title: Results of the Prospective Minnesota Study of ECHO/TDI in Cardiac Resynchronization Therapy (PROMISE-CRT) study.
abstract: BACKGROUND
  Retrospective single-center studies have shown that measures of mechanical dyssynchrony before cardiac resynchronization therapy (CRT), or acute changes after CRT, predict response better than QRS duration. The Prospective Minnesota Study of Echocardiographic/TDI in Cardiac Resynchronization Therapy (PROMISE-CRT) study was a prospective multicenter study designed to determine whether acute (1 week) changes in mechanical dyssynchrony were associated with response to CRT.
  
  
  RESULTS
  Nine Minnesota Heart Failure Consortium centers enrolled 71 patients with standard indications for CRT. Left ventricular (LV) size, function, and mechanical dyssynchrony (echocardiography [ECHO], tissue Doppler imaging [TDI], speckle-tracking echocardiography [STE]) as well as 6-minute walk distance and Minnesota Living with Heart Failure Questionnaire scores were measured at baseline and 3 and 6 months after CRT. Acute change in mechanical dyssynchrony was not associated with clinical response to CRT. Acute change in STE radial dyssynchrony explained 73% of the individual variation in reverse remodeling. Baseline measures of mechanical dyssynchrony were associated with reverse remodeling (but not clinical) response, with 4 measures each explaining 12% to 30% of individual variation.
  
  
  CONCLUSIONS
  Acute changes in radial mechanical dyssynchrony, as measured by STE, and other baseline mechanical dyssynchrony measures were associated with CRT reverse remodeling. These data support the hypothesis that acute improvement in LV mechanical dyssynchrony is an important mechanism contributing to LV reverse remodeling with CRT.
authors.affiliation: Minnesota Heart Failure Consortium, Minneapolis, Minnesota, USA. abank@stphc.com
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Bank
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Kaufman
authors.forename: Aaron S
authors.initials: AS
authors.lastname: Kelly
authors.forename: Kevin V
authors.initials: KV
authors.lastname: Burns
authors.forename: Stuart W
authors.initials: SW
authors.lastname: Adler
authors.forename: Tom S
authors.initials: TS
authors.lastname: Rector
authors.forename: Steven R
authors.initials: SR
authors.lastname: Goldsmith
authors.forename: Maria-Teresa P
authors.initials: MT
authors.lastname: Olivari
authors.forename: Chuen
authors.initials: C
authors.lastname: Tang
authors.forename: Linda
authors.initials: L
authors.lastname: Nelson
authors.forename: Andrea
authors.initials: A
authors.lastname: Metzig
mesh_terms: D000368:Aged; D018618:Echocardiography, Doppler, Color / Q000379:methods*; D004554:Electric Countershock / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006333:Heart Failure / Q000503:physiopathology / Q000628:therapy*; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008910:Minnesota; D011446:Prospective Studies; D013997:Time Factors; D016896:Treatment Outcome; D016277:Ventricular Function, Left / Q000502:physiology*; D020257:Ventricular Remodeling / Q000502:physiology*