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Cano Ó, Navarrete-Navarro J, Jover P, Osca J, Izquierdo M, Navarro J, Ayala HD, Martínez-Dolz L. Conduction System Pacing for Cardiac Resynchronization Therapy. J Cardiovasc Dev Dis 2023; 10:448. [PMID: 37998506 PMCID: PMC10672305 DOI: 10.3390/jcdd10110448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/18/2023] [Accepted: 10/25/2023] [Indexed: 11/25/2023] Open
Abstract
Cardiac resynchronization therapy (CRT) via biventricular pacing (BiVP-CRT) is considered a mainstay treatment for symptomatic heart failure patients with reduced ejection fraction and wide QRS. However, up to one-third of patients receiving BiVP-CRT are considered non-responders to the therapy. Multiple strategies have been proposed to maximize the percentage of CRT responders including two new physiological pacing modalities that have emerged in recent years: His bundle pacing (HBP) and left bundle branch area pacing (LBBAP). Both pacing techniques aim at restoring the normal electrical activation of the ventricles through the native conduction system in opposition to the cell-to-cell activation of conventional right ventricular myocardial pacing. Conduction system pacing (CSP), including both HBP and LBBAP, appears to be a promising pacing modality for delivering CRT and has proven to be safe and feasible in this particular setting. This article will review the current state of the art of CSP-based CRT, its limitations, and future directions.
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Affiliation(s)
- Óscar Cano
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Centro de Investigaciones Biomédicas en RED en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Javier Navarrete-Navarro
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Pablo Jover
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Joaquín Osca
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Centro de Investigaciones Biomédicas en RED en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Maite Izquierdo
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Centro de Investigaciones Biomédicas en RED en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Josep Navarro
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
| | - Hebert D. Ayala
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
| | - Luis Martínez-Dolz
- Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain (H.D.A.)
- Centro de Investigaciones Biomédicas en RED en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
- Instituto de Investigación Sanitaria La Fe, 46026 Valencia, Spain
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Fan L, Namani R, Choy JS, Awakeem Y, Kassab GS, Lee LC. Role of coronary flow regulation and cardiac-coronary coupling in mechanical dyssynchrony associated with right ventricular pacing. Am J Physiol Heart Circ Physiol 2020; 320:H1037-H1054. [PMID: 33356963 DOI: 10.1152/ajpheart.00549.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mechanical dyssynchrony (MD) affects left ventricular (LV) mechanics and coronary perfusion. To understand the multifactorial effects of MD, we developed a computational model that bidirectionally couples the systemic circulation with the LV and coronary perfusion with flow regulation. In the model, coronary flow in the left anterior descending (LAD) and left circumflex (LCX) arteries affects the corresponding regional contractility based on a prescribed linear LV contractility-coronary flow relationship. The model is calibrated with experimental measurements of LV pressure and volume, as well as LAD and LCX flow rate waveforms acquired under regulated and fully dilated conditions from a swine under right atrial (RA) pacing. The calibrated model is applied to simulate MD. The model can simultaneously reproduce the reduction in mean LV pressure (39.3%), regulated flow (LAD: 7.9%; LCX: 1.9%), LAD passive flow (21.6%), and increase in LCX passive flow (15.9%). These changes are associated with right ventricular pacing compared with RA pacing measured in the same swine only when LV contractility is affected by flow alterations with a slope of 1.4 mmHg/mL2 in a contractility-flow relationship. In sensitivity analyses, the model predicts that coronary flow reserve (CFR) decreases and increases in the LAD and LCX with increasing delay in LV free wall contraction. These findings suggest that asynchronous activation associated with MD impacts 1) the loading conditions that further affect the coronary flow, which may explain some of the changes in CFR, and 2) the coronary flow that reduces global contractility, which contributes to the reduction in LV pressure.NEW & NOTEWORTHY A computational model that couples the systemic circulation of the left ventricular (LV) and coronary perfusion with flow regulation is developed to study the effects of mechanical dyssynchrony. The delayed contraction in the LV free wall with respect to the septum has a significant effect on LV function and coronary flow reserve.
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Affiliation(s)
- Lei Fan
- Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan
| | - Ravi Namani
- Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan
| | - Jenny S Choy
- California Medical Innovation Institute, San Diego, California
| | - Yousif Awakeem
- California Medical Innovation Institute, San Diego, California
| | | | - Lik Chuan Lee
- Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan
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Left bundle branch area. A new site for physiological pacing: a pilot study. Heart Vessels 2020; 35:1563-1572. [DOI: 10.1007/s00380-020-01623-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 05/15/2020] [Indexed: 11/26/2022]
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Abstract
Cardiac resynchronization therapy constitutes a cornerstone in advanced heart failure treatment, when there is evidence of dyssynchrony, especially by electrocardiography. However, it is plagued both by persistently high (~30%) rates of nonresponse and by deterioration of right ventricular function, owing to iatrogenic dyssynchrony in the context of persistent apical pacing to ensure delivery of biventricular pacing. Left ventricular pacing has long been considered an alternative to standard biventricular pacing and can be achieved as easily as inserting a single pacing electrode in the coronary sinus. Although monoventricular left ventricular pacing has been proven to yield comparable results with the standard biventricular modality, it is the advent of preferential left ventricular pacing, combining both the powerful resynchronization potential of multipolar coronary sinus and right-sided electrodes acting in concert and the ability to preserve intrinsic, physiological right ventricular activation. In this review, we aim to present the underlying principles and modes for delivering left ventricular pacing, as well as to highlight advantages of preferential over monoventricular configuration. Finally, current clinical evidence, following implementation of automated algorithms, regarding performance of left ventricular as compared with biventricular pacing will be discussed. It is expected that the field of preferential left ventricular pacing will grow significantly over the following years, and its combination with other advanced pacing modalities may promote clinical status and prognosis of patients with advanced dyssynchronous heart failure.
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Beer D, Dandamudi G, Mandrola JM, Friedman PA, Vijayaraman P. His-bundle pacing: impact of social media. Europace 2019; 21:1445-1450. [DOI: 10.1093/europace/euz169] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Dominik Beer
- Geisinger Heart Institute, Geisinger Commonwealth School of Medicine, MC 36-10, 1000 E Mountain Blvd, Wilkes-Barre, PA, USA
| | - Gopi Dandamudi
- Department of Cardiology, CHI-Franciscan, Tacoma, WA, USA
| | - John M Mandrola
- Department of Cardiology, Baptist Health Louisville, Louisville, KY, USA
| | | | - Pugazhendhi Vijayaraman
- Geisinger Heart Institute, Geisinger Commonwealth School of Medicine, MC 36-10, 1000 E Mountain Blvd, Wilkes-Barre, PA, USA
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Liosis S, Lyan E, Abdin A, Brüggemann B, Lange SA, Vogler J, Heeger CH, Yalin K, Tilz RR, Eitel C. Biventricular Pacing Going Along with Acute Hemodynamic Response in a Patient with Huge Anterior Wall Aneurysm - Importance of Pacing Viable Myocardium. AMERICAN JOURNAL OF CASE REPORTS 2019; 20:810-815. [PMID: 31177265 PMCID: PMC6581013 DOI: 10.12659/ajcr.914480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Patient: Female, 85 Final Diagnosis: Ischemic cardiomyopathy with electrical storm Symptoms: Dyspnea Medication: — Clinical Procedure: Ablation of ventricular tachycardia Specialty: Cardiology
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Affiliation(s)
- Spyridon Liosis
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Evgeny Lyan
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Amr Abdin
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Ben Brüggemann
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Stefan A Lange
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Julia Vogler
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Christian H Heeger
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Kivanc Yalin
- Department of Cardiology, Usak University, Faculty of Medicine, Usak, Turkey
| | - Roland R Tilz
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
| | - Charlotte Eitel
- Department of Cardiology, University Heart Center Lübeck, Lübeck, Germany
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Leclercq C, Burri H, Curnis A, Delnoy PP, Rinaldi CA, Sperzel J, Lee K, Calò L, Vicentini A, Concha JF, Thibault B. Cardiac resynchronization therapy non-responder to responder conversion rate in the more response to cardiac resynchronization therapy with MultiPoint Pacing (MORE-CRT MPP) study: results from Phase I. Eur Heart J 2019; 40:2979-2987. [DOI: 10.1093/eurheartj/ehz109] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/26/2018] [Accepted: 02/16/2019] [Indexed: 11/13/2022] Open
Abstract
Abstract
Aims
To assess the impact of MultiPoint™ Pacing (MPP)—programmed according to the physician’s discretion—in non-responders to standard biventricular pacing after 6 months.
Methods and results
The study enrolled 1921 patients receiving a quadripolar cardiac resynchronization therapy (CRT) system capable of MPP™ therapy. A core laboratory assessed echocardiography at baseline and 6 months and defined volumetric non-response to biventricular pacing as <15% reduction in left ventricular end-systolic volume (LVESV). Clinical sites randomized patients classified as non-responders in a 1:1 ratio to receive MPP (236 patients) or continued biventricular pacing (231 patients) for an additional 6 months and evaluated rate of conversion to echocardiographic response. Baseline characteristics of both groups were comparable. No difference was observed in non-responder to responder conversion rate between MPP and biventricular pacing (31.8% and 33.8%, P = 0.72). In the MPP arm, 68 (29%) patients received MPP programmed with a wide LV electrode anatomical separation (≥30 mm) and shortest LV1–LV2 and LV2–RV timing delays (MPP-AS); 168 (71%) patients received MPP programmed with other settings (MPP-Other). MPP-AS elicited a significantly higher non-responder conversion rate compared to MPP-Other (45.6% vs. 26.2%, P = 0.006) and a trend in a higher conversion rate compared to biventricular pacing (45.6% vs. 33.8%, P = 0.10).
