title: Leukocytosis and high hematocrit levels during abdominal attacks of hereditary angioedema.
abstract: BACKGROUND
  The diagnosis of hereditary angioedema (HAE) is often delayed due to the low awareness of this condition. In patients with undiagnosed HAE, abdominal symptoms often create the risk of unnecessary surgical operation and/or drug therapy. To explore the cause of misdiagnosis, we compared the laboratory findings of HAE patients under normal conditions with those during abdominal attacks.
  
  
  METHODS
  Patient medical histories were analyzed and laboratory data at the first consultation with no symptoms and no medication were compared with those at visits to the emergency department during severe attacks.
  
  
  RESULTS
  Fourteen HAE patients were enrolled. Initial HAE symptoms occurred at 20.2 ± 9.4 years of age. The correct diagnosis of HAE was made 22.7 ± 14.2 years after the initial symptoms. A common site of angioedema was the extremities. Half of the patients experienced a life-threatening laryngeal attack and/or severe abdominal pain. In the patients with severe abdominal pain, significant leukocytosis with neutrophilia along with increased levels of hematocrit were observed while levels of C-reactive protein (CRP) remained low. All severe attacks were alleviated with an infusion of C1-inhibitor concentrate.
  
  
  CONCLUSIONS
  Consideration of the likelihood of a HAE attack is important when patients present with acute abdominal pain and leukocytosis without elevation of CRP.
authors.affiliation: Division of Nephrology, Department of Internal Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Ohsawa
authors.forename: Seiji
authors.initials: S
authors.lastname: Nagamachi
authors.forename: Hiyori
authors.initials: H
authors.lastname: Suzuki
authors.forename: Daisuke
authors.initials: D
authors.lastname: Honda
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Sato
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ohi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Horikoshi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Tomino
mesh_terms: D015746:Abdominal Pain / Q000209:etiology*; D000293:Adolescent; D000328:Adult; D054179:Angioedemas, Hereditary / Q000097:blood* / Q000150:complications / Q000175:diagnosis*; D002097:C-Reactive Protein / Q000378:metabolism; D002648:Child; D050718:Complement C1 Inhibitor Protein / Q000627:therapeutic use; D051056:Complement Inactivating Agents / Q000627:therapeutic use; D057210:Delayed Diagnosis; D005260:Female; D006400:Hematocrit; D006801:Humans; D007964:Leukocytosis / Q000209:etiology*; D008297:Male; D009504:Neutrophils; D012189:Retrospective Studies; D055815:Young Adult
chemical_list: D050718:Complement C1 Inhibitor Protein; D051056:Complement Inactivating Agents; D002097:C-Reactive Protein
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