Ronald D Berger

Summary

Affiliation: Johns Hopkins University
Country: USA

Publications

  1. ncbi request reprint Beat-to-beat QT interval variability: novel evidence for repolarization lability in ischemic and nonischemic dilated cardiomyopathy
    R D Berger
    Johns Hopkins School of Medicine, Baltimore, MD 21287, USA
    Circulation 96:1557-65. 1997
  2. doi request reprint Incidence and predictors of left atrial thrombus prior to catheter ablation of atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
    J Cardiovasc Electrophysiol 20:379-84. 2009
  3. doi request reprint Predictors of high defibrillation threshold in the modern era
    Edward F Lin
    Johns Hopkins University, Baltimore, Maryland, USA
    Pacing Clin Electrophysiol 36:231-7. 2013
  4. pmc Cardiac magnetic resonance assessment of dyssynchrony and myocardial scar predicts function class improvement following cardiac resynchronization therapy
    Kenneth C Bilchick
    Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
    JACC Cardiovasc Imaging 1:561-8. 2008
  5. doi request reprint Incidence and predictors of periprocedural cerebrovascular accident in patients undergoing catheter ablation of atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 20:1357-63. 2009
  6. doi request reprint Long- and short-term temporal stability of complex fractionated atrial electrograms in human left atrium during atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 20:13-21. 2009
  7. ncbi request reprint The benefit of upgrading chronically right ventricle-paced heart failure patients to resynchronization therapy demonstrated by strain rate imaging
    Zayd A Eldadah
    Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
    Heart Rhythm 3:435-42. 2006
  8. pmc Myocardial structural associations with local electrograms: a study of postinfarct ventricular tachycardia pathophysiology and magnetic resonance-based noninvasive mapping
    Takeshi Sasaki
    Department of Medicine Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
    Circ Arrhythm Electrophysiol 5:1081-90. 2012
  9. doi request reprint Effects of surgical and endoscopic electrocautery on modern-day permanent pacemaker and implantable cardioverter-defibrillator systems
    Alan Cheng
    Section for Cardiac Electrophysiology, Division of Cardiovascular Diseases, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Pacing Clin Electrophysiol 31:344-50. 2008
  10. ncbi request reprint Automated detection and characterization of complex fractionated atrial electrograms in human left atrium during atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Heart Rhythm 4:1013-20. 2007

Detail Information

Publications78

  1. ncbi request reprint Beat-to-beat QT interval variability: novel evidence for repolarization lability in ischemic and nonischemic dilated cardiomyopathy
    R D Berger
    Johns Hopkins School of Medicine, Baltimore, MD 21287, USA
    Circulation 96:1557-65. 1997
    ..We sought to test the hypothesis that beat-to-beat QT interval variability is increased in DCM patients compared with control subjects...
  2. doi request reprint Incidence and predictors of left atrial thrombus prior to catheter ablation of atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
    J Cardiovasc Electrophysiol 20:379-84. 2009
    ..However, the incidence and predictors of LA thrombus detected with TEE have not been systematically examined in this setting...
  3. doi request reprint Predictors of high defibrillation threshold in the modern era
    Edward F Lin
    Johns Hopkins University, Baltimore, Maryland, USA
    Pacing Clin Electrophysiol 36:231-7. 2013
    ..Identification of the predictors of elevated DFT may allow selective application of DFT testing. However, the clinical characteristics of patients with high DFT in the modern era have not been well-defined...
  4. pmc Cardiac magnetic resonance assessment of dyssynchrony and myocardial scar predicts function class improvement following cardiac resynchronization therapy
    Kenneth C Bilchick
    Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
    JACC Cardiovasc Imaging 1:561-8. 2008
    ....
  5. doi request reprint Incidence and predictors of periprocedural cerebrovascular accident in patients undergoing catheter ablation of atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 20:1357-63. 2009
    ..Cerebrovascular accident (CVA) is a serious complication of catheter ablation of atrial fibrillation (AF). The incidence and clinical predictors of periprocedural CVA in patients undergoing AF ablation are not fully understood...
