title: The effect of edrophonium chloride-induced chest pain on esophageal blood flow and motility.
abstract: BACKGROUND
  It is not known to what extent patients with non-cardiac chest pain have esophageal ischemia or motor dysfunction. The aim of this study was to investigate whether chest pain provoked by intravenous edrophonium chloride could be due to esophageal ischemia or to muscular spasm.
  
  
  METHODS
  Sixteen patients with a history of non-cardiac chest pain took part. Ten patients (32-69 years old) who did not develop chest pain with intravenous edrophonium chloride were compared with six patients (50-71 years old) who did develop edrophonium-provoked chest pain. Esophageal motility was monitored manometrically. Changes in esophageal blood flow, assessed as the rewarming time after esophageal cooling, was measured with a thermistor technique.
  
  
  RESULTS
  The esophageal rewarming time after cooling was the same before and during the edrophonium test in both groups. The esophageal contraction amplitudes and contraction duration were significantly increased only in patients with edrophonium-provoked chest pain.
  
  
  CONCLUSIONS
  Strong esophageal contractions and not a decreased blood flow in the esophageal wall seem to be the cause of chest pain provoked by intravenous edrophonium chloride.
authors.affiliation: Astra Pain Control AB, Södertälje, Sweden.
authors.forename: U
authors.initials: U
authors.lastname: Gustafsson
authors.forename: L
authors.initials: L
authors.lastname: Tibbling
mesh_terms: D000328:Adult; D000368:Aged; D002637:Chest Pain / Q000139:chemically induced / Q000209:etiology / Q000503:physiopathology*; D002800:Cholinesterase Inhibitors / Q000008:administration & dosage; D004491:Edrophonium / Q000008:administration & dosage; D015154:Esophageal Motility Disorders / Q000503:physiopathology*; D004947:Esophagus / Q000098:blood supply* / Q000503:physiopathology; D005260:Female; D005764:Gastroesophageal Reflux; D006801:Humans; D007511:Ischemia / Q000503:physiopathology*; D008297:Male; D008365:Manometry; D008875:Middle Aged; D009119:Muscle Contraction; D012039:Regional Blood Flow
chemical_list: D002800:Cholinesterase Inhibitors; D004491:Edrophonium