Research Topics
| Ronald D BergerSummaryAffiliation: Johns Hopkins University Country: USA Publications
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Detail Information
Publications
Beat-to-beat QT interval variability: novel evidence for repolarization lability in ischemic and nonischemic dilated cardiomyopathyR 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...
Incidence and predictors of left atrial thrombus prior to catheter ablation of atrial fibrillationDaniel 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...
Cardiac magnetic resonance assessment of dyssynchrony and myocardial scar predicts function class improvement following cardiac resynchronization therapyKenneth 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....- Long- and short-term temporal stability of complex fractionated atrial electrograms in human left atrium during atrial fibrillationDaniel 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... - The benefit of upgrading chronically right ventricle-paced heart failure patients to resynchronization therapy demonstrated by strain rate imagingZayd 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... - Incidence and predictors of periprocedural cerebrovascular accident in patients undergoing catheter ablation of atrial fibrillationDaniel 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... - 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 teslaSaman 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... - Effects of surgical and endoscopic electrocautery on modern-day permanent pacemaker and implantable cardioverter-defibrillator systemsAlan 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... - Impact of heart rhythm status on registration accuracy of the left atrium for catheter ablation of atrial fibrillationJun 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... - Automated detection and characterization of complex fractionated atrial electrograms in human left atrium during atrial fibrillationDaniel 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... - Dual antiplatelet therapy and heparin "bridging" significantly increase the risk of bleeding complications after pacemaker or implantable cardioverter-defibrillator device implantationChristine 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... - Novel electrode design for potentially painless internal defibrillation also allows for successful external defibrillationVenku Jayanti
Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287 0409, USA
J Cardiovasc Electrophysiol 18:1095-100. 2007.... - A new electrocardiogram marker to identify patients at low risk for ventricular tachyarrhythmias: sum magnitude of the absolute QRST integralLarisa 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)... - Feasibility of endoscopic guidance for nonsurgical transthoracic atrial and ventricular epicardial ablationSaman 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... - Continuation of warfarin during pacemaker or implantable cardioverter-defibrillator implantation: a randomized clinical trialAlan 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... - Feasibility of real-time magnetic resonance imaging for catheter guidance in electrophysiology studiesSaman 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... - Complications of catheter ablation for atrial fibrillation: incidence and predictorsDavid 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... - Quantitative assessment of artifacts on cardiac magnetic resonance imaging of patients with pacemakers and implantable cardioverter-defibrillatorsTakeshi 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)... - 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 deathLarisa 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... - 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 ECGXiaozhong 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... - Initial experience in the use of integrated electroanatomic mapping with three-dimensional MR/CT images to guide catheter ablation of atrial fibrillationJun 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... - Optimal left ventricular endocardial pacing sites for cardiac resynchronization therapy in patients with ischemic cardiomyopathyDavid 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)... - Evidence for electrical remodeling of the native conduction system with cardiac resynchronization therapyCharles 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... - The critical isthmus sites of ischemic ventricular tachycardia are in zones of tissue heterogeneity, visualized by magnetic resonance imagingHeidi 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... - Ventricular arrhythmia is predicted by sum absolute QRST integralbut not by QRS widthLarisa 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... - Prediction of ventricular tachyarrhythmias by intracardiac repolarization variability analysisLarisa G Tereshchenko
Division of Cardiology, Department of Medicine, Johns Hopkins Hospital, Baltimore, MD 21287, USA
Circ Arrhythm Electrophysiol 2:276-84. 2009.... - Ibutilide-induced changes in the temporal lability of ventricular repolarization in patients with and without structural heart diseaseAlan 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... - Beat-to-beat three-dimensional ECG variability predicts ventricular arrhythmia in ICD recipientsLarisa 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... - Appropriate and inappropriate electrical therapies delivered by an implantable cardioverter-defibrillator: effect on intracardiac electrogramPeter 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... - Diminished left ventricular dyssynchrony and impact of resynchronization in failing hearts with right versus left bundle branch blockMelissa 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)... - Characterization of acute and subacute radiofrequency ablation lesions with nonenhanced magnetic resonance imagingTimm 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... - A prospective evaluation of a protocol for magnetic resonance imaging of patients with implanted cardiac devicesSaman 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... - Diagnostic accuracy of arterial phase 64-slice multidetector CT angiography for left atrial appendage thrombus in patients undergoing atrial fibrillation ablationIlan 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... - Magnetic resonance assessment of the substrate for inducible ventricular tachycardia in nonischemic cardiomyopathySaman 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... - Failure in short-term prediction of ventricular tachycardia and ventricular fibrillation from continuous electrocardiogram in intensive care unit patientsMolly 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... - QRS prolongation in myotonic muscular dystrophy and diffuse fibrosis on cardiac magnetic resonanceSaman 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... - Noninvasive assessment of tissue heating during cardiac radiofrequency ablation using