CLINICAL STUDY
Cardiac resynchronization therapy can reverse abnormal myocardial strain distribution in patients with heart failure and left bundle branch block
Ole-A. Breithardt, MD* ,*,
Christoph Stellbrink, MD, FESC*,
Lieven Herbots, MD ,
Piet Claus, PhD ,
Anil M. Sinha, MD*,
Bart Bijnens, PhD ,
Peter Hanrath, MD, FESC, FACC* and
George R. Sutherland, MD, FESC
* Department of Cardiology, University Hospital Aachen, Aachen, Germany
Department of Cardiology, University Hospital Gasthuisberg, Katholic University Leuven, Leuven, Belgium
Manuscript received January 6, 2003;
revised manuscript received April 13, 2003,
accepted April 17, 2003.
* Reprint requests and correspondence: Dr. Ole-A. Breithardt, Medizinische Klinik I, Univ.-Klinikum Aachen, Pauwelsstr. 30, D-52057, Aachen, Germany. olebreithardt{at}gmx.de
OBJECTIVES: We studied the effects of cardiac resynchronization therapy (CRT) on regional myocardial strain distribution, as determined by echocardiographic strain rate (SR) imaging.
BACKGROUND: Dilated hearts with left bundle branch block (LBBB) have an abnormal redistribution of myocardial fiber strain. The effects of CRT on such abnormal strain patterns are unknown.
METHODS: We studied 18 patients (12 males and 6 females; mean age 65 ± 11 years [range 33 to 76 years]) with symptomatic systolic heart failure and LBBB. Doppler myocardial imaging studies were performed to acquire regional longitudinal systolic velocity (cm/s), systolic SR (s1), and systolic strain (%) data from the basal and mid-segments of the septum and lateral wall before and after CRT. By convention, negative SR and strain values indicate longitudinal shortening.
RESULTS: Before CRT, mid-septal peak SR and peak strain were lower than in the mid-lateral wall (peak SR: 0.79 ± 0.5 [septum] vs. 1.35 ± 0.8 [lateral wall], p < 0.05; peak strain: 7 ± 5 [septum] vs. 11 ± 5 [lateral wall], p < 0.05). This relationship was reversed during CRT (peak SR: 1.35 ± 0.8 [septum] vs. 0.93 ± 0.6 [lateral wall], p < 0.05; peak strain: 11 ± 6 [septum] vs. 7 ± 6 [lateral wall], p < 0.05). Cardiac resynchronization therapy reversed the septallateral difference in mid-segmental peak strain from 46 ± 94 ms (LBBB) to 17 ± 92 ms (CRT; p < 0.05).
CONCLUSIONS: Left bundle branch block can lead to a significant redistribution of abnormal myocardial fiber strains. These abnormal changes in the extent and timing of septallateral strain relationships can be reversed by CRT. The noninvasive identification of specific abnormal but reversible strain patterns should help to improve patient selection for CRT.
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Abbreviations and Acronyms
| | CDMI | | color Doppler myocardial imaging | | CRT | | cardiac resynchronization therapy |  | | strain | | ICM | | ischemic cardiomyopathy | | IVCT | | isovolumic contraction time | | IVRT | | isovolumic relaxation time | | LBBB | | left bundle branch block | | LV | | left ventricle/ventricular | | NICM | | nonischemic dilated cardiomyopathy | | RV | | right ventricle/ventricular | | SR | | strain rate | | SRI | | strain rate imaging | | Vmax | | peak positive velocity |
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117(20):
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117(15):
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|
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April 1, 2008;
10(4):
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|
 |
|

|
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|
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Practical and conceptual limitations of tissue Doppler imaging to predict reverse remodelling in cardiac resynchronisation therapy
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March 1, 2008;
10(3):
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|
 |
|

