title: Acute pyloric spasm and gastric hypomotility: an extracardiac adverse effect of percutaneous radiofrequency ablation for atrial fibrillation.
abstract: OBJECTIVE
  This study sought to describe a new adverse effect of percutaneous radiofrequency (RF) ablation for atrial fibrillation (AF).
  
  
  BACKGROUND
  Extension of the RF lesion beyond atrial myocardium may affect mediastinal structures other than the esophagus.
  
  
  METHODS
  Circular mapping-guided isolation of the pulmonary veins was performed in two different electrophysiology laboratories, either individually and supplemented by ostial and posterior left atrial (LA) ablation or two by two with a series of ostial and posterior LA lesions. The RF energy was delivered point by point through a 5-mm open-tip irrigated catheter (40 W maximum) or an 8-mm-tip catheter (45 W maximum).
  
  
  RESULTS
  In four (two in each electrophysiology laboratory) of 367 patients undergoing catheter ablation for AF, abdominal pain and distension developed within 48 h after the procedure. Investigation showed acute pyloric spasm and gastric hypomotility, probably the result of LA endocardially delivered RF affecting the periesophageal vagi. Complete spontaneous recovery occurred in two patients, but laparoscopic esophagojejunal anastomosis and endoscopic intra-pyloric Botulinum toxin injection, respectively, were performed to remedy delayed gastric emptying in two patients.
  
  
  CONCLUSIONS
  Thermal injury during endocardial LA RF energy delivery may extend into the mediastinum and rarely may involve the periesophageal nerves, resulting in a syndrome of acute delayed gastric emptying. Marked anatomic variability of periesophageal vagi renders it difficult to reliably avoid the area overlying this plexus, therefore, we advocate a reduction in maximum RF power and application duration on all of the posterior LA to try to avoid this complication.
authors: Service de Cardiologie, Hopital Cantonal Universitaire de Geneve, Geneva, Switzerland. dipen.shah@hcuge.ch
authors: Dipen
authors: D
authors: Shah
authors: Jean-Marc
authors: JM
authors: Dumonceau
authors: Haran
authors: H
authors: Burri
authors: Henri
authors: H
authors: Sunthorn
authors: Andreas
authors: A
authors: Schroft
authors: Pascale
authors: P
authors: Gentil-Baron
authors: Yasuhiro
authors: Y
authors: Yokoyama
authors: Atsushi
authors: A
authors: Takahashi
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000601:surgery*; D017115:Catheter Ablation / Q000009:adverse effects*; D005260:Female; D013271:Gastric Dilatation / Q000209:etiology; D005746:Gastric Emptying; D005769:Gastrointestinal Motility; D006801:Humans; D008297:Male; D008875:Middle Aged; D011707:Pyloric Stenosis / Q000209:etiology*; D013035:Spasm / Q000209:etiology*