Correlation of the Motor Evoked Potentials Amplitude and Hand Function of the Affected Side in Stroke.
- Author:
Soo Youn SON
1
;
Sung Hee PARK
;
Jeong Hwan SEO
;
Myoung Hwan KO
Author Information
1. Department of Physical Medicine and Rehabilitation, Chonbuk National University Medical School, Jeonju 561-712, Korea.
- Publication Type:Original Article
- Keywords:
Motor evoked potential;
Amplitude;
Hand function;
Stroke
- MeSH:
Evoked Potentials, Motor;
Extremities;
Fingers;
Hand;
Humans;
Motor Cortex;
Muscles;
Organometallic Compounds;
Stroke;
Transcranial Magnetic Stimulation
- From:Journal of the Korean Academy of Rehabilitation Medicine
2011;35(1):34-41
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: To investigate the correlation between the motor evoked potentials (MEPs) amplitude of 1st dorsal interosseus in affected limbs and affected hand function after stroke. METHOD: We enrolled 109 patients with acute and subacute 1st attack stroke. Transcranial magnetic stimulation (TMS) was applied to the motor cortex and MEP was recorded at the 1st dorsal interossei (DI) muscle. MEP parameters were latency of the affected side, latency ratio (latency of affected side/latency of unaffected side), amplitude of affected side and amplitude ratio (amplitude of affected side/latency of unaffected side). Hand function tests (HFT) including hand power measures and a nine hole peg test (NHPT) were conducted and the ratios of the value of the affected hand to unaffected hand were used for the analysis. The Korean version of the modified Barthel index (K-MBI) and the manual muscle test (MMT) of finger flexion were also evaluated. Correlation between MEP parameters and the clinical variables such as HFT, K-MBI and MMT grades were analyzed. RESULTS: While MEPs in the affected 1st DI were recorded in fifty six patients, MEPs were not recorded in forty nine patients. The responsiveness of MEPs was significantly correlated with the HFT, K-MBI and MMT grades. The amplitude ratio had the most significant correlation with the HFT and MMT grade in this MEP study. Also, the amplitude ratio had more significant correlations with the K-MBI score compared with other MEP parameters. CONCLUSION: We concluded that the amplitude ratio may be a useful MEPs parameter for indicating hand function.
