Repetitive Transcranial Magnetic Stimulation Use in Acute Stroke

When a certain area of the brain is injured, like in stroke, several events occur. One side of the body may become weak. This weakness is called hemiparesis and it may create difficulty in performing tasks like writing, eating, and walking. The weakness results from two sources: 1. death of some brain cells in the affected side (hemisphere) of the brain 2. exaggerated inhibitory signals from the unaffected hemisphere acting on surviving neurons in the affected hemisphere. Investigators cannot change neurons that have died but they may be able to change the exaggerated inhibition that impairs the surviving neurons in the affected hemisphere.The purpose of this study is to try to decrease the exaggerated inhibition coming from the unaffected hemisphere, which suppresses the affected hemisphere, with transcranial magnetic stimulation (TMS). Investigators hypothesize that, from admission to discharge, active rTMS combined with conventional therapy will produce greater functional gains in the paretic hand compared to sham rTMS combined with conventional therapy, as measured by standard tests.