  6. doi request reprint Long- and short-term temporal stability of complex fractionated atrial electrograms in human left atrium during atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 20:13-21. 2009
    ..Complex fractionated atrial electrograms (CFAEs) have been reported as targets for catheter ablation of atrial fibrillation (AF). However, the temporal stability of CFAE sites remains poorly defined...
  7. ncbi request reprint The benefit of upgrading chronically right ventricle-paced heart failure patients to resynchronization therapy demonstrated by strain rate imaging
    Zayd A Eldadah
    Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
    Heart Rhythm 3:435-42. 2006
    ..RV pacing induces conduction delay (CD), mechanical dyssynchrony, and increased morbidity in patients with HF. CRT improves HF symptoms and survival, but sparse data exist on its direct effect on chronically RV-paced HF patients...
  8. pmc Myocardial structural associations with local electrograms: a study of postinfarct ventricular tachycardia pathophysiology and magnetic resonance-based noninvasive mapping
    Takeshi Sasaki
    Department of Medicine Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
    Circ Arrhythm Electrophysiol 5:1081-90. 2012
    ..We aimed to quantify these associations to gain insights regarding LGE-CMR image characteristics of tissues and critical sites that support postinfarct ventricular tachycardia (VT)...
  9. doi request reprint Effects of surgical and endoscopic electrocautery on modern-day permanent pacemaker and implantable cardioverter-defibrillator systems
    Alan Cheng
    Section for Cardiac Electrophysiology, Division of Cardiovascular Diseases, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Pacing Clin Electrophysiol 31:344-50. 2008
    ..The ability of newer devices to withstand system malfunction or failure during surgery/endoscopy remains unknown...
  10. ncbi request reprint Automated detection and characterization of complex fractionated atrial electrograms in human left atrium during atrial fibrillation
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Heart Rhythm 4:1013-20. 2007
    ..Complex fractionated atrial electrograms (CFAEs) have been reported as ablative targets for the treatment of atrial fibrillation (AF). However, the process of CFAE identification is highly dependent on the operator's judgment...
  11. ncbi request reprint Impact of heart rhythm status on registration accuracy of the left atrium for catheter ablation of atrial fibrillation
    Jun Dong
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 18:1269-76. 2007
    ..However, the impact of the heart rhythm change on the accuracy of left atrium (LA) registration has not been studied...
  12. pmc Clinical utility and safety of a protocol for noncardiac and cardiac magnetic resonance imaging of patients with permanent pacemakers and implantable-cardioverter defibrillators at 1.5 tesla
    Saman Nazarian
    Department of Cardiology, Johns Hopkins Hospital, Carnegie 568, 600 N Wolfe St, Baltimore, MD 21287, USA
    Circulation 114:1277-84. 2006
    ..We sought to evaluate the diagnostic utility and safety of noncardiac and cardiac MRI at 1.5T using a protocol that incorporates device selection and programming and limits the estimated specific absorption rate of MRI sequences...
  13. ncbi request reprint Novel electrode design for potentially painless internal defibrillation also allows for successful external defibrillation
    Venku Jayanti
    Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287 0409, USA
    J Cardiovasc Electrophysiol 18:1095-100. 2007
    ....
  14. doi request reprint Dual antiplatelet therapy and heparin "bridging" significantly increase the risk of bleeding complications after pacemaker or implantable cardioverter-defibrillator device implantation
    Christine Tompkins
    Johns Hopkins Hospital, Baltimore, Maryland, USA
    J Am Coll Cardiol 55:2376-82. 2010
    ..This study was designed to assess the risk of significant bleeding complications in patients receiving antiplatelet or anticoagulation medications at the time of implantable cardioverter-defibrillator (ICD) device implantation...
  15. pmc Feasibility of endoscopic guidance for nonsurgical transthoracic atrial and ventricular epicardial ablation
    Saman Nazarian
    Department of Medicine, Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
    Heart Rhythm 5:1115-9. 2008
    ..The safety, efficacy, and applicability of epicardial catheter ablation likely will improve with direct visualization of the pericardial space...
