Matthew Wright

Publications (71) View all

• Source

  Available from: Stephen B Wilton

  Dataset: Supplementary Appendices

  Nick W F Linton, Stephen B Wilton, Daniel Scherr, Ashok J Shah, Nicolas Derval, Frederic Sacher, Matthew Wright, Meleze Hocini, Mark D O'Neill, Michel Haïssaguerre, Pierre Jaïs
• Source

  Available from: Stephen B Wilton

  Article: A Practical Criterion for the Rapid Detection of Single-Loop and Double-Loop Reentry Tachycardias.

  Nick W F Linton, Stephen B Wilton, Daniel Scherr, Ashok J Shah, Nicolas Derval, Frederic Sacher, Matthew Wright, Meleze Hocini, Mark D O'Neill, Michel Haïssaguerre, Pierre Jaïs
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  ABSTRACT: INTRODUCTION: Entrainment criteria for the diagnosis of reentrant atrial tachycardia can be difficult to apply and cannot detect double-loop reentry. We sought to develop and clinically test a new criterion for the diagnosis of single- and double-loop reentry. METHODS AND RESULTS: (1) Proposed criterion: after sequential overdrive pacing at 2 different locations and assessing the first ensuing beats of tachycardia, the difference in activation time recorded between 2 appropriate stationary positions changes by 1 or 2 tachycardia cycle lengths; a change of 2 tachycardia cycle lengths usually indicates double-loop reentry rather than only a single-loop. (2) Clinical testing: multiple overdrive pacing maneuvers were undertaken and analyzed in 5 patients with common flutter (single-loop reentry). In total, 23 pairs of overdrive pacing maneuvers were performed using electrodes in the coronary sinus and a distribution of positions in the right atrium. In 22/23 pairs of maneuvers, the change in Activation Difference was within 2.6 ± 12.4 milliseconds of the tachycardia cycle length, confirming single loop reentry. For double-loop reentry, the literature was reviewed and 3 cases of double-loop reentry were identified with sufficient data. In all of these cases, double-loop reentry was detected and also the zone containing the common isthmus was identified. CONCLUSION: The proposed criterion can diagnose single- and double-loop reentry atrial tachycardia using intracardiac recordings from any pair of well separated positions. The criterion does not require precise electrode placement or extensive activation mapping.
  Journal of Cardiovascular Electrophysiology 12/2012; · 3.06 Impact Factor
• Article: Ectopy and Supraventricular Tachycardia: Is There a Relationship?

  Steven E Williams, Pipin Kojodjojo, Nick Linton, Matthew Wright, Mark D O'Neill
  Pacing and Clinical Electrophysiology 12/2012; · 1.35 Impact Factor
• Source

  Available from: Anoop K Shetty

  Article: Cardiac magnetic resonance-derived anatomy, scar, and dyssynchrony fused with fluoroscopy to guide LV lead placement in cardiac resynchronization therapy: a comparison with acute haemodynamic measures and echocardiographic reverse remodelling.

  Anoop K Shetty, Simon G Duckett, Matthew R Ginks, Yinglaing Ma, Manav Sohal, Julian Bostock, Stam Kapetanakis, Jagmeet P Singh, Kawal Rhode, Matthew Wright, Mark D O'Neill, Jaswinder S Gill, Gerald Carr-White, Reza Razavi, Christopher Aldo Rinaldi
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  ABSTRACT: AIMS: Left ventricular (LV) lead positioning for cardiac resynchronization therapy (CRT) is largely empirical and operator-dependent. Our aim was to determine whether cardiac magnetic resonance (CMR)-guided CRT may improve the acute and the chronic response. METHODS AND RESULTS: CMR-derived anatomical models and dyssynchrony maps were created for 20 patients. The CMR targets (three latest activated segments with <50% scar) were overlaid on to live fluoroscopy. Acute haemodynamic response (AHR) to LV pacing was assessed using an intra-ventricular pressure wire. Chronic CRT response (end-systolic volume reduction ≥15%) was assessed 6 months post-implantation. All patients underwent successful CMR-guided LV lead placement. A CMR target segment was paced in 75% of patients. The mean change in LVdP/dt(max) for the CMR target was +14.2 ± 12.5 vs. +18.7 ± 11.9% for the best AHR in any segment and +12.0 ± 13.8% for the segment based on coronary sinus (CS) venography. Using CMR guidance, the acute responder rate was 60 vs. 50% on the basis of venography. At 6 months 60% of patients were echocardiographic responders. Of the echocardiographic responders, 92% were successfully paced in a CMR target segment compared with only 50% of non-responders (P = 0.04). CONCLUSION: CMR guidance compared well when validated against the AHR. Lead placement was possible in the CMR target region in most patients with an AHR comparable with the best achieved in any CS branch. The chronic response was significantly better in patients paced in a CMR target segment. These results suggest that CMR guidance may represent a clinically useful tool for CRT.
  European heart journal cardiovascular Imaging. 11/2012;
• Article: Percutaneous Transhepatic Access for Ablation of Atypical Atrial Flutter in Complex Congenital Heart Disease.

  Sébastien Knecht, Marc Laureys, Jose Castro-Rodriguez, Hugues Dessy, Matthew Wright, Thierry Verbeet
  Journal of Cardiovascular Electrophysiology 10/2012; · 3.06 Impact Factor