yes. here is one article.

Relapse Patterns May Help Discern Guillain‐Barré from Acute CIDP
Neurology Today 20 May 2010; Volume 10(10); p 10 SAMSON, KURT

here: [url]http://www.aan.com/elibrary/neurologytoday/?event=home.showArticle&id=ovid.com:/bib/ovftdb/00132985-201005200-00009[/url]

A Brief summary-

Note- A-CIDP = acute CIDP

“The team’s initial observations were reported in a brief communication in Neurology in 2005. In that study they compared 11 patients with GBS and 13 with A-CIDP and concluded that A-CIDP should always be suspected when a patient diagnosed with GBS deteriorates after nine weeks, or when a patient experiences three or more treatment fluctuations.”

You really do need to read the whole shebang. enjoy…..