Not a medical practicioner. Merely another victim

July 1, 2010 at 9:58 am

Just to be perfectly clear, while I (almost) always give the link(s) to the data quoted, the data is just that- somebody else’s. I am not medically trained. The data I link to is merely my selection from the results pages that I search for.

On the other hand, time I have plenty of. I also find it helpful to learn about these things.

You are welcome.

Try this from Wikipedia (if you trust wiki…)


[I]”F wave measurements

Several measurements can be done on the F responses, including minimal and maximal latencies, and F wave persistence.

The minimal F wave latency is typically 25-32 ms in the upper extremities, and 45-56 ms in the lower extremities.

F wave persistence is the number of F waves obtained per the number of stimulations, which is normally 80-100% (or above 50%).[/I]”

You’ll find, as I did, that F wave doesn’t mean anything in particular. It was just that the feature was first discovered while studying somebody’s Foot.

So, again, my layman’s opinion, if the F waves are reduced in persistence it means they are not being properly reflected from the Anterior Horn Cell. This implies something wrong at or above the anterior horn cell. Latency, on the other hand, is a measure of the time traveled along the nerve. Thus, too much latency implies some trouble along the nerve pathway, akin to a traffic jam.

Also, please recall from the previously quoted article, that F waves are not associated with sensory problems.

As always, please seek competent medical advice from a neuromuscular specialist, preferably at one of the GBS-CIDP centers of excellence.