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Takekawa T, Chino T, Yamada N, Watanabe S, Abo M, Sengoku R. Multimodal treatment, including extracorporeal shock wave therapy, for refractory chronic tension-type headache: a case report. J Med Case Rep 2023; 17:478. [PMID: 37907963 PMCID: PMC10617078 DOI: 10.1186/s13256-023-04092-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 07/20/2023] [Indexed: 11/02/2023] Open
Abstract
BACKGROUND Few reports have described multidisciplinary treatment, including extracorporeal shock wave therapy, for patients with refractory chronic tension-type headache. In this study, we conducted multidisciplinary treatment for a patient with chronic tension-type headache who suffered from chronic headache refractory to treatment. CASE PRESENTATION The patient was a 45-year-old Japanese male suffering from 20 years of headache. As his headache had worsened recently, he visited a local clinic. With the diagnosis of suspected tension-type headache, its treatment was unsuccessful and he was referred to our hospital. The neurology department confirmed the tension-type headache and prescribed another medication, but he showed no improvement. Then, the patient was referred to the rehabilitation medicine department for consultation. At the initial visit, we identified multiple myofascial trigger points in his bilateral posterior neck and upper back regions. At the initial visit, he was prescribed 10 mL of 1% lidocaine injected into the muscles in these areas. In addition, he received 2000 extracorporeal shock wave therapy into bilateral trapezius muscles, and was instructed to take oral Kakkonto extract granules, benfotiamine, pyridoxine hydrochloride, and cyanocobalamin. Cervical muscle and shoulder girdle stretches and exercises were also recommended. At follow-up treatment visits, we used extracorporeal shock wave therapy to bilateral trapezius muscles, which led to immediate pain relief. After 11 weeks, he was not taking any medication and his headache was subjectively improved and his medical treatment ended. CONCLUSION A patient with chronic tension-type headache refractory to regular treatment was successfully treated with a multimodal approach including extracorporeal shock wave therapy in addition to standard treatment. For patients with tension-type headache accompanied by myofascial trigger points, it may be recommended to promptly consider aggressive multimodal treatment that includes extracorporeal shock wave therapy.
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Affiliation(s)
- Toru Takekawa
- Department of Rehabilitation Medicine, School of Medicine, The Jikei University, 3-19-18, Nishi-Shimbashi, Minato-ku, Tokyo, 105-8471, Japan.
| | - Toshifumi Chino
- Department of Rehabilitation Medicine, School of Medicine, The Jikei University, 3-19-18, Nishi-Shimbashi, Minato-ku, Tokyo, 105-8471, Japan
| | - Naoki Yamada
- Department of Rehabilitation Medicine, School of Medicine, The Jikei University, 3-19-18, Nishi-Shimbashi, Minato-ku, Tokyo, 105-8471, Japan
| | - Shu Watanabe
- Department of Rehabilitation Medicine, School of Medicine, The Jikei University, 3-19-18, Nishi-Shimbashi, Minato-ku, Tokyo, 105-8471, Japan
| | - Masahiro Abo
- Department of Rehabilitation Medicine, School of Medicine, The Jikei University, 3-19-18, Nishi-Shimbashi, Minato-ku, Tokyo, 105-8471, Japan
| | - Renpei Sengoku
- Department of Neurology, The Jikei University Daisan Hospital, 4-11-1, Izumihoncho, Komae-shi, Tokyo, 201-8601, Japan
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2
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Robblee J. Breaking the cycle: unraveling the diagnostic, pathophysiological and treatment challenges of refractory migraine. Front Neurol 2023; 14:1263535. [PMID: 37830088 PMCID: PMC10565861 DOI: 10.3389/fneur.2023.1263535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 09/11/2023] [Indexed: 10/14/2023] Open
Abstract
Background Refractory migraine is a poorly described complication of migraine in which migraine has chronified and become resistant to standard treatments. The true prevalence is unknown, but medication resistance is common in headache clinic patient populations. Given the lack of response to treatment, this patient population is extremely difficult to treat with limited guidance in the literature. Objective To review the diagnostic, pathophysiological, and management challenges in the refractory migraine population. Discussion There are no accepted, or even ICHD-3 appendix, diagnostic criteria for refractory migraine though several proposed criteria exist. Current proposed criteria often have low bars for refractoriness while also not meeting the needs of pediatrics, lower socioeconomic status, and developing nations. Pathophysiology is unknown but can be hypothesized as a persistent "on" state as a progression from chronic migraine with increasing central sensitization, but there may be heterogeneity in the underlying pathophysiology. No guidelines exist for treatment of refractory migraine; once all guideline-based treatments are tried, treatment consists of n-of-1 treatment trials paired with non-pharmacologic management. Conclusion Refractory migraine is poorly described diagnostically, its pathophysiology can only be guessed at by extension of chronic migraine, and treatment is more the art than science of medicine. Navigating care of this refractory population will require multidisciplinary care models and an emphasis on future research to answer these unknowns.
