Gopi Dandamudi - Academia.edu (original) (raw)

Papers by Gopi Dandamudi

Catheter Ablation of Cardiac Arrhythmias, 2019

Journal of Cardiovascular Electrophysiology, 2019

This article has been accepted for publication and undergone full peer review but has not been th... more This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Trends in Cardiovascular Medicine, 2019

His bundle pacing (HBP) has continued to evolve over the past decade and has started to become a ... more His bundle pacing (HBP) has continued to evolve over the past decade and has started to become a global phenomenon. Evidence is mounting of its clinical benefits as compared to both right ventricular and left ventricular pacing. In this paper, we review recent data in support of His bundle pacing and some of the challenges facing us as we advocate its increasing role in clinical practice.

Heart Rhythm, 2018

His bundle pacing (HBP) prevents ventricular dyssynchrony and its long-term consequences by prese... more His bundle pacing (HBP) prevents ventricular dyssynchrony and its long-term consequences by preserving normal electrical activation of the ventricles. Since the original description of permanent HBP in 2000, the adoption of HBP has increased over the last several years. However the reporting of procedural and clinical outcomes to date is not uniform. This paper is a collaboration between several implanters with significant experience in HBP to establish a uniform set of definitions encompassing the different forms of HBP, as well as define a standardized approach to gathering data endpoints to ensure consistency in reported outcomes.

Journal of Innovations in Cardiac Rhythm Management, 2017

Permanent His-bundle pacing (HBP) is a true physiological form of ventricular pacing that has bee... more Permanent His-bundle pacing (HBP) is a true physiological form of ventricular pacing that has been shown in recent years to be both safe and feasible in clinical practice. However, there are limited data about its long-term performance, especially when compared with both right ventricular and biventricular pacing. In this article, we present a thought-provoking case study that illustrates the usefulness of permanent HBP in a patient with long-standing complete infranodal heart block and progressive heart failure, and discuss the current literature highlighting the evidence behind this form of permanent pacing.

Journal of Electrocardiology, 2017

Chronic right ventricular (RV) pacing has been shown over the years to exert detrimental physiolo... more Chronic right ventricular (RV) pacing has been shown over the years to exert detrimental physiological changes including increased risk for heart failure and atrial fibrillation. His bundle pacing offers the promise of physiological activation of the ventricular tissue, with the potential for reducing the detrimental effects of RV pacing. We describe His bundle pacing in a historical context and briefly highlight several clinical trials that have helped shape the landscape of permanent His bundle pacing.

Journal of Electrocardiology, 2016

Background: Permanent His bundle pacing (HBP) is a physiological alternative to right ventricular... more Background: Permanent His bundle pacing (HBP) is a physiological alternative to right ventricular pacing (RVP). Catheter manipulation during HBP can cause trauma to the His bundle during implantation. We sought to determine acute and long-term incidence of His bundle (HB) injury with HBP. Methods: Patients undergoing permanent HBP at Geisinger Wyoming Valley Medical Center from 2006 to 2014 formed the study group. Patients with pre-existing His-Purkinje disease (HPD) were excluded from the study. Any development of new bundle branch block (BBB) or AV block (B) during acute HBP lead-induced block was recorded. Resolution of AVB and/or BBB was documented. Results: HBP was attempted in 450 patients. In 358 patients without HPD, 28 (7.8%) developed acute HB injury in the form of complete AVB (4, 1.1%), RBBB (21, 5.9%) or LBBB (3, 0.8%) during HBP lead placement. In all 7 patients with AVB or LBBB, conduction completely recovered. The HB electrogram from the lead displayed injury current in all 7 patients. Lead-induced RBBB resolved in 12 of 21 patients and persisted in 9 (2.5%) patients. Pacing from the HBP lead resulted in correction of acute conduction block in 27 of 28 patients and 8 of 9 patients with chronic RBBB. None of the patients with transient conduction block developed new conduction disease during follow-up of 21 ± 19 months. Conclusions: Despite acute trauma to HB in 7.8% of patients undergoing permanent HBP, complete resolution of conduction block occurred in 19 of 28 patients (68%). RBBB persisted in 9 patients (32%) but mostly normalized with HBP.

Cardiac Mapping

Page 1. 29 CHAPTER 29 Endocardial Catheter Pace Mapping of Ventricular Tachycardias Mithilesh K. ... more Page 1. 29 CHAPTER 29 Endocardial Catheter Pace Mapping of Ventricular Tachycardias Mithilesh K. Das, MD, John C. Lopshire, MD, Deepak Bhakta, MD, Anil V. Yadav, MD, John M. Miller, MD Indiana University School of Medicine, Indianapolis, IN, USA Summary ...

