TY - JOUR
T1 - State of intracortical inhibitory interneuron activity in patients with chronic stroke
AU - Honaga, Kaoru
AU - Fujiwara, Toshiyuki
AU - Tsuji, Tetsuya
AU - Hase, Kimitaka
AU - Ushiba, Junichi
AU - Liu, Meigen
N1 - Funding Information:
This study was partially supported by a Grant-in-Aid for Scientific Research (C) (23500619) and the Strategic Research Program for Brain Sciences (SRPBS) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2013/2
Y1 - 2013/2
N2 - Objectives: Few studies have assessed short intracortical inhibition (SICI) in the affected hemisphere (AH) in a large number of patients with chronic stroke. In this study, SICI was assessed in chronic stroke patients with severe hemiparesis, and its relationship to clinical parameters was examined. Methods: The participants were 72 patients with chronic hemiparetic stroke. SICI of both the AH and the unaffected hemisphere (UH) was assessed. The relationships between SICI and the location of lesion, time from onset, and finger function were studied. Motor function of the paretic finger was assessed with the Stroke Impairment Assessment Set (SIAS) and the Fugl-Meyer test upper extremity motor score. To compare the results with those of healthy subjects, SICI was assessed in seven age-matched control subjects. Results: MEPs of the UH were evoked in all 72 subjects, and MEPs of the AH were evoked in 24 subjects. SICI of the AH was inversely correlated with paretic finger motor function and time from stroke onset. SICI of the UH was not correlated with either one. SICI of the UH was higher in the cortical lesion group than in the control group. Conclusions: The state of intracortical inhibitory neuron activity depends on the state of motor function and lesion site even in chronic stroke patients with severe hemiparesis. Significance: The inhibitory system of the AH is involved in functional recovery of the paretic hand even in the chronic stage of stroke.
AB - Objectives: Few studies have assessed short intracortical inhibition (SICI) in the affected hemisphere (AH) in a large number of patients with chronic stroke. In this study, SICI was assessed in chronic stroke patients with severe hemiparesis, and its relationship to clinical parameters was examined. Methods: The participants were 72 patients with chronic hemiparetic stroke. SICI of both the AH and the unaffected hemisphere (UH) was assessed. The relationships between SICI and the location of lesion, time from onset, and finger function were studied. Motor function of the paretic finger was assessed with the Stroke Impairment Assessment Set (SIAS) and the Fugl-Meyer test upper extremity motor score. To compare the results with those of healthy subjects, SICI was assessed in seven age-matched control subjects. Results: MEPs of the UH were evoked in all 72 subjects, and MEPs of the AH were evoked in 24 subjects. SICI of the AH was inversely correlated with paretic finger motor function and time from stroke onset. SICI of the UH was not correlated with either one. SICI of the UH was higher in the cortical lesion group than in the control group. Conclusions: The state of intracortical inhibitory neuron activity depends on the state of motor function and lesion site even in chronic stroke patients with severe hemiparesis. Significance: The inhibitory system of the AH is involved in functional recovery of the paretic hand even in the chronic stage of stroke.
KW - Cerebrovascular disease
KW - Intracortical inhibition
KW - Motor cortex
KW - Transcranial magnetic stimulation
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U2 - 10.1016/j.clinph.2012.08.005
DO - 10.1016/j.clinph.2012.08.005
M3 - Article
C2 - 22955029
AN - SCOPUS:84872367163
SN - 1388-2457
VL - 124
SP - 364
EP - 370
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
IS - 2
ER -