EVOKED-POTENTIAL STUDIES IN THALAMIC HEMORRHAGE

Authors
Citation
Uk. Misra et J. Kalita, EVOKED-POTENTIAL STUDIES IN THALAMIC HEMORRHAGE, Clinical neurology and neurosurgery, 98(4), 1996, pp. 291-298
Citations number
36
Categorie Soggetti
Clinical Neurology",Surgery
ISSN journal
03038467
Volume
98
Issue
4
Year of publication
1996
Pages
291 - 298
Database
ISI
SICI code
0303-8467(1996)98:4<291:ESITH>2.0.ZU;2-T
Abstract
Due to paucity of a comprehensive study on somatosensory and motor evo ked potentials in thalamic hemorrhage, the present study has been unde rtaken. Clinical examination, motor evoked potential(MEP) and median s omatosensory evoked potential(SEP) studies were performed on 22 consec utive patients with CT-proven thalamic hemorrhage. The clinical and ev oked potential studies were carried out on admission and repeated at t he end of 3 months. The hematomas were classified as type A (with post erolateral extension) and type B (without posterolateral extension). T he hematomas were of type A and type B in II patients each. The patien ts with type A hematomas had persistent inexcitability of motor pathwa ys and SEPs were unrecordable. In type B, MEP was not recordable in th ree, prolonged in five and normal in three patients; in all these pati ents, MEP returned to normal in the follow-up study. The cortical pote ntials of median SEP were normal in four and unrecordable in five pati ents with type B hematoma. In the follow-up study, SEPs became recorda ble in all, although central sensory conduction time (CSCT) was prolon ged in three patients. MEP and SEPs were related to the respective mot or and sensory dysfunction and to posterolateral extension of hematoma . Patients with type A hemorrhage had worse prognosis compared to type B, emphasising the importance of posterolateral extension. A persiste ntly unrecordable MEP and SEP in thalamic hemorrhage suggests a poster olateral extension which predicts a poor outcome.