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Affiliation(s)
- Jennifer Robblee
- Department of Neurology, Dignity Health, St Joseph’s Hospital and Medical Center, Lewis Headache Clinic, Barrow Neurological Institute, Phoenix, AZ, United States
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Charleston L, Royce J, Monteith TS, Broner SW, O'Brien HL, Manrriquez SL, Robbins MS. Migraine Care Challenges and Strategies in US Uninsured and Underinsured Adults: A Narrative Review, Part 2. Headache 2019; 58:633-647. [PMID: 29878343 DOI: 10.1111/head.13321] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 02/21/2018] [Accepted: 02/22/2018] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To review the challenges and potential solutions in treatment options for quality migraine care in adult patients who are under or uninsured. BACKGROUND The Affordable Care Act has improved access to health care for many; however, those who are underserved continue to face treatment disparities and have inadequate access to appropriate migraine management. METHODS This manuscript is the second of a 2-part narrative review which was performed after a series of discussions within the Underserved Populations in Headache Medicine Special Interest Section meetings of the American Headache Society. Literature was reviewed for key concepts underpinning conceptual boundaries and a broad overview of the subject matter. Published guidelines, state-specific Medicaid websites, headache quality measurement sets, literature review, and expert opinion were used to tailor suggested treatment options and therapeutic strategies. In this second part of our narrative review, we explored migraine care strategies and considerations for underserved and vulnerable adult populations with migraine. RESULTS Although common, migraine remains untreated, particularly among those of low socioeconomic status. Low socioeconomic status may play an important role in the disease progression, prescription of hazardous medications such as opioids, outcomes, and quality of life of patients with migraine and other headache disorders. There are some evidence-based and guideline supported treatment options available at low cost that include prescription medications and supplements, though approved devices are costly. Resources available online and simple nonpharmacological strategies may be particularly useful in the underserved migraine population. CONCLUSIONS We identified and discussed migraine treatment barriers that affect underserved populations in the US and summarized practical, cost-effective strategies to surmount them. However, more research is needed to identify the best cost-effective measures for migraine management in underserved and vulnerable patients who are uninsured or underinsured.
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Affiliation(s)
- Larry Charleston
- Department of Neurology, University of Michigan, Ann Arbor, MI, USA
| | - Jeffrey Royce
- Neuro and Headache Center, SwedishAmerican Hospital, Rockford, IL, USA
| | - Teshamae S Monteith
- Department of Neurology-Headache Division, University of Miami, Miller School of Medicine, Miami, FL, USA
| | - Susan W Broner
- Weill Cornell Medicine Headache Program, Department of Neurology, Weill Cornell Medical College, New York, NY, USA
| | - Hope L O'Brien
- Division of Neurology, Cincinnati Children's Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Salvador L Manrriquez
- Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA
| | - Matthew S Robbins
- Department of Neurology, Albert Einstein College of Medicine, Montefiore Headache Center, Bronx, NY, USA
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4
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Low doses of tizanidine synergize the anti-nociceptive and anti-inflammatory effects of ketorolac or naproxen while reducing of side effects. Eur J Pharmacol 2017; 805:51-57. [DOI: 10.1016/j.ejphar.2017.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 03/07/2017] [Accepted: 03/13/2017] [Indexed: 01/15/2023]
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5
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Abstract
Cystitis is a possible adverse drug reaction associated with the use of tizanidine. Such cases have been rarely reported in literature because of the difficulty in establishing the causality. However, from a pharmacovigilance point of view, it is better to report such cases of a possible association between a drug’s use and potential adverse drug reactions. We report a case of a 26-year-old Asian female on famotidine who presented with acute severe urinary burning after taking tizanidine.