Circulation: Arrhythmia and Electrophysiology, 2008

Background— Fragmented QRS (duration <120 ms) on a 12-lead ECG represents myocardial scar in p... more Background— Fragmented QRS (duration <120 ms) on a 12-lead ECG represents myocardial scar in patients with coronary artery disease. However, the significance of fragmented QRS has not been defined in the presence of a wide QRS (wQRS; duration ≥120 ms). We postulate that fragmented wQRS (f-wQRS) due to bundle branch block, premature ventricular complexes, or paced rhythms (f-pQRS) signify myocardial scar and higher mortality. Methods and Results— Patients who underwent cardiac evaluation with nuclear stress imaging or cardiac catheterization and had wQRS (bundle branch block, premature ventricular complex, or pQRS) were studied. f-wQRS was defined by the presence of >2 notches on the R wave or the S wave and had to be present in ≥2 contiguous inferior (II, III, aVF), lateral (I, aVL, V 6 ) or anterior (V 1 to V 5 ) leads. ECG analyses of 879 patients (age, 66.7�11.4 years; male, 97%; mean follow-up, 29�18 months) with bundle branch block (n=310), premature ventricular complex (...

Journal of the American College of Cardiology, 2011

Background: Radiofrequency catheter ablation (RFCA) is an effective treatment for atrial fibrilla... more Background: Radiofrequency catheter ablation (RFCA) is an effective treatment for atrial fibrillation (AF). We assessed the hypothesis that high left atrial pressures can predict AF recurrence following catheter ablation.

Heart Rhythm, 2007

Fragmented QRS (fQRS) on a 12-lead electrocardiogram (ECG) is associated with myocardial scar in ... more Fragmented QRS (fQRS) on a 12-lead electrocardiogram (ECG) is associated with myocardial scar in patients with coronary artery disease (CAD). We postulated that fQRS is a predictor of cardiac events and mortality in patients who have known CAD or who are being evaluated for CAD. The cardiac events (myocardial infarction, need for revascularization, or cardiac death) and all-cause mortality were retrospectively reviewed in 998 patients (mean age 65.5 +/- 11.9 years, male 967) who underwent nuclear stress test. The fQRS on a 12-lead ECG included various RSR&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; patterns (&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; or =1 R&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; prime or notching of S wave or R wave) without typical bundle branch block in 2 contiguous leads corresponding to a major coronary artery territory. All-cause mortality (93 [34.1%] vs 188 [25.9%]) and cardiac event rate (135 [49.5%] vs 200 [27.6%]) were higher in the fQRS group compared with the non-fQRS group during a mean follow-up of 57 +/- 23 months. A Kaplan-Meier survival analysis revealed significantly lower event-free survival for cardiac events (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;.001) and all-cause mortality (P = .02). Multivariate Cox regression analysis revealed that significant fQRS was an independent significant predictor for cardiac events but not for all-cause mortality. The Kaplan-Meier survival analysis showed no significant difference between fQRS and Q waves groups for cardiac events (P = .48) and all-cause mortality (P = .08). The fQRS is an independent predictor of cardiac events in patients with CAD. It is associated with significantly lower event-free survival for a cardiac event on long-term follow-up.

Heart Rhythm, 2010

Nonischemic dilated cardiomyopathy (NICM) is associated with diffuse global hypokinesia on echoca... more Nonischemic dilated cardiomyopathy (NICM) is associated with diffuse global hypokinesia on echocardiography. However, NICM also may be associated with segmental wall-motion abnormalities (SWMAs) even in the presence of global hypokinesia, probably secondary to patchy myocardial scars. Because myocardial scars serve as substrate for reentry, the purpose of this study was to determine whether SWMA is a predictor of ventricular arrhythmic events in NICM. Echocardiographic parameters and appropriate implantable cardioverter-defibrillator (ICD) therapy for arrhythmic events (shock or antitachycardia pacing) were studied in NICM patients with an ICD. Two-dimensional echocardiography of the left ventricle was recorded in a 16-segment model. SWMA was defined by the presence of akinesia or moderate to severe hypokinesia in at least two segments. Patients were divided into one of two groups according to the presence (SWMA group) or the absence (non-SMWA group) of SWMA. SWMA was present in 47.5% of 101 patients (mean age 58.0 ± 15.6 years, 85% male, primary prophylaxis indication 46%, mean ejection fraction 26% ± 9%, mean follow-up 29 ± 18.4 months) studied. No significant difference in mean age, ejection fraction, and QRS duration was seen between SWMA and non-SWMA groups. The SWMA group had a significantly higher incidence of arrhythmic events than did the non-SWMA group (65% vs 15%, P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;.001). Kaplan-Meier survival analysis revealed that SMWA was associated with significantly reduced time to first arrhythmic event (P = .001). SWMA (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001), New York Heart Association heart failure class (P = .016), and secondary prevention indication for ICD placement (P = .005) were significant independent predictors of an arrhythmic event. SWMA did not predict mortality. SWMA is an independent predictor of arrhythmic events in patients with NICM.

Circulation. Arrhythmia and electrophysiology, 2009

E sophageal fistula is a rare but devastating complication that may occur after catheter ablation... more E sophageal fistula is a rare but devastating complication that may occur after catheter ablation of atrial fibrillation. 1 The mechanism of esophageal injury is not known. Potential mechanisms for injury include direct thermal injury and ischemic injury from damage to the esophageal blood supply. Current ablation strategies use various methods to avoid esophageal injury. We describe an unusual manifestation of esophageal injury despite multiple preventive measures.

Journal of Cardiovascular Electrophysiology

JACC: Clinical Electrophysiology