The FrontalCortex question bank can help you study for the Psychiatry Resident-In-Training Examination (PRITE exam).

Repetitive Stimulation for Lambert-Eaton Syndrome (pre-synaptic neuromuscular junction defect)

Last updated on Tuesday, October 6 2009 by blondarb

peer review status unavailable
rating unavailable

The most common rapid repetitive stimulation studies are recorded from the Median (APB) or Ulnar (ADM) motor nerves.  However, rapid repetitive stimulation studies can be performed on any motor nerve.

After performing the routine motor nerve conduction study distally, Postexercise motor responses evaluations are performed before considering rapid repetitive stimulation.  The following procedure should be used (this could be done on any motor nerve):

1.    Obtain a supramaximal distal motor response.

2.    Exercise the recording muscle for 10 seconds.

3.    Repeat a single stimulation at the same site with the same current.

4.    An increment of more than 50 – 100% is a positive finding.

Consider performing (for confirmation) with the physician a rapid tetanic stimulation.  Obtain a supramaximal distal motor response from the median or ulnar nerves.  Change the settings of the repetitive stimulations into 30 or 50 Hz and the number of stimuli to 200.  Stabilize the hand and wrist (with two hands (or a board) and explain to the patient that this very painful but brief.  Stimulate the train once.  An increment of more than 50 – 100% is a positive finding.

Categories (tags) users associate with this resource what is this?
Click on a tag to find related images, videos, MCQs, and other resources.
Check the boxes next to the tags you consider relevant or enter your own tags in the field below.
You must be logged in to edit tags.
Top 5 tags for this item:
more tags:
new tag:

0 user entries
Please log in if you'd like to add a comment.