Autonomic dysfunction in fibromyalgia syndrome:
This review discusses the presence of additional symptoms besides chronic widespread pain and tenderness in fibromyalgia (FM) syndrome. Disabling fatigue and dizziness are often reported by patients with this chronic illness. Besides nonrestorative sleep, dysfunction of the autonomic nervous system (ANS), need to be considered for chronic fatigue.
Many important biological functions, such as heart rate, blood pressure, respirations, and bowel function, are tightly regulated by the ANS. Other factors associated with ANS are syncope, palpitations and dizziness. Postural orthostatic tachycardia syndrome seen during tilt table testing is defined as a heart rate increase of >30 beats/min after >3 min of standing upright.
Ref: Postural orthostatic tachycardia. Current Rheumatology Reports, Jan 09 Staud R.
LI Comment. There are two parts to the autonomic nervous system. The Parasympathetic System and the Sympathetic Nervous System. In the majority of individuals with fibromyalgia it is the Sympathetic Nervous System that is out of balance.
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