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Affiliation(s)
- Resham Raj Poudel
- Department of Medicine, Om Saibaba Memorial Hospital, Kathmandu, Nepal
| | - Nisha Kusum Kafle
- Department of Public Health, Institute of Medicine, Kathmandu, Nepal
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Palleria C, Leporini C, Chimirri S, Marrazzo G, Sacchetta S, Bruno L, Lista RM, Staltari O, Scuteri A, Scicchitano F, Russo E. Limitations and obstacles of the spontaneous adverse drugs reactions reporting: Two "challenging" case reports. J Pharmacol Pharmacother 2013; 4:S66-72. [PMID: 24347986 PMCID: PMC3853673 DOI: 10.4103/0976-500x.120955] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Introduction: Nowadays, based on several epidemiological data, iatrogenic disease is an emerging public health problem, especially in industrialized countries. Adverse drugs reactions (ADRs) are extremely common and, therefore, clinically, socially, and economically worthy of attention. Spontaneous reporting system for suspected ADRs represents the cornerstone of the pharmacovigilance, because it allows rapid detection of potential alarm signals related to drugs use. However, spontaneous reporting system shows several limitations, which are mainly related to under-reporting. In this paper, we describe two particular case reports, which emphasize some reasons of under-reporting and other common criticisms of spontaneous reporting systems. Materials and Methods: We performed a computer-aided search of Medline, PubMed, Embase, Cochrane library databases, national and international databases of suspected ADRs reports in order to identify previous published case reports and spontaneous reports about the ADRs reviewed in this paper, and to examine the role of suspected drugs in the pathogenesis of the described adverse reactions. Results: First, we reported a case of tizanidine-induced hemorrhagic cystitis. In the second case report, we presented an episode of asthma exacerbation after taking bimatoprost. Through the review of these two cases, we highlighted some common criticisms of spontaneous reporting systems: under-reporting and false causality attribution. Discussion and Conclusion: Healthcare workers sometimes do not report ADRs because it is challenging to establish with certainty the causal relationship between drug and adverse reaction; however, according to a key principle of pharmacovigilance, it is always better to report even a suspicion to generate an alarm in the interest of protecting public health.
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Affiliation(s)
- Caterina Palleria
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Christian Leporini
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Serafina Chimirri
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Giuseppina Marrazzo
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Sabrina Sacchetta
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Lucrezia Bruno
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Rosaria M Lista
- Azienda Sanitaria Provinciale di Cosenza, Farmacovigilanza Territorio Paola, Italy
| | - Orietta Staltari
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Antonio Scuteri
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Francesca Scicchitano
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
| | - Emilio Russo
- Department of Science of Health, School of Medicine, University of Catanzaro, Italy and Pharmacovigilance's Centre Calabria Region, University Hospital Mater Domini, Catanzaro, Italy
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Sokolov AY, Lyubashina OA, Amelin AV, Panteleev SS. The role of noradrenalin in the pathogenesis of primary headaches. NEUROCHEM J+ 2013. [DOI: 10.1134/s1819712413040090] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Abstract
Although tension-type headache is ubiquitous, only a relatively small percentage of the population has these headaches occurring with sufficient frequency and severity to cause them to seek out medical attention. This small group, however, may have substantial impact from their disease on productivity and quality of life. Assessment of the headaches includes assessment for other headache disorders that may overlap it, such as a chronic migraine. Additionally, coexisting diseases that may contribute to the process, such as mood disorders and mechanical disorders of the spine and neck, require investigation. Treatment is optimized by appropriate use of acute medications and preventive treatments that may include drugs in the antidepressant classes along with nonpharmacologic modalities and other alternative treatments ranging from biofeedback to manual therapy to the use of botulinum toxin type A injections.
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Affiliation(s)
- Frederick Freitag
- Department of Neurosciences, Baylor University Medical Center, Dallas, TX 75231, USA.
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10
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Robiony M. Intramuscular Injection of Botulinum Toxin as an Adjunct to Total Joint Replacement in Temporomandibular Joint Ankylosis: Preliminary Reports. J Oral Maxillofac Surg 2011; 69:280-4. [PMID: 21055863 DOI: 10.1016/j.joms.2010.05.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 02/23/2010] [Accepted: 05/14/2010] [Indexed: 11/28/2022]
Affiliation(s)
- Massimo Robiony
- Department of Surgical Science, University of Udine, Udine, Italy.