Conclusions
After 6 months, investigator-discretionary MPP programming did not significantly increase echocardiographic response compared to biventricular pacing in CRT non-responders.
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Ventricular septal pacing: Optimum method to position the lead. Indian Heart J 2018; 70:713-720. [PMID: 30392512 PMCID: PMC6204444 DOI: 10.1016/j.ihj.2018.01.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 12/18/2017] [Accepted: 01/10/2018] [Indexed: 12/02/2022] Open
Abstract
Adverse hemodynamics of right ventricular (RV) pacing is known for years. Several studies have revealed that adverse outcomes of RV apical pacing are directly linked to cumulative percentage of ventricular pacing. Algorithms to minimize ventricular pacing are only effective if there is good atrioventricular (AV) conduction. A need for an alternate site for ventricular pacing is evident in patients with high presumed ventricular pacing burden. Most studied alternate site for ventricular pacing is ventricular septum (outflow tract septum and mid-septum). Conventionally septal position of the ventricular pacing lead is confirmed by fluoroscopic appearance of the lead and characteristics electrocardiographic (ECG) features. However, several recent studies have challenged these fluoroscopic and ECG features as to be inadequate. So, there is need for a systematic approach for septal positioning of the ventricular lead.
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Hill AC, Silka MJ, Bar-Cohen Y. Cardiac Resynchronization Therapy in Pediatrics. J Innov Card Rhythm Manag 2018; 9:3256-3264. [PMID: 32477817 PMCID: PMC7252792 DOI: 10.19102/icrm.2018.090804] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 12/27/2017] [Indexed: 12/24/2022] Open
Abstract
Cardiac resynchronization therapy (CRT) has proven to be a powerful and effective tool in the treatment of adults with severe dilated or ischemic cardiomyopathy. A substantial portion of the adult heart failure population has severely depressed systolic function, heart failure symptoms, QRS prolongation, and left bundle branch block. Indications for CRT in adults are commonly focused on these characteristics. However, pediatric patients represent a heterogeneous group with many etiologies of heart failure and anatomic variants, with most of them not fitting the typical adult CRT criteria. The heterogeneity of the pediatric population has hindered the identification of ideal candidates for CRT, but initial experience with CRT in various groups of pediatric patients has been encouraging. This article reviews indications for and outcomes of CRT in pediatric and congenital heart disease patients.
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Affiliation(s)
- Allison C Hill
- Division of Cardiology, Children's Hospital Los Angeles, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Michael J Silka
- Division of Cardiology, Children's Hospital Los Angeles, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Yaniv Bar-Cohen
- Division of Cardiology, Children's Hospital Los Angeles, Los Angeles, CA, USA.,Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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Sieniewicz BJ, Gould J, Porter B, Sidhu BS, Behar JM, Claridge S, Niederer S, Rinaldi CA. Optimal site selection and image fusion guidance technology to facilitate cardiac resynchronization therapy. Expert Rev Med Devices 2018; 15:555-570. [PMID: 30019954 PMCID: PMC6178093 DOI: 10.1080/17434440.2018.1502084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/12/2018] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Cardiac resynchronization therapy (CRT) has emerged as one of the few effective treatments for heart failure. However, up to 50% of patients derive no benefit. Suboptimal left ventricle (LV) lead position is a potential cause of poor outcomes while targeted lead deployment has been associated with enhanced response rates. Image-fusion guidance systems represent a novel approach to CRT delivery, allowing physicians to both accurately track and target a specific location during LV lead deployment. AREAS COVERED This review will provide a comprehensive evaluation of how to define the optimal pacing site. We will evaluate the evidence for delivering targeted LV stimulation at sites displaying favorable viability or advantageous mechanical or electrical properties. Finally, we will evaluate several emerging image-fusion guidance systems which aim to facilitate optimal site selection during CRT. EXPERT COMMENTARY Targeted LV lead deployment is associated with reductions in morbidity and mortality. Assessment of tissue characterization and electrical latency are critical and can be achieved in a number of ways. Ultimately, the constraints of coronary sinus anatomy have forced the exploration of novel means of delivering CRT including endocardial pacing which hold promise for the future of CRT delivery.
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Affiliation(s)
- Benjamin J. Sieniewicz
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Justin Gould
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Bradley Porter
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Baldeep S Sidhu
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Jonathan M Behar
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Simon Claridge
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - Steve Niederer
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
| | - Christopher A. Rinaldi
- Division of Imaging Sciences and Biomedical Engineering, King’s College London, London, United Kingdom
- Cardiology Department, Guys and St Thomas’ NHS Foundation Trust, London, United Kingdom
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Multicenter Randomized Controlled Crossover Trial Comparing Hemodynamic Optimization Against Echocardiographic Optimization of AV and VV Delay of Cardiac Resynchronization Therapy: The BRAVO Trial. JACC Cardiovasc Imaging 2018; 12:1407-1416. [PMID: 29778861 PMCID: PMC6682561 DOI: 10.1016/j.jcmg.2018.02.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 02/09/2018] [Accepted: 02/15/2018] [Indexed: 01/01/2023]
Abstract
OBJECTIVES BRAVO (British Randomized Controlled Trial of AV and VV Optimization) is a multicenter, randomized, crossover, noninferiority trial comparing echocardiographic optimization of atrioventricular (AV) and interventricular delay with a noninvasive blood pressure method. BACKGROUND Cardiac resynchronization therapy including AV delay optimization confers clinical benefit, but the optimization requires time and expertise to perform. METHODS This study randomized patients to echocardiographic optimization or hemodynamic optimization using multiple-replicate beat-by-beat noninvasive blood pressure at baseline; after 6 months, participants were crossed over to the other optimization arm of the trial. The primary outcome was exercise capacity, quantified as peak exercise oxygen uptake. Secondary outcome measures were echocardiographic left ventricular (LV) remodeling, quality-of-life scores, and N-terminal pro-B-type natriuretic peptide. RESULTS A total of 401 patients were enrolled, the median age was 69 years, 78% of patients were men, and the New York Heart Association functional class was II in 84% and III in 16%. The primary endpoint, peak oxygen uptake, met the criterion for noninferiority (pnoninferiority = 0.0001), with no significant difference between the hemodynamically optimized arm and echocardiographically optimized arm of the trial (mean difference 0.1 ml/kg/min). Secondary endpoints for noninferiority were also met for symptoms (mean difference in Minnesota score 1; pnoninferiority = 0.002) and hormonal changes (mean change in N-terminal pro-B-type natriuretic peptide -10 pg/ml; pnoninferiority = 0.002). There was no significant difference in LV size (mean change in LV systolic dimension 1 mm; pnoninferiority < 0.001; LV diastolic dimension 0 mm; pnoninferiority <0.001). In 30% of patients the AV delay identified as optimal was more than 20 ms from the nominal setting of 120 ms. CONCLUSIONS Optimization of cardiac resynchronization therapy devices by using noninvasive blood pressure is noninferior to echocardiographic optimization. Therefore, noninvasive hemodynamic optimization is an acceptable alternative that has the potential to be automated and thus more easily implemented. (British Randomized Controlled Trial of AV and VV Optimization [BRAVO]; NCT01258829).
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'Optimized' LV only pacing using a dual chamber pacemaker as a cost effective alternative to CRT. Indian Pacing Electrophysiol J 2017; 17:72-77. [PMID: 29073000 PMCID: PMC5478914 DOI: 10.1016/j.ipej.2017.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 11/23/2022] Open
Abstract
Background Cardiac Resynchronization therapy (CRT) remains largely under-used in developing countries owing to the high cost of therapy. In this pilot study, we explore ‘optimized’ Left Ventricle Only Pacing (LVOP) as a cost effective alternative to cardiac resynchronization therapy in selected patients with heart failure. Hypothesis In economically poorer patients with heart failure, left bundle branch block (LBBB) and intact AV node conduction, synchronization can be obtained using a dual chamber pacemaker (leads in right atrium and Left ventricle) with the help of 2D strain imaging. Methods and results 4 patients underwent LVOP for symptomatic heart failure. Post procedure ‘optimization’ was done using 12 lead electrocardiography and 2D- Strain imaging. Difference between Time to Peak longitudinal strain and Aortic valve Closure (Diff TPL-AC) was calculated for each segment at different AV delays and the AV delay with the smallest Diff TPL-AC was programmed. The mean AV delay that resulted in electrical and mechanical synchrony was 150 ms. After a mean follow up of 6 months, all patients had improved by at least 1 NYHA class. The mean reduction in QRS duration post procedure was −54.5 ± 22.82 ms and the mean improvement in EF was 7 ± 2.75%. Conclusion Optimized LVOP using 2D strain and ECG can be a cost-effective alternative to CRT in patients with LBBB, heart failure and normal AV node conduction.
