title: Assessment of esophageal motor function using combined multichannel intraluminal impedance and manometry in healthy volunteers: a single-center study in Taiwan.
abstract: BACKGROUND
  Combined multichannel intraluminal impedance and manometry (MII-EM) allow simultaneous measurement of both pressure and bolus transit. The aim of this study was to establish normative data in Chinese subjects for combined MII-EM and to correlate liquid and viscous bolus transit by impedance with esophageal contractions by manometry.
  
  
  METHODS
  Eighteen normal volunteers (six women and 12 men; mean age 24 years, range 19-36 years) underwent combined MII-EM with a catheter containing four impedance-measuring segments and five solid-state pressure transducers. Each subject received 10 liquid and 10 viscous material swallows of 5 mL each. Tracings were analyzed for bolus presence time, total bolus transit time, contraction amplitude, duration, and onset velocity.
  
  
  RESULTS
  A total of 180 liquid and viscous swallow responses were analyzed. In all, 98.4% percent of manometrically normal liquid and 97.7% of manometrically normal viscous swallows had complete bolus transit by impedance. More than half (56.3%) of manometrically ineffective liquid and 50% of ineffective viscous swallows had complete bolus transit. Nearly 90% of normal individuals had at least 70% complete liquid bolus transit while more than 90% of normal individuals had at least 70% complete viscous bolus transit.
  
  
  CONCLUSIONS
  This study establishes normative data for combined MII-EM in a healthy Chinese population. These data will help provide impedance application in esophageal function testing with a reference range that could be utilized by future studies or clinical practices involving Chinese subjects.
authors.affiliation: Division of Gastroenterology and Hepatology, Department of Medicine, Buddhist Tzu Chi General Hospital and University School of Medicine, Hualien, Taiwan. harry.clchen@msa.hinet.net
authors.forename: Chien-Lin
authors.initials: CL
authors.lastname: Chen
authors.forename: Chih-Hsun
authors.initials: CH
authors.lastname: Yi
mesh_terms: D000328:Adult; D017097:Electric Impedance; D004947:Esophagus / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D012016:Reference Values; D013624:Taiwan