 32-year-old woman, an early childhood educator, housewife, from a middle-class household residing in Mato Grosso do Sul, Brazil, presented in 2018, without an apparent cause, with an episode of right facial paralysis due to a decrease in frontalis muscle strength. Her symptoms at the time of consultation included incomplete closure of the right eye, decreased strength of the right eyelid, face asymmetry, and sensory alterations of the middle and lower segment of the right side of the face. She did not report pain, alteration in taste, or changes in salivary and lacrimal gland secretions (Figure 1).
![](https://revistas.unal.edu.co/index.php/care/article/download/93840/version/76008/86943/615087/Fig_1.png)
Figure 1. Grade III and incomplete right facial asymmetry.
Source: Image obtained during the study.
At first, the patient opted for a private consultation to the neurology service at a secondary care institution in the city of Campo Grande, Mato Grosso do Sul, Brazil, where, due to her symptoms and on the basis of the physical examination, she was diagnosed with grade III right peripheral incomplete facial palsy, severity established according to the House–Brackmann score. As a result of her neurology appointment, she was prescribed treatment with oral prednisone 20 mg/day, which was administered for 5 days. During the same appointment, a brain MRI was performed in order to rule out any neurological involvement, obtaining a normal result. Given the persistence of the symptoms, the patient decided to consult the private Neural Therapy service after 10 days.
During the consultation with the Neural Therapy service, upon reviewing the patient’s medical history, a number of personal medical records were found that showed previous irritations in the trigeminal nerve area that began at the age of 12 (Table 1).
Table 1. Patient’s medical history in chronological order, specifying laterality, innervation, and facial nerve branches with anastomoses.
Condition |
Age |
Laterality |
Innervation |
Anastomosis |
Otitis |
12 years |
Right |
V3, X, VII |
Facial nerve trunk, sensory branch of the facial nerve |
Parotiditis |
15 years |
Bilateral |
V3 |
Facial nerve trunk through the chorda tympani. |
Tonsillitis |
23 and 31 years |
Bilateral |
IX, X, V2 |
Zygomatic branch of the facial nerve |
Stye |
24 years |
Right |
V1, V2 |
Temporal and zygomatic branches of the facial nerve |
Source: Own elaboration.
At the same consultation, a panoramic X–ray of the mouth was requested because of her dental history, in which an irritative focus was identified in tooth 16. With this result, the patient was referred to the Dentistry service for treatment 21 days after the onset of symptoms. At that visit, the dentist determined that there was a chronic periapical lesion in tooth 16 (Table 2).
Table 2. Dental history in chronological order specifying the intervention performed, dental piece, innervation, and facial nerve branch with anastomosis.
Procedure |
Age |
Tooth |
Innervation |
Anastomosis |
Restoration |
21-22 years |
16 |
V2R* |
Zygomatic branch of the facial nerve |
Dental extraction |
23 years |
28, 38, 48 |
V2R&L*, V3R* |
Zygomatic branch of the facial nerve, facial trunk through the chorda tympani |
Damage of restoration in tooth 16 |
30 years |
16 |
V2R* |
Zygomatic branch of the facial nerve |
Restoration |
30-31 years |
16 |
V2R* |
Zygomatic branch of the facial nerve |
*R: right.
Source: Own elaboration.
At the Neural Therapy consultation, it was decided to start treatment from the first day of care with 1% procaine infiltrations, subject to prior informed consent. In this case, a better outcome was obtained after neural therapy stimulation with submucosal infiltration of 1% procaine in the alveolar branches of tooth 16, which was performed 20 days after the onset of symptoms. The following day, at the dental appointment, endodontics was performed on tooth 16 due to the lesion found. Table 3 shows the dental and neural therapy interventions performed in chronological order.
Table 3. Neural therapy and dental interventions correlated with patient clinical response.