|
 |

|
 |
 
N R Van de Veire, C-M Yu, N Ajmone-Marsan, G B Bleeker, C Ypenburg, J De Sutter, Q Zhang, J W H Fung, J Y S Chan, E R Holman, et al.
Triplane tissue Doppler imaging: a novel three-dimensional imaging modality that predicts reverse left ventricular remodelling after cardiac resynchronisation therapy
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March 1, 2008;
94(3):
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|
 |
|

|
 |

|
 |
 
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Cardiac resynchronization therapy: clinical results and evolution of candidate selection
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December 1, 2007;
9(suppl_I):
I94 - I106.
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[Full Text]
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|
 |
|

|
 |

|
 |
 
G. B Bleeker, C.-M. Yu, P. Nihoyannopoulos, J. de Sutter, N. Van de Veire, E. R Holman, M. J Schalij, E. E van der Wall, and J. J Bax
Optimal use of echocardiography in cardiac resynchronisation therapy
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|
 |
|

|
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|
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October 1, 2007;
8(5):
309 - 316.
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|
 |
|

|
 |

|
 |
 
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October 1, 2007;
93(10):
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|
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|

|
 |

|
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October 1, 2007;
9(10):
959 - 998.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
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Impact of left ventricular lead position on the efficacy of cardiac resynchronisation therapy: a two-dimensional strain echocardiography study
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October 1, 2007;
93(10):
1197 - 1203.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
G. B. Bleeker, S. A. Mollema, E. R. Holman, N. Van De Veire, C. Ypenburg, E. Boersma, E. E. van der Wall, M. J. Schalij, and J. J. Bax
Left Ventricular Resynchronization Is Mandatory for Response to Cardiac Resynchronization Therapy: Analysis in Patients With Echocardiographic Evidence of Left Ventricular Dyssynchrony at Baseline
Circulation,
September 25, 2007;
116(13):
1440 - 1448.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
Authors/Task Force Members, P. E. Vardas, A. Auricchio, J.-J. Blanc, J.-C. Daubert, H. Drexler, H. Ector, M. Gasparini, C. Linde, F. B. Morgado, et al.
Guidelines for cardiac pacing and cardiac resynchronization therapy: The Task Force for Cardiac Pacing and Cardiac Resynchronization Therapy of the European Society of Cardiology. Developed in Collaboration with the European Heart Rhythm Association
Eur. Heart J.,
September 2, 2007;
28(18):
2256 - 2295.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. C. Wu, F. M. Bengel, and S. S. Gambhir
Cardiovascular Molecular Imaging
Radiology,
August 1, 2007;
244(2):
337 - 355.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
F. Weidemann, P. Jung, C. Hoyer, J. Broscheit, W. Voelker, G. Ertl, S. Stork, C. E. Angermann, and J. M. Strotmann
Assessment of the contractile reserve in patients with intermediate coronary lesions: a strain rate imaging study validated by invasive myocardial fractional flow reserve
Eur. Heart J.,
June 2, 2007;
28(12):
1425 - 1432.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
M. Di Donato, M. Sabatier, L. Menicanti, and V. Dor
Incidence of ventricular arrhythmias after left ventricular reconstructive surgery
J. Thorac. Cardiovasc. Surg.,
February 1, 2007;
133(2):
289 - 291.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
L. P. Badano, O. Gaddi, C. Peraldo, G. Lupi, M. Sitges, F. Parthenakis, S. Molteni, M. R. Pagliuca, B. Sassone, P. Di Stefano, et al.