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Skaf S, Thibault B, Khairy P, O'Meara E, Fortier A, Vakulenko HV, Pitre C, White M, Ducharme A. Impact of Left Ventricular vs Biventricular Pacing on Reverse Remodelling: Insights From the Evaluation of Resynchronization Therapy for Heart Failure (EARTH) Trial. Can J Cardiol 2017; 33:1274-1282. [DOI: 10.1016/j.cjca.2017.07.478] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 07/17/2017] [Accepted: 07/19/2017] [Indexed: 10/19/2022] Open
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Yamasaki H, Lustgarten D, Cerkvenik J, Birnie D, Gasparini M, Lee KLF, Sekiguchi Y, Varma N, Lemke B, Starling RC, Aonuma K. Adaptive CRT in patients with normal AV conduction and left bundle branch block: Does QRS duration matter? Int J Cardiol 2017; 240:297-301. [PMID: 28416247 DOI: 10.1016/j.ijcard.2017.04.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 04/06/2017] [Accepted: 04/10/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND Adaptive cardiac resynchronization therapy (aCRT) is a dynamic optimization algorithm which paces only the left ventricle (LV) when atrio-ventricular (AV) conduction is normal, thus reducing right ventricular (RV) pacing. However, the impact of QRS duration on aCRT efficacy remains uncertain. We examined whether QRS duration impacts aCRT effectiveness in patients with left bundle branch block (LBBB) and preserved AV conduction. METHODS Randomized patients in the Adaptive CRT trial, which enrolled NYHA III/IV patients, were used in this analysis. Patients were randomized to receive aCRT or echo-optimized bi-ventricular CRT (control arm). Endpoints for this analysis were clinical composite score (CCS) at 6months post-implant and time to first heart failure (HF) hospitalization or death. RESULTS Among the 199 patients with LBBB and normal AV intervals at baseline, 80 patients (40%) had a baseline moderately wide QRS of 120-150ms. In this subgroup, a greater proportion of aCRT patients had an improved CCS (79% vs. 50%) at 6months compared to the control group (p=0.03). There was also a trend toward a lower risk of death or HF hospitalization (hazard ratio: 0.53; 95% CI: 0.24-1.15; p=0.10) in the moderately wide QRS subgroup with aCRT compared to the control arm. In the wide QRS subgroup, the efficacy was comparable in both treatment arms. CONCLUSION Adaptive CRT was associated with improved patient outcomes over echo-optimized bi-ventricular CRT in patients with preserved AV conduction, LBBB, and moderately wide QRS. The adaptive cardiac resynchronization therapy trial (ClinicalTrials.gov Identifier: NCT00980057) was sponsored by Medtronic plc, Mounds View, MN.
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Affiliation(s)
- Hiro Yamasaki
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.
| | - Daniel Lustgarten
- The University of Vermont Medical Center, Burlington, Vermont, United States
| | | | - David Birnie
- University of Ottawa Heart Institute, Ottawa, Ontario, Canada
| | | | | | - Yukio Sekiguchi
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Niraj Varma
- The Cleveland Clinic, Cleveland, OH, United States
| | - Bernd Lemke
- Department of Cardiology, Hospital Lüdenscheid, Lüdenscheid, Germany
| | | | - Kazutaka Aonuma
- Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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Witt CM, Lenz CJ, Shih HH, Ebrille E, Rosenbaum AN, van Zyl M, Aung H, Manocha KK, Deshmukh AJ, Hodge DO, Mulpuru SK, Cha YM, Espinosa RE, Asirvatham SJ, Mcleod CJ. Right ventricular pacemaker lead position is associated with differences in long-term outcomes and complications. J Cardiovasc Electrophysiol 2017; 28:924-930. [PMID: 28543771 DOI: 10.1111/jce.13256] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/27/2017] [Accepted: 05/15/2017] [Indexed: 01/07/2023]
Abstract
INTRODUCTION Cardiac pacing from the right ventricular apex is associated with detrimental long-term effects and nonapical pacing locations may be associated with improved outcomes. There is little data regarding complications with nonapical lead positions. The aim of this study was to assess long-term outcomes and lead-related complications associated with differing ventricular lead tip position. METHODS AND RESULTS All adult patients who underwent dual-chamber pacemaker implantation from 2004 to 2014 were included if they had postprocedure chest radiographs amenable to lead position determination. Long-term outcomes and lead-related complication rates were recorded. These were compared at 5 years between: (1) apical and septal leads, (2) apical and nonseptal nonapical (NSNA), and (3) apical and septal with >40% ventricular pacing. We retrospectively evaluated 3,450 patients, which included 238 with a septal position and 733 with NSNA lead positions. Septal lead position was associated with a lower mortality compared to apical leads (24% vs. 31%, P = 0.02). In patients with greater than 40% pacing, septal leads were associated with significantly higher rates of incident atrial fibrillation compared to apical leads (49% vs. 34%, P = 0.04). NSNA positions were associated with a significantly higher rate of lead dislodgement (4% vs. 2%, P = 0.005) and need for revision (8% vs. 5%, P = 0.005). CONCLUSIONS Septal pacemaker lead position is associated with a lower mortality compared to apically placed leads, but a higher incidence of atrial fibrillation with higher percentage ventricular pacing. NSNA lead locations are associated with more complications and should be avoided.
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Affiliation(s)
| | | | | | | | | | | | - Htin Aung
- Department of Cardiovascular Diseases
| | | | | | - David O Hodge
- Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota, USA
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Understanding pacing postconditioning-mediated cardiac protection: a role of oxidative stress and a synergistic effect of adenosine. J Physiol Biochem 2016; 73:175-185. [PMID: 27864790 DOI: 10.1007/s13105-016-0535-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 10/24/2016] [Indexed: 12/13/2022]
Abstract
We and others have demonstrated a protective role for pacing postconditioning (PPC) against ischemia/reperfusion (I/R) injury in the heart; however, the underlying mechanisms behind these protective effects are not completely understood. In this study, we wanted to further characterize PPC-mediated cardiac protection, specifically identify optimal pacing sites; examine the role of oxidative stress; and test the existence of a potential synergistic effect between PPC and adenosine. Isolated rat hearts were subjected to coronary occlusion followed by reperfusion. PPC involved three, 30 s, episodes of alternating left ventricular (LV) and right atrial (RA) pacing. Multiple pacing protocols with different pacing electrode locations were used. To test the involvement of oxidative stress, target-specific agonists or antagonists were infused at the beginning of reperfusion. Hemodynamic data were digitally recorded, and cardiac enzymes, oxidant, and antioxidant status were chemically measured. Pacing at the LV or RV but not at the heart apex or base significantly (P < 0.001) protected against ischemia-reperfusion injury. PPC-mediated protection was completely abrogated in the presence of reactive oxygen species (ROS) scavenger, ebselen; peroxynitrite (ONOO-) scavenger, uric acid; and nitric oxide synthase inhibitor, L-NAME. Nitric oxide (NO) donor, snap, however significantly (P < 0.05) protected the heart against I/R injury in the absence of PPC. The protective effects of PPC were significantly improved by adenosine. PPC-stimulated protection can be achieved by alternating LV and RA pacing applied at the beginning of reperfusion. NO, ROS, and the product of their interaction ONOO- play a significant role in PPC-induced cardiac protection. Finally, the protective effects of PPC can be synergized with adenosine.
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Matthaios I, Kaladaridou A, Skaltsiotes E, Agrios J, Antoniou A, Georgiopoulos G, Papadopoulou E, Pamboucas C, Toumanidis S. Acute Haemodynamic and Echocardiographic Effects of Multiple Configurations of Left Ventricular Pacing Sites in Acute Myocardial Infarction: Experimental Study. Heart Lung Circ 2016; 26:383-394. [PMID: 27670586 DOI: 10.1016/j.hlc.2016.07.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 07/25/2016] [Accepted: 07/29/2016] [Indexed: 11/24/2022]
Abstract
BACKGROUND Left ventricular (LV) pacing is unsuccessful in a significant number of patients, mainly due to sub-optimal LV pacing location. Nevertheless, data about the impact of different pacing sites on LV function in ischaemic myocardium are scarce. The purpose of this study was to investigate the effect of combinations of alternative LV pacing sites on LV mechanics after experimental acute anterior myocardial infarction (AMI), in order to define the optimal configuration. METHODS Atrioventricular epicardial pacing at alternative pacing sites was performed in 16 healthy pigs simultaneously, after experimental AMI. Standard right ventricular (RV) apical pacing was combined with: i) LV apex lateral wall; ii) LV basal posterior wall; iii) LV basal anterior wall, and; iv) LV basal anterior wall + LV basal posterior wall. Moreover the pacing configurations of, v) LV basal posterior wall + LV apex lateral wall; vi) LV basal posterior wall + LV basal anterior wall, and; vii) LV basal anterior wall + LV apex lateral wall were also investigated. Haemodynamic parameters, together with classic and novel echocardiographic indices were used, to evaluate the effect of each pacing combination. A speckle tracking technique using EchoPAC software was used. RESULTS After AMI, the pacing combination of LV apex lateral wall and LV basal posterior wall had the most favourable effect on LV function, leading to similar haemodynamic and torsional effects with sinus rhythm (all variables p>0.05). CONCLUSIONS In pig hearts after AMI, the combination of pacing LV apex lateral wall and LV basal posterior wall managed to maintain the LV function at a level comparable to the sinus rhythm.
