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Abuelazm M, Mohamed I, Seri AR, Almaadawy O, Abdelazeem B, Brašić JR. Contact Force-Guided versus Contact Force-Blinded Cavo-Tricuspid Isthmus Ablation for Atrial Flutter: A Systematic Review and Meta-Analysis. Diseases 2023; 11:98. [PMID: 37489450 PMCID: PMC10366732 DOI: 10.3390/diseases11030098] [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: 06/17/2023] [Revised: 07/16/2023] [Accepted: 07/16/2023] [Indexed: 07/26/2023] Open
Abstract
Contact force (CF) is a novel approach developed to increase the safety and efficacy of catheter ablation. However, the value of CF-sensing technology for atrial flutter (AFL) cavo-tricuspid isthmus ablation (CTIA) is inconclusive. To generate a comprehensive assessment of optimal extant data on CF for AFL, we synthesized randomized controlled trials (RCTs) and observational studies from Web of Science, SCOPUS, EMBASE, PubMed, and Cochrane until 29 November 2022, using the odds ratio (OR) for dichotomous outcomes and mean difference (MD) for continuous outcomes with a corresponding 95% confidence interval (CI). Two RCTs and three observational studies with a total of 376 patients were included in our analysis. CF-guided ablation was associated with (A) a higher rate of AFL recurrence (OR: 2.26 with 95% CI [1.05, 4.87]) and total CF (MD: 2.71 with 95% CI [1.28, 4.13]); (B) no effect on total procedure duration (MD: -2.88 with 95% CI [-7.48, 1.72]), fluoroscopy duration (MD: -0.96 with 95% CI [-2.24, 0.31]), and bidirectional isthmus block (BDIB) (OR: 1.50 with 95% CI [0.72, 3.11]); and (C) decreased radiofrequency (RF) duration (MD: -1.40 with 95% CI [-2.39, -0.41]). We conclude that although CF-guided CTIA was associated with increased AFL recurrence and total CF and reduced RF duration, it did not affect total procedure duration, fluoroscopy duration, or BDIB. Thus, CF-guided CTIA may not be the optimal intervention for AFL. These findings indicate the need for (A) providers to balance the benefits and risks of CF when utilizing precision medicine to develop treatment plans for individuals with AFL and (B) clinical trials investigating CF-guided catheter ablation for AFL to provide definitive evidence of optimal CF-sensing technology.
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Affiliation(s)
| | - Islam Mohamed
- Department of Internal Medicine, University of Missouri, Kansas City, MO 64108, USA
| | - Amith Reddy Seri
- Department of Internal Medicine, McLaren Health Care, Flint, MI 48532, USA
- Department of Internal Medicine, Michigan State University, East Lansing, MI 48823, USA
| | - Omar Almaadawy
- Department of Internal Medicine, MedStar Health, Baltimore Internal Medicine Residency Program, Baltimore, MD 21218, USA
| | - Basel Abdelazeem
- Department of Internal Medicine, McLaren Health Care, Flint, MI 48532, USA
- Department of Internal Medicine, Michigan State University, East Lansing, MI 48823, USA
| | - James Robert Brašić
- Section of High-Resolution Brain Positron Emission Tomography Imaging, Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Department of Psychiatry, New York City Health and Hospitals/Bellevue, New York, NY 10016, USA
- Department of Psychiatry, New York University Grossman School of Medicine, New York University Langone Health, New York, NY 10016, USA
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Backhoff D, Müller MJ, Betz T, Arnold A, Schneider H, Paul T, Krause U. Contact Force Guided Radiofrequency Current Application at Developing Myocardium: Summary and Conclusions. J Cardiovasc Electrophysiol 2022; 33:1757-1766. [PMID: 35578015 DOI: 10.1111/jce.15544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 03/20/2022] [Accepted: 03/27/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Catheter contact is one key determinant for lesion size in radiofrequency catheter ablation (RFA). Monitoring of contact force (CF) during RFA has been shown to improve efficacy of RFA in experimental settings as well as in adult patients. Coronary artery narrowing after RFA has been described in experimental settings as well as in children and adults and may be dependent from catheter contact. Value of CF