Copyright © 2010 MagVenture - Any kind of reproduction is prohibited Motor Threshold Introduction to MEP Monitor Guideline for performing motor threshold. - ppt download

Copyright © 2010 MagVenture - Any kind of reproduction is prohibited Motor Threshold Introduction to MEP Monitor Guideline for performing motor threshold. - ppt download: MT Background When performing Transcranial Magnetic Stimulation (TMS) the relative intensity or strength of stimulation is often referred to as % of Motor Threshold (MT). MT is a patient specific value for each subject or patient which is demined before the TMS session. When a magnetic coil is discharged over the motor cortex and the discharge energy is over threshold value neurons are activated and the targeted muscles might twitch. MT is regarded as an indicator for the subject ability to respond to TMS or an indicator for the relative cortical excitability. Some patients have a high TMS value other a lower value. In the literature MT is the most common reference measure for stimulation intensity. The visible twitch is associated with an electrical signal from the muscle action or a Motor Evoked Potential (MEP) which can be recorded by surface electrodes connected to an EMG instrument (MEP Monitor). The signal obtained gives information about: Time between the TMS pulse and the onset of TMS (latency time). MT the minimum TMS energy required to evoke a MEP. The size of MEP. TMS Muscle Peripheral Motor Nerve Efferent Electrodes Vertebral column