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Lacko CS, Chen Q, Mendoza V, Parikh V, Eichenbaum G, Bar-Tal M, Eckert CE, De Leon H, Matonick JP, Sharma T. Development of a clinically relevant ex vivo model of cardiac ablation for testing of ablation catheters. J Cardiovasc Electrophysiol 2023; 34:682-692. [PMID: 36482158 DOI: 10.1111/jce.15768] [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: 03/03/2022] [Revised: 11/22/2022] [Accepted: 11/26/2022] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Reliable ex vivo cardiac ablation models have the potential to increase catheter testing throughput while minimizing animal usage. The goal of this work was to develop a physiologically relevant ex vivo swine model of cardiac ablation displaying minimal variability and high repeatability and identify and optimize key parameters involved in ablation outcomes. METHODS AND RESULTS A root cause analysis was conducted to identify variables affecting ablation outcomes. Parameters associated with the tissue, bath media, and impedance were identified. Variables were defined experimentally and/or from literature sources to best mimic the clinical cardiac ablation setting. The model was validated by performing three independent replicates of ex vivo myocardial ablation and a direct comparison of lesion outcomes of the ex vivo swine myocardial and in vivo canine thigh preparation (TP) models. Replicate experiments on the ex vivo model demonstrated low variance in ablation depth (6.5 ± 0.6, 6.3 ± 0.6, 6.2 ± 0.4 mm) and width (10.4 ± 1.1, 9.7 ± 1.0, 9.9 ± 0.9 mm) and no significant differences between replicates. In a direct comparison of the two models, the ex vivo model demonstrated ablation depths similar to the canine TP model at 35 W (6.9 ± 1.0, and 7.0 ± 0.9 mm) and 50 W (8.0 ± 0.7, and 8.4 ± 0.7 mm), as well as similar power to depth ratios (15% and 19% for the ex vivo cardiac and in vivo TP models, respectively). CONCLUSION The ex vivo model exhibited strong lesion reproducibility and power-to-depth ratios comparable to the in vivo TP model. The optimized ex vivo model minimizes animal usage with increased throughput, lesion characteristics similar to the in vivo TP model, and ability to discriminate minor variations between different catheter designs.
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Affiliation(s)
| | - Qi Chen
- Biosense Webster, Inc, Irvine, California, USA
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He M, Qiu J, Bai Y, Wang Y, Hu M, Chen G. Non-pharmaceutical Interventions for Hypertrophic Cardiomyopathy: A Mini Review. Front Cardiovasc Med 2021; 8:695247. [PMID: 34722651 PMCID: PMC8553933 DOI: 10.3389/fcvm.2021.695247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 09/20/2021] [Indexed: 11/13/2022] Open
Abstract
Hypertrophic cardiomyopathy is an inherited cardiovascular disease, and 70% of patients have left ventricular outflow tract obstruction. Ventricular septal myectomy has been the gold standard treatment for most patients with refractory symptoms. Due to higher mortality associated with medical facilities with less experience, alcohol septal ablation has been accepted as an alternative to conventional surgical myectomy. It offers lower all-cause in-hospital complications and mortality, which could be potentially more preferable for patients with serious comorbidities. In recent years, radiofrequency ablation, providing another option with reproducibility and a low risk of permanent atrioventricular block, has become an effective invasive treatment to relieve left ventricular outflow tract obstruction. Moreover, substantial progress has been made in gene therapy for hypertrophic cardiomyopathy. The principal objective of this review is to present recent advances in non-pharmaceutical interventions in hypertrophic cardiomyopathy.