Course (days from symptom onset) |
Intervention (neural therapy |
Response |
10 days |
Neural therapy stimulation with 1 cc of procaine in the right supraorbital and infraorbital nerve and tooth 18. |
No clinical changes. |
13 days |
Neural therapy stimulation near the right stellate ganglion with 3 cc of procaine. |
No clinical changes. |
20 days |
Neural therapy stimulation with 1 cc of procaine in tooth 16. |
Irritation of the right eye conjunctiva 8 hours later. |
21 days |
Dental care. Endodontic treatment tooth 16 |
Progressive improvement of facial mimicry in 48 hours. Evolution towards grade I on the House–Brackmann score. |
24 days |
Dental care. Extraction of tooth 18. |
The improvement of facial mimicry is maintained. |
25 – 30 days |
Control without neural therapy stimulus. |
Complete recovery of facial mimicry. |
2 years later |
Control. |
Normal facial mimicry. |
Source: Own elaboration.
Within 48 hours of performing endodontic treatment on tooth 16, Bell’s palsy improved from grade III to grade I on the House–Brackmann score, and facial mimicry symmetry was recovered. During the treatment, no concurrent interventions were performed other than those practiced by the Neural Therapy and Dentistry services (Figure 2).
![](https://revistas.unal.edu.co/index.php/care/article/download/93840/version/76008/86943/615088/Fig_2.png)
Figure 2. Symmetry of facial mimicry grade I.
Source: Image obtained while conducting the study.
Two years after undergoing the neural therapy and dental intervention, the patient returned for a follow-up, in which no adverse reactions to the treatment were reported, and no neurological sequelae were evidenced in the trigeminal and facial nerve area. During follow-up, the patient reported feeling satisfied with the treatment and authorized the publication of the case report.
Discussion
The theory of Nervism defines what happened with the patient as a primary dystrophy of the trigeminal nerve, which correlates with her dental history of chronic periapical lesion in tooth 16 that caused a secondary dystrophy in the area of the facial nerve by reflex nerve mechanisms. Such dystrophy finally appeared in the form of paralysis due to the principle of Nervism as stated in Speransky’s theory of the second stroke or sum of irritations (15,16).
The neuroanatomical connection between the V-VII cranial nerves enables the association of new theories with Bell’s palsy:
- Bell’s palsy cases have been reported following dental procedures, trigeminal nerve injuries, and dental and bone infections (19-22).
- Another theory refers to the vascular relationship between the middle meningeal artery that irrigates both nerves and the ischemic sympathetic reflex of the stylomastoid artery with the motor branch of the facial nerve (23,24).
- According to Friedman, the proprioceptive fibers of the facial nerve are received by the trigeminal nerve at its mesencephalic nucleus (9,25).
- Finally, Bell’s palsy may be related to the cross-connection between the afferent nerve fibers of the intermediate nerve with the V2 fibers (maxillary nerve or pterygopalatine ganglion) (26).
From an embryological point of view, the trigeminal and facial nerves have an anastomotic association. In the fourth week of pregnancy, the first branch of the facial nerve appears and, at the end of the seventh week, the trunk of the facial nerve bifurcates into a temporal branch and a cervicofacial branch, creating an anastomosis with the V2 and V3 branches of the trigeminal nerve (27-29).
In the specific field of Neural Therapy, only cases of clinical improvement of facial paralysis have been reported, but without mentioning the pathogenic involvement of trigeminal irritation or dystrophy, nor the synergy with the Dentistry service (30-32). So far, clinical accounts have been limited to demonstrating that Neural Therapy can be a viable treatment option after conventional medical treatment has failed. However, these case reports did not take into consideration the evaluation of trigeminal nerve irritations as a possible etiologic factor. In fact, only 2 of the 7 published case reports cite the presence of dystrophic irritations in the area of the trigeminal nerve, such as dental treatments, temporomandibular joint dysfunction, tonsillitis, and chronic sinusitis. In these cases, reported in Turkey, mainly segmental Neural Therapy was performed in the head and neck area obtaining favorable outcomes (30-32).
The aim of this case report was to propose that Bell’s palsy is caused by a cumulative involvement of the trigeminal nerve, a hypothesis based on the Neural Therapy approach and the physiological current of Nervism. In this case, the patient who consulted the Neural Therapy service presented with a clear history of trigeminal field irritations during her lifetime, with a predominance in the V2 branch, which were related to the interventions and dental foci described in Tables 1 and 2. Thus, a new etiologic hypothesis on the pathophysiologic relationship between the trigeminal and facial nerves is hereby proposed, which should be analyzed in further studies given the limitations of the present study as it is a case report.