  16. doi request reprint Continuation of warfarin during pacemaker or implantable cardioverter-defibrillator implantation: a randomized clinical trial
    Alan Cheng
    Section of Cardiac Electrophysiology, Division of Cardiology, Johns Hopkins Medical Institutes, Baltimore, Maryland, USA
    Heart Rhythm 8:536-40. 2011
    ..Prior studies demonstrate that continuation of warfarin may be safer when compared with strategies requiring interruption and/or heparin bridging. Limited data from randomized trials exist...
  17. doi request reprint Complications of catheter ablation for atrial fibrillation: incidence and predictors
    David D Spragg
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 19:627-31. 2008
    ..We conducted a retrospective analysis of 641 consecutive ablation procedures to assess complication rates, temporal trends, and clinical predictors of adverse outcomes...
  18. pmc Feasibility of real-time magnetic resonance imaging for catheter guidance in electrophysiology studies
    Saman Nazarian
    Department of Medicine, Division of Cardiology, Johns Hopkins Hospital, Carnegie 592C, 600 N Wolfe St, Baltimore, MD 21287, USA
    Circulation 118:223-9. 2008
    ..In this study, we sought to test the feasibility of performing electrophysiology studies with real-time MRI guidance...
  19. pmc A new electrocardiogram marker to identify patients at low risk for ventricular tachyarrhythmias: sum magnitude of the absolute QRST integral
    Larisa G Tereshchenko
    The Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD, USA
    J Electrocardiol 44:208-16. 2011
    ..We proposed and tested a novel electrocardiogram marker of risk of ventricular arrhythmias (VAs)...
  20. pmc Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, 600 N Wolfe St, Baltimore, MD 21287, USA
    Heart Rhythm 9:1594-602. 2012
    ..The clinical importance of the J-point elevation on electrocardiogram is controversial...
  21. pmc Unstable QT interval dynamics precedes ventricular tachycardia onset in patients with acute myocardial infarction: a novel approach to detect instability in QT interval dynamics from clinical ECG
    Xiaozhong Chen
    Department of Biomedical Engineering and Institute for Computational Medicine, Johns Hopkins University, Baltimore, MD 21218, USA
    Circ Arrhythm Electrophysiol 4:858-66. 2011
    ..This study developed a methodology for detecting QT interval (QTI) dynamics instability from the ECG and explored the contribution of PA and QTI instability to ventricular tachycardia (VT) onset...
  22. pmc Quantitative assessment of artifacts on cardiac magnetic resonance imaging of patients with pacemakers and implantable cardioverter-defibrillators
    Takeshi Sasaki
    Department of Medicine Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Circ Cardiovasc Imaging 4:662-70. 2011
    ..This study aims to evaluate the extent of artifacts on cardiac magnetic resonance (CMR) in patients with PM and ICD (PM/ICD)...
  23. pmc Predictive value of beat-to-beat QT variability index across the continuum of left ventricular dysfunction: competing risks of noncardiac or cardiovascular death and sudden or nonsudden cardiac death
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
    Circ Arrhythm Electrophysiol 5:719-27. 2012
    ..The goal of the present study was to determine the predictive value of beat-to-beat QT variability in heart failure patients across the continuum of left ventricular dysfunction...
  24. doi request reprint Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patients with ischemic cardiomyopathy
    David D Spragg
    Division of Cardiology, Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21224, USA
    J Am Coll Cardiol 56:774-81. 2010
    ..We sought to investigate the impact of left ventricular (LV) pacing site on mechanical response to cardiac resynchronization therapy (CRT) in patients with ischemic cardiomyopathy (ICM)...
  25. ncbi request reprint Evidence for electrical remodeling of the native conduction system with cardiac resynchronization therapy
    Charles A Henrikson
    Division of Cardiology, Johns Hopkins University, Baltimore, Maryland 21205, USA
    Pacing Clin Electrophysiol 30:591-5. 2007
    ..Cardiac resynchronization therapy (CRT) improves hemodynamics and decreases heart failure symptoms. However, the potential of CRT to bring about electrical remodeling of the heart has not been investigated...
  26. pmc Feasibility of image-based simulation to estimate ablation target in human ventricular arrhythmia
    Hiroshi Ashikaga
    Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Heart Rhythm 10:1109-16. 2013
    ..Previous studies suggest that magnetic resonance imaging with late gadolinium enhancement (LGE) may identify slowly conducting tissues in scar-related ventricular tachycardia (VT)...