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Affiliation(s)
- I Matthaios
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece.
| | - A Kaladaridou
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - E Skaltsiotes
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - J Agrios
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - A Antoniou
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - G Georgiopoulos
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - E Papadopoulou
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - C Pamboucas
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
| | - S Toumanidis
- Department of Clinical Therapeutics, Medical School, National and Kapodistrian University of Athens, "Alexandra" Hospital, Athens, Greece
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Bristow MR, Saxon LA, Feldman AM, Mei C, Anderson SA, DeMets DL. Lessons Learned and Insights Gained in the Design, Analysis, and Outcomes of the COMPANION Trial. JACC-HEART FAILURE 2016; 4:521-535. [PMID: 27289408 DOI: 10.1016/j.jchf.2016.02.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 02/18/2016] [Accepted: 02/23/2016] [Indexed: 11/17/2022]
Abstract
COMPANION (Comparison of Medical Therapy, Pacing and Defibrillation in Heart Failure), the first cardiac resynchronization therapy (CRT)-heart failure mortality and morbidity controlled clinical trial planned, conducted, and reported, was a randomized, 3-arm study that compared CRT delivered by a biventricular pacemaker (CRT-P) or a CRT defibrillator device (CRT-D) with optimal pharmacological therapy alone. The patient population had advanced chronic heart failure with QRS interval prolongation ≥120 ms and reduced left ventricular ejection fraction (heart failure with reduced ejection fraction). COMPANION had a composite hospitalization and mortality endpoint as the primary outcome measure but was also powered for mortality as the first secondary endpoint. The conduct of COMPANION was challenged by important issues that arose during the trial, the most important of which was U.S. Food and Drug Administration approval of CRT devices. Along with other challenges, this issue was appropriately dealt with by the Steering Committee and the Data and Safety Monitoring Committee and did not negatively affect trial results or conclusions. The authors report here updated analyses from the study, which are consistent with previously published results indicating that CRT-P or CRT-D has favorable effects on heart failure morbidity and mortality in a patient population "precision" selected by the surrogate marker of increased QRS interval duration. New analyses indicate that increasing the number of classes of neurohormonal inhibitor concurrent therapy has a positive effect on CRT mortality reduction. Hypothesis-generating new findings are that in patients receiving beta-blocker therapy, the mortality reduction advantage of CRT-D versus CRT-P may be minimized or eliminated and that there may be adverse effects of CRT-D defibrillator shocks on pump failure-related outcomes.
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Affiliation(s)
| | - Leslie A Saxon
- University of Southern California, Los Angeles, California
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Sohaib SMA, Wright I, Lim E, Moore P, Lim PB, Koawing M, Lefroy DC, Lusgarten D, Linton NWF, Davies DW, Peters NS, Kanagaratnam P, Francis DP, Whinnett ZI. Atrioventricular Optimized Direct His Bundle Pacing Improves Acute Hemodynamic Function in Patients With Heart Failure and PR Interval Prolongation Without Left Bundle Branch Block. JACC Clin Electrophysiol 2015; 1:582-591. [PMID: 29759412 DOI: 10.1016/j.jacep.2015.08.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 08/27/2015] [Indexed: 11/15/2022]
Abstract
OBJECTIVES The purpose of this study was to investigate whether heart failure patients with narrow QRS duration (or right bundle branch block) but with long PR interval gain acute hemodynamic benefit from atrioventricular (AV) optimization. We tested this with biventricular pacing and (to deliver pure AV shortening) direct His bundle pacing. BACKGROUND Benefits of pacing for heart failure have previously been indicated by acute hemodynamic studies and verified in outcome studies. A new target for pacing in heart failure may be PR interval prolongation, which is associated with 58% higher mortality regardless of QRS duration. METHODS We enrolled 16 consecutive patients with systolic heart failure, PR interval prolongation (mean, 254 ± 62 ms) and narrow QRS duration (n = 13; mean QRS duration: 119 ± 17 ms) or right bundle branch block (n = 3; mean, QRS duration: 156 ± 18 ms). We successfully delivered temporary direct His bundle pacing in 14 patients and temporary biventricular pacing in 14 participants. We performed AV optimization using invasive systolic blood pressure obtaining parabolic responses (mean R2: 0.90 for His, and 0.85 for biventricular pacing). RESULTS The mean increment in systolic BP compared with intrinsic ventricular conduction was 4.1 mm Hg (95% confidence interval [CI]: +1.9 to +6.2 mm Hg for His and 4.3 mm Hg [95% CI: +2.0 to +6.5 mm Hg] for biventricular pacing. QRS duration lengthened with biventricular pacing (change = +22 ms [95% CI: +18 to +25 ms]) but not with His pacing (change = +0.5 ms [95% CI: -2.6 to +3.6 ms). CONCLUSIONS AV-optimized pacing improves acute hemodynamic function in patients with heart failure and long PR interval without left bundle branch block. That it can be achieved by single-site His pacing shows that its mechanism is AV shortening. The improvement is ∼60% of the effect size previously reported for biventricular pacing in left bundle branch block. Randomized, blinded trials are warranted to test for long-term beneficial effects.
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Affiliation(s)
- S M Afzal Sohaib
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - Ian Wright
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Elaine Lim
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Philip Moore
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - P Boon Lim
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Michael Koawing
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - David C Lefroy
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Daniel Lusgarten
- Department of Medicine, University of Vermont College of Medicine, Burlington, Vermont
| | - Nick W F Linton
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - D Wyn Davies
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Nicholas S Peters
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - Prapa Kanagaratnam
- Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
| | - Darrel P Francis
- National Heart & Lung Institute, Imperial College London, London, United Kingdom.
| | - Zachary I Whinnett
- National Heart & Lung Institute, Imperial College London, London, United Kingdom; Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
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20
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Gonzalez JE, Sauer WH. Generator exchange in a primary prevention cardiac resynchronziation responder: do you reimplant a defibrillator? Card Electrophysiol Clin 2015; 7:487-96. [PMID: 26304529 DOI: 10.1016/j.ccep.2015.05.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This case-based review discusses the benefits of cardiac resynchronization therapy (CRT) and whether defibrillation function is necessary in CRT responders. An evaluation of the literature and evidence to date is discussed. Recommendations based on these data, expert opinion, and recently published appropriate use criteria are given.
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Affiliation(s)
- Jaime E Gonzalez
- Division of Cardiology, University of Colorado School of Medicine, Aurora, CO, USA
| | - William H Sauer
- Division of Cardiology, University of Colorado School of Medicine, Aurora, CO, USA.
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Li H, Lichter JG, Seidel T, Tomaselli GF, Bridge JHB, Sachse FB. Cardiac Resynchronization Therapy Reduces Subcellular Heterogeneity of Ryanodine Receptors, T-Tubules, and Ca2+ Sparks Produced by Dyssynchronous Heart Failure. Circ Heart Fail 2015; 8:1105-14. [PMID: 26294422 DOI: 10.1161/circheartfailure.115.002352] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 08/17/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND Cardiac resynchronization therapy (CRT) is a major advance for treatment of patients with dyssynchronous heart failure (DHF). However, our understanding of DHF-associated remodeling of subcellular structure and function and their restoration after CRT remains incomplete. METHODS AND RESULTS We investigated subcellular heterogeneity of remodeling of structures and proteins associated with excitation-contraction coupling in cardiomyocytes in DHF and after CRT. Three-dimensional confocal microscopy revealed subcellular heterogeneity of ryanodine receptor (RyR) density and the transverse tubular system (t-system) in a canine model of DHF. RyR density at the ends of lateral left ventricular cardiomyocytes was higher than that in cell centers, whereas the t-system was depleted at cell ends. In anterior left ventricular cardiomyocytes, however, we found a similar degree of heterogeneous RyR remodeling, despite preserved t-system. Synchronous heart failure was associated with marginal heterogeneity of RyR density. We used rapid scanning confocal microscopy to investigate effects of heterogeneous structural remodeling on calcium signaling. In DHF, diastolic Ca(2+) spark density was smaller at cell ends versus centers. After CRT, subcellular heterogeneity of structures and function was reduced. CONCLUSIONS RyR density exhibits remarkable subcellular heterogeneity in DHF. RyR remodeling occurred in lateral and anterior cardiomyocytes, but remodeling of t-system was confined to lateral myocytes. These findings indicate that different mechanisms underlie remodeling of RyRs and t-system. Furthermore, we suggest that ventricular dyssynchrony exacerbates subcellular remodeling in heart failure. CRT efficiently reduced subcellular heterogeneity. These results will help to explain remodeling of excitation-contraction coupling in disease and restoration after CRT.
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Affiliation(s)
- Hui Li
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.)
| | - Justin G Lichter
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.)
| | - Thomas Seidel
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.)
| | - Gordon F Tomaselli
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.)
| | - John H B Bridge
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.)
| | - Frank B Sachse
- From the Nora Eccles Harrison Cardiovascular Research and Training Institute (H.L., J.G.L., T.S., J.H.B., F.B.S.), and Department of Bioengineering (J.G.L., F.B.S.), University of Utah, Salt Lake City; and Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.F.T.).
