title: [Orthostatic tachycardia syndromes].
abstract: 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.
authors.affiliation: Serviço de Medicina 3, Hospital de Santa Maria, Lisboa.
authors.forename: J L
authors.initials: JL
authors.lastname: Ducla-Soares
mesh_terms: D001342:Autonomic Nervous System Diseases / Q000150:complications; D006801:Humans; D011187:Posture / Q000502:physiology*; D011943:Receptors, Adrenergic, beta / Q000502:physiology; D012769:Shock / Q000150:complications; D013610:Tachycardia / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy
chemical_list: D011943:Receptors, Adrenergic, beta
vernacular_title: Síndromes de taquicardia ortostática.