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Preliminary Investigation of Pain-Related Changes in Cerebral Blood Volume in Patients With Phantom Limb Pain

Published:April 06, 2017DOI:https://doi.org/10.1016/j.apmr.2017.03.010

      Abstract

      Objective

      To investigate changes in the pain network associated with phantom limb pain, magnetic resonance imaging (MRI) was used to measure cerebral blood volume (CBV) in patients who had undergone unilateral arm amputation after electrical injury.

      Design

      Case-controlled exploratory MRI study of CBV via MRI.

      Setting

      University hospital.

      Participants

      Participants (N=26) comprised patients with phantom limb pain after unilateral arm amputation (n=10) and healthy, age-matched persons (n=16).

      Interventions

      Not applicable.

      Main Outcome Measures

      The intensity of phantom limb pain was measured using the visual analog scale (VAS). Depressive mood was assessed using the Hamilton Depression Rating Scale, and cognitive function was assessed using the Korean version of the Mini-Mental State Examination. Voxel-wise comparisons of relative CBV maps were made between amputees and controls over the entire brain volume. The relationship between individual participant CBV (measured in voxels) and VAS score was also examined.

      Results

      Compared with control participants, amputees exhibited greater degrees of depression; significantly higher CBV in the bilateral medial frontal area (orbitofrontal cortex [OFC] and pregenual anterior cingulate cortex [pACC]); and significantly lower CBV in the right midcingulate cortex, posterior cingulate cortex, and primary somatosensory cortex. CBV increased in the contralateral and ipsilateral hemispheres of the amputated arm, regardless of the amputation side. This CBV increase in the OFC and pACC was strongly correlated with pain intensity in all amputees.

      Conclusions

      We observed increased CBV in regions associated with emotion in the cerebral pain network of patients who had undergone unilateral arm amputation after electrical injury. This study suggests that CBV changes were related to neuroplasticity associated with phantom limb pain.

      Keywords

      List of abbreviations:

      ACC (anterior cingulate cortex), CBV (cerebral blood volume), HDRS (Hamilton Depression Rating Scale), MCC (midcingulate cortex), MMSE-K (Korean version of the Mini-Mental State Examination), MRI (magnetic resonance imaging), OFC (orbitofrontal cortex), pACC (pregenual anterior cingulate cortex), VAS (visual analog scale)
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