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Schiller O, Dham N, Greene EA, Heath DM, Alexander ME, Berul CI. Pediatric Dilated Cardiomyopathy Patients Do Not Meet Traditional Cardiac Resynchronization Criteria. J Cardiovasc Electrophysiol 2015; 26:885-889. [PMID: 25884372 DOI: 10.1111/jce.12690] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 03/09/2015] [Accepted: 04/13/2015] [Indexed: 01/10/2023]
Abstract
INTRODUCTION Cardiac resynchronization therapy (CRT) is an effective device-based intervention for adults with heart failure (HF) with specific indications, based on large, multicenter randomized clinical trials. The criteria for CRT in adult HF include significant symptoms, ventricular systolic dysfunction, prolonged QRS duration, and left bundle branch block (LBBB) pattern on electrocardiogram (ECG). Despite having less data, CRT is also being widely utilized in children with HF. The shortage of evidence-based CRT criteria in pediatrics prompted us to review a cohort of children with dilated cardiomyopathy and evaluate their potential eligibility for CRT using the traditional adult criteria. METHODS Single-center data of all pediatric patients with dilated cardiomyopathy were extracted from the heart failure registry and retrospectively reviewed. Patients who had at least 2 separate visits that included HF scoring, electrocardiogram, and echocardiogram were included. Patients who were ventricular paced were excluded. RESULTS Data for 52 patients meeting inclusion criteria were analyzed. The mean ejection fraction was 25% on the first clinical evaluation and 27% on the second visit. No patient and 2 patients met the adult criteria for prolonged QRS on the first and second encounters, respectively. No patients had an LBBB pattern on ECG. CONCLUSIONS None of the pediatric HF patients in our study met the published Class I criteria for CRT device therapy in adults. These findings suggest that extrapolation of adult HF data to pediatrics is not sufficient for CRT criteria. Specific guidelines for device implantation in children must be based on scientific investigation including pediatric clinical trials.
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Affiliation(s)
- Ofer Schiller
- Division of Cardiology, Children's National Medical Center and the Department of Pediatrics, George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Niti Dham
- Division of Cardiology, Children's National Medical Center and the Department of Pediatrics, George Washington University School of Medicine, Washington, District of Columbia, USA
| | - E Anne Greene
- Division of Cardiology, Children's National Medical Center and the Department of Pediatrics, George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Deneen M Heath
- Division of Cardiology, Children's National Medical Center and the Department of Pediatrics, George Washington University School of Medicine, Washington, District of Columbia, USA
| | - Mark E Alexander
- Department of Cardiology, Boston Children's Hospital and the Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA
| | - Charles I Berul
- Division of Cardiology, Children's National Medical Center and the Department of Pediatrics, George Washington University School of Medicine, Washington, District of Columbia, USA
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Wang YC, Yu CC, Chiu FC, Splett V, Klepfer R, Hilpisch K, Tsai CT, Lai LP, Hwang JJ, Lin JL. Acute Effects of Biventricular Pacing in Heart Failure Patients with a Normal Ejection Fraction and Mechanical Dyssynchrony. Cardiology 2015; 130:112-9. [DOI: 10.1159/000368795] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 09/30/2014] [Indexed: 11/19/2022]
Abstract
Objectives: We tested the acute effects of resynchronization in heart failure patients with a normal (>50%) left ventricular (LV) ejection fraction (HFNEF) and mechanical dyssynchrony. Methods: Twenty-four HFNEF patients (72 ± 6 years, 5 male) with mechanical dyssynchrony (standard deviation of electromechanical time delay among 12 LV segments >35 ms) were studied with temporary pacing catheters in the right atrium, LV, and right ventricle (RV), and high-fidelity catheters for pressure recording. Using selected atrioventricular (AV) intervals of 60, 90, 120, 150, and 180 ms to optimize transmitral flow during simultaneous biventricular pacing, the RV-LV (VV) interval was then evaluated at RV30, RV15, 0, LV15, LV30, and LV45 (RV or LV indicates which ventricle was paced first, the number indicates by how many ms). Results: During simultaneous pacing, longer AV intervals were associated with improved LV pressure-derivative minimums and increased aortic pressures (p < 0.05 vs. normal sinus rhythm). In the VV interval from RV30 to LV45, there was a graded increase in the aortic velocity time integral and a decrease in dyssynchrony during simultaneous or LV-first pacing (p < 0.05 vs. normal sinus rhythm). Conclusions: For HFNEF patients with mechanical dyssynchrony, acute simultaneous biventricular or LV-first pacing with longer AV intervals reduced mechanical dyssynchrony and improved diastolic and systolic hemodynamics.
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Bogaev RC, Meyers DE. Medical Treatment of Heart Failure and Coronary Heart Disease. Coron Artery Dis 2015. [DOI: 10.1007/978-1-4471-2828-1_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Naegeli B, Brunner-La Rocca HP, Attenhofer Jost C, Fah-Gunz A, Maurer D, Bertel O, Scharf C. Clinical Long-Term Response to Cardiac Resynchronization Therapy Is Independent of Persisting Echocardiographic Markers of Dyssynchrony. Cardiol Res 2014; 5:163-170. [PMID: 28352448 PMCID: PMC5358264 DOI: 10.14740/cr368w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2014] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND The aim of the study was to prove the concept that correction of established parameters of dyssynchrony is a requirement for favorable long-term outcome in patients with cardiac resynchronization therapy (CRT), whereas patients with persisting dyssynchrony should have a less favorable response. METHODS After CRT implantation and optimization of dyssynchrony parameters, we evaluated whether correction or persistence of dyssynchrony predicted long-term outcome. Primary endpoint was a combination of cardiac mortality/heart transplantation and hospitalization due to worsening heart failure, and secondary endpoint was NYHA class. RESULTS One hundred twenty-eight consecutive patients (mean age 68 ± 10 years) undergoing CRT with a mean left ventricular ejection fraction of 27±9% were followed for 27 ± 19 months. All cause mortality was 17.2%, cardiac mortality was 7.8% and 3.1% had to undergo heart transplantation. Rehospitalization due to worsening heart failure was observed in 14.8%. NYHA class before CRT implantation was 2.8 ± 0.8 and improved during follow-up to 2.0 ± 0.8 (P < 0.001). A clinical response was observed in 76% (n = 97) and an echocardiographic response was documented in 66% (n = 85). After individually optimized AV and VV intervals with echocardiography, atrioventricular dyssynchrony was still present in 7.2%, interventricular dyssynchrony in 13.3% and intraventricular dyssynchrony in 16.4%. Despite persistent atrioventricular, interventricular and intraventricular dyssynchrony at long-term follow-up, the combined primary and secondary endpoints did not differ compared to the group without mechanical dyssynchrony (P = ns). QRS duration with biventricular stimulation did not differ between responders vs. nonresponders. CONCLUSION After successful CRT implantation, clinical long-term response is independent of correction of dyssynchrony measured by echocardiographic parameters and QRS width.
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Affiliation(s)
- Barbara Naegeli
- HerzGefassZentrum, Klinik Im Park, Seestrasse 247, CH-8027 Zurich, Switzerland
| | - Hans-Peter Brunner-La Rocca
- Department of Cardiology, Maastricht University Medical Centre, PO Box 5800, NL-6202 AZ Maastricht, The Netherlands
| | | | - Anja Fah-Gunz
- HerzGefassZentrum, Klinik Im Park, Seestrasse 247, CH-8027 Zurich, Switzerland
| | - Dominik Maurer
- HerzGefassZentrum, Klinik Im Park, Seestrasse 247, CH-8027 Zurich, Switzerland
| | - Osmund Bertel
- HerzGefassZentrum, Klinik Im Park, Seestrasse 247, CH-8027 Zurich, Switzerland
| | - Christoph Scharf
- HerzGefassZentrum, Klinik Im Park, Seestrasse 247, CH-8027 Zurich, Switzerland
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Gopi A, Sundar G, Yelagudri S, Lalukota K, Sridevi C, Narasimhan C. Atrial synchronous left ventricular only pacing with VDD pacemaker system - a cost effective alternative to conventional cardiac resynchronization therapy. Indian Heart J 2014; 66:612-6. [PMID: 25634394 PMCID: PMC4311010 DOI: 10.1016/j.ihj.2014.10.398] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 10/09/2014] [Indexed: 11/20/2022] Open
Abstract
INTRODUCTION Atrial synchronous left ventricular (LV) only pacing using two leads and VDD pacemaker could be a cost effective alternative to conventional cardiac resynchronization therapy (CRT). METHODS We implanted right atrial (RA) and LV leads with VDD pulse generator (LV only pacing) in five carefully screened heart failure patients who could not afford conventional CRT. All had NYHA class III/IV symptoms despite maximal guideline directed medical therapy. The sensed atrioventricular delay was programmed to pre-excite the LV and achieve fusion beat. Response to treatment was assessed at 6 months. RESULTS Four patients were males. The mean age was 58 ± 12 years. At follow up, there was improvement in electrocardiographic, and echocardiographic parameters: Mean QRS duration decreased from 174 ± 17 msec to 128 ± 10.9 msec (p = 0.009), LV end-diastolic diameter decreased from 73.2 ± 12 mm to 65.8 ± 9.6 mm (p = 0.026), LV end-systolic diameter decreased from 65 ± 12 mm to 54 ± 10 mm (p = 0.020). There was a trend towards reduction of LV end-systolic and end-diastolic volumes. LV ejection fraction improved from 25 ± 6% to 34 ± 6% (p = 0.013) and left atrial dimension reduced from 44 ± 4 mm to 39 ± 5 mm (p = 0.045). All patients improved clinically. CONCLUSION RA-LV pacing using VDD pacemaker is a safe and effective technique of CRT. This may be a cost effective alternative to conventional CRT for patients in developing countries.
