title: Blockade of vasospastic attacks by alpha 2-adrenergic but not alpha 1-adrenergic antagonists in idiopathic Raynaud's disease.
abstract: BACKGROUND
  Idiopathic Raynaud's disease is characterized by cold-induced digital vasospasms, but its origin has not been established. Previous research has shown that peripheral vascular alpha 2-adrenergic receptors are hypersensitive to local cooling in these patients, but the role of alpha 1-adrenergic receptors is not clear. Moreover, the role of adrenergic receptors in the production of actual vasospastic symptoms has not been investigated.
  
  
  RESULTS
  We studied 23 patients with idiopathic Raynaud's disease who were screened using conservative criteria. They were randomly assigned to receive brachial artery infusions of an alpha 1-antagonist, an alpha 2-antagonist, or both while vasospastic attacks were induced by cooling in the laboratory. Each patient's hands were photographed, and the number of attacks in the infused hand was compared with the number in the contralateral hand. The number of fingers (mean +/- SEM) with attacks in infused hands was yohimbine 0.3 +/- 0.3, prazosin 2.3 +/- 0.3, and both drugs 0.6 +/- 0.2. The difference between prazosin and the other two drug groups was significant (P < .001).
  
  
  CONCLUSIONS
  These findings demonstrate that activation of alpha 2-adrenergic receptors but not alpha 1-adrenergic receptors is necessary for the production of vasospastic attacks in idiopathic Raynaud's disease.
authors.affiliation: Department of Psychiatry (Cellular and Clinical Neurobiology), Wayne State University School of Medicine, Detroit, Mich., USA.
authors.forename: R R
authors.initials: RR
authors.lastname: Freedman
authors.forename: R P
authors.initials: RP
authors.lastname: Baer
authors.forename: M D
authors.initials: MD
authors.lastname: Mayes
mesh_terms: D058668:Adrenergic alpha-1 Receptor Antagonists; D058669:Adrenergic alpha-2 Receptor Antagonists; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011224:Prazosin / Q000494:pharmacology; D011928:Raynaud Disease / Q000503:physiopathology*; D018340:Receptors, Adrenergic, alpha-1 / Q000502:physiology*; D018341:Receptors, Adrenergic, alpha-2 / Q000502:physiology*; D014661:Vasoconstriction; D015016:Yohimbine / Q000494:pharmacology
chemical_list: D058668:Adrenergic alpha-1 Receptor Antagonists; D058669:Adrenergic alpha-2 Receptor Antagonists; D018340:Receptors, Adrenergic, alpha-1; D018341:Receptors, Adrenergic, alpha-2; D015016:Yohimbine; D011224:Prazosin