Evaluation of hyperbaric oxygen therapy for spinal cord injury in rats with different treatment course using diffusion tensor imaging

Abstract

Study design

Animal study.

Objectives

To evaluate the efficacy of hyperbaric oxygen (HBO) therapy for spinal cord injury (SCI) in rats with different treatment course using diffusion tensor imaging (DTI).

Setting

Hospital in Fuzhou, China.

Methods

Fifty adult Sprague-Dawley rats were grouped as: (A) sham-operated group (n = 10); (B) SCI without HBO therapy group (n = 10); (C) SCI with HBO therapy for 2 weeks (SCI+HBO2W) group (n = 10); (D) SCI with HBO therapy for 4 weeks (SCI+HBO4W) group (n = 10); (E) SCI with HBO therapy for 6 weeks (SCI+HBO6W) group (n = 10). Basso Beattie Bresnahan (BBB) scores and diffusion tensor imaging parameters including fractional anisotropy (FA), mean diffusivity (MD), radial diffusion (RD), and axial diffusion (AD) values in the injury epicenter, as well as 2 mm rostral and caudal to the injury epicenter were collected and analyzed 6 weeks post-injury.

Results

Higher BBB score and FA values were found in the SCI+HBO4W group than in the SCI and SCI+HBO2W groups (all P < 0.05), whereas no significant differences of these metrics were observed between the SCI+HBO4W and SCI+HBO6W groups. MD and RD values of the SCI+HBO4W group were significantly lower than those of the SCI group (all P< 0.01). FA values were positively correlated with BBB scores. MD and RD values were negatively correlated with BBB scores.

Conclusion

DTI parameters, especially FA, could non-invasively and quantifiably evaluate the efficacy of HBO treatment for rats with SCI and 4 weeks may be the more appropriate treatment course.

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Acknowledgements

This work was supported by the Natural Science Foundation of Fujian Province (No. 2016J01526).

Funding

This work was supported by the Natural Science Foundation of Fujian Province (No. 2016J01526).

Author contributions

Fang Liu: Project development and assistance with manuscript writing; Libin Yang: Assistance with experimental operation, data collection and manuscript writing; Jianyi Liu: Assistance with experimental operation; Yijing Zhao: Assistance with experimental operation; Zebin Xiao: Assistance with manuscript writing; Yingyan Zheng: Assistance with manuscript preparation; Zhen Xing: Assistance with manuscript preparation; Yuyang Zhang: Assistance with manuscript preparation; Dairong Cao: Project development and assistance with manuscript writing.

Author information

Correspondence to Fang Liu or Dairong Cao.

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