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Affiliation(s)
- Arun Gopi
- CARE Hospital, Road No. 1, Banjara Hills, Hyderabad 34, India
| | - Gomathi Sundar
- CARE Hospital, Road No. 1, Banjara Hills, Hyderabad 34, India
| | | | | | - C Sridevi
- CARE Hospital, Road No. 1, Banjara Hills, Hyderabad 34, India
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Derval N, Bordachar P, Lim HS, Sacher F, Ploux S, Laborderie J, Steendijk P, Deplagne A, Ritter P, Garrigue S, Denis A, Hocini M, Haissaguerre M, Clementy J, Jaïs P. Impact of pacing site on QRS duration and its relationship to hemodynamic response in cardiac resynchronization therapy for congestive heart failure. J Cardiovasc Electrophysiol 2014; 25:1012-1020. [PMID: 24891271 DOI: 10.1111/jce.12464] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 04/14/2014] [Accepted: 04/17/2014] [Indexed: 12/01/2022]
Abstract
INTRODUCTION Recent studies have demonstrated that left ventricular (LV) pacing site is a critical parameter in optimizing cardiac resynchronization therapy (CRT). The present study evaluates the effect of pacing from different LV locations on QRS duration (QRSd) and their relationship to acute hemodynamic response in congestive heart failure patients. METHODS AND RESULTS Thirty-five patients with nonischemic dilated cardiomyopathy and left bundle branch block referred for CRT device implantation were studied. Eleven predetermined LV pacing sites were systematically assessed in random order: epicardial: coronary sinus (CS); endocardial: basal and mid-cavity (septal, anterior, lateral, and inferior), apex, and the endocardial site facing the CS pacing site. For each patient QRSd and +dP/dtmax during baseline (AAI) and DDD LV pacing at 2 atrioventricular delays were compared. Response to CRT was significantly better in patients with wider baseline QRSd (≥150 milliseconds). Hemodynamic response was inversely correlated to increase of QRSd during LV pacing (short atrioventricular [AV] delay: r = 0.44, P < 0.001; long AV delay: r = 0.59, P < 0.001). Compared to baseline, LV pacing at the site of shortest QRSd significantly improved +dP/dtmax (+18 ± 25%, P < 0.001) but was not superior to other conventional strategy (lateral wall, CS pacing, and echo-guided) and was inferior to a hemodynamically guided strategy. CONCLUSIONS In our study, we have demonstrated that changes of QRSd during LV pacing correlated with acute hemodynamic response and that LV pacing location was a primary determinant of paced QRSd. Although QRSd did not predict the maximum hemodynamic response, our results confirm the link between electrical activation and hemodynamic response of the LV during CRT.
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Affiliation(s)
- Nicolas Derval
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Pierre Bordachar
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Han S Lim
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Frederic Sacher
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Sylvain Ploux
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | | | - Paul Steendijk
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Antoine Deplagne
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Philippe Ritter
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | | | - Arnaud Denis
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Mélèze Hocini
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | | | - Jacques Clementy
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
| | - Pierre Jaïs
- Hopital Cardiologique du Haut Lévêque, CHU Bordeaux, Pessac, France
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Efficacy of isolated left ventricular and biventricular pacing is differentially associated with baseline QRS duration in chronic heart failure: a meta-analysis of randomized controlled trials. Heart Fail Rev 2014; 20:81-8. [PMID: 24957909 DOI: 10.1007/s10741-014-9448-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Cardiac resynchronization therapy can treat chronic heart failure through either biventricular pacing (BVP) or isolated left ventricular pacing (LVP), and the efficacy is depended on QRS duration. However, the optimal therapeutic choice of pacing or how the QRS influences the efficacy remains uncertain. To investigate this uncertainty, we searched available publications in PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials databases regarding differentials in efficacy parameters between BVP and LVP. A meta-analysis of eight randomized controlled trials found that BVP and LVP were comparable with regard to quality-of-life scores, left ventricular ejection fraction, left ventricular end-systolic volume, and mortality or heart transplant rates. However, there was a significant heterogeneity among the trials in 6-min walking distances. Subsequent meta-regression indicated that the baseline QRS duration significantly correlated with the standard mean difference between BVP and LVP. As QRS duration increased, the gain in 6-min walking distance with BVP became significantly greater than that of LVP. This suggests that it is necessary to consider the QRS duration when comparing the clinical effects of BVP and LVP.
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Design of an Acute dP/dt Hemodynamic Measurement Protocol to Isolate Cardiac Effect of Pacing. J Card Fail 2014; 20:365-72. [DOI: 10.1016/j.cardfail.2014.01.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 01/23/2014] [Accepted: 01/31/2014] [Indexed: 11/17/2022]
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Whinnett ZI, Sohaib SMA, Jones S, Kyriacou A, March K, Coady E, Mayet J, Hughes AD, Frenneaux M, Francis DP. British randomised controlled trial of AV and VV optimization ("BRAVO") study: rationale, design, and endpoints. BMC Cardiovasc Disord 2014; 14:42. [PMID: 24693953 PMCID: PMC3992145 DOI: 10.1186/1471-2261-14-42] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 03/21/2014] [Indexed: 11/25/2022] Open
Abstract
Background Echocardiographic optimization of pacemaker settings is the current standard of care for patients treated with cardiac resynchronization therapy. However, the process requires considerable time of expert staff. The BRAVO study is a non-inferiority trial comparing echocardiographic optimization of atrioventricular (AV) and interventricular (VV) delay with an alternative method using non-invasive blood pressure monitoring that can be automated to consume less staff resources. Methods/Design BRAVO is a multi-centre, randomized, cross-over, non-inferiority trial of 400 patients with a previously implanted cardiac resynchronization device. Patients are randomly allocated to six months in each arm. In the echocardiographic arm, AV delay is optimized using the iterative method and VV delay by maximizing LVOT VTI. In the haemodynamic arm AV and VV delay are optimized using non-invasive blood pressure measured using finger photoplethysmography. At the end of each six month arm, patients undergo the primary outcome measure of objective exercise capacity, quantified as peak oxygen uptake (VO2) on a cardiopulmonary exercise test. Secondary outcome measures are echocardiographic measurement of left ventricular remodelling, quality of life score and N-terminal pro B-type Natriuretic Peptide (NT-pro BNP). The study is scheduled to complete recruitment in December 2013 and to complete follow up in December 2014. Discussion If exercise capacity is non-inferior with haemodynamic optimization compared with echocardiographic optimization, it would be proof of concept that haemodynamic optimization is an acceptable alternative which has the potential to be more easily implemented. Trial registration Clinicaltrials.gov NCT01258829
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Affiliation(s)
- Zachary I Whinnett
- International Centre for Circulatory Health, National Heart and Lung Institute, Imperial College London, 59-61 North Wharf Road, London W2 1LA, UK.
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Holzmeister J, Gorcsan J, Ruschitzka F. Cardiac-resynchronization therapy in heart failure with a narrow QRS complex. N Engl J Med 2014; 370:579-80. [PMID: 24499223 DOI: 10.1056/nejmc1315288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Left ventricular pacing site in cardiac resynchronization therapy: Clinical follow-up and predictors of failed lateral implant. Eur J Heart Fail 2014; 10:421-7. [PMID: 18395673 DOI: 10.1016/j.ejheart.2008.02.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 12/22/2007] [Accepted: 02/28/2008] [Indexed: 11/23/2022] Open
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El-Menyar AA, Abdou SM. Impact of left bundle branch block and activation pattern on the heart. Expert Rev Cardiovasc Ther 2014; 6:843-57. [DOI: 10.1586/14779072.6.6.843] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Abstract
Biventricular pacing has been an exciting recent advance in the management of drug-refractory heart failure. This new therapy has evolved as much from necessity as scientific observation, since benefits derived from pharmacotherapy currently appear to have reached their peak. Clinical trials of biventricular pacing are establishing morbidity and mortality benefits in heart failure. New challenges in the use of these pacemakers are now arising. These include the accurate diagnosis of ventricular dyssynchrony and, hence, potential responders to the refinement of implantation of the left ventricular lead to the appropriate dyssynchronous ventricular area and optimization of pacemaker programming. This review gives a general overview of the principles and the current evidence for the use of biventricular pacemakers in the treatment of heart failure. In addition, a discussion of current research and future projects is included.
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Affiliation(s)
- Paul A Gould
- Wynn Department of Metabolic Cardiology, Baker Heart Research Institute, PO Box 6492, Melbourne, Victoria 8008, Australia.
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35
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Dubin AM, Berul CI. Electrophysiological interventions for treatment of congestive heart failure in pediatrics and congenital heart disease. Expert Rev Cardiovasc Ther 2014; 5:111-8. [PMID: 17187462 DOI: 10.1586/14779072.5.1.111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Heart failure therapy, while well tested in the adult population, therapeutic interventions are less well defined in the pediatric population. Several treatment strategies are available for the adult patient with heart failure, thought few of these therapies have been proven in children. Morbidity and mortality in the pediatric population with a failing heart is significant, and rhythm management as well as strategies to improve hemodynamics are important in the care of these children. This review will address issues of rhythm management and resynchronization therapy in pediatric and congenital heart disease patients with heart failure.
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Affiliation(s)
- Anne M Dubin
- Stanford University, 750 Welch Rd., Suite 305, Palo Alto, CA 94304, USA.
