Clin Pain.  2020 Jun;19(1):23-27. 10.35827/cp.2020.19.1.23.

Application of Segmental Phase Angle for Assessment of Post-Stroke Complex Regional Pain Syndrome

  • 1Department of Rehabilitation Medicine, Inje University Haeundae Paik Hospital, Busan, Korea
  • 2Department of Rehabilitation, Epworth Rehabilitation, Epworth Healthcare, Hawthorn, VIC, Australia


Our objective is to evaluate the applicability of segmental phase angle (PhA) via bioelectrical impedance analysis (BIA) for post-stroke complex regional pain syndrome (CRPS). Due to its noninvasiveness and convenience, various studies have used BIA in clinical conditions. We measured segmental PhA in 4 patients at the time of CRPS diagnosis and repeated 4 weeks after 2 weeks of steroid pulse therapy. In 3 cases, the affected-to-unaffected ratio of the upper limb PhA decreased at the time of diagnosis. In 2 cases with improvement of more than 5 points in the CRPS severity score (CSS), increased ratios were observed. In other 2 cases with improvement of less than 4 points in the CSS, no remarkable changes in the ratios were found. We suggest that the segmental PhA can be helpful in assessment of post-stroke CRPS and its recovery.


Stroke; Electric impedance; Complex regional pain syndrome
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