Impaired pain processing in Parkinson's disease and its relative association with the sense of smell

Takashi Hara, Masaaki Hirayama, Yasuaki Mizutani, Tetsuo Hama, Norio Hori, Tomohiko Nakamura, Shigenori Kato, Hirohisa Watanabe, Gen Sobue

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Background and purpose: Many non-motor symptoms are associated with Parkinson's disease (PD). Of these, pain and olfactory disturbance tend to be common premotor symptoms. PD has been shown to exhibit abnormal central pain processing, although underlying mechanisms are not yet fully understood. In order to investigate this further, we assessed PD patients by specific Aδ stimulation with intra-epidermal needle electrode and determined olfactory function. Methods: Forty-two patients (18 males and 24 females) with PD and 17 healthy control subjects (8 males and 9 females) were studied. A thin needle electrode was used to stimulate epidermal Aδ fibers, and somatosensory evoked potentials (SEPs) recorded at the vertex. Olfactory function was evaluated using the Odor Stick Identification Test for Japanese (OSIT-J) and its relationship with pain-related SEPs was investigated. Results: There were no significant differences in N1 latencies or P1 latencies although N1/P1 peak-to-peak amplitudes were significantly lower (p < 0.01) in PD patients than in control subjects. In PD patients, there were significant correlations between N1/P1 amplitudes and disease duration (r = -0.35, p < 0.05), Hoehn-Yahr stage (r = -0.38, p < 0.05) and UPDRS part III (r = -0.42, p < 0.01). Furthermore, the OSIT-J scores correlated with SEP amplitude (r = 0.41, p < 0.01). Conclusion: Pain processing in PD patients was impaired under specific nociceptive stimulation of Aδ fibers and significant correlation with smell dysfunction was detected. We suggest that this mechanism may involve the limbic system during PD pathology.

本文言語English
ページ(範囲)43-46
ページ数4
ジャーナルParkinsonism and Related Disorders
19
1
DOI
出版ステータスPublished - 01-2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 神経学
  • 老年医学
  • 臨床神経学

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