Geoffrey Lee

Simultaneous epicardial-endocardial mapping of the sinus node in humans with structural heart disease: Impact of overdrive suppression on sinoatrial exits

Ramanathan Parameswaran, Geoffrey Lee, Gwilym M Morris, Alistair Royse, John Goldblatt, Marco Larobina, Troy Watts, Chrishan J Nalliah, Geoffrey Wong, Ahmed M Al-Kaisey, Robert D Anderson, Aleksandr Voskoboinik, Hariharan Sugumar, David Chieng, Prashanthan Sanders, Peter M Kistler, Jonathan M Kalman

Journal article  |  2020  |  Heart Rhythm

BACKGROUND: The 3-dimensional (3D) nature of sinoatrial node (SAN) function has not been characterized in the intact human heart. ..

Modified Precordial Lead R-Wave Deflection Interval Predicts Left- and Right-Sided Idiopathic Outflow Tract Ventricular Arrhythmias.

Robert D Anderson, Saurabh Kumar, Simon Binny, Mukund Prabhu, Ahmed Al-Kaisey, Ramanathan Parameswaran, Hariharan Sugumar, David Chieng, Joshua Hawson, Timothy Campbell, Subodh Joshi, Elaine Lui, Paul B Sparks, Stephen A Joseph, Joseph B Morton, Alex McLellan, Jonathan Lipton, Bhupesh Pathik, Peter M Kistler, Jonathan Kalman, et al.

Journal article  |  2020  |  JACC Clinical Electrophysiology

OBJECTIVES: This study evaluated if modifying electrocardiographic (ECG) precordial leads to a higher intercostal position improve..

Epicardial Adipose Tissue Accumulation Confers Atrial Conduction Abnormality

Chrishan J Nalliah, James R Bell, Antonia JA Raaijmakers, Helen M Waddell, Simon P Wells, Gabriel B Bernasochi, Magdalene K Montgomery, Simon Binny, Troy Watts, Subodh B Joshi, Elaine Lui, Choon Boon Sim, Marco Larobina, Michael O'Keefe, John Goldblatt, Alistair Royse, Geoffrey Lee, Enzo R Porrello, Matthew J Watt, Peter M Kistler, et al.

Journal article  |  2020  |  Journal of the American College of Cardiology

BACKGROUND: Clinical studies have reported that epicardial adipose tissue (EpAT) accumulation associates with the progression of a..

Scar nonexcitability using simultaneous pacing for substrate ablation of ventricular tachycardia

Robert D Anderson, Geoffrey Lee, Timothy Campbell, Richard G Bennett, Eddy Kizana, Troy Watts, Jonathan Kalman, Saurabh Kumar

Journal article  |  2020  |  Pacing and Clinical Electrophysiology

OBJECTIVES: To describe an expedited strategy of simultaneous high-output pacing during radiofrequency ablation to achieve scar ho..

Endocardial-Epicardial Phase Mapping of Prolonged Persistent Atrial Fibrillation Recordings High Prevalence of Dissociated Activation Patterns

Ramanathan Parameswaran, Jonathan M Kalman, Alistair Royse, John Goldblatt, Marco Larobina, Troy Watts, Tomos E Walters, Chrishan J Nalliah, Geoffrey Wong, Ahmed Al-Kaisey, Robert Douglas Anderson, Aleksandr Voskoboinik, Hariharan Sugumar, David Chieng, Prashanthan Sanders, Peter M Kistler, Edward P Gerstenfeld, Geoffrey Lee

Journal article  |  2020  |  Circulation Arrhythmia and Electrophysiology

BACKGROUND: Endocardial-epicardial dissociation and focal breakthroughs in humans with atrial fibrillation (AF) have been recently..

Multipolar mapping with the high-density grid catheter compared with conventional point-by-point mapping to guide catheter ablation for focal arrhythmias

David Chieng, Anandaroop Lahiri, Hariharan Sugumar, Ahmed Al-Kaisey, Ramanathan Parameswaran, Robert D Anderson, Sandeep Prabhu, Liang-Han Ling, Joseph B Morton, Alex J McLellan, Geoffrey Lee, Jonathan M Kalman, Andrew D McGavigan, Peter M Kistler

Journal article  |  2020  |  Journal of Cardiovascular Electrophysiology

BACKGROUND: Multipolar catheters provide high-density mapping which may reduce the procedural duration and improve the success of ..

Site-Specific Epicardium-to-Endocardium Dissociation of Electrical Activation in a Swine Model of Atrial Fibrillation.

Tomos E Walters, Geoffrey Lee, Adam Lee, Richard Sievers, Jonathan M Kalman, Edward P Gerstenfeld

Journal article  |  2020  |  JACC Clinical Electrophysiology

OBJECTIVES: This study sought to define the extent and spatial distribution of endocardial-epicardial dissociation (EED) in a swin..

Coherent mapping: A step toward physiological mapping of complex arrhythmias?

Ramanathan Parameswaran, Jonathan M Kalman, Geoffrey Lee

Journal article  |  2020  |  Journal of Cardiovascular Electrophysiology

Arrhythmia recurrence is more common in females undergoing multiple catheter ablation procedures for persistent atrial fibrillation: Time to close the gender gap

Hariharan Sugumar, Shane Nanayakkara, David Chieng, Geoffrey R Wong, Ramanathan Parameswaran, Robert D Anderson, Ahmed Al-Kaisey, Chrishan J Nalliah, Sonia Azzopardi, Sandeep Prabhu, Aleksandr Voskoboinik, Geoffrey Lee, Alex J McLellan, Liang-Han Ling, Joseph B Morton, Jonathan M Kalman, Peter M Kistler

Journal article  |  2020  |  Heart Rhythm

BACKGROUND: Female gender is associated with an increased recurrence of atrial fibrillation (AF) after catheter ablation (CA). Alt..

Catheter ablation of ventricular arrhythmia guided by a high-density grid catheter

Timothy Campbell, Ivana Trivic, Richard G Bennett, Robert D Anderson, Samual Turnbull, Timmy Pham, Chrishan Nalliah, Eddy Kizana, Troy Watts, Geoffrey Lee, Saurabh Kumar

Journal article  |  2020  |  Journal of Cardiovascular Electrophysiology

INTRODUCTION: Minimal data exist on the Advisor HD Grid (HDG) catheter and the Precision electroanatomic mapping (EAM) system for ..