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慢性腰下肢痛の原因の1つとして脊髄後角における中枢感作の存在が考えられる.慢性腰下肢痛を訴える20症例に対して塩酸nicardipineくも膜下投与を行い,その鎮痛効果を検討した.VASによる疼痛自己評価では投与前9.3から最終経過観察時4.4と改善がみられていた.髄液中硝酸イオン濃度も同様に投与前26.4uM/Lから4週後15.4uM/Lと低下がみられた.Nicardipineによる鎮痛機序はNMDA-NO産生系の抑制にあるのではないかと考えられ,慢性疼痛において中枢感作が治療対象となりえる可能性がある.
It is postulated that central sensitization of the spinal dorsal horn contributes to chronic low back pain. The purpose of this study is to investigate the clinical value of intrathecal administration of nicardipine hydrochloride, an L-type calcium antagonist, for chronic low back pain. Twenty low back pain cases underwent intrathecal administration of nicardipine hydrochloride. The visual analog scale (VAS) revealed improvement of pain. VAS scores were 9.3 and 4.4 at preadministration and final observation, respectively. The NO3- concentration in cerebro-spinal fluid (CSF) was diminished at 4 weeks after intrathecal administration of nicardipine hydrochloride (pre-administration:26.4uM/L and 4 weeks:15.4uM/L). A correlation was recognized between VAS improvement and a decline in the CSF NO3- concentration. Nicardipine hydrochloride may inactivate N-methyl-D-asparate (NMDA) receptors, followed by NO production in spinal dorsal horn. Central sensitization in chronic low back pain should be considered in designing therapeutic strategies.
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