title: Heterogeneity of lower esophageal sphincter function in children with achalasia.
abstract: OBJECTIVE
  Achalasia is a rare esophageal motor disorder in children. The manometric hallmarks are esophageal body aperistalsis, lack of lower esophageal sphincter (LES) relaxation, and high LES pressure. However, LES relaxation and function may be heterogeneous, making the diagnosis difficult at times. The aim of the study was to describe LES function in children with achalasia.
  
  
  METHODS
  The present study is a retrospective review of manometric tracings of pediatric patients with achalasia and controls. LES response after each swallow was evaluated. LES parameters were defined as homogeneous (normal or abnormal) if the same response was observed in >75% of swallows. Otherwise, the LES parameters were considered heterogeneous.
  
  
  RESULTS
  Twenty-nine patients with achalasia and 16 control patients were included. All of the controls had normal LES pressure and relaxation in all of the wet swallows. In the achalasia group, some LES relaxation was present in 74% of swallows and 25% of swallows had normal relaxation. Depending on the parameter, a heterogeneous LES (resting pressure, relaxation, residual pressure, and duration of relaxation) was observed in 27.6% to 34.5% of patients with achalasia versus 0% of the controls (P < 0.001). The rest of the patients with achalasia had homogeneous abnormal responses versus homogeneous normal responses in 100% of control patients (P < 0.001).
  
  
  CONCLUSIONS
  The LES function in pediatric patients with achalasia is heterogeneous. The classic description of a nonrelaxing high-pressure LES in patients with achalasia is rarely found in children. Partial relaxations are common, and normal relaxations may be present.
authors.affiliation: Center for Motility and Functional Gastrointestinal Disorders, Children's Hospital Boston, Boston, MA 02115, USA.
authors.forename: Claudio
authors.initials: C
authors.lastname: Morera
authors.forename: Samuel
authors.initials: S
authors.lastname: Nurko
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002648:Child; D003679:Deglutition / Q000502:physiology*; D004931:Esophageal Achalasia / Q000503:physiopathology*; D049630:Esophageal Sphincter, Lower / Q000502:physiology / Q000503:physiopathology*; D006801:Humans; D008365:Manometry / Q000379:methods; D009126:Muscle Relaxation / Q000502:physiology*; D011312:Pressure; D012189:Retrospective Studies