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Orthostatic tachycardia syndromes.

Orthostatic tachycardia may be due to several physiologic abnormalities. Normal regulation of cardiac frequency in relation to postural changes is described; main causes of orthostatic tachycardia are described, in particular hypovolemia, beta-adrenergic hypersensitivity and segmental autonomic neuropathy. The current therapeutic attitudes are discussed. ; Orthostatic tachycardia may be due to several physiolo...