title: Acute upper airway angioedema secondary to acquired C1 esterase inhibitor deficiency: a case report.
abstract: OBJECTIVE
  Adverse reactions to local anesthetics are widely reported. We report a case of acute upper airway angioedema presumed to be due to the local anesthetic articaine, which was subsequently diagnosed as acquired C1 esterase inhibitor deficiency.
  
  
  METHODS
  A 54-yr-old woman presented with a history of progressive facial and periorbital edema 24 hr after receiving articaine local anesthetic for a dental procedure. She was in mild respiratory distress but was not stridorous. After inhalational induction with sevoflurane in the operating room, direct laryngoscopy revealed marked edema of supraglottic structures including epiglottis, uvula and aryepiglottic folds and the larynx was not visualized. The patient's trachea was intubated under direct laryngoscopy. Seventy-two hours later, the endotracheal tube was removed and she made an uneventful recovery. Initially, the angioedema was thought to be caused by a hypersensitivity reaction to articaine. Later investigations showed normal C3 complement level, very low C4 complement and C1 esterase inhibitor levels confirming a diagnosis of C1 esterase inhibitor deficiency. Subsequently, the patient was started on androgen therapy. Her C1 esterase inhibitor level normalized and she remained symptom free nine months after initial presentation.
  
  
  CONCLUSIONS
  We report a case of acute upper airway angioedema secondary to C1 esterase inhibitor deficiency requiring emergency airway management. Anesthesiologists should consider C1 esterase inhibitor deficiency in the differential diagnosis of patients with airway edema and be familiar with the acute and prophylactic treatment of patients with this diagnosis.
authors: Department of Anesthesiology, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada. david.wong@uhn.on.ca
authors: David T
authors: DT
authors: Wong
authors: Jeff C
authors: JC
authors: Gadsden
mesh_terms: D000208:Acute Disease; D000402:Airway Obstruction / Q000188:drug therapy / Q000209:etiology*; D000779:Anesthetics, Local / Q000008:administration & dosage / Q000009:adverse effects*; D000799:Angioedema / Q000139:chemically induced / Q000150:complications* / Q000188:drug therapy; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use; D001993:Bronchodilator Agents / Q000627:therapeutic use; D002355:Carticaine / Q000008:administration & dosage / Q000009:adverse effects; D003174:Complement C1 Inactivator Proteins / Q000172:deficiency*; D003613:Danazol / Q000627:therapeutic use*; D003937:Diagnosis, Differential; D004155:Diphenhydramine / Q000627:therapeutic use; D004837:Epinephrine / Q000627:therapeutic use; D004965:Estrogen Antagonists / Q000627:therapeutic use; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal; D008775:Methylprednisolone / Q000627:therapeutic use; D008875:Middle Aged; D012137:Respiratory System / Q000098:blood supply / Q000503:physiopathology*; D055502:Secondary Prevention
chemical_list: D000779:Anesthetics, Local; D000893:Anti-Inflammatory Agents; D001993:Bronchodilator Agents; D003174:Complement C1 Inactivator Proteins; D004965:Estrogen Antagonists; D004155:Diphenhydramine; D002355:Carticaine; D003613:Danazol; D008775:Methylprednisolone; D004837:Epinephrine