monitoring concerning these issues has not been systematically yet. OBJECTIVE Value of high versus low CF during RFA in piglets was studied to assess lesion size and potential coronary artery involvement mimicking RFA in small children. ANIMALS AND METHODS RFA with continuous CF monitoring was performed in 24 piglets (median weight 18.5 kg) using a 7F TactiCath Quartz RF ablation catheter (Abbott, Illinois, USA). A total of 7 lesions were induced in each animal applying low (10-20 g) or high (40-60 g) CF. RF energy was delivered with a target temperature of 65 °C at 30 W for 30 seconds. Coronary angiography was performed prior and immediately after RF application. Animals were assigned to repeat coronary angiography followed by heart removal after 48 h (n=12) or 6 months (n=12). Lesions with surrounding myocardium were excised, fixated and stained. Lesion volumes were measured by microscopic planimetry. RESULTS A total of 148 RF lesions were identified in the explanted hearts. Only in the subset of lesions at the AV annulus 6 month after ablation, lesion size and number of lesions exhibiting transmural extension were higher in the high CF group compared to low CF. In all other locations CF had no impact on lesion size and mural extension after 48 h as well as after 6 months. Additional parameters as Lesion Size Index and Force Time Integral were also not related to lesion size. Coronary artery damage was present in 2 animals after 48 h and in 1 after 6 months and was not related to CF. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- David Backhoff
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Matthias J Müller
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Teresa Betz
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Andreas Arnold
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Heike Schneider
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Thomas Paul
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
| | - Ulrich Krause
- Department of Pediatric Cardiology and Intensive Care Medicine, Georg August University Medical Center, Göttingen, Germany
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Kotake Y, Kanawati J, Kumar S. Will the insulated-tip radiofrequency catheter transform ablation procedures? J Cardiovasc Electrophysiol 2022; 33:1157-1159. [PMID: 35322476 DOI: 10.1111/jce.15463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 11/29/2022]
Abstract
Radiofrequency (RF) ablation has been the most widely employed energy source for catheter ablation to date. However, most of conventional RF ablation energy dissipates into the bloodstream before reaching the target tissue. Technology that conveys RF energy exclusively toward target tissue may potentially improve the quality, safety, and outcome of the RF ablation procedures. RF ablation using a novel insulated-tip catheter (SMT, Sirona Medical Technologies, Windsor, CT) may refine RF ablation in the future to minimize the risk of iatrogenic complications. Although it is still unclear whether the results of the SMT catheter can be translated to a human beating heart, the data for SMT catheter of this study are very promising. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yasuhito Kotake
- Department of Cardiology, Westmead Hospital, NSW, Australia.,Westmead Applied Research Centre, University of Sydney
| | - Juliana Kanawati
- Department of Cardiology, Westmead Hospital, NSW, Australia.,Westmead Applied Research Centre, University of Sydney
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, NSW, Australia.,Westmead Applied Research Centre, University of Sydney