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36
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Wongcharoen W, Chen SA. Management of atrial fibrillation in patients with heart failure: from drug therapy to ablation. Expert Rev Cardiovasc Ther 2014; 7:311-22. [DOI: 10.1586/14779072.7.3.311] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ploux S, Strik M, van Hunnik A, van Middendorp L, Kuiper M, Prinzen FW. Acute electrical and hemodynamic effects of multisite left ventricular pacing for cardiac resynchronization therapy in the dyssynchronous canine heart. Heart Rhythm 2013; 11:119-25. [PMID: 24120876 DOI: 10.1016/j.hrthm.2013.10.018] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Accepted: 10/01/2013] [Indexed: 01/08/2023]
Abstract
BACKGROUND Multisite left ventricular (multi-LV) epicardial pacing has been proposed as an alternative to conventional single-site LV (single-LV) pacing to increase the efficacy of cardiac resynchronization therapy. OBJECTIVE To compare the effects of multi-LV versus single-LV pacing in dogs with left bundle branch block (LBBB). METHODS Studies were performed in 9 anaesthetized dogs with chronic LBBB using 7 LV epicardial electrodes. Each electrode was tested alone and in combination with 1, 2, 3, and 6 other electrodes, the sequence of which was chosen on the basis of practical real-time electrical mapping to determine the site of the latest activation. LV total activation time (LVTAT) and dispersion of repolarization (DRep) were measured by using approximately 100 electrodes around the ventricles. LV contractility was assessed as the maximum derivative of left ventricular pressure (LVdP/dtmax ). RESULTS Single-LV pacing provided, on average, a -4.0% ± 9.3% change in LVTAT and 0.2% ± 13.7% change in DRep. Multi-LV pacing markedly decreased both LVTAT and DRep in a stepwise fashion to reach -41.3% ± 5% (P < .001 for overall comparison) and -14.2% ± 19.5% (P < .02 for overall comparison) in the septuple-LV pacing configuration, respectively. Single-LV pacing provided a mean increase of 10.7% ± 7.7% in LVdP/dtmax. LVdP/dtmax incrementally increased by the addition of pacing electrodes to 16.4% ± 8.7% (P < .001 for overall comparison). High response to single-LV pacing could not be improved further during multi-LV pacing. CONCLUSIONS Compared with single-LV pacing, multi-LV pacing can considerably reduce both LVTAT and DRep in dogs with LBBB, but the improvement in contractility is limited to conditions where single-LV pacing provides suboptimal improvement. Further studies are warranted to determine whether these acute effects translate in antiarrhythmic properties and better long-term outcomes.
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Affiliation(s)
- Sylvain Ploux
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands; Hôpital de Haut-Lévêque, CHU de Bordeaux, Pessac, France; L'Institut de Rythmologie et modélisation Cardiaque, Université de Bordeaux Segalen, Bordeaux, France.
| | - Marc Strik
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Arne van Hunnik
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Lars van Middendorp
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Marion Kuiper
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Frits W Prinzen
- Department of Physiology, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
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Lumens J, Ploux S, Strik M, Gorcsan J, Cochet H, Derval N, Strom M, Ramanathan C, Ritter P, Haïssaguerre M, Jaïs P, Arts T, Delhaas T, Prinzen FW, Bordachar P. Comparative electromechanical and hemodynamic effects of left ventricular and biventricular pacing in dyssynchronous heart failure: electrical resynchronization versus left-right ventricular interaction. J Am Coll Cardiol 2013; 62:2395-2403. [PMID: 24013057 DOI: 10.1016/j.jacc.2013.08.715] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 07/11/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVES The purpose of this study was to enhance understanding of the working mechanism of cardiac resynchronization therapy by comparing animal experimental, clinical, and computational data on the hemodynamic and electromechanical consequences of left ventricular pacing (LVP) and biventricular pacing (BiVP). BACKGROUND It is unclear why LVP and BiVP have comparative positive effects on hemodynamic function of patients with dyssynchronous heart failure. METHODS Hemodynamic response to LVP and BiVP (% change in maximal rate of left ventricular pressure rise [LVdP/dtmax]) was measured in 6 dogs and 24 patients with heart failure and left bundle branch block followed by computer simulations of local myofiber mechanics during LVP and BiVP in the failing heart with left bundle branch block. Pacing-induced changes of electrical activation were measured in dogs using contact mapping and in patients using a noninvasive multielectrode electrocardiographic mapping technique. RESULTS LVP and BiVP similarly increased LVdP/dtmax in dogs and in patients, but only BiVP significantly decreased electrical dyssynchrony. In the simulations, LVP and BiVP increased total ventricular myofiber work to the same extent. While the LVP-induced increase was entirely due to enhanced right ventricular (RV) myofiber work, the BiVP-induced increase was due to enhanced myofiber work of both the left ventricle (LV) and RV. Overall, LVdP/dtmax correlated better with total ventricular myofiber work than with LV or RV myofiber work alone. CONCLUSIONS Animal experimental, clinical, and computational data support the similarity of hemodynamic response to LVP and BiVP, despite differences in electrical dyssynchrony. The simulations provide the novel insight that, through ventricular interaction, the RV myocardium importantly contributes to the improvement in LV pump function induced by cardiac resynchronization therapy.
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Affiliation(s)
- Joost Lumens
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France; Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands.
| | - Sylvain Ploux
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France; Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Marc Strik
- Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - John Gorcsan
- University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Hubert Cochet
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
| | - Nicolas Derval
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
| | | | | | - Philippe Ritter
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
| | - Michel Haïssaguerre
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
| | - Pierre Jaïs
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
| | - Theo Arts
- Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Tammo Delhaas
- Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Frits W Prinzen
- Maastricht University Medical Center, Cardiovascular Research Institute Maastricht (CARIM), Maastricht, the Netherlands
| | - Pierre Bordachar
- Hôpital Cardiologique du Haut-Lévêque, CHU Bordeaux, L'Institut de rythmologie et modélisation cardiaque (LIRYC), Université Bordeaux, Bordeaux, France
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Birnie D, Lemke B, Aonuma K, Krum H, Lee KLF, Gasparini M, Starling RC, Milasinovic G, Gorcsan J, Houmsse M, Abeyratne A, Sambelashvili A, Martin DO. Clinical outcomes with synchronized left ventricular pacing: analysis of the adaptive CRT trial. Heart Rhythm 2013; 10:1368-74. [PMID: 23851059 DOI: 10.1016/j.hrthm.2013.07.007] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Indexed: 01/14/2023]
Abstract
BACKGROUND Acute studies have suggested that left ventricular pacing (LVP) may have benefits over biventricular pacing (BVP). The adaptive cardiac resynchronization therapy (aCRT) algorithm provides LVP synchronized to produce fusion with the intrinsic activation when the intrinsic atrioventricular (AV) interval is normal. The randomized double-blind adaptive cardiac resynchronization therapy trial demonstrated noninferiority of the aCRT algorithm compared to echocardiography-optimized BVP (control). OBJECTIVE To examine whether synchronized LVP (sLVP) resulted in better clinical outcomes. METHODS First, stratification by percent sLVP (%sLVP) and multivariate Cox proportional hazards model was used to assess the relationship between %sLVP and clinical outcomes. Second, outcomes were compared between patients in the aCRT arm (n = 318) and control patients (n = 160) stratified by intrinsic AV interval at randomization. RESULTS In the aCRT arm, %sLVP ≥50% (n = 142) was independently associated with a decreased risk of death or heart failure hospitalization (hazard ratio 0.49; 95% confidence interval 0.28-0.85; P = .012) compared with %sLVP <50% (n = 172). A greater proportion of patients with %sLVP ≥50% improved in Packer's clinical composite score at 6-month (82% vs. 68%; P = .002) and 12-month (80% vs. 62%; P = .0006) follow-ups compared to controls. In the subgroup with normal AV (n = 241), there was a lower risk of death or heart failure hospitalization (hazard ratio 0.52; 95% confidence interval 0.27-0.98; P = .044) with the aCRT algorithm. A greater proportion of patients in the aCRT arm improved in the clinical composite score at 6-month (81% vs. 69%; P = .041) and 12-month (77% vs. 66%; P = .076) follow-ups compared to controls. CONCLUSIONS Higher %sLVP was independently associated with superior clinical outcomes. In patients with normal AV conduction, the aCRT algorithm provided mostly sLVP and demonstrated better clinical outcomes compared to echocardiography-optimized BVP.
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Affiliation(s)
- David Birnie
- University of Ottawa Heart Institute, Ottawa, Ontario, Canada.
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Aiba T, Barth AS, Hesketh GG, Hashambhoy YL, Chakir K, Tunin RS, Greenstein JL, Winslow RL, Kass DA, Tomaselli GF. Cardiac resynchronization therapy improves altered Na channel gating in canine model of dyssynchronous heart failure. Circ Arrhythm Electrophysiol 2013; 6:546-54. [PMID: 23650309 DOI: 10.1161/circep.113.000400] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Slowed Na⁺ current (INa) decay and enhanced late INa (INa-L) prolong the action potential duration (APD) and contribute to early afterdepolarizations. Cardiac resynchronization therapy (CRT) shortens APD compared with dyssynchronous heart failure (DHF); however, the role of altered Na⁺ channel gating in CRT remains unexplored. METHODS AND RESULTS Adult dogs underwent left-bundle branch ablation and right atrial pacing (200 beats/min) for 6 weeks (DHF) or 3 weeks followed by 3 weeks of biventricular pacing at the same rate (CRT). INa and INa-L were measured in left ventricular myocytes from nonfailing, DHF, and CRT dogs. DHF shifted voltage-dependence of INa availability by -3 mV compared with nonfailing, enhanced intermediate inactivation, and slowed recovery from inactivation. CRT reversed the DHF-induced voltage shift of availability, partially reversed enhanced intermediate inactivation but did not affect DHF-induced slowed recovery. DHF markedly increased INa-L compared with nonfailing. CRT dramatically reduced DHF-induced enhanced INa-L, abbreviated the APD, and suppressed early afterdepolarizations. CRT was associated with a global reduction in phosphorylated Ca²⁺/Calmodulin protein kinase II, which has distinct effects on inactivation of cardiac Na⁺ channels. In a canine AP model, alterations of INa-L are sufficient to reproduce the effects on APD observed in DHF and CRT myocytes. CONCLUSIONS CRT improves DHF-induced alterations of Na⁺ channel function, especially suppression of INa-L, thus, abbreviating the APD and reducing the frequency of early afterdepolarizations. Changes in the levels of phosphorylated Ca²⁺/Calmodulin protein kinase II suggest a molecular pathway for regulation of INa by biventricular pacing of the failing heart.