Left ventricular electromechanical delay in patients with heart failure and normal QRS duration and in patients with right and left bundle branch block
Europace,
January 1, 2007;
9(1):
41 - 47.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
F. Zannad, E. Huvelle, K. Dickstein, D. J. van Veldhuisen, C. Stellbrink, L. Kober, S. Cazeau, P. Ritter, A. P. Maggioni, R. Ferrari, et al.
Left bundle branch block as a risk factor for progression to heart failure
Eur J Heart Fail,
January 1, 2007;
9(1):
7 - 14.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
E Agricola, M Oppizzi, M Galderisi, M Pisani, A Meris, C Pappone, and A Margonato
Role of regional mechanical dyssynchrony as a determinant of functional mitral regurgitation in patients with left ventricular systolic dysfunction
Heart,
October 1, 2006;
92(10):
1390 - 1395.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
M. C. Porciani, A. Lilli, R. Macioce, F. Cappelli, G. Demarchi, A. Pappone, G. Ricciardi, and L. Padeletti
Utility of a new left ventricular asynchrony index as a predictor of reverse remodelling after cardiac resynchronization therapy
Eur. Heart J.,
August 1, 2006;
27(15):
1818 - 1823.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
H. Mannaerts
Regression of left ventricular mass and wall thickness after cardiac resynchronization therapy: proof of pathophysiological concept
Eur. Heart J.,
June 2, 2006;
27(12):
1392 - 1393.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
N. M. Hawkins, M. C. Petrie, M. R. MacDonald, K. J. Hogg, and J. J.V. McMurray
Selecting patients for cardiac resynchronization therapy: electrical or mechanical dyssynchrony?
Eur. Heart J.,
June 1, 2006;
27(11):
1270 - 1281.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
D. Mele, G. Pasanisi, F. Capasso, A. De Simone, M.-A. Morales, D. Poggio, A. Capucci, G. Tabacchi, L. Sallusti, and R. Ferrari
Left intraventricular myocardial deformation dyssynchrony identifies responders to cardiac resynchronization therapy in patients with heart failure
Eur. Heart J.,
May 1, 2006;
27(9):
1070 - 1078.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
X. A. A. M. Verbeek, A. Auricchio, Y. Yu, J. Ding, T. Pochet, K. Vernooy, A. Kramer, J. Spinelli, and F. W. Prinzen
Tailoring cardiac resynchronization therapy using interventricular asynchrony. Validation of a simple model
Am J Physiol Heart Circ Physiol,
March 1, 2006;
290(3):
H968 - H977.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
O.-A. Breithardt and G. Breithardt
Quest for the Best Candidate: How Much Imaging Do We Need Before Prescribing Cardiac Resynchronization Therapy?
Circulation,
February 21, 2006;
113(7):
926 - 928.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
U. Sartipy, A. Albage, E. Straat, P. Insulander, and D. Lindblom
Surgery for Ventricular Tachycardia in Patients Undergoing Left Ventricular Reconstruction by the Dor Procedure
Ann. Thorac. Surg.,
January 1, 2006;
81(1):
65 - 71.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J. Bax, T. Abraham, S. S. Barold, O. A. Breithardt, J. W.H. Fung, S. Garrigue, J. Gorcsan III, D. L. Hayes, D. A. Kass, J. Knuuti, et al.
Cardiac Resynchronization Therapy: Part 1--Issues Before Device Implantation
J. Am. Coll. Cardiol.,
December 20, 2005;
46(12):
2153 - 2167.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J.M. Zwanenburg, M. J.W. Gotte, J. T. Marcus, J. P.A. Kuijer, P. Knaapen, R. M. Heethaar, and A. C. van Rossum
Propagation of Onset and PeakTime of Myocardial Shortening in Time of Myocardial Shortening in Ischemic Versus Nonischemic Cardiomyopathy: Assessment by Magnetic Resonance Imaging Myocardial Tagging
J. Am. Coll. Cardiol.,
December 20, 2005;
46(12):
2215 - 2222.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
P. Schuster, K. Matre, and S. Faerestrand
Assessment of regional timing of left ventricular systolic longitudinal movement by Doppler tissue synchronization imaging in structurally normal hearts
