Ann Rehabil Med.  2015 Apr;39(2):253-261. 10.5535/arm.2015.39.2.253.

Can Motor Evoked Potentials Be an Objective Parameter to Assess Extremity Function at the Acute or Subacute Stroke Stage?

Affiliations
  • 1Department of Physical Medicine and Rehabilitation, Chonbuk National University Medical School, Jeonju, Korea. mhko@jbnu.ac.kr
  • 2Research Institute of Clinical Medicine of Chonbuk National University and Biomedical Research Institute of Chonbuk National University Hospital, Jeonju, Korea.

Abstract


OBJECTIVE
To investigate whether motor evoked potential (MEP) amplitude ratio measurements are sufficiently objective to assess functional activities of the extremities. We also delineated the distribution between the presence or absence of MEPs and the Medical Research Council (MRC) scale for muscle strength of the extremities.
METHODS
We enrolled 183 patients with first-ever unilateral hemiplegia after stroke. The MEP parameters were amplitude ratio (amplitude of affected side/amplitude of unaffected side) recorded at the first dorsal interosseous (FDI) and tibialis anterior (TA) muscles. We performed frequency analyses using the MRC scale for muscle strength and the presence or absence of evoked MEPs. Change on the MRC scale, hand function tests (HFTs), and the Modified Barthel Index (MBI) subscore were compared between the evoked MEP and absent MEP groups using the independent t-test. Receiver operating characteristic curves were used to determine the optimal cutoff scores for the MEP amplitude ratio using the HFT results and MBI subscores. Correlations between the MEP amplitude ratio and the MRC scale, HFTs, and MBI subscore were analyzed.
RESULTS
About 10% of patients with MRC scale grades 0-2 showed evoked MEPs at the FDI muscle, and 4% of patients with MRC scale grades 3-5 did not show MEPs. About 18% of patients with MRC scale grades 0-2 showed evoked MEPs at the TA muscle, and 4% of patients with MRC scale grades 3-5 did not show MEPs. MEP amplitude increased with increasing MRC scale grade. The evoked MEP group had more significant changes on the MRC scale, HFT, and the climbing stair score on the MBI than those in the group without MEPs. Larger MEP amplitude ratios were observed in patients who had more difficulty with the HFTs and ambulation. The MEP amplitude ratio was significantly correlated with the MRC scale, HFT, and MBI subscore.
CONCLUSION
We conclude that the MEP amplitude ratio may be useful to predict functional status of the extremities in patients who suffered stroke.

Keyword

Motor evoked potentials; Muscle strength; Activities of daily living; Motor skills; Stroke

MeSH Terms

Activities of Daily Living
Evoked Potentials, Motor*
Extremities*
Hand
Hemiplegia
Humans
Motor Skills
Muscle Strength
Muscles
ROC Curve
Stroke*
Walking

Figure

  • Fig. 1 Amplitude ratio distribution using the Medical Research Council (MRC) scale for muscle strength for the first dorsal interosseous (FDI, A) and tibialis anterior (TA, B) muscles.

  • Fig. 2 Cutoff values of motor evoked potential (MEP) amplitude ratio for grip power (A), the Box and Block test (B), the nine-hole peg test (C), ambulation (D), and stair climbing (E). Larger MEP amplitude ratios indicated more difficulties with the hand function tests and the level of ambulation.


Cited by  2 articles

Prediction of Motor Recovery Using Quantitative Parameters of Motor Evoked Potential in Patients With Stroke
Jae Yong Jo, Ahee Lee, Min Su Kim, Eunhee Park, Won Hyuk Chang, Yong-Il Shin, Yun-Hee Kim
Ann Rehabil Med. 2016;40(5):806-815.    doi: 10.5535/arm.2016.40.5.806.

Diagnostic Challenge of Diffusion Tensor Imaging in a Patient With Hemiplegia After Traumatic Brain Injury
Hye Eun Shin, Hoon Chang Suh, Si Hyun Kang, Kyung Mook Seo, Don-Kyu Kim, Hae-Won Shin
Ann Rehabil Med. 2017;41(1):153-157.    doi: 10.5535/arm.2017.41.1.153.


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