  27. ncbi request reprint Initial experience in the use of integrated electroanatomic mapping with three-dimensional MR/CT images to guide catheter ablation of atrial fibrillation
    Jun Dong
    Department of Medicine, John Hopkins University School of Medicine, Baltimore, MD 21287 0409, USA
    J Cardiovasc Electrophysiol 17:459-66. 2006
    ..No prior studies have reported the use of integrated electroanatomic mapping with preacquired magnetic resonance/computed tomographic (MR/CT) images to guide catheter ablation of atrial fibrillation (AF) in a series of patients...
  28. doi request reprint The critical isthmus sites of ischemic ventricular tachycardia are in zones of tissue heterogeneity, visualized by magnetic resonance imaging
    Heidi L Estner
    Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 20215, USA
    Heart Rhythm 8:1942-9. 2011
    ..A need exists to develop alternative approaches to VT ablation that provide an improved delineation of the arrhythmogenic substrate...
  29. pmc Ventricular arrhythmia is predicted by sum absolute QRST integralbut not by QRS width
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD 21287, USA
    J Electrocardiol 43:548-52. 2010
    ..We explored correlations between QRS width, SAI QRST, and VA in primary prevention implantable cardioverter-defibrillator (ICD) patients with structural heart disease...
  30. ncbi request reprint Prediction of ventricular tachyarrhythmias by intracardiac repolarization variability analysis
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD 21287, USA
    Circ Arrhythm Electrophysiol 2:276-84. 2009
    ....
  31. pmc Beat-to-beat three-dimensional ECG variability predicts ventricular arrhythmia in ICD recipients
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland, USA
    Heart Rhythm 7:1606-13. 2010
    ..Methodological difficulties associated with QT measurements prompt the search for new electrocardiographic markers of repolarization heterogeneity...
  32. doi request reprint Ibutilide-induced changes in the temporal lability of ventricular repolarization in patients with and without structural heart disease
    Alan Cheng
    Section for Cardiac Electrophysiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 20:873-9. 2009
    ..We sought to define the effects of ibutilide on the temporal lability of ventricular repolarization in patients with and without structural heart disease...
  33. ncbi request reprint Diminished left ventricular dyssynchrony and impact of resynchronization in failing hearts with right versus left bundle branch block
    Melissa J Byrne
    Department of Medicine, Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
    J Am Coll Cardiol 50:1484-90. 2007
    ..We compared mechanical dyssynchrony and the impact of cardiac resynchronization therapy (CRT) in failing hearts with a pure right (RBBB) versus left bundle branch block (LBBB)...
  34. pmc Appropriate and inappropriate electrical therapies delivered by an implantable cardioverter-defibrillator: effect on intracardiac electrogram
    Peter Stempniewicz
    Whiting School of Engineering, The Johns Hopkins University, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 22:554-60. 2011
    ..We sought to determine the frequency of LIC after spontaneous events in patients receiving ICD therapies...
  35. pmc Characterization of acute and subacute radiofrequency ablation lesions with nonenhanced magnetic resonance imaging
    Timm Dickfeld
    Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland 21201, USA
    Heart Rhythm 4:208-14. 2007
    ..However, MRI patterns after RF ablation have not been well investigated...
  36. doi request reprint A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devices
    Saman Nazarian
    Johns Hopkins University, Baltimore, Maryland 21287, USA
    Ann Intern Med 155:415-24. 2011
    ..Magnetic resonance imaging (MRI) is avoided in most patients with implanted cardiac devices because of safety concerns...
  37. doi request reprint Diagnostic accuracy of arterial phase 64-slice multidetector CT angiography for left atrial appendage thrombus in patients undergoing atrial fibrillation ablation
    Ilan Gottlieb
    Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21287, USA
    J Cardiovasc Electrophysiol 19:247-51. 2008
    ..Multidetector CT (MDCT) is used prior to atrial fibrillation ablation (AFA) to anatomically guide ablation procedures. Whether 64-slice MDCT also can be used to diagnose left atrial thrombus is not known...