Finally, this case exemplifies a situation in which a previous dystrophy or anterior alteration of the trigeminal nerve through its different branches, cumulative over time, ends up affecting via anastomosis the nervous tone or trophism of the facial nerve, which has a clear morphological and physiological support under the premise of the unity of the nervous system.
Conclusions
This case report not only highlights the role of Neural Therapy in the therapeutic support of Bell’s palsy, but also represents a contribution to medical knowledge from a different physiological conceptual framework such as Nervism. It is suggested that obtaining more information on the patient’s clinical history is important to determine the relationship between the facial nerve and the trigeminal nerve (Table 2), as it is a useful tool to demonstrate these findings. Furthermore, this article is the first case report showing the synergy between the Neural Therapy and Dentistry services for successful therapeutic support in Bell’s Palsy.
Ethical considerations
Informed consent was obtained from the patient, along with authorization for the publication of her photographs.
Conflict of interest
None stated by the authors.
Funding
None stated by the authors.
Acknowledgments
To the patient, who trusted in the treatment’s purpose and granted us permission to carry out this report. Also, to our relatives for their support during the development of this paper.
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Referencias
Quesada P, López D, Quesada J. Ponencia Oficial del LXI Congreso Nacional de la Sociedad Española de Otorrinolaringología y Patología Cérvico-Facial. In: LXI Congreso Nacional de la Sociedad Española de Otorrinolaringología y Patología Cérvico-Facial. Valencia; 2010.
Lassaletta L, Morales-Puebla J, Altuna X, Arbizu A, Arístegui M, Batuecas A, et al. Parálisis facial: guía de práctica clínica de la Sociedad Española de ORL. Acta Otorrinolaringol Esp. 2020;71(2):99-118. https://doi.org/gkh5fc. DOI: https://doi.org/10.1016/j.otorri.2018.12.004
Ramírez-Aguirre A, Alvarado-Rojas A, Xeque-Morales AS, Morales-Hernández AG. Frecuencia de la parálisis de Bell en un centro de rehabilitación integral en un municipio de la ciudad de Querétaro. Investigación en Discapacidad. 2018 [cited 2022 Dec 20];7(1):30-4. Available from: https://bit.ly/3Gi5txL.
Campos-Mahecha AM, Villamor-Rojas P. Parálisis facial recurrente: un algoritmo clínico para su diagnóstico y manejo. Acta Otorrinolaringol Cir Cabeza Cuello. 2018;46(2):32-8. DOI: https://doi.org/10.37076/acorl.v46i2.87
Holland JN, Weiner GM. Recent developments in Bell’s palsy. BMJ. 2004;329(7465):553-7. https://doi.org/dmx8c2. DOI: https://doi.org/10.1136/bmj.329.7465.553
Instituto Mexicano del Seguro Social. Guías de práctica clínica. Diagnóstico y tratamiento del adulto con parálisis de Bell en el primer y segundo nivel de atención. Ciudad de México; 2017. Available from: https://bit.ly/3HSmgsk.
Diego-Sastre JI de, Prim-Espada MP, Fernández-García F. Epidemiología de la parálisis facial de Bell. Rev Neurol. 2005;41(5):287-90. https://doi.org/jqzd. DOI: https://doi.org/10.33588/rn.4105.2004593
Valdez GJ, Pérez J, Ponce MB, Pérez G, Díaz V. Parálisis facial: ¿siempre parálisis de Bell? Rev Clin Med F. 2013;6(3):169-71. https://doi.org/jqzc. DOI: https://doi.org/10.4321/S1699-695X2013000300008
Baumel JJ. Trigeminal-Facial Nerve Communications: Their Function in Facial Muscle Innervation and Reinnervation. Arch Otolaryngol. 1974;99(1):34-44. https://doi.org/c3kn3v. DOI: https://doi.org/10.1001/archotol.1974.00780030038007
Cobo JL, Solé‐Magdalena A, Menéndez I, de Vicente JC, Vega JA. Connections between the facial and trigeminal nerves: Anatomical basis for facial muscle proprioception. JPRAS Open. 2017;12:9-18. https://doi.org/gjrbxf. DOI: https://doi.org/10.1016/j.jpra.2017.01.005
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