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Impact of catheter-tissue contact force on lesion size during right ventricular outflow tract ablation in a swine model. Chin Med J (Engl) 2020; 133:1680-1687. [PMID: 32496308 PMCID: PMC7401743 DOI: 10.1097/cm9.0000000000000859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Background The catheter-tissue contact force (CF) is one of the significant determinants of lesion size and thus has a considerable impact on the effectiveness of ablation procedures. This study aimed to evaluate the impact of CF on the lesion size during right ventricular outflow tract (RVOT) ablation in a swine model. Methods Twelve Guangxi Bama miniature male pigs weighing 40 to 50 kg were studied. After general anesthesia, a ThermoCool SmartTouch contact-sensing ablation catheter was introduced to the RVOT via the femoral vein under the guidance of the CARTO 3 system. The local ventricular voltage amplitude and impedance were measured using different CF levels. We randomly divided the animals into the following four groups according to the different CF levels: group A (3–9 g); group B (10–19 g); group C (20–29 g); and group D (30–39 g). Radiofrequency ablations were performed at three points in the free wall and septum of the RVOT in power control mode at 30 W for 30 s while maintaining the saline irrigation rate at 17 mL/min. At the end of the procedures, the maximum depth, surface diameter, and lesion volume were measured and recorded. A linear regression analysis was performed to determine the relationship between continuous variables. Results A total of 72 ablation lesions were created in the RVOT of the 12 Bama pigs. The maximum depth, surface diameter, and volume of the lesions measured were well correlated with the CF (free wall: β = 0.105, β = 0.162, β = 3.355, respectively, P < 0.001; septum: β = 0.093, β = 0.150, β = 3.712, respectively, P < 0.001). The regional ventricular bipolar voltage amplitude, unipolar voltage amplitude, and impedance were weakly positively associated with the CF (β = 0.065, β = 0.125, and β = 1.054, respectively, P < 0.001). There was a significant difference in the incidence of steam pops among groups A, B, C, and D (free wall: F = 7.3, P = 0.032; septum: F = 10.5, P = 0.009); and steam pops occurred only when the CF exceeded 20 g. Trans-mural lesions were observed when the CF exceeded 10 g in the free wall, while the lesions in the septum were non-trans-mural even though the CF reached 30 g. Conclusions CF seems to be a leading predictive factor for the size of formed lesions in RVOT ablation. Maintaining the CF value between 3 and 10 g may be reasonable and effective for creating the necessary lesion size and reducing the risk of complications, such as steam pops and perforations.
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Giehm-Reese M, Kronborg MB, Lukac P, Kristiansen SB, Jensen HK, Gerdes C, Kristensen J, Nielsen JM, Nielsen JC. A randomized trial of contact force in atrial flutter ablation. Europace 2020; 22:947-955. [DOI: 10.1093/europace/euaa049] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 02/07/2020] [Indexed: 12/19/2022] Open
Abstract
Abstract
Aims
Contact force (CF) sensing has emerged as a tool to guide and improve outcomes for catheter ablation (CA) for cardiac arrhythmias. The clinical benefit on patient outcomes remains unknown. To study whether CF-guided CA for typical atrial flutter (AFL) is superior to CA not guided by CF.
Methods and results
In a double-blinded controlled superiority trial, we randomized patients 1:1 to receive CA for typical AFL guided by CF (intervention group) or blinded to CF (control group). In the intervention group, a specific value of the lesion size index (LSI), estimating ablation lesions size was targeted for each ablation lesion. Patients underwent electrophysiological study (EPS) after 3 months to assess occurrence of the primary endpoint of re-conduction across the cavo-tricuspid isthmus (CTI). We included 156 patients with typical AFL, median age was 68 [interquartile range (IQR) 61–74] years and 120 (77%) patients were male. At index procedure median LSI was higher in the intervention group [6.4 (IQR 5.1–7) vs. 5.6 (IQR 4.5–6.9), P < 0.0001]. After 3 months, 126 patients (58 in intervention group) underwent EPS for primary endpoint assessment. Thirty (24%) patients had CTI re-conduction, distributed with 15 patients in each treatment group (P = 0.62). We observed no difference between treatment groups with regard to fluoroscopy, ablation, or procedure times, nor peri-procedural complications.
Conclusion
Contact force-guided ablation does not reduce re-conduction across the CTI after 3 months, nor does CF-guided ablation shorten fluoroscopy, ablation, or total procedure times.