  38. doi request reprint Prospective comparison of the diagnostic utility of a standard event monitor versus a "leadless" portable ECG monitor in the evaluation of patients with palpitations
    Daniel Scherr
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, 600 North Wolfe Street, Carnegie 568, Baltimore, MD 21287, USA
    J Interv Card Electrophysiol 22:39-44. 2008
    ..The aim of this prospective study was to compare a new "leadless" ambulatory monitor with a standard event monitor in the evaluation of patients with palpitations...
  39. pmc Noninvasive assessment of tissue heating during cardiac radiofrequency ablation using MRI thermography
    Aravindan Kolandaivelu
    The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Circ Arrhythm Electrophysiol 3:521-9. 2010
    ..In the current study, we sought to demonstrate the feasibility of MRI thermography during cardiac ablation...
  40. pmc Magnetic resonance assessment of the substrate for inducible ventricular tachycardia in nonischemic cardiomyopathy
    Saman Nazarian
    Department of Medicine Cardiology, Johns Hopkins Hospital, Baltimore, MD 21287, USA
    Circulation 112:2821-5. 2005
    ..However, the substrate for ventricular arrhythmia in patients with nonischemic cardiomyopathy remains poorly understood. We hypothesized that the distribution of scar identified by MRI is predictive of inducible ventricular tachycardia...
  41. pmc QRS prolongation in myotonic muscular dystrophy and diffuse fibrosis on cardiac magnetic resonance
    Saman Nazarian
    Department of Medicine Cardiology, Johns Hopkins University, Baltimore, Maryland 21287, USA
    Magn Reson Med 64:107-14. 2010
    ..The SNRV of the left ventricle is associated with QRS prolongation, likely due to late depolarization of tissue within islands of patchy fibrosis. The association of SNRV with future clinical events warrants further study...
  42. pmc Failure in short-term prediction of ventricular tachycardia and ventricular fibrillation from continuous electrocardiogram in intensive care unit patients
    Molly Sachdev
    Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 0409, USA
    J Electrocardiol 43:400-7. 2010
    ..We sought to test whether electrocardiographic (ECG) markers of autonomic tone, ventricular irritability, and repolarization lability could be used in short-term prediction of ventricular arrhythmias in this patient population...
  43. pmc Arrhythmia risk stratification based on QT interval instability: an intracardiac electrocardiogram study
    Xiaozhong Chen
    Institute for Computational Medicine, Johns Hopkins University, Baltimore, Maryland 21218, USA
    Heart Rhythm 10:875-80. 2013
    ..Experimental studies have demonstrated that unstable repolarization dynamics is a risk factor of arrhythmia. We have recently developed an algorithm to detect QT interval (QTI) instability from the clinical electrocardiogram (ECG)...
  44. pmc ECG marker of adverse electrical remodeling post-myocardial infarction predicts outcomes in MADIT II study
    Larisa G Tereshchenko
    The Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    PLoS ONE 7:e51812. 2012
    ..Post-myocardial infarction (MI) structural remodeling is characterized by left ventricular dilatation, fibrosis, and hypertrophy of the non-infarcted myocardium...
  45. doi request reprint QT variability paradox after premature ventricular contraction in patients with structural heart disease and ventricular arrhythmias
    Durgesh Das
    Whiting School of Engineering, The Johns Hopkins University, Baltimore, MD, USA
    J Electrocardiol 45:652-7. 2012
    ..Premature ventricular contractions (PVCs) are excluded from the analysis of QT variability. However, QT dynamics after PVCs is poorly understood...
  46. ncbi request reprint Rhythm discrimination during uninterrupted CPR using motion artifact reduction system
    Ronald D Berger
    Department of Medicine, The Johns Hopkins University School of Medicine, 600N Wolfe Street Carnegie 592, Baltimore, MD 21287 0409, USA
    Resuscitation 75:145-52. 2007
    ..We developed a motion artifact reduction system (MARS), based on adaptive noise cancellation techniques, for use during CPR. We hypothesized that this system would allow for automated rhythm discrimination during uninterrupted CPR...
