title: Segmental myocardial velocities in dilated cardiomyopathy with and without left bundle branch block.
abstract: OBJECTIVE
  To quantify three-directional left ventricular (LV) myocardial velocities and intraventricular synchrony in dilated cardiomyopathy (DCM) with and without left bundle branch block (LBBB) using MR tissue phase mapping (TPM).
  
  
  METHODS
  Regional velocities were assessed by TPM (spatial/temporal resolution = 1.3 × 1.3 mm(2) × 8 mm/14 ms) in DCM patients with (n = 12) and without LBBB (n = 7) compared with age-matched volunteers (n = 20). For the evaluation the AHA 16-segment and an extended LV visualization model was used.
  
  
  RESULTS
  Radial velocities in DCM patients were reduced in 75% (systole) and in 94% (diastole) (P = 0.0001 - P = 0.0360), long-axis velocities in 31% (systole) and in 75% (diastole) of the 16 segments compared with controls (P = 0.0001 - P = 0.0310). LBBB resulted in inferolaterally delayed diastolic long-axis velocities (P = 0.0012 - P = 0.0464) and shortened TTP for septal systolic radial velocities (P = 0.0002). Intra-ventricular radial systolic TTP differed up to 150 ms between segments in patients with LBBB (89 ms without LBBB, 34 ms in volunteers) reflecting an increased dyssynchrony. LV twist was altered in all patients with reduced and delayed systolic and diastolic peak velocities.
  
  
  CONCLUSIONS
  TPM identified previously not described alterations of the spatial distribution and timing of all myocardial velocities in patients with DCM and LBBB. This may help to optimize therapy management in future.
authors.affiliation: Department of Cardiology and Angiology, University Hospital, Albert-Ludwigs-University Freiburg, Germany. daniela.foell@uniklinik-freiburg.de
authors.forename: Daniela
authors.initials: D
authors.lastname: Foell
authors.forename: Bernd A
authors.initials: BA
authors.lastname: Jung
authors.forename: Elfriede
authors.initials: E
authors.lastname: Germann
authors.forename: Felix
authors.initials: F
authors.lastname: Staehle
authors.forename: Christoph
authors.initials: C
authors.lastname: Bode
authors.forename: Juergen
authors.initials: J
authors.lastname: Hennig
authors.forename: Michael
authors.initials: M
authors.lastname: Markl
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000473:pathology*; D002311:Cardiomyopathy, Dilated / Q000175:diagnosis* / Q000473:pathology*; D016022:Case-Control Studies; D003952:Diagnostic Imaging / Q000379:methods; D003971:Diastole; D005260:Female; D006339:Heart Rate; D006352:Heart Ventricles / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology; D013599:Systole; D013997:Time Factors