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Affiliation(s)
- Mikkel Giehm-Reese
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Mads Brix Kronborg
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Peter Lukac
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Steen Buus Kristiansen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Henrik Kjærulf Jensen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Christian Gerdes
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Jens Kristensen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Jan Møller Nielsen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Jens Cosedis Nielsen
- Department of Cardiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
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Ariyarathna N, Kumar S, Thomas SP, Stevenson WG, Michaud GF. Role of Contact Force Sensing in Catheter Ablation of Cardiac Arrhythmias: Evolution or History Repeating Itself? JACC Clin Electrophysiol 2019; 4:707-723. [PMID: 29929663 DOI: 10.1016/j.jacep.2018.03.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 03/12/2018] [Accepted: 03/22/2018] [Indexed: 12/28/2022]
Abstract
Adequate catheter-tissue contact facilitates efficient heat energy transfer to target tissue. Tissue contact is thus critical to achieving lesion transmurality and success of radiofrequency (RF) ablation procedures, a fact recognized more than 2 decades ago. The availability of real-time contact force (CF)-sensing catheters has reinvigorated the field of ablation biophysics and optimized lesion formation. The ability to measure and display CF came with the promise of dramatic improvement in safety and efficacy; however, CF quality was noted to have just as important an influence on lesion formation as absolute CF quantity. Multiple other factors have emerged as key elements influencing effective lesion formation, including catheter stability, lesion contiguity and continuity, lesion density, contact homogeneity across a line of ablation, spatiotemporal dynamics of contact governed by cardiac and respiratory motion, contact directionality, and anatomic wall thickness, in addition to traditional ablation indices of power and RF duration. There is greater appreciation of surrogate markers as a guide to lesion formation, such as impedance fall, loss of pace capture, and change in unipolar electrogram morphology. In contrast, other surrogates such as tactile feedback, catheter motion, and electrogram amplitude are notably poor predictors of actual contact and lesion formation. This review aims to contextualize the role of CF sensing in lesion formation with respect of the fundamental principles of biophysics of RF ablation and summarize the state-of-the-art evidence behind the role of CF in optimizing lesion formation.
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Affiliation(s)
- Nilshan Ariyarathna
- Cardiology Department, The Canberra Hospital, Canberra, Australian Capital Territory, Australia
| | - Saurabh Kumar
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, New South Wales, Australia
| | - Stuart P Thomas
- Department of Cardiology, Westmead Hospital, Westmead Applied Research Centre, University of Sydney, New South Wales, Australia
| | - William G Stevenson
- Arrhythmia and Electrophysiology Program, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Gregory F Michaud
- Arrhythmia and Electrophysiology Program, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
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Choo WK, Raju H, Lipton J, Bates M, Kistler P, Sparks P, Morton J, Kalman J. Assessment of ablation catheter contact on valve annulus: Implications on accessory pathway ablation. Indian Pacing Electrophysiol J 2019; 19:84-89. [PMID: 30914382 PMCID: PMC6531925 DOI: 10.1016/j.ipej.2019.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 03/16/2019] [Accepted: 03/20/2019] [Indexed: 11/24/2022] Open
Abstract
Background Catheter-tissue contact force is an important factor influencing lesion size and efficacy and thereby potential for arrhythmia recurrence following accessory pathway (AP) radiofrequency ablation. We aim to evaluate adequacy and perception of catheter contact on the tricuspid and mitral annuli. Methods Data were collected from 42 patients undergoing catheter ablation. Operators were blinded to contact force information and reported perceived contact (poor, moderate, or good) while positioning the catheter at four tricuspid annular sites (12, 9, 6 and 4 o'clock positions; abbreviated as TA12, TA9, TA6 and TA4) and three mitral annular sites (3, 5 and 7 o'clock positions; abbreviated as MA3, MA5 and MA7) through long vascular sheaths. Results The highest and lowest mean contact forces were obtained at MA7 (13.3 ± 1.7 g) and TA12 (3.6 g ± 1.3 g) respectively. Mean contact force on tricuspid annulus (6.1 g ± 0.9 g) was lower than mitral annulus (9.8 ± 0.9 g) locations (p = 0.0036), with greater proportion of sites with <10 g contact force (81.7% vs 60.4%; p = 0.0075). Perceived contact had no impact on measured mean contact force for both mitral and tricuspid annular positions (p = 0.959 and 0.671 respectively). There was correlation of both impedance and atrial electrogram amplitude with contact force, though insufficient to be clinically applicable. Conclusion A high proportion of annular catheter applications have low contact force despite being performed with long vascular sheaths in the hands of experienced operators. In addition, there was no impact of operator perceived contact force on actual measured contact force. This may carry implications for success of AP ablation. The highest and lowest mean contact forces were obtained at posterolateral mitral and superior tricuspid annulus. Mean contact force on tricuspid annulus was lower than mitral annulus locations (p=0.0036). Perceived contact had no impact on measured mean contact force for both mitral and tricuspid annular positions. There was some correlation of both impedance and atrial electrogram amplitude with contact force.
