石鎚　啓 （イシヅチ　ケイ）

Ishizuchi, Kei

写真a

所属（所属キャンパス）

医学部 内科学教室（神経） （信濃町）

職名

助教（有期）
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  • Worsening of myasthenic symptoms associated with statins

    Sugimoto T., Suzuki S., Uzawa A., Yamawaki T., Masuda M., Minami N., Kawaguchi N., Kubota T., Takahashi M.P., Suzuki Y., Watanabe G., Konno S., Kimura T., Samukawa M., Ishizuchi K., Akamine H., Onishi Y., Yasuda M., Nagane Y., Maruyama H., Murai H., Utsugisawa K.

    Journal of the Neurological Sciences 464 2024年09月

    ISSN  0022510X

    　概要を見る

    Introduction/Aims: The common presentations of statin intolerance are muscle-specific symptoms. Although statins are one type of drug reported to cause myasthenic worsening, myasthenic worsening has not been recognized as statin intolerance. The purpose of the present study is to investigate in a large cohort the safety profiles of statins in patients with myasthenia gravis (MG). Methods: A total of 1710 consecutive patients with MG who visited sites associated with the Japan MG registry 2021 group between April and October 2021 were reviewed. Statin-associated myasthenic worsening was defined as worsening of any myasthenic symptoms on statin use and improvement of the symptom by stopping the statin or by undertaking additional treatment with patient and doctor confirmation. Results: Among the 400 patients who used statins, 8 (2%) patients experienced statin intolerance and 6 (1.5%) patients experienced myasthenic worsening. No patients developed MG on the statin. Ptosis was a main symptom of myasthenic worsening in 4 (67%) patients. Atorvastatin was used in all patients with statin-associated myasthenic worsening. The symptoms of statin intolerance and statin-associated myasthenic worsening were improved within 2 months and 3 months, respectively, in all patients by cessation of statin use. Discussion: Regarding statin-associated myasthenic worsening, prevalence was low, and severity was mild; with cessation of statin use, symptoms improved within a few months, and outcomes were generally good. Although statins can be used in MG patients with little concern, statin-associated myasthenic worsening should be noted in addition to the classical statin intolerance associated with statin use.

  • Efficacy and tolerability of 100 mg of lasmiditan for migraine: A multi-center, prospective observational real-world study in Japan

    Ishii R., Ishizuchi K., Watanabe N., Fukazawa R., Trivedi M., Nakahara J., Takizawa T.

    Cephalalgia 44 （ 6 ）  2024年06月

    ISSN  03331024

    　概要を見る

    Background: Real-world data on the effectiveness and safety of lasmiditan, a new medication for acute migraine attacks, is necessary. Methods: We performed a prospective, observational, multi-center, real-world study. A total of 48 patients with migraine (44 females, 44.6 ± 12.9 years old) were included in this study. Results: Twenty-three patients (47.9%) reported they were headache-free two hours after taking lasmiditan and were categorized into the responder group. In total, 44 patients (91.7%) experienced at least one side effect within two hours of taking the medication. Dizziness, somnolence, malaise, nausea, and palpitations were reported by 56.3% (n = 27), 45.8% (n = 22), 37.5% (n = 18), 20.8% (n = 10), and 14.6% (n = 7) of patients respectively. Of 48 patients, 20 (41.7%) indicated that they preferred lasmiditan to their previous acute treatment. There were no predictive factors for efficacy. Conclusion: This real-world study demonstrated the efficacy and safety of lasmiditan. More than 90% of patients experienced side effects from lasmiditan. Approximately 40% of patients preferred lasmiditan despite the occurrence of side effects.

  • Real-world experience with eculizumab and switching to ravulizumab for generalized myasthenia gravis

    Tokuyasu D., Suzuki S., Uzawa A., Nagane Y., Masuda M., Konno S., Kubota T., Samukawa M., Sugimoto T., Ishizuchi K., Oyama M., Yasuda M., Akamine H., Onishi Y., Suzuki Y., Kawaguchi N., Minami N., Kimura T., Takahashi M.P., Murai H., Utsugisawa K.

