Editor's Comment: In this review Dr. Natelson proposes that there are three distinct subgroups of CFS, and suggests that each group merits different treatments. Dr. Natelson does not address the eventuality that two or more of the three co-conditions - fibromyalgia, orthostatic intolerance, and psychiatric co-morbidity - may occur simultaneously.
~Source: Frontiers in Integrative Physiology. March 7, 2013
By Benjamin H. Natelson
We have been able to reduce substantially patient pool heterogeneity by identifying phenotypic markers that allow the researcher to stratify chronic fatigue syndrome (CFS) patients into subgroups. To date, we have shown that stratifying based on the presence or absence of co-morbid psychiatric diagnosis leads to a group with evidence of neurological dysfunction across a number of spheres. We have also found that stratifying based on the presence or absence of comorbid fibromyalgia leads to information that would not have been found on analyzing the entire, unstratified patient group. Objective evidence of orthostatic intolerance may be another important variable for stratification and may define a group with episodic cerebral hypoxia leading to symptoms. We hope that this review will encourage other researchers to collect data on discrete phenotypes in CFS to allow this work to continue more broadly. Finding subgroups of CFS suggests different underlying pathophysiological processes responsible for the symptoms seen. Understanding those processes is the first step toward developing discrete treatments for each.
Source: Frontiers in Integrative Physiology. 07 Mar 2013 Benjamin H. Natelson Department of Pain Medicine & Palliative Care, Beth Israel Medical Center, USA
Copyright: © Natelson. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.