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8
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Venier S, Andrade JG, Khairy P, Mondésert B, Dyrda K, Rivard L, Guerra PG, Dubuc M, Thibault B, Talajic M, Roy D, Macle L. Contact-force-guided vs. contact-force-blinded catheter ablation of typical atrial flutter: a prospective study. Europace 2018; 19:1043-1048. [PMID: 27377075 DOI: 10.1093/europace/euw137] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 04/20/2016] [Indexed: 11/13/2022] Open
Abstract
Aims It remains unknown whether contact force (CF) sensing technology is of value for cavotricuspid isthmus (CTI) ablation. We prospectively evaluated procedural parameters and outcomes of CF-guided vs. CF-blinded CTI ablation for typical atrial flutter (AFL). Methods and results A total of 70 consecutive patients (62.5 ± 10.9 years) undergoing CTI ablation for AFL were prospectively enrolled, 35 in CF-blinded and 35 in CF-guided groups. A CF-sensing catheter (power 25-35 W) was used in all. In the CF-guided group, CF target range was 10-25 g, whereas in the CF-blinded group, the operator was blinded to CF. The isthmus was divided into anterior, middle, and posterior segments for region-specific CF analysis. The procedural endpoint of bidirectional isthmus block following a 20-min observation period was achieved in all. A trend towards lower fluoroscopy and procedure duration was observed when the CF-guided group was compared with the CF-blinded group. The total radiofrequency (RF) energy delivery time required to achieve bidirectional block was significantly lower in the CF-guided vs. CF-blinded group [10.0 min (IQR 8.3;15.1) vs. 15.9 min (IQR 9.6;24.7), P= 0.0020], with a significant inverse correlation between CF and total RF delivery time (r = -0.36; P= 0.0027). Mean CF measurements significantly increased from anterior to posterior anatomical zones of CTI in the CF-blinded group (ANOVA P= 0.0466). Conclusions Catheter ablation of AFL guided by real-time CF assessment results in a significant reduction in total RF delivery time. Real-time CF measurements facilitate the maintenance of homogenous efficient contact all along the CTI, particularly in the anterior segment where CF is generally lower.
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Elsokkari I, Sapp JL, Doucette S, Parkash R, Gray CJ, Gardner MJ, Macintyre C, AbdelWahab AM. Role of contact force in ischemic scar-related ventricular tachycardia ablation; optimal force required and impact of left ventricular access route. J Interv Card Electrophysiol 2018; 53:323-331. [PMID: 29946899 DOI: 10.1007/s10840-018-0396-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 06/04/2018] [Indexed: 02/05/2023]
Abstract
BACKGROUND Contact force-sensing technology has become a widely used addition to catheter ablation procedures. Neither the optimal contact force required to achieve adequate lesion formation in the ventricle, nor the impact of left ventricular access route on contact force has been fully clarified. PATIENTS AND METHODS Consecutive patients (n = 24) with ischemic cardiomyopathy who underwent ablation for scar-related ventricular tachycardia were included in the study. All ablations (n = 25) were performed using irrigated contact force-sensing catheters (Smart Touch, Biosense Webster). Effective lesion formation was defined as electrical unexcitability post ablation at sites which were electrically excitable prior to ablation (unipolar pacing at 10 mA, 2 ms pulse width). We explored the contact force which achieved effective lesion formation and the impact of left ventricular access route (retrograde aortic or transseptal) on the contact force achieved in various segments of the left ventricle. Scar zone was defined as bipolar signal amplitude < 0.5 mV. RESULTS Among 427 ablation points, effective lesion formation was achieved at 201 points (47.1%). Contact force did not predict effective lesion formation in the overall group. However, within the scar zone, mean contact force ≥ 10 g was significantly associated with effective lesion formation [OR 3.21 (1.43, 7.19) P = 0.005]. In the 12-segment model of the left ventricle, the retrograde approach was associated with higher median contact