  47. doi request reprint Intracardiac QT variability in patients with structural heart disease on class III antiarrhythmic drugs
    Larisa G Tereshchenko
    The Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, 600 N Wolfe Street, Baltimore, MD 21287, USA
    J Electrocardiol 42:505-10. 2009
    ..Increased intracardiac QT variability after adjustment for class III AADs use carried independent risk of life-threatening ventricular tachyarrhythmias...
  48. ncbi request reprint Three-dimensional mapping of optimal left ventricular pacing site for cardiac resynchronization
    Robert H Helm
    Division of Cardiology, Johns Hopkins University, 720 Rutland Ave, Baltimore, MD 21205, USA
    Circulation 115:953-61. 2007
    ..The geographic extent and 3-dimensional distribution of left ventricular (LV) locations yielding optimal CRT remain unknown...
  49. doi request reprint Determinants of gradient field-induced current in a pacemaker lead system in a magnetic resonance imaging environment
    Harikrishna Tandri
    Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
    Heart Rhythm 5:462-8. 2008
    ..The determinants of low-frequency-induced current by magnetic resonance imaging (MRI) gradient fields in a pacemaker lead system are largely unknown...
  50. pmc Magnetic resonance-based anatomical analysis of scar-related ventricular tachycardia: implications for catheter ablation
    Hiroshi Ashikaga
    Division of Cardiology, Johns Hopkins University School of Medicine, 720 Rutland Ave, Traylor 903, Baltimore, MD 20215, USA
    Circ Res 101:939-47. 2007
    ..Magnetic resonance-based visualization of scar morphology would potentially contribute to preprocedural planning for catheter ablation of scar-related, unmappable VT...
  51. ncbi request reprint Predictors of appropriate implantable defibrillator therapies in patients with arrhythmogenic right ventricular dysplasia
    Jonathan P Piccini
    Division of Cardiology, Department of Medicine, The Johns Hopkins Hospital, 600 N Wolfe Street, Carnegie 592, Baltimore, MD 21287, USA
    Heart Rhythm 2:1188-94. 2005
    ..The risk factors for sudden death and indications for implantable cardioverter-defibrillator (ICD) placement in patients with ARVD are not well defined...
  52. ncbi request reprint Integrated electroanatomic mapping with three-dimensional computed tomographic images for real-time guided ablations
    Jun Dong
    Johns Hopkins University School of Medicine, Baltimore, MD, USA
    Circulation 113:186-94. 2006
    ..This study sought to evaluate the accuracy of the first clinically available image integration system for catheter ablation on 3-dimensional (3D) computed tomography (CT) images in real time...
  53. doi request reprint Premature failure of a Riata defibrillator lead without impedance change or inappropriate sensing: a case report and review of the literature
    Angela Krebsbach
    Section of Cardiac Electrophysiology, Division of Cardiology, Johns Hopkins Medical Institutes, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 22:1070-2. 2011
    ..After extraction, a tear in the insulation of the lead was noted allowing the inner wire to protrude. This case illustrates a novel mechanism of insulation failure without inappropriate sensing or impedance change...
  54. pmc The value of defibrillator far-field electrograms for ablation of idiopathic ventricular fibrillation
    Binu Philips
    Division of Cardiology Cardiac Arrhythmia, Johns Hopkins University School of Medicine, 600 N Wolfe Street, Baltimore, MD 21287, USA
    Europace 14:607-8. 2012
    ..We report a case of idiopathic ventricular fibrillation treated by catheter ablation of the monomorphic initiating premature beat. The initiating focus was identified using intacardiac defibrillator electrograms (EGMs)...
  55. pmc Frailty and impaired cardiac autonomic control: new insights from principal components aggregation of traditional heart rate variability indices
    Ravi Varadhan
    The Center on Aging and Health, Johns Hopkins University, Baltimore, Maryland, USA
    J Gerontol A Biol Sci Med Sci 64:682-7. 2009
    ..We propose a new measure of heart rate variability (HRV) to capture the impairment in cardiac autonomic control associated with frailty...