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11
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Tension-Type Headache. Pain Manag 2011. [DOI: 10.1016/b978-1-4377-0721-2.00047-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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12
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Salomone S, Caraci F, Capasso A. Migraine: an overview. Open Neurol J 2009; 3:64-71. [PMID: 19888434 PMCID: PMC2771268 DOI: 10.2174/1874205x00903010064] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 01/23/2009] [Accepted: 02/02/2009] [Indexed: 11/24/2022] Open
Abstract
The pathophysiology of migraine is not completely understood and continues to be investigated. The complexity of interactions taking place in the sensory neuronal network with the mediation of all different neurotransmitters involved gives the measure of the extreme difficulty connected with the knowledge of migraine pathogenesis and in particular of its cardinal sign. Neuronal components are relevant in migraine pathophysiology: there could be a generalized interictal abnormal excitability of the cerebral cortex in migraine, possibly favoring the occurrence of spreading depression with consequent activation of the trigeminal system. Many theories have been formulated in these last sixty years about the pathogenesis of migraine and other forms of primary headache, but the problem is still far to be fully clarified. The present review is focused on the description of different theories on the migraine pathogenesis. This review is dedicated to the memory of Prof. Alfredo Bianchi.
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Affiliation(s)
| | - Filippo Caraci
- Department of Pharmaceutical Sciences, University of Catania
| | - Anna Capasso
- Department of Pharmaceutical Sciences, University of Salerno, Italy
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13
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14
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Couch JR, Lenaerts ME. Medication overuse headache: clinical features, pathogenesis and management. Drug Dev Res 2008. [DOI: 10.1002/ddr.20214] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Canter HI, Kayikcioglu A, Aksu M, Mavili ME. Botulinum Toxin in Closed Treatment of Mandibular Condylar Fracture. Ann Plast Surg 2007; 58:474-8. [PMID: 17452828 DOI: 10.1097/01.sap.0000244987.68092.6e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The topic of condylar injury in adults has generated more discussion and controversy than any other in the field of maxillofacial trauma. The treatment of condylar fractures in adults is still a highly debated theme. METHODS Patients with unilateral subcondylar or condylar neck fractures of the mandibula without any significant angulation of the condylar head were managed with closed-treatment protocol. Closed treatment was applied through the injection of 100 units of botulinum toxin A, diluted to a concentration of 20 IU/mL, into the muscles of mastication of the fractured side. Masseter and anterior fibers of temporalis muscles were reached through percutaneous extraoral route and 30 IU of the toxin was injected to each muscle. Additional 40 IU of the toxin was injected around the fractured bone fragments through transmucosal intraoral route to paralyze medial and lateral pterygoid muscles as much as possible. An asymmetric occlusal splint was applied for maxillomandibular fixation to restore the vertical height for 10 days. Functional therapy with intermaxillary guiding elastics was advocated for 2 months. RESULTS There were no complications related to either toxin injections or splint application procedures. The toxin was effective on all occasions. Fractured condylar process and ramus of the mandibula were in good approximation and remained in reduced positions. None of the patients had any occlusal disturbance, mandibular asymmetry, or joint dysfunction in the follow-up period. CONCLUSIONS We believe that modification of treatment options concerning the clinical situation of the patients is the best method for condylar injury. The purpose of this study is to present and discuss the results achieved in closed treatment of a selected group of patients with mandibular condylar fractures to whom botulinum toxin A was injected to relieve the spasm of muscles of mastication, along with special splint application.
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Affiliation(s)
- Halil Ibrahim Canter
- Hacettepe University, Faculty of Medicine, Department of Plastic and Reconstructive Surgery, Ankara, Turkey.
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16
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Tension-Type Headache. Pain Manag 2007. [DOI: 10.1016/b978-0-7216-0334-6.50047-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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17
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Abstract
Schwartz-Jampel syndrome (SJS) is a rare congenital disorder of continuous myotonia, causing visual and eyelid problems such as blepharospasm, acquired ptosis, and blepharophimosis. We report the management of blepharospasm in two sisters with Schwartz-Jampel syndrome with application of botulinum toxin type A (BTX-A), as an alternative to the surgical treatments, such as orbicularis oculi myectomy, levator aponeurosis resection, and lateral canthopexy as described in the literature. Three consequent doses of commercially available BTX-A (Botox-Allergan, Inc. 100 u/via) were injected to orbicularis oculi muscle in two sisters with Schwartz-Jampel syndrome. At the least, the authors waited for a six-month interval to prevent development of sensitivity to BTX-A in patients. No significant improvement was observed after the injection of first dose of BTX-A, with the total dose of 25 units of BTX-A to each orbicularis oculi muscle of the eyes. The muscle tone weakened after the second dose, which was the twice as such of the first applied total dose (50 units of BTX-A to each orbicularis oculi muscle of the eyes) and significant functional and cosmetic improvements were achieved after injection of the third dose, in which the total applied dose was the same as the one applied in second dose. The blepharospasm and eyelid alterations caused by Schwartz-Jampel syndrome should be treated to provide functional and cosmetic improvements. Application of BTX-A to orbicularis oculi muscle for the treatment of blepharospasm could be considered as an alternative to levator resection, and lateral canthopexy in Schwartz-Jampel syndrome.
