We analysed the present state of those SMON patients with severely disturbed visual acuity. In medical screening of SMON Research Group at 1999, 52 out of 1,083 patients and 549 out of 1128 had their histories of complete blindness and complete loss of locomotion ability at the onset of SMON, respectively. Eighty one out of 1,149 patients showed severe visual impairment, including 22 with complete blindness. The number of patients with complete loss of locomotion and that of gait with cane/assistance were 59 and 443, respectively. Then, a large number of SMON patients have been still suffering from sequelae of clioquinol intoxication. Those patients groups with blindness and severe visual acuity yet showed after 30 years more severe disorders in locomotive activity, muscle strength and spasticity of lower extremities, degree of dysesthesia as well as vibratory sensory deficit, and ADL score. Those patients with complete or near complete blindness were profoundly handicapped so that the ratio of patients with a life-long institutionalization was high compared to the groups with less severe visual disturbance. Thus, it seems necessary to make a more extensive and meticulous supports for those SMON patients with blindness as they are in need of more finance and care providers.
Download full-text PDF |
Source |
---|
Mol Genet Genomic Med
June 2024
Department of Pediatrics, Gifu University Graduate School of Medicine, Gifu University, Gifu, Japan.
Background: Subacute myelo-optico-neuropathy (SMON) is a neurological disorder associated with the administration of clioquinol, particularly at very high doses. Although clioquinol has been used worldwide, there was an outbreak of SMON in the 1950s-1970s in which the majority of cases were in Japan, prompting speculation that the unique genetic background of the Japanese population may have contributed to the development of SMON. Recently, a possible association between loss-of-function polymorphisms in NQO1 and the development of SMON has been reported.
View Article and Find Full Text PDFJ Sleep Res
August 2023
Centre for Functional Genomics and Bio-Chips, Institute of Biochemistry and Molecular Genetics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
Obstructive sleep apnea is the most common sleep-related breathing disorder worldwide and remains underdiagnosed. Its multiple associated comorbidities contribute to a decreased quality of life and work performance as well as an increased risk of death. Standard treatment seems to have limited effects on cardiovascular and metabolic aspects of the disease, emphasising the need for early diagnosis and additional therapeutic approaches.
View Article and Find Full Text PDFFront Pharmacol
October 2022
School of Pharmacy, University of Tasmania, Hobart, TAS, Australia.
Clioquinol (CQ) was widely used as oral antibiotic before being taken off the market in many countries in 1970, after it was linked to subacute myelo-optic neuropathy (SMON) in Japan, leading to vision loss with many patients left wheelchair-bound. The common pathology of CQ-associated SMON was reproduced in animals but none of the proposed modes of toxicity explained the restriction of CQ-induced SMON to Japan. Given a re-emergence of CQ and related analogues as neuroprotectants, it is crucial to understand the underlying mechanism of CQ-induced toxicity to prevent any potential CQ-associated risks to future patients.
View Article and Find Full Text PDFMol Genet Genomic Med
January 2022
Department of Pediatrics, Gifu University Graduate School of Medicine, Gifu University, Gifu, Japan.
Background: Subacute myelo-optico-neuropathy (SMON) is a severe neurological disorder associated with clioquinol administration, which frequently occurred in Japan during the 1950s and 1960s. The unique genetic background of the Japanese population is considered to be strongly involved in the development of this neurological disease. Recently, genetic variants of ABCC4 (OMIM: 605250) and ABCC11 (OMIM: 607040), which are particularly common in the Japanese population, were suggested as possible genetic susceptibility factors for the development of SMON.
View Article and Find Full Text PDFRinsho Shinkeigaku
February 2021
Department of Neurology, National Hospital Organization Suzuka Hospital.
SMON (subacute myelo-optico-neuropathy) is toxic neurological disease which had a profound impact on the population in Japan in 1960's. The clinical characteristics of SMON includes an ascending sensory disturbance, spasticity, and visual impairment typically following abdominal symptoms. Infection was first suspected as an underlying cause of this epidemic.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!