force in the apical anterior segment (31 vs 19 g; P = 0.045) while transseptal approach had higher median force in the basal inferior segment (25 vs 15 g; P = 0.021). In the 4-segment model, the retrograde approach had higher force in the anterior wall (28 vs 16 g; P = 0.004) while the transseptal approach had higher force in the lateral wall (21 vs 18 g; P = 0.032). There was a trend towards higher force in the inferior wall with the transseptal approach, but this was not statistically significant (20 vs 15 g; P = 0.063). CONCLUSIONS In patients with ischemic cardiomyopathy, a mean contact force of 10 g or more within the scar zone had the best correlation with electrical unexcitability post ablation in our study. The retrograde aortic approach was associated with better contact force over the anterior wall while use of a transseptal approach had better contact force over the lateral wall.
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Affiliation(s)
- Ihab Elsokkari
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada.
| | - John L Sapp
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
| | | | - Ratika Parkash
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
| | - Christopher J Gray
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
| | - Martin J Gardner
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
| | - Ciorsti Macintyre
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
| | - Amir M AbdelWahab
- Queen Elizabeth II Health Sciences Centre, 1796 Summer street, Room 2501, Halifax, Nova Scotia, B3H 3A7, Canada
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GOULD PAULA, BOOTH CAMERON, DAUBER KIERAN, NG KEVIN, CLAUGHTON ANDREW, KAYE GERALDC. Characteristics of Cavotricuspid Isthmus Ablation for Atrial Flutter Guided by Novel Parameters Using a Contact Force Catheter. J Cardiovasc Electrophysiol 2016; 27:1429-1436. [DOI: 10.1111/jce.13087] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 08/01/2016] [Accepted: 08/09/2016] [Indexed: 12/26/2022]
Affiliation(s)
- PAUL A. GOULD
- University of Queensland; School of Medicine; Queensland Australia
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
| | - CAMERON BOOTH
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
| | - KIERAN DAUBER
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
| | - KEVIN NG
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
| | - ANDREW CLAUGHTON
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
| | - GERALD C. KAYE
- University of Queensland; School of Medicine; Queensland Australia
- Department of Cardiology; Princess Alexandra Hospital; Queensland Australia
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11
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Chakrabarti S, Deyell M. Friendly Fire During RF: Be Firm but Gentle! J Cardiovasc Electrophysiol 2015; 27:296-7. [PMID: 26661509 DOI: 10.1111/jce.12894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Santabhanu Chakrabarti
- Heart Rhythm Services, Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, Canada
| | - Marc Deyell
- Heart Rhythm Services, Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, Canada
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12
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Kumar S, Barbhaiya CR, Balindger S, John RM, Epstein LM, Koplan BA, Tedrow UB, Stevenson WG, Michaud GF. Better Lesion Creation And Assessment During Catheter Ablation. J Atr Fibrillation 2015; 8:1189. [PMID: 27957200 DOI: 10.4022/jafib.1189] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 04/03/2015] [Accepted: 07/02/2015] [Indexed: 12/17/2022]
Abstract
Permanent destruction of abnormal cardiac tissue responsible for cardiac arrhythmogenesis whilst avoiding collateral tissue injury forms the cornerstone of catheter ablation therapy. As the acceptance and performance of catheter ablation increases worldwide, limitations in current technology are becoming increasingly apparent in the treatment of complex arrhythmias such as atrial fibrillation. This review will discuss the role of new technologies aimed to improve lesion formation with the ultimate goal of improving arrhythmia-free survival of patients undergoing catheter ablation of atrial arrhythmias.
