This article by Peter Novak gives a handy summary of orthostatic syndromes:
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Autonomic Disorders - PubMed
Autonomic complaints are frequently encountered in clinical practice. They can be due to primary autonomic disorders or secondary to other medical conditions. Primary autonomic disorders can be categorized as orthostatic intolerance syndromes and small fiber neuropathies; the latter are...
pubmed.ncbi.nlm.nih.gov
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