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Affiliation(s)
- Takeshi Aiba
- Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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41
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Acute hemodynamic benefits of biventricular and single-site systemic ventricular pacing in patients with a systemic right ventricle. Heart Rhythm 2013; 10:676-82. [DOI: 10.1016/j.hrthm.2013.01.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Indexed: 11/20/2022]
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Thibault B, Dubuc M, Khairy P, Guerra PG, Macle L, Rivard L, Roy D, Talajic M, Karst E, Ryu K, Paiement P, Farazi TG. Acute haemodynamic comparison of multisite and biventricular pacing with a quadripolar left ventricular lead. ACTA ACUST UNITED AC 2013; 15:984-91. [DOI: 10.1093/europace/eus435] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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SHOME JOY, SILBERBAUER JOHN, RINALDI ALDO, KAMALVAND KAYVAN. Single Site Left Ventricular Pacing induced Dyssynchrony and Cardiomyopathy. Pacing Clin Electrophysiol 2013; 36:e35-7. [DOI: 10.1111/j.1540-8159.2010.03021.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 10/10/2010] [Accepted: 11/03/2010] [Indexed: 11/29/2022]
Affiliation(s)
- JOY SHOME
- Department of Cardiology, William Harvey Hospital; East Kent NHS Trust; Ashford; UK
| | - JOHN SILBERBAUER
- Department of Cardiology, William Harvey Hospital; East Kent NHS Trust; Ashford; UK
| | - ALDO RINALDI
- St. Thomas’ Hospital; Guy's and St. Thomas’ NHS Trust; London; UK
| | - KAYVAN KAMALVAND
- Department of Cardiology, William Harvey Hospital; East Kent NHS Trust; Ashford; UK
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Tracy CM, Epstein AE, Darbar D, DiMarco JP, Dunbar SB, Estes NAM, Ferguson TB, Hammill SC, Karasik PE, Link MS, Marine JE, Schoenfeld MH, Shanker AJ, Silka MJ, Stevenson LW, Stevenson WG, Varosy PD, Epstein AE, DiMarco JP, Ellenbogen KA, Estes NAM, Freedman RA, Gettes LS, Gillinov AM, Gregoratos G, Hammill SC, Hayes DL, Hlatky MA, Newby LK, Page RL, Schoenfeld MH, Silka MJ, Stevenson LW, Sweeney MO, Anderson JL, Jacobs AK, Halperin JL, Albert NM, Creager MA, DeMets D, Ettinger SM, Guyton RA, Hochman JS, Kushner FG, Ohman EM, Stevenson W, Yancy CW. 2012 ACCF/AHA/HRS focused update of the 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. J Thorac Cardiovasc Surg 2013; 144:e127-45. [PMID: 23140976 DOI: 10.1016/j.jtcvs.2012.08.032] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Epstein AE, DiMarco JP, Ellenbogen KA, Estes NAM, Freedman RA, Gettes LS, Gillinov AM, Gregoratos G, Hammill SC, Hayes DL, Hlatky MA, Newby LK, Page RL, Schoenfeld MH, Silka MJ, Stevenson LW, Sweeney MO, Tracy CM, Epstein AE, Darbar D, DiMarco JP, Dunbar SB, Estes NAM, Ferguson TB, Hammill SC, Karasik PE, Link MS, Marine JE, Schoenfeld MH, Shanker AJ, Silka MJ, Stevenson LW, Stevenson WG, Varosy PD. 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol 2012; 61:e6-75. [PMID: 23265327 DOI: 10.1016/j.jacc.2012.11.007] [Citation(s) in RCA: 552] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Shetty AK, Duckett SG, Ginks MR, Ma Y, Sohal M, Bostock J, Kapetanakis S, Singh JP, Rhode K, Wright M, O'Neill MD, Gill JS, Carr-White G, Razavi R, Rinaldi CA. 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. Eur Heart J Cardiovasc Imaging 2012; 14:692-9. [PMID: 23175695 DOI: 10.1093/ehjci/jes270] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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/dtmax 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.
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Affiliation(s)
- Anoop K Shetty
- Department of Imaging Sciences, Rayne Institute, Kings College London, London, UK
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Takeuchi D, Tomizawa Y. Pacing device therapy in infants and children: a review. J Artif Organs 2012; 16:23-33. [PMID: 23104398 DOI: 10.1007/s10047-012-0668-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 10/10/2012] [Indexed: 01/20/2023]
Abstract
The number of pediatric pacemakers implanted is still relatively small. Children requiring pacing therapy have characteristics that are distinct from those of adults, including physical size, somatic growth, and cardiac anomalies. Considering these features, long-term follow-up of pediatric pacemaker implantation is necessary. Selection of appropriate generators, pacing modes, pacing sites, and leads is important. Generally, epicardial leads are commonly used in small infants. On the other hand, the use of endocardial leads in children is increasing worldwide because of their benefits over epicardial leads, such as minimal invasiveness, lower pacing threshold, and longer generator longevity. Endocardial leads are not suitable for patients with intracardiac shunts because of the high risk of systemic thrombosis. Venous occlusion is another significant problem with endocardial leads. With the increase in the number of pacing device implantations, the incidence of infection from such devices is also increasing. Complete device removal is sometimes recommended to treat device infection, but experience in the removal of endocardial leads in children is still scarce. This article gives an overview of pacing therapy in the pediatric population, including discussions on new pacing systems, such as remote monitoring systems, magnetic imaging compliant pacemaker systems, and leadless pacing devices.
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Affiliation(s)
- Daiji Takeuchi
- Department of Pediatric Cardiology, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan.
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García-Bengochea JB, Fernández AL, Calvelo DS, Escudero JA, Gude F, Juanatey JRG. Temporary epicardial left ventricular and biventricular pacing improves cardiac output after cardiopulmonary bypass. J Cardiothorac Surg 2012; 7:113. [PMID: 23088393 PMCID: PMC3539891 DOI: 10.1186/1749-8090-7-113] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Accepted: 09/17/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To evaluate, with different pacing modes, acute changes in left ventricular systolic function, obtained by continuous cardiac output thermodilution in various subsets of patients undergoing cardiopulmonary bypass surgery. Increments of mean arterial pressure and cardiac output were considered the end point. METHODS Fifty cases electively submitted to cardiac surgery were analyzed. Isolated valve surgery 62%, coronary revascularization 30% and 8% mixed disease. Left ventricular ejection fraction was preserved in 50%,36% had moderate depression,(EF 36%-50%) whereas 14% had severe depression (EF < 35%). Left bundle branch block occurred in 18%. Preoperatively 84% were in sinus rhythm and 16% in atrial fibrillation. The different subgroups were analyzed for comparisons. Right atrial-right ventricular and right atrial-left ventricular pacing were employed in sinus rhytm. Biventricular pacing was also used in atrial fibrillation. RESULTS Right atrium-right ventricular pacing, decreased significantly mean arterial pressure and cardiac output (2.3%) in the overall population and in the subgroups studied. Right atrium-left ventricle, increased mean arterial pressure and cardiac output in 79% of patients and yielded cardiac output increments of 7.5% (0.40 l/m) in the low ejection fraction subgroup and 7.3% (0.43 l/m) in the left bundle branch block subset. In atrial fibrillation patients, left ventricular and biventricular pacing produced a significant increase in cardiac output 8.5% (0.39 l/min) and 11.6% (0.53 l/min) respectively. The dP/dt max increased significantly with both modes (p = 0.021,p = 0.028). CONCLUSION Right atrial-right ventricular pacing generated adverse hemodynamic effects. Right atrium-left ventricular pacing produced significant CO improvement particularly in cases with depressed ventricular function and left bundle branch block. The greatest increments were observed with left ventricular or biventricular pacing in atrial fibrillation with depressed ejection fraction.
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Affiliation(s)
- Jose B García-Bengochea
- Cardiac Surgical Division, Department of Surgery, Hospital Clínico Universitario, 15706, Santiago de Compostela, Spain.
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Lakkireddy D, Di Biase L, Ryschon K, Biria M, Swarup V, Reddy YM, Verma A, Bommana S, Burkhardt D, Dendi R, Dello Russo A, Casella M, Carbucicchio C, Tondo C, Dawn B, Natale A. Radiofrequency Ablation of Premature Ventricular Ectopy Improves the Efficacy of Cardiac Resynchronization Therapy in Nonresponders. J Am Coll Cardiol 2012; 60:1531-9. [DOI: 10.1016/j.jacc.2012.06.035] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 06/13/2012] [Accepted: 06/26/2012] [Indexed: 10/27/2022]
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Tracy CM, Epstein AE, Darbar D, Dimarco JP, Dunbar SB, Estes NAM, Ferguson TB, Hammill SC, Karasik PE, Link MS, Marine JE, Schoenfeld MH, Shanker AJ, Silka MJ, Stevenson LW, Stevenson WG, Varosy PD. 2012 ACCF/AHA/HRS Focused Update of the 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Heart Rhythm 2012; 9:1737-53. [PMID: 22975672 DOI: 10.1016/j.hrthm.2012.08.021] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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