Central motor conduction time in malnourished children
Division of
Neurology, Institute of Medical Sciences BHU, Varanasi, and Section of
Paediatric Neurology, Department of Neurosciences, JLN Hospital and
Research Centre, Bhilai MP 490006, India
Correspondence to: Dr S K Tamer, Department of Pediatrics and Neurology, 644, `Samidha', Sindhia Nagar, PO-Durg MP 491001, India.
Accepted 17 February 1997
The functional status of the descending motor pathways was
assessed in malnourished children using transcranial electromagnetic stimulation of the cortex. Twenty children with different severities of
malnutrition and 20 control subjects were studied
electrophysiologically. The circular coil of a Dentac MAG 2 magnetic
stimulator was applied tangentially over the vertex to stimulate the
cortex. The muscle evoked potential in the children's arms was
recorded from the abductor pollicis brevis muscle and in their legs
from the extensor digitorum brevis muscle on both sides of the body
using surface electrodes. The muscle evoked potential of the abductor
pollicis brevis and extensor digitorum brevis muscles was further
obtained using root stimulation by applying the coil at the cervical
and lumbar spine, respectively. The indices of cortical threshold, cortical latency, and central motor conduction time (ms) were evaluated
in both arm and leg muscles on both sides. The results showed an
increased cortical threshold (mean (SD) 1232.5 (134.06) in the study
group v 1147.5 (99.31) in the control group) for the
abductor pollicis brevis muscle and for the extensor digitorum brevis
muscle (1325.00 (115.70) in the study group v 1190.0 (125.24) in the control group). Similarly, significant prolongation of the central motor conduction time (ms) (study group 6.67 (0.91) v control group 5.71 (0.74)) in the abductor pollicis
brevis muscle was seen in malnourished children.
© 1997 by Archives of Disease in Childhood
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