MRI thermographyAravindan 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... - Prospective comparison of the diagnostic utility of a standard event monitor versus a "leadless" portable ECG monitor in the evaluation of patients with palpitationsDaniel 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... - Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillatorLarisa 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... - Magnetic resonance-based anatomical analysis of scar-related ventricular tachycardia: implications for catheter ablationHiroshi 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... - Intracardiac QT variability in patients with structural heart disease on class III antiarrhythmic drugsLarisa 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... - Predictors of appropriate implantable defibrillator therapies in patients with arrhythmogenic right ventricular dysplasiaJonathan 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..Further research is needed to confirm that a low-risk subset of patients who may not require ICD placement can be identified... - Integrated electroanatomic mapping with three-dimensional computed tomographic images for real-time guided ablationsJun Dong
Johns Hopkins University School of Medicine, Baltimore, MD, USA
Circulation 113:186-94. 2006..This may provide significant advantages for anatomically based procedures such as ablation of atrial fibrillation and nonidiopathic ventricular tachycardia... - Rhythm discrimination during uninterrupted CPR using motion artifact reduction systemRonald 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... - Determinants of gradient field-induced current in a pacemaker lead system in a magnetic resonance imaging environmentHarikrishna 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... - Three-dimensional mapping of optimal left ventricular pacing site for cardiac resynchronizationRobert 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... - Premature failure of a Riata defibrillator lead without impedance change or inappropriate sensing: a case report and review of the literatureAngela 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... - The value of defibrillator far-field electrograms for ablation of idiopathic ventricular fibrillationBinu 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)... - Imaging of myocardial dyssynchrony in congestive heart failureBoaz 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... - Frailty and impaired cardiac autonomic control: new insights from principal components aggregation of traditional heart rate variability indicesRavi 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... - Short-term effects of right-left heart sequential cardiac resynchronization in patients with heart failure, chronic atrial fibrillation, and atrioventricular nodal blockIlan Hay
Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD, USA
Circulation 110:3404-10. 2004..Sequential RV-LV stimulation offers minimal benefit on average and should perhaps be considered only in targeted subsets such as nonresponding patients... - Idiopathic ventricular tachycardia originating in the great cardiac veinGlenn 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 - Successful cryothermal ablation for Atrioventricular nodal reentry tachycardia after radiofrequency ablation failureFawaz 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... - Switchable Faraday shielding with application to reducing the pain of internal cardiac defibrillation while permitting external defibrillationAravindan 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... - 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 outcomeLarisa 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... - 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... - 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 TAriel Roguin
Department of Medicine, Division of Cardiology, Johns Hopkins Medical Institutions, Baltimore, MD, USA
Circulation 110:475-82. 2004..CONCLUSIONS: These data suggest that certain modern pacemaker and ICD systems may indeed be MRI safe. This may have major clinical implications for current imaging practices... - Transient local injury current in right ventricular electrogram after implantable cardioverter-defibrillator shock predicts heart failure progressionLarisa 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... - Antiarrhythmic effect of reverse electrical remodeling associated with cardiac resynchronization therapyLarisa 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)... - Influence of atrial function and mechanical synchrony on LV hemodynamic status in heart failure patients on resynchronization therapyHsin 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)... - The Rhythm ID Going Head to Head Trial (RIGHT): design of a randomized trial comparing competitive rhythm discrimination algorithms in implantable cardioverter defibrillatorsRonald D Berger
Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
J Cardiovasc Electrophysiol 17:749-53. 2006..CONCLUSION: RIGHT is the first randomized, large scale, head-to-head comparison of ICD discrimination algorithms... - Temporal repolarization lability differences among genotyped patients with the long QT syndromeKenneth 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... - How to avoid inappropriate shocksDavid D Spragg
Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland 21287, USA
Heart Rhythm 5:762-5. 2008 - Internal defibrillation with minimal skeletal muscle activation: a new paradigm toward painless defibrillationVinod Jayam
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
Heart Rhythm 2:1108-13. 2005..Refinement of this strategy may allow for delivery of painless shocks by ICDs. Further development is needed to overcome implant complexity and the higher external DFT with this type of electrode system... - Implantable cardioverter-defibrillators in patients with arrhythmogenic right ventricular dysplasia/cardiomyopathyAriel Roguin
Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland, USA
J Am Coll Cardiol 43:1843-52. 2004..23 to 101.24, p = 0.031). CONCLUSIONS: Patients with ARVD/C have a high arrhythmia rate requiring appropriate ICD interventions. The ICD therapy appears to be well tolerated and important in the management of patients with ARVD/C... - Heart rate variabilityKenneth C Bilchick
Johns Hopkins Medical Institutions, Baltimore, Maryland, USA
J Cardiovasc Electrophysiol 17:691-4. 2006 - QT variabilityRonald 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... - Direct visualization of coronary sinus ostium and branches with a flexible steerable fiberoptic infrared endoscopeSaman 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... - Cardiac resynchronization and death from progressive heart failure: a meta-analysis of randomized controlled trialsDavid 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... - Beat-to-beat QT interval variability associated with acute myocardial ischemiaTaizo 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...