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Affiliation(s)
- Ibrahim Vargel
- Department of Plastic and Reconstructive Surgery, Kirikkale University Faculty of Medicine, Kirikkale, Turkey
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Abstract
Intraoral splints are effective in migraine prevention. In this review, changes in the quality of life of migraineurs treated with a palatal nonoccluding splint were measured. Using the Migraine Specific Quality of Life Instrument (Version 2.1), it was found that the palatal nonoccluding splint significantly improved the quality of life of migraineurs. The role of the craniomandibular muscles in the pathophysiology of migraine is also discussed.
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Affiliation(s)
- Elliot Shevel
- The Headache Clinic, Suite 256, P Bag X2600, Houghton, 2014, South Africa.
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Abstract
Rebound-withdrawal headache (medication overuse headache) is a problem that affects 1% of the population or perhaps more. Work from many countries has shown this to be a worldwide problem. It appears that the rebound-withdrawal headache often occurs on the background of pre-existing migraine or tension headache and may assume the phenotype of chronic migraine or chronic tension-type headache. The key feature of this entity is that the patient initially uses a symptomatic treatment for headache with good result. Use of this medication may increase over time, but as the use increases to more than 10 to 15 days per month, headache frequency may also increase, reaching a point where metabolic processing of the medication and removal from the system triggers another headache. The patient then finds that as use of the medication increases, the frequency and intensity of the headaches also increases, and the overall headache worsens. Once this pattern is established, therapy requires removal of the medication in order for the rebounding process to be terminated. Preventative antimigraine medications will not work in the presence of the rebound phenomenon. Once the rebound-withdrawal headache is established, it is difficult to treat. After withdrawal of the medication, there is often a high relapse rate of using the medication again with redevelopment of the rebound-withdrawal headache. Even in patients who do not relapse to drug use, headache usually remains a major problem. Recognition and treatment of rebound headache are key factors in management of these patients. Perhaps more important in regard to this entity is recognizing its existence and preventing patients from entering a pattern of rebound withdrawal, which can be achieved by early attention to their use of analgesic narcotic or migraine-abortive medications. Overall, it is likely that this will continue to be an increasing worldwide problem in managing patients with headache.
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Affiliation(s)
- James R Couch
- Department of Neurology, Oklahoma University Health Sciences Center, 711 Stanton L. Young Boulevard, PO Box 29601, Suite 215, Oklahoma City, OK 73190, USA.
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Kino Y, Tanabe M, Honda M, Ono H. Involvement of Supraspinal Imidazoline Receptors and Descending Monoaminergic Pathways in Tizanidine-Induced Inhibition of Rat Spinal Reflexes. J Pharmacol Sci 2005; 99:52-60. [PMID: 16127244 DOI: 10.1254/jphs.fp0050520] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
The neuronal pathways involved in the muscle relaxant effect of tizanidine were examined by measurement of spinal reflexes in rats. Tizanidine (i.v. and intra-4th ventricular injection) decreased the mono- and disynaptic (the fastest polysynaptic) reflexes (MSR and DSR, respectively) in non-spinalized rats. Depletion of central noradrenaline by 6-hydroxydopamine abolished the depressant effect of tizanidine on the MSR almost completely and attenuated the effect on the DSR. Co-depletion of serotonin by 5,6-dihydroxytryptamine and noradrenaline resulted in more prominent attenuation of tizanidine-induced inhibition of the DSR. Supraspinal receptors were then studied using yohimbine- and some imidazoline-receptor ligands containing an imidazoline moiety. Idazoxan (I1, I2, I3, and alpha2), efaroxan (I1, I3, and alpha2), and RX821002 (I3 and alpha2), but not yohimbine, an alpha2-adrenergic receptor antagonist with no affinity for I receptors, antagonized the inhibitory effects of tizanidine. Thus, supraspinal I receptors (most likely I3) and descending monoaminergic influences are necessary for tizanidine-induced inhibition of spinal segmental reflexes.
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Affiliation(s)
- Yurika Kino
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan
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