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Affiliation(s)
- Saurabh Kumar
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Chirag R Barbhaiya
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Samuel Balindger
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Roy M John
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Laurence M Epstein
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Bruce A Koplan
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Usha B Tedrow
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - William G Stevenson
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
| | - Gregory F Michaud
- Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115
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KUMAR SAURABH, MORTON JOSEPHB, LEE GEOFFREY, HALLORAN KAREN, KISTLER PETERM, KALMAN JONATHANM. High Incidence of Low Catheter-Tissue Contact Force at the Cavotricuspid Isthmus During Catheter Ablation of Atrial Flutter: Implications for Achieving Isthmus Block. J Cardiovasc Electrophysiol 2015; 26:826-831. [DOI: 10.1111/jce.12707] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 04/16/2015] [Accepted: 04/24/2015] [Indexed: 11/29/2022]
Affiliation(s)
- SAURABH KUMAR
- Department of Cardiology, The Royal Melbourne Hospital, and Department of Medicine; University of Melbourne; Parkville Victoria Australia
- Department of Medicine; University of Melbourne; Victoria Australia
| | - JOSEPH B. MORTON
- Department of Cardiology, The Royal Melbourne Hospital, and Department of Medicine; University of Melbourne; Parkville Victoria Australia
- Department of Medicine; University of Melbourne; Victoria Australia
| | - GEOFFREY LEE
- Department of Cardiology, The Royal Melbourne Hospital, and Department of Medicine; University of Melbourne; Parkville Victoria Australia
- Department of Medicine; University of Melbourne; Victoria Australia
| | - KAREN HALLORAN
- Department of Medicine; University of Melbourne; Victoria Australia
| | - PETER M. KISTLER
- Department of Medicine; University of Melbourne; Victoria Australia
- Department of Cardiology; Alfred Hospital and Baker IDI; Prahran Victoria Australia
| | - JONATHAN M. KALMAN
- Department of Cardiology, The Royal Melbourne Hospital, and Department of Medicine; University of Melbourne; Parkville Victoria Australia
- Department of Medicine; University of Melbourne; Victoria Australia
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Kimura T, Takatsuki S, Oishi A, Negishi M, Kashimura S, Katsumata Y, Nishiyama T, Nishiyama N, Tanimoto Y, Aizawa Y, Fukuda K. Operator-blinded contact force monitoring during pulmonary vein isolation using conventional and steerable sheaths. Int J Cardiol 2014; 177:970-6. [DOI: 10.1016/j.ijcard.2014.09.189] [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] [Received: 06/26/2014] [Revised: 09/20/2014] [Accepted: 09/28/2014] [Indexed: 01/21/2023]
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Jones MA, Webster D, Wong KCK, Hayes C, Qureshi N, Rajappan K, Bashir Y, Betts TR. The benefit of tissue contact monitoring with an electrical coupling index during ablation of typical atrial flutter--a prospective randomised control trial. J Interv Card Electrophysiol 2014; 41:237-44. [PMID: 25234603 DOI: 10.1007/s10840-014-9943-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 07/30/2014] [Indexed: 11/26/2022]
Abstract
INTRODUCTION We sought to investigate the use of tissue contact monitoring by means of the electrical coupling index (ECI) in a prospective randomised control trial of patients undergoing cavotricuspid isthmus (CTI) ablation for atrial flutter. METHODS Patients with ECG-documented typical flutter undergoing their first CTI ablation were randomised to ECI™-guided or non-ECI™-guided ablation. An irrigated-tip ablation catheter was used in all cases. Consecutive 50-W, 60-s radiofrequency lesions were applied to the CTI, from the tricuspid valve to inferior vena cava, with no catheter movement permitted during radiofrequency (RF) delivery. The ablation endpoint was durable CTI block at 20 min post-ablation. Patients underwent routine clinic follow-up post-operatively. RESULTS A total of 101 patients (79 male), mean age 66 (+/-11), 50 ECI-guided and 51 control cases were enrolled in the study. CTI block was achieved in all. There were no acute complications. All patients were alive at follow-up. CTI block was achieved in a single pass in 36 ECI-guided and 30 control cases (p = 0.16), and at 20 min post-ablation, re-conduction was seen in 5 and 12 cases, respectively (p = 0.07). There was no significant difference in total procedure time (62.7 ± 33 vs. 62.3 ± 33 min, p = 0.92), RF requirement (580 ± 312 vs. 574 ± 287 s, p = 0.11) or fluoroscopy time (718 ± 577 vs. 721 ± 583 s, p = 0.78). After 6 ± 4 months, recurrence of flutter had occurred in 1 (2 %) ECI vs. 8 (16 %) control cases (OR 0.13, 95 % CI 0.01-1.08, p = 0.06). CONCLUSIONS ECI-guided CTI ablation demonstrated a non-statistically significant reduction in late recurrence of atrial flutter, at no cost to procedural time, radiation exposure or RF requirement.
