title: [Comparison of patients with paroxysmal junctional tachycardia and syncope with those without syncope].
abstract: BACKGROUND
  The purpose of the study was to determine the possible mechanisms of presyncope in patients who have paroxysmal junctional tachycardias (PJT) and a normal surface ECG between tachycardias.
  
  
  METHODS
  Among 419 patients consecutively recruited for PJT, aged from 10 to 88 years (47+/-19), 78 of them had presented at least one syncope; they had a normal ECG in sinus rhythm. Transesophageal programmed atrial stimulation was performed using one and two atrial extrastimuli delivered in control state and if necessary after infusion of 20-30 microg of isoproterenol; arterial blood pressure was monitored; vagal maneuvers and tilt test (n=25) were performed; echocardiogram was systematic.
  
  
  RESULTS
  Age, sex, method of induction, tachycardia mechanism and the mean heart rate in tachycardia were similar in patients with and without syncope. Syncope was related to a vagal reaction induced by the PJT in 31 patients, to a fast rate during PJT in 15 patients, to a sinus node dysfunction in six patients, to a coronary ischemia in five patients, to a tetany induced by PJT in three patients, to an advanced age in three patients, to multiple causes in three patients and remained unexplained in eight patients. Radiofrequency ablation of reentrant circuit, performed in 28 patients, suppressed syncope in 26 of them.
  
  
  CONCLUSIONS
  Presyncope or syncope occurred in 18% of patients who had a history of paroxysmal junctional tachycardia. Several mechanisms were implicated; the most frequent causes were coronary ischemia or sick sinus syndrome in old patients, vasovagal reaction or fast rate in tachycardia or tetany in patients of all ages.
authors.affiliation: Service de cardiologie, CHU de Brabois, rue du Morvan, 54500 Vandoeuvre-les-Nancy, France. b.brembilla-perrot@chu-nancy.fr
authors.forename: B
authors.initials: B
authors.lastname: Brembilla-Perrot
authors.forename: F
authors.initials: F
authors.lastname: Chometon
authors.forename: O
authors.initials: O
authors.lastname: Marçon
authors.forename: F
authors.initials: F
authors.lastname: Duhoux
authors.forename: J
authors.initials: J
authors.lastname: Bertrand
authors.forename: A
authors.initials: A
authors.lastname: Terrier de la Chaise
authors.forename: P
authors.initials: P
authors.lastname: Louis
authors.forename: O
authors.initials: O
authors.lastname: Claudon
authors.forename: O
authors.initials: O
authors.lastname: Selton
authors.forename: H
authors.initials: H
authors.lastname: Belhakem
authors.forename: E
authors.initials: E
authors.lastname: Khaldi
authors.forename: M
authors.initials: M
authors.lastname: Abbas
authors.forename: N
authors.initials: N
authors.lastname: Zhang
authors.forename: D
authors.initials: D
authors.lastname: Beurrier
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D004562:Electrocardiography; D006801:Humans; D008875:Middle Aged; D013575:Syncope / Q000209:etiology*; D013614:Tachycardia, Paroxysmal / Q000150:complications* / Q000503:physiopathology*; D055815:Young Adult