The classification of fibromyalgia syndrome.

As has been shown by a number of working groups, primary fibromyalgia syndrome does not represent a single clinical entity. It is possible to distinguish between a subgroup with high pain sensitivity and no associated psychiatric condition, a second and a third subgroup characterized by depression associated with fibromyalgia syndrome, and a fourth group with somatoform pain disorder of the fibromyalgia type. Mild inflammatory processes must be considered as the cause in the first group, while depression is combined with fibromyalgia in the second and the third group.

5-HT3 receptor antagonists regulate autonomic cardiac dysfunction in primary fibromyalgia syndrome.

Fibromyalgia syndrome (FMS) frequently presents with autonomic and/or functional symptoms. Tropisetron, a selective serotonin-3 antagonist, is widely used for the treatment of this disease. However, its effects on autonomic function are not well known.

[Subgroups of fibromyalgia].

As has been shown by a number of working groups, primary fibromyalgia syndrome does not represent a single clinical entity. It is possible to distinguish between a subgroup with high pain sensitivity and no associated psychiatric condition, a second subgroup characterized by depression and concomitant pain symptoms associated with fibromyalgia syndrome, and a third group with somatoform pain disorder of the fibromyalgia type. Bland inflammatory processes must be considered as the cause in the first group, while depression is the underlying reason for the development of pain in the second group.