  56. ncbi request reprint Idiopathic ventricular tachycardia originating in the great cardiac vein
    Glenn R Meininger
    Department of Medicine, Division of Cardiology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    Heart Rhythm 3:464-6. 2006
  57. ncbi request reprint Imaging of myocardial dyssynchrony in congestive heart failure
    Boaz D Rosen
    Division of Cardiology, Johns Hopkins University, Baltimore, MD, USA
    Heart Fail Rev 11:289-303. 2006
    ..Dyssnchrony imaging is a rapidly evolving field. New imaging techniques such as speckle tracking are promising and close update is needed to keep track of the developments and the changes in this exciting field...
  58. ncbi request reprint Short-term effects of right-left heart sequential cardiac resynchronization in patients with heart failure, chronic atrial fibrillation, and atrioventricular nodal block
    Ilan Hay
    Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD, USA
    Circulation 110:3404-10. 2004
    ..Whether altering the site of stimulation can offset this detrimental effect and what role sequential right ventricular-left ventricular (RV-LV) stimulation might play in such patients remain unknown...
  59. doi request reprint Response to atrial extrastimulus during supraventricular tachycardia: what is the mechanism?
    Binu Philips
    Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
    J Cardiovasc Electrophysiol 24:359-63. 2013
    ..This teaching case demonstrates a novel exception to a recently reported diagnostic pacing maneuver and illustrates the importance of considering response to multiple maneuvers in reaching a diagnosis of SVT mechanism...
  60. doi request reprint Electrophysiology studies in patients undergoing ICD implantation: findings from the NCDR®
    Alan Cheng
    Section of Cardiac Electrophysiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Pacing Clin Electrophysiol 35:912-8. 2012
    ..The extent of EPS use in patients undergoing ICD implantation in the current era remains unknown...
  61. doi request reprint Successful cryothermal ablation for Atrioventricular nodal reentry tachycardia after radiofrequency ablation failure
    Fawaz Alhumaid
    Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
    J Interv Card Electrophysiol 34:89-92. 2012
    ..For challenging AVNRT cases, where RFA produced signs of impending AV block, we evaluate the application of Cryo to the same anatomical location where RFA was abandoned...
  62. doi request reprint Switchable Faraday shielding with application to reducing the pain of internal cardiac defibrillation while permitting external defibrillation
    Aravindan Kolandaivelu
    Cardiology Division, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
    IEEE Trans Biomed Eng 59:409-16. 2012
    ..Similar analysis could also guide optimizing the switchable Faraday shielding concept for other applications...
  63. doi request reprint Strong coherence between heart rate variability and intracardiac repolarization lability during biventricular pacing is associated with reverse electrical remodeling of the native conduction and improved outcome
    Larisa G Tereshchenko
    The Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD, USA
    J Electrocardiol 44:713-7. 2011
    ..Still, mechanisms of RER are largely unknown. In this study, we explored repolarization lability during biventricular pacing...
  64. doi request reprint Antiarrhythmic effect of reverse electrical remodeling associated with cardiac resynchronization therapy
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
    Pacing Clin Electrophysiol 34:357-64. 2011
    ..We hypothesized that reverse electrical remodeling (RER) with CRT is associated with reduced frequency of ventricular tachyarrhythmias (VTs)...
  65. pmc Transient local injury current in right ventricular electrogram after implantable cardioverter-defibrillator shock predicts heart failure progression
    Larisa G Tereshchenko
    Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
    J Am Coll Cardiol 54:822-8. 2009
    ..This study aimed to identify an early marker of functional impairment after an implantable cardioverter-defibrillator (ICD) shock as a predictor of heart failure progression...
  66. ncbi request reprint Prognostic value of heart rate variability in chronic congestive heart failure (Veterans Affairs' Survival Trial of Antiarrhythmic Therapy in Congestive Heart Failure)
    Kenneth C Bilchick
    Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Am J Cardiol 90:24-8. 2002
    ..3 ms had a significantly increased risk of sudden death (p = 0.016). Thus, HRV was the sole independent predictor of overall mortality and was significantly associated with sudden death in this population...