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Affiliation(s)
- Miaomiao He
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jie Qiu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Bai
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yan Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Mei Hu
- Health Management Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Guangzhi Chen
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Matteucci F, Maesen B, De Asmundis C, Bidar E, Micali L, Parise G, Maessen JG, La Meir M, Gelsomino S. Biparietal bidirectional bipolar radiofrequency in hybrid cardiac ablation: an in vitro evaluation. Interact Cardiovasc Thorac Surg 2021; 33:34-42. [PMID: 33611536 DOI: 10.1093/icvts/ivab047] [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: 10/16/2020] [Revised: 12/21/2020] [Accepted: 01/21/2021] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES The aim of this study was to evaluate the lesion size and depth of radiofrequency (RF) ablation in a simultaneous biparietal bidirectional bipolar (SBB) approach, compared to a simultaneous and staged unipolar and uniparietal bipolar setup [simultaneous uniparietal bipolar (SiUB) and staged uniparietal bipolar (StUB), respectively]. METHODS Fresh left atrial porcine tissue was mounted into the ABLA-BOX simulator. Different ablation approaches were tested: (i) SBB: a concept consisting of SBB endo-epicardial ablation, (ii) SiUB: simultaneous epicardial uniparietal bipolar and endocardial unipolar ablation and (iii) StUB: staged epicardial uniparietal bipolar and endocardial unipolar ablation. In the StUB setup, a 1-h interval between the epi-endo ablation was respected. RESULTS Transmural lesions were present in 90% of the bipolar biparietal ablations, yet no full transmurality was observed in the simultaneous nor in the staged unipolar with uniparietal bipolar ablation group. In SBB, the area and volume of the ablation lesions were smaller (523.33 mm2/mm and 52.33 mm3/mm, respectively) than in SiUB (588.17 mm2/mm and 58.81 mm3/mm, respectively) and StUB (583.76 mm2/mm and 58.37 mm3/mm, P = 0.044). Also, in SBB, the overall, epicardial and endocardial maximum diameters of the lesions (1.59, 1.57 and 1.52 mm; respectively) were smaller than in SiUB (2.38, 2.26 and 2.33 mm; respectively) and in StUB (2.36, 2.28 and 2.14 mm; respectively, all P < 0.001). CONCLUSIONS Although bipolar biparietal bidirectional RF ablation results in smaller lesions than uniparietal bipolar and unipolar ablation, their capacity to penetrate the tissue is much higher. Moreover, in uniparietal RF applications, the energy spreads in the superficial layers of the tissue but fails to penetrate. Therefore, the degree of transmurality is much higher when using such a 'truly bipolar' ablation approach.
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Affiliation(s)
- Francesco Matteucci
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Bart Maesen
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Carlo De Asmundis
- Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Elham Bidar
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Linda Micali
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Gianmarco Parise
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Jos G Maessen
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands
| | - Mark La Meir
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands.,Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Sandro Gelsomino
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, Netherlands.,Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
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Matteucci F, Maesen B, De Asmundis C, Parise G, Micali LR, Tuijthof G, Gerits P, Vernooy K, Maessen JG, La Meir M, Gelsomino S. New Biparietal Bipolar Catheter Prototype for Hybrid Atrial Fibrillation Ablation. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2021; 16:181-187. [PMID: 33410714 PMCID: PMC8108111 DOI: 10.1177/1556984520981025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Objective To evaluate the size and depth of linear lesions by in vitro testing with a custom-made radio frequency biparietal bipolar ablation catheter in a single-stage setting. Methods A custom-made catheter was created to generate linear lesions around the left atrium and pulmonary veins of an ex vivo pig. Two frames were made, 1 epicardial and 1 endocardial. A continuous copper braid electrode and an alignment system consisting of 2 parallel rows of neodymium magnets were embedded in a flexible plastic support. After 24 hours of formalin conservation, samples of the left atrium of a freshly slaughtered pig were sliced in a cryotome, thus obtaining a sequence of 100-µm thick layers extending from the endocardial to the epicardial side. After being digitized through a scanner, these layers were evaluated using morphometric computer software. For each slice, we evaluated the maximum length of the lesions, the maximum epicardial length, the maximum endocardial length, the total area of the lesion, and the total volume. Results Forty transmural lesions from 40 specimens were obtained. The results were the following (the number in parenthesis is the interquartile range in mm): lesion maximum length (LMAX) was 7.297 mm (0.006), epicardial maximum length (LEPI) was 7.291 mm (0.014), and endocardial maximum length was 7.291 mm (0.018). The total area and total volume were 1018.50 ± 36.51 mm2 and 101.85 ± 3.65 mm3, respectively. Conclusions Our prototype showed very promising results. The next step will be to enhance the design for clinical application.
