title: Angiotensin II receptor blockers in patients with ACE inhibitor-induced angioedema.
abstract: OBJECTIVE
  To determine the safety of using angiotensin II receptor blockers in patients who have experienced angioedema following treatment with angiotensin-converting enzyme (ACE) inhibitors.
  
  
  METHODS
  Clinical literature identified through MEDLINE (January 1966-August 1999). Key search terms included angioneurotic edema, angiotensin-converting enzyme inhibitors, receptors-angiotensin, and losartan.
  
  
  RESULTS
  ACE inhibitor-induced angioedema occurs with an incidence of 0.1-0.5%. Alternative therapy is necessary for patients who experience this potentially life-threatening adverse effect. Since angiotensin II receptor blockers do not increase concentrations of bradykinin, the proposed mechanism of ACE inhibitor-induced angioedema, they were presumed to be safe alternatives. Recent case reports, however, document angioedema following therapy with angiotensin II receptor blockers; 32% of the reported patients experienced a prior episode of angioedema attributed to ACE inhibitor therapy.
  
  
  CONCLUSIONS
  Until the exact cause of both ACE inhibitor- and angiotensin II receptor blocker-induced angioedema is determined, angiotensin II receptor blockers should be used with extreme caution in patients with a prior history of angioedema.
authors.affiliation: The Ohio State University, Columbus, USA.
authors.forename: K K
authors.initials: KK
authors.lastname: Warner
authors.forename: J A
authors.initials: JA
authors.lastname: Visconti
authors.forename: M M
authors.initials: MM
authors.lastname: Tschampel
mesh_terms: D000799:Angioedema / Q000139:chemically induced / Q000188:drug therapy*; D057911:Angiotensin Receptor Antagonists; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000009:adverse effects; D006801:Humans; D019808:Losartan / Q000494:pharmacology / Q000627:therapeutic use*
chemical_list: D057911:Angiotensin Receptor Antagonists; D000806:Angiotensin-Converting Enzyme Inhibitors; D019808:Losartan