PURPOSE: 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). MATERIALS AND 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. CONCLUSION: 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.
PURPOSE: 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). MATERIALS AND METHODS: Regional velocities were assessed by TPM (spatial/temporal resolution = 1.3 × 1.3 mm(2) × 8 mm/14 ms) in DCMpatients 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 DCMpatients 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. CONCLUSION: 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: Haben Berhane; Alexander Ruh; Nazia Husain; Joshua D Robinson; Cynthia K Rigsby; Michael Markl Journal: J Magn Reson Imaging Date: 2019-09-12 Impact factor: 4.813
Authors: Jeremy Collins; Cort Sommerville; Patrick Magrath; Bruce Spottiswoode; Benjamin H Freed; Keith H Benzuly; Robert Gordon; Himabindu Vidula; Dan C Lee; Clyde Yancy; James Carr; Michael Markl Journal: Circ Cardiovasc Imaging Date: 2014-12-31 Impact factor: 7.792
Authors: Charlotte Gimpel; Bernd A Jung; Sabine Jung; Johannes Brado; Daniel Schwendinger; Barbara Burkhardt; Martin Pohl; Katja E Odening; Julia Geiger; Raoul Arnold Journal: Pediatr Radiol Date: 2016-12-13
Authors: Kai Lin; Varun Chowdhary; Keith H Benzuly; Clyde W Yancy; Jon W Lomasney; Vera H Rigolin; Allen S Anderson; Jane Wilcox; James Carr; Michael Markl Journal: Int J Cardiovasc Imaging Date: 2016-04-26 Impact factor: 2.357
Authors: Kai Lin; Jeremy D Collins; Varun Chowdhary; Michael Markl; James C Carr Journal: Int J Cardiovasc Imaging Date: 2016-04-13 Impact factor: 2.357