  67. pmc Modern pacemaker and implantable cardioverter/defibrillator systems can be magnetic resonance imaging safe: in vitro and in vivo assessment of safety and function at 1.5 T
    Ariel Roguin
    Department of Medicine, Division of Cardiology, Johns Hopkins Medical Institutions, Baltimore, MD, USA
    Circulation 110:475-82. 2004
    ..These devices are now smaller, with less magnetic material and improved electromagnetic interference protection. Our aim was to determine whether these modern systems can be used in an MR environment...
  68. doi request reprint Influence of atrial function and mechanical synchrony on LV hemodynamic status in heart failure patients on resynchronization therapy
    Hsin Yueh Liang
    Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    JACC Cardiovasc Imaging 4:691-8. 2011
    ..The aim of this study was to evaluate atrial and ventricular function in patients undergoing cardiac resynchronization therapy (CRT)...
  69. ncbi request reprint The Rhythm ID Going Head to Head Trial (RIGHT): design of a randomized trial comparing competitive rhythm discrimination algorithms in implantable cardioverter defibrillators
    Ronald D Berger
    Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 17:749-53. 2006
    ..RIGHT is a randomized, prospective study that will assess the differential efficacy of ICDs from two different manufacturers. It is the first trial to compare directly competitive ICD rhythm discrimination algorithms on a large scale...
  70. doi request reprint How to avoid inappropriate shocks
    David D Spragg
    Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
    Heart Rhythm 5:762-5. 2008
  71. ncbi request reprint QT variability
    Ronald D Berger
    Department of Medicine, John Hopkins University School of Medicine, Baltimore, MD 21287, USA
    J Electrocardiol 36:83-7. 2003
    ..QT variability is a marker of electrical disease in the ventricle and may be associated with enhanced risk of life-threatening arrhythmias...
  72. ncbi request reprint Implantable cardioverter-defibrillators in patients with arrhythmogenic right ventricular dysplasia/cardiomyopathy
    Ariel Roguin
    Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland, USA
    J Am Coll Cardiol 43:1843-52. 2004
    ..The aim of this study was to assess the outcome of arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) patients treated with an implantable cardioverter-defibrillator (ICD)...
  73. ncbi request reprint Temporal repolarization lability differences among genotyped patients with the long QT syndrome
    Kenneth Bilchick
    Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Am J Cardiol 94:1312-6. 2004
    ..973 +/- 0.394, p = 0.01 vs controls) and in patients with LQT1 with mutations other than KCNQ1-FIN (-0.942 +/- 0.264, p = 0.04 vs controls) but was similar between the KCNQ1-FIN group and controls...
  74. ncbi request reprint Internal defibrillation with minimal skeletal muscle activation: a new paradigm toward painless defibrillation
    Vinod Jayam
    Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
    Heart Rhythm 2:1108-13. 2005
    ..In an effort to develop a painless defibrillation system, we designed an electrode arrangement that incorporates a conductive sock placed around the heart to confine the electric shock field to cardiac tissue...
  75. ncbi request reprint Heart rate variability
    Kenneth C Bilchick
    Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
    J Cardiovasc Electrophysiol 17:691-4. 2006
  76. ncbi request reprint Direct visualization of coronary sinus ostium and branches with a flexible steerable fiberoptic infrared endoscope
    Saman Nazarian
    Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
    Heart Rhythm 2:844-8. 2005
    ..This study reports our experience with navigation into and within the coronary sinus in a closed-chest animal preparation, using a flexible steerable fiberoptic infrared endoscope that allows visualization through flowing blood...
  77. ncbi request reprint Cardiac resynchronization and death from progressive heart failure: a meta-analysis of randomized controlled trials
    David J Bradley
    Division of Cardiology, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
    JAMA 289:730-40. 2003
    ..Cardiac resynchronization, a pacemaker-based therapy for heart failure, enhances cardiac performance and quality of life, but its effect on mortality is uncertain...
  78. ncbi request reprint Beat-to-beat QT interval variability associated with acute myocardial ischemia
    Taizo Murabayashi
    Cardiology Division, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA
    J Electrocardiol 35:19-25. 2002
    ..Acute ischemia is associated with labile ventricular repolarization, which manifests as enhanced beat-to-beat QT interval variability. The association between ischemic repolarization liability and arrhythmic risk deserves further study...