title: [Heparin-induced thrombocytopenia type II: reexposure to heparin].
abstract: METHODS
  At the age of 55 years a now 70-year-old man had his aortic valve replaced by a prosthetic (Björk-Shiley) valve, and 11 years later a VDD pacemaker had been implanted. 18 months before the latest admission he had been hospitalized for treatment of staphylococcal endocarditis involving the aortic prothesis. At that time thrombocytopenia developed during heparin administration, diagnosed clinically and with the heparin-induced platelet activity (HIPA) test as type II heparin induced thrombocytopenia. His latest admission was for the diagnosis and treatment of peripheral arterial disease of the right leg (Fontaine stage IIb).
  
  
  METHODS
  Right popliteal and pedal pulses were not palpable. He was able to walk pain-free for only 70 m. Doppler sonography demonstrated an arm-leg index on the right of 0.7. Angiography revealed marked stenosis in the right superficial femoral artery and a filiform stenosis in the right popliteal artery.
  
  
  METHODS
  Both stenoses were relieved by percutaneous transluminal balloon angioplasty, in the course of which 5000 IU heparin were administered as a bolus intraarterially. Postoperative anticoagulation was maintained for 2 days with recombinant hirudin. There was no evidence of platelet reduction or heparin-induced antibodies despite the renewed infusion of heparin.
  
  
  CONCLUSIONS
  Single re-administration of heparin in a patient who had developed a type II heparin-induced thrombocytopenia several years before does not necessarily lead to a booster of antibodies and thus to a reduction of platelets in the peripheral blood. It is a moot point whether the course in this case was an exception or the rule.
authors.affiliation: Klinik für Chirurgie, Universität Magdeburg.
authors.forename: B
authors.initials: B
authors.lastname: Matthies
authors.forename: T
authors.initials: T
authors.lastname: Bürger
authors.forename: B
authors.initials: B
authors.lastname: Koch
authors.forename: M
authors.initials: M
authors.lastname: Böck
mesh_terms: D000368:Aged; D000800:Angioplasty, Balloon; D000917:Antibody Formation; D000925:Anticoagulants / Q000009:adverse effects* / Q000276:immunology / Q000627:therapeutic use; D000991:Antithrombins / Q000627:therapeutic use; D001021:Aortic Valve; D001157:Arterial Occlusive Diseases / Q000628:therapy*; D004697:Endocarditis, Bacterial / Q000188:drug therapy; D005263:Femoral Artery; D006350:Heart Valve Prosthesis; D006493:Heparin / Q000009:adverse effects* / Q000276:immunology / Q000627:therapeutic use; D024764:Hirudin Therapy; D006801:Humans; D007261:Infusions, Intra-Arterial; D008297:Male; D010138:Pacemaker, Artificial; D011150:Popliteal Artery; D011994:Recombinant Proteins / Q000627:therapeutic use; D013203:Staphylococcal Infections / Q000188:drug therapy; D013921:Thrombocytopenia / Q000139:chemically induced*
chemical_list: D000925:Anticoagulants; D000991:Antithrombins; D011994:Recombinant Proteins; D006493:Heparin
vernacular_title: Heparin-induzierte Thrombozytopenie Typ II: Re-Exposition mit Heparin.