Eur J Echocardiogr,
October 1, 2005;
6(5):
336 - 343.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
S. Kapetanakis, M.T. Kearney, A. Siva, N. Gall, M. Cooklin, and M.J. Monaghan
Real-Time Three-Dimensional Echocardiography: A Novel Technique to Quantify Global Left Ventricular Mechanical Dyssynchrony
Circulation,
August 16, 2005;
112(7):
992 - 1000.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J. M. Zwanenburg, M. J. W. Gotte, J. P. A. Kuijer, M. B. M. Hofman, P. Knaapen, R. M. Heethaar, A. C. van Rossum, and J. T. Marcus
Regional timing of myocardial shortening is related to prestretch from atrial contraction: assessment by high temporal resolution MRI tagging in humans
Am J Physiol Heart Circ Physiol,
February 1, 2005;
288(2):
H787 - H794.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
P Schuster, S Faerestrand, and O J Ohm
Reverse remodelling of systolic left ventricular contraction pattern by long term cardiac resynchronisation therapy: colour Doppler shows resynchronisation
Heart,
December 1, 2004;
90(12):
1411 - 1416.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
H J Nesser, O-A Breithardt, and B K Khandheria
Established and evolving indications for cardiac resynchronisation
Heart,
December 1, 2004;
90(suppl_6):
vi5 - vi9.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J. Bax, G. B. Bleeker, T. H. Marwick, S. G. Molhoek, E. Boersma, P. Steendijk, E. E. van der Wall, and M. J. Schalij
Left ventricular dyssynchrony predicts response and prognosis after cardiac resynchronization therapy
J. Am. Coll. Cardiol.,
November 2, 2004;
44(9):
1834 - 1840.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
L. Faber, B. Lamp, J. Vogt, and D. Horstkotte
Tissue Doppler imaging in patients with congestive heart failure and conduction disorders
Eur. Heart J. Suppl.,
August 1, 2004;
6(suppl_D):
D10 - D15.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
O. A. Breithardt, L. Herbots, J. D'Hooge, P. Claus, B. Bijnens, C. Stellbrink, A. Franke, and G. R. Sutherland
Strain rate imaging in CRT candidates
Eur. Heart J. Suppl.,
August 1, 2004;
6(suppl_D):
D16 - D24.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
C. Stellbrink, O.-A. Breithardt, A.-M. Sinha, and P. Hanrath
How to discriminate responders from non-responders to cardiac resynchronisation therapy
Eur. Heart J. Suppl.,
August 1, 2004;
6(suppl_D):
D101 - D105.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J. Bax, G. Ansalone, O. A. Breithardt, G. Derumeaux, C. Leclercq, M. J. Schalij, P. Sogaard, M. St. John Sutton, and P. Nihoyannopoulos
Echocardiographic evaluation of cardiac resynchronization therapy: ready for routine clinical use?: A critical appraisal
J. Am. Coll. Cardiol.,
July 7, 2004;
44(1):
1 - 9.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
J. J. M. Zwanenburg, M. J. W. Gotte, J. P. A. Kuijer, R. M. Heethaar, A. C. van Rossum, and J. T. Marcus
Timing of cardiac contraction in humans mapped by high-temporal-resolution MRI tagging: early onset and late peak of shortening in lateral wall
Am J Physiol Heart Circ Physiol,
May 1, 2004;
286(5):
H1872 - H1880.
[Abstract]
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
O. A Breithardt, P. Claus, and G. R Sutherland
Do we understand who benefits from resynchronisation therapy?
Eur. Heart J.,
April 1, 2004;
25(7):
535 - 536.
[Full Text]
[PDF]
|
 |
|

|
 |

|
 |
 
B. Nowak, C. Stellbrink, W. M. Schaefer, A. M. Sinha, O. A. Breithardt, H.-J. Kaiser, P. Reinartz, P. Hanrath, and U. Buell
Comparison of Regional Myocardial Blood Flow and Perfusion in Dilated Cardiomyopathy and Left Bundle Branch Block: Role of Wall Thickening
J. Nucl. Med.,
March 1, 2004;
45(3):
414 - 418.
[Abstract]
[Full Text]
|
 |
|

|
 |

|
 |
 
A. E. Weyman
The year in echocardiography
J. Am. Coll. Cardiol.,
January 7, 2004;
43(1):
140 - 148.
[Full Text]
[PDF]
|
 |
|
|