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Affiliation(s)
- Francesco Matteucci
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Bart Maesen
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands.,5211 Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands
| | - Carlo De Asmundis
- 60201 Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Gianmarco Parise
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Linda Renata Micali
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Gabrielle Tuijthof
- 5211 IDEE Engineering, Maastricht University, Maastricht, The Netherlands
| | - Peter Gerits
- 118066 Maastricht Instruments BV, Maastricht, The Netherlands
| | - Kevin Vernooy
- 5211 Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands
| | - Jos G Maessen
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands.,5211 Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands
| | - Mark La Meir
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands.,60201 Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Sandro Gelsomino
- 118066 Cardiovascular Research Institute Maastricht - CARIM, Maastricht University Medical Center, Maastricht, The Netherlands.,60201 Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
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Matteucci F, Maesen B, De Asmundis C, Bidar E, Parise G, Maessen JG, La Meir M, Gelsomino S. Comparison between biparietal bipolar and uniparietal bipolar radio frequency ablation techniques in a simultaneous procedural setting. J Interv Card Electrophysiol 2020; 61:567-575. [PMID: 32833110 PMCID: PMC8376704 DOI: 10.1007/s10840-020-00852-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Accepted: 08/12/2020] [Indexed: 11/22/2022]
Abstract
Purpose To make an in vitro evaluation of the lesion size and depth produced in two different sets of radio frequency energy bipolar delivery: simultaneous biparietal bipolar (SBB) and simultaneous uniparietal bipolar (SUB). Methods Two separate prototypes have been built for our purpose: one to be used in SBB mode and the other to be used SUB mode. Forty left atrium samples were taken from the hearts of freshly slaughtered pigs. They were ablated into a simulator ABLABOX, where blood flow, temperature, and contact force were controlled. After being sliced into a cryotome, the samples were digitalized by a flatbed scanner, and the images were analyzed by a computer morphometric software. Results Transmural lesions were achieved in 18/20 samples (90%) in SBB, while SUB showed transmurality in 9/20 samples (45%). Overall maximum diameter (DMAX) resulted larger in SUB than in SBB (2.43 ± 0.30 mm, 1.62 ± 0.14 mm, respectively; p < 0.05): Moreover, maximum epicardial and endocardial diameters (DEPI and DENDO, respectively) were wider in SUB group than SBB group (2.28 ± 0.30 mm, 2.26 ± 0.40 and 1.60 ± 0.14 mm, 1.59 ± 0.15 mm, respectively; p < 0.05). We observed the same tendency in lesion depth: The total area and volume (ATOT and VTOT) were broader in SUB group than in SBB one (581.01 ± 65.38 mm/mm2, 58.10 ± 6.53 mm/mm3 and 521.97 ± 73.05 mm/mm2, 52.19 ± 7.30 mm/mm3. respectively; p < 0.05). Conclusions In contrast with the smaller lesion sizes, the biparietal bipolar group showed a higher transmurality rate. These findings may suggest a better drive of the energy flow when compared with SUB lesions.
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Affiliation(s)
- Francesco Matteucci
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands. .,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands.
| | - Bart Maesen
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Carlo De Asmundis
- Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Elham Bidar
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Gianmarco Parise
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Jos G Maessen
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Mark La Meir
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
| | - Sandro Gelsomino
- Cardiothoracic Department, Maastricht University Hospital, Maastricht, The Netherlands.,Department of Cardiothoracic Surgery, Cardiovascular Research Institute Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands.,Cardiothoracic Department, Brussels University Hospital, Brussels, Belgium
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Matteucci F, Maesen B, Vernooy K, De Asmundis C, Maessen JG, La Meir M, Gelsomino S. One-Stage Versus Sequential Hybrid Radiofrequency Ablation: An In Vitro Evaluation. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2020; 15:338-345. [DOI: 10.1177/1556984520930070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Objective To compare lesion size and depth between a 1-step, a sequential, and a delayed radio-frequency ablation in a hybrid setup. Methods Left atrium tissues obtained from fresh porcine hearts were mounted into the ABLABOX simulator. Based on the time differences between the index epicardial (epi) and consequent endocardial (endo) ablation, 3 study groups were compared: a 1-stage (SEQ- 0) group (0-minute delay), an SEQ 1 group (60-minute delay), and an SEQ 2 group (240-minute delay). During the experiment, a constant epicardial (300 gr) and endocardial (30 gr) force were applied. Per group, 20 samples were studied, and the resulting lesion size and depth were quantified with morphometric evaluation. Results Overall, no transmural lesion was obtained. Lesions in SEQ 0 had better maximum and minimum diameters ( P < 0.001), a larger total area ( P < 0.001), and volume ( P < 0.001) than SEQ 1 and SEQ 2. There was no statistical difference in morphometric parameters (all, P > 0.05) between the delayed procedures (SEQ 1 and SEQ 2). Conclusions In our in vitro model, different time sequences of combined epi–endo ablation did not result in transmural lesions. However, simultaneous epi–endo ablation produced broader and deeper lesions. Our findings need to be confirmed by further research.
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Affiliation(s)
| | - Bart Maesen
- Cardiothoracic Department Maastricht University Hospital, The Netherlands
| | - Kevin Vernooy
- Cardiothoracic Department Maastricht University Hospital, The Netherlands
| | | | - Jos G. Maessen
- Cardiothoracic Department Maastricht University Hospital, The Netherlands
| | - Mark La Meir
- Cardiothoracic Department Maastricht University Hospital, The Netherlands
- Cardiothoracic Department Brussels University Hospital, Belgium
| | - Sandro Gelsomino
- Cardiothoracic Department Maastricht University Hospital, The Netherlands
- Cardiothoracic Department Brussels University Hospital, Belgium
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