    Annals of Clinical and Translational Neurology 11 （ 5 ） 1338 - 1346 2024年05月

    　概要を見る

    Objective: Eculizumab and ravulizumab are complement protein C5 inhibitors, showing efficacy and tolerability for patients with anti-acetylcholine receptor-positive (AChR+) generalized myasthenia gravis (gMG) in phase 3 clinical trials and subsequent analyses. The purpose of the present study was to evaluate the clinical significance of eculizumab and switching to ravulizumab for refractory AChR+ gMG patients in the real-world experience. Methods: Among the database of Japan MG registry survey 2021, we studied AChR+ gMG patients who received eculizumab. We also evaluated these patients who switched from eculizumab to ravulizumab. Responder was defined as an improvement of at least 3 points in MG-ADL. We performed a questionnaire of preference between eculizumab and ravulizumab. Results: Among 1,106 patients with AChR+ gMG, 36 patients (3%) received eculizumab (female 78%, mean age 56.0 years). Eculizumab was preferentially used in severe and refractory MG patients. The duration of eculizumab treatment was 35 months on average. MG-ADL improved from 9.4 ± 4.9 to 5.9 ± 5.1, and 25 (70%) of the 36 gMG patients were responders. Postintervention status was markedly improved after the eculizumab treatment. Of 13 patients who did not continue eculizumab, 6 showed insufficiencies. Early onset MG was most effective. However, 15 patients switching from eculizumab to ravulizumab kept favorable response and tolerability. Questionnaire surveys showed preference for ravulizumab over eculizumab. Interpretation: Eculizumab and switching to ravulizumab showed to be effective for refractory AChR+ gMG patients in clinical settings.

  • Serious Bacterial Infections Associated with Eculizumab: A Pharmacovigilance Study

    Okusa S., Takizawa T., Imai S., Oyama M., Ishizuchi K., Nakahara J., Hori S., Suzuki S.

    Internal Medicine 63 （ 8 ） 1061 - 1066 2024年

    ISSN  09182918

    　概要を見る

    Objective Molecular-targeted agents, including eculizumab and rituximab, are considered treatment options for refractory myasthenia gravis (MG), but bacterial infections can occur as serious adverse events when using these agents. The present study elucidated the relative risks of bacterial infections associated with eculizumab and rituximab using a pharmacovigilance database. Methods We analyzed eculizumab- and rituximab-associated adverse events reported between 2007 and 2021 in the US Food and Drug Administration Adverse Event Reporting System (FAERS) and herein report a refractory MG patient who developed streptococcal toxic shock syndrome during eculizumab treatment. Patients We evaluated a 74-year-old Japanese woman with refractory MG who developed severe bacteremia after receiving eculizumab. Results A total of 44,215 and 108,485 adverse events were reported with eculizumab and rituximab, respectively, from among 13,742,321 individual case safety reports in the FAERS database after data cleaning. We found a strong association between eculizumab and Neisseria infections. In contrast, we found only one case of meningococcal meningitis treated with rituximab. Both eculizumab and rituximab were weakly associated with streptococcal infections. Two cases of streptococcal toxic shock syndrome were associated with rituximab. Conclusion Careful monitoring of serious bacterial infections associated with eculizumab treatment is warranted.

  • Prevalence of Primary Headache in Nurses in Japan: A Cross-sectional Single-center Study

    Sekiguchi K., Huh S., Watanabe N., Miyazaki N., Ishizuchi K., Iba C., Tagashira Y., Shibata M., Takemura R., Nakahara J., Takizawa T.

    Internal Medicine 63 （ 9 ） 1217 - 1222 2024年

    ISSN  09182918

    　概要を見る

    Objective This study examined the prevalence of migraine in nurses in Japan, which, to our knowledge, has not been documented in English. Methods From April to May 2021, we administered a questionnaire to 229 nurses working at Keio University Hospital to investigate the prevalence and characteristics of headache among nurses in Japan. Headaches were classified as migraine or tension-type headache (TTH) based on the International Classification of Headache Disorders 3rd edition (ICHD-3). Results In total, 80 patients (34.9%) had primary headaches, including 47 (20.5%) with migraine and probable migraine and 33 (14.4%) with TTH and probable TTH. We found a significant difference in the Numerical Rating Scale score, nausea and vomiting, photophobia, phonophobia, and aggravation by routine physical activity between migraine and TTH. The specificities for a migraine diagnosis were 100% and 93.9% for nausea/vomiting and photophobia, respectively. Only 8.8% of patients had their headaches diagnosed by a physician. Conclusion Migraines have a high prevalence (>20%) among nurses and are often under-diagnosed. In many cases, headache-associated symptoms are more important than laterality or other characteristics for the diagnosis. Many nurses are treated for headaches without a correct diagnosis. Further education regarding primary headaches may be necessary for health practitioners as well as society.

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