title: Ventricular dyssynchrony: 12-month evaluation in ischemic versus nonischemic CRT patients.
abstract: OBJECTIVE
  Few data exist about the potential differences in the dyssynchrony status of cardiac resynchronization therapy (CRT) candidates stratified by etiology of heart failure, and about the evolution of dyssynchrony at long-term follow-up. We provided a description of intra-ventricular dyssynchrony at baseline, 6 months and 12 months in ischemic and nonischemic CRT patients.
  
  
  METHODS
  Tissue Doppler Imaging was performed in 35 CRT candidates (18 ischemic, 17 nonischemic) at baseline, and at 6-month and 12-month follow-up. A group of 11 healthy subjects was considered for comparison.
  
  
  RESULTS
  At baseline, the standard deviation and the maximum activation delay between any 2 segments were significantly greater in ischemic (38+/-33ms, 94+/-76ms) and nonischemic (38+/-24ms, 96+/-62ms) patients versus controls (9+/-7ms, 22+/-15ms) (all p<0.05). The average time to activation for posterior and lateral wall was significantly higher in nonischemic patients, while the anterior septum activated later in ischemic patients. At 6-month follow-up, standard deviation and maximum delay did not vary in nonischemic while decreased in ischemic group. All changes persisted at 12 months.
  
  
  CONCLUSIONS
  No baseline differences were observed between ischemic and nonischemic patients using studied indices. At 6- and 12-month follow-up, only ischemic patients presented a significant reduction in dyssynchrony values, although in both groups CRT did not lead to a complete normalization of LV synchronism.
authors.affiliation: Ospedale Fatebenefratelli - S. Giovanni Calibita, Rome, Italy. c.p.neja@iscali.it
authors.forename: Carlo
authors.initials: C
authors.lastname: Peraldo
authors.forename: Paolo
authors.initials: P
authors.lastname: Azzolini
authors.forename: Sabrina
authors.initials: S
authors.lastname: Matera
authors.forename: Donatella
authors.initials: D
authors.lastname: Nistri
authors.forename: Stefano
authors.initials: S
authors.lastname: Bianchi
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Sgreccia
authors.forename: Sergio
authors.initials: S
authors.lastname: Valsecchi
authors.forename: Mario
authors.initials: M
authors.lastname: Davinelli
authors.forename: Andrea
authors.initials: A
authors.lastname: Puglisi