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Affiliation(s)
- Michael A Jones
- Department of Cardiology, Oxford University Hospitals NHS Trust, Oxford, OX3 9DU, United Kingdom,
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Tilz RR, Makimoto H, Lin T, Rillig A, Metzner A, Mathew S, Deiss S, Wissner E, Rausch P, Kamioka M, Heeger C, Kuck KH, Ouyang F. In vivo left-ventricular contact force analysis: comparison of antegrade transseptal with retrograde transaortic mapping strategies and correlation of impedance and electrical amplitude with contact force. Europace 2014; 16:1387-95. [PMID: 24493339 PMCID: PMC4149607 DOI: 10.1093/europace/eut430] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AIMS Clinical outcomes following radiofrequency ablation of ventricular tachycardias (VTs) depend on catheter tip-to-tissue contact force (CF). Left-ventricular (LV) mapping is performed via antegrade-transseptal or retrograde-transaortic approaches, and the applied CF may depend on the approach used. This study evaluated (i) the impact of antegrade-transseptal vs. retrograde-transaortic LV-mapping approaches on CF and catheter stability and (ii) the clinical value of the commonly used surrogate markers of catheter-myocardial contact-impedance, unipolar, and bipolar electrogram amplitudes. METHODS AND RESULTS An antegrade-transseptal and a retrograde-transaortic LV-mapping approach was performed in 10 patients undergoing VT ablation by using CF-sensing catheters. Operators were blinded to CF data and data were analysed according to 11 predefined LV segments. Three thousand three hundred and twenty-four mapping points (1577 antegrade, 1747 retrograde) were analysed, including 80 (2.4%) points with maximum CF > 100 g. Median antegrade and retrograde CF were 16.0 g (q1-q3; 8.4-26.2) and 15.3 g (9.8-23.4), respectively. Contact force was significantly higher antegradely in mid-anteroseptum, mid-lateral, and apical segments, and significantly higher retrogradely in basal-anteroseptum, basal-inferoseptum, basal-inferior, and basal-lateral segments. Contact force did correlate with impedance, unipolar, and bipolar electrogram amplitudes; however, there were large overlaps. CONCLUSIONS Antegrade vs. retrograde LV-mapping approaches result in different CF. A combined approach to the LV mapping may improve the overall LV mapping, potentially resulting in better clinical outcomes for the left VT catheter ablation. The previous surrogate markers used to assess CF do correlate with in vivo CF; however, due to a larger overlap, their clinical value is limited.
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Affiliation(s)
- Roland Richard Tilz
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Hisaki Makimoto
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Tina Lin
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Andreas Rillig
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Andreas Metzner
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Shibu Mathew
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Sebastian Deiss
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Erik Wissner
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Peter Rausch
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Masashi Kamioka
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Christian Heeger
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Karl-Heinz Kuck
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
| | - Feifan Ouyang
- Department of Cardiology, Asklepios Klinik St Georg, Lohmuehlenstr 5, 20099 Hamburg, Germany
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