Article
Cardiac & Cardiovascular Systems
Sven Knecht, Vincent Schlageter, Patrick Badertscher, Philipp Krisai, Florian Jousset, Thomas Kuffer, Antonio Madaffari, Beat Schaer, Stefan Osswald, Christian Sticherling, Michael Kuhne
Summary: This study investigates the relationship between the bipolar voltage (BV) amplitude (BVA) using four catheters with different electrode design and identifies their specific cutoff values for scar and healthy tissue in patients with atrial fibrillation. The results show significant differences in LA BVA measurements between focal, multi-electrode, and mini-electrode catheters, indicating the need for adapted cutoff values for different catheters.
Article
Cardiac & Cardiovascular Systems
Jumpei Saito, Kennosuke Yamashita, Takaki Numajiri, Yuma Gibo, Soichiro Usumoto, Syuro Narui, Tatsuki Fujioka, Yu Asukai, Wataru Igawa, Morio Ono, Seitaro Ebara, Toshitaka Okabe, Naoei Isomura, Masahiko Ochiai
Summary: This study compared the effectiveness of grid mapping catheter and PentaRay catheter for left atrial voltage mapping, with the results showing that the grid mapping catheter yielded more mapping points and points per minute compared to the PentaRay catheter. Additionally, the size of low-voltage areas identified was smaller when using the grid mapping catheter.
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2022)
Article
Medicine, General & Internal
Jongmin Hwang, Hyoung-Seob Park, Seongwook Han, Cheol Hyun Lee, In-Cheol Kim, Yun-Kyeong Cho, Hyuck-Jun Yoon, Jin Wook Chung, Hyungseop Kim, Chang-Wook Nam, Seung-Ho Hur, Jin Young Kim, Yun Seok Kim, Woo Sung Jang
Summary: The study evaluated the efficacy of targeting complex fractionated atrial electrogram (CFAE) areas within low voltage zones in persistent AF ablation. The PVI + CFAE group had a higher 1-year AF free survival, but no difference in AF/AT free survival.
Article
Geochemistry & Geophysics
Ernest Bell, Nicholas Schmerr, Kelsey Young, Sanaz Esmaeili, W. Brent Garry, Sajad Jazayeri, Sarah Kruse, Jacob Richardson, Patrick Whelley
Summary: Lava tubes are common features on terrestrial planets and hold valuable information about lava flow processes. Exploring lava tubes on the Moon can provide access to geologic environments that have remained unchanged for billions of years and offer protection to astronauts. By using magnetometry, we can determine the size and location of lava tubes on Earth and predict the magnetic anomalies that would be present on lunar lava tubes. This information is crucial for future scientific investigations and human exploration of lava tubes.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Cardiac & Cardiovascular Systems
Mathijs S. van Schie, Rongheng Liao, Nawin L. Ramdat Misier, Paul Knops, Annejet Heida, Yannick J. H. J. Taverne, Natasja M. S. de Groot
Summary: This study aimed to investigate the effect of atrial extrasystoles (AES) on myocardial electrical signals. The study found that AES could decrease the amplitude of the signals, increase the fractionation and duration, and lead to more low-voltage areas. These effects were correlated with the prematurity index and degree of aberrancy of the AES, and were more pronounced in patients with atrial fibrillation (AF).
Article
Engineering, Biomedical
Tiago P. Almeida, Diogo C. Soriano, Michela Mase, Flavia Ravelli, Arthur S. Bezerra, Xin Li, Gavin S. Chu, Joao Salinet, Peter J. Stafford, G. Andre Ng, Fernando S. Schlindwein, Takashi Yoneyama
Summary: Utilizing unsupervised classification and AEG-derived markers, five distinct classes of AEGs were identified with significant differences in characteristics, potentially offering a more comprehensive substrate characterization for ablation target identification in future clinical studies.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2021)
Article
Cardiac & Cardiovascular Systems
Sabrina Smith, Clare Coyle, Niti Dhutia, Prapa Kanagaratnam, Nick W. F. Linton
Summary: In this study, a new method called RETRO-Mapping was proposed to quantify plane activity in atrial fibrillation. The results showed that RETRO-Mapping can measure electrophysiological features of activation activity and detect plane activity in three types of AF.
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jinchi Cai, Igor Syratchev, Graeme Burt
Summary: The study investigates the monopole monotron instability in linear beam devices and successfully identifies and resolves the issue in the development of a high-efficiency 50-MW X-band klystron. Through 3-D particle-in-cell computer codes simulations, a previously unreported and complex rotating multipolar monotron instability phenomenon is discovered, along with proposed suppression strategies.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Geosciences, Multidisciplinary
J. B. Johnson, T. Boyer, L. M. Watson, J. F. Anderson
Summary: We explore the capabilities of volcano opto-acoustics, a promising technique for measuring explosion and infrasound resonance phenomena at open-vent volcanoes. Joint visual and infrasound study at Yasur Volcano (Vanuatu) demonstrate that even consumer-grade cameras are capable of recording infrasound with high fidelity. Optical tracking of pressure wavefields induced by infrasonic waves can be used to identify spectral characteristics, which vary within Yasur's two deep craters and are distinct for explosion and tremor sources.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Physiology
Shun Liao, Don Ragot, Sachin Nayyar, Adrian Suszko, Zhaolei Zhang, Bo Wang, Vijay S. Chauhan
Summary: This study utilized deep learning (DL) model to train on raw unipolar EGMs for automated and accurate identification of potential focal sources. The performance of DL was comparable to that of re-classification by cardiologists. Future application of DL for focal source classification may improve the efficiency of targeted AF ablation therapy.
FRONTIERS IN PHYSIOLOGY
(2021)
Article
Environmental Sciences
Moritz Roesch, Simon Plank
Summary: This study introduces a novel object-oriented classification approach for mapping lava flows in unvegetated areas of active volcanoes using high-resolution satellite data. The results show that the developed method produces good results for monitoring volcanic hazards.
Article
Cardiac & Cardiovascular Systems
Marco Bergonti, Francesco Raffaele Spera, Teba Gonzalez Ferrero, Michelle Nsahlai, Alice Bonomi, Maxime Tijskens, Wim Boris, Johan Saenen, Wim Huybrechts, Hielko Miljoen, Jose Ramon Gonzalez-Juanatey, Jose Luis Martinez-Sande, Lien Vandaele, Anouk Wittock, Hein Heidbuchel, Miguel Valderrabano, Moises Rodriguez-Manero, Andrea Sarkozy
Summary: This study analyzed the relationship between low-voltage zones (LVZs), transition zones, and AF recurrence. The findings suggest that LVZs have a greater impact on persistent AF than paroxysmal AF. There is a significant association between LVZs and transition zones, as well as LVZs and left atrial volume index (LAVI). Overall, the study is rated a 8 out of 10.
JOURNAL OF THE AMERICAN HEART ASSOCIATION
(2023)
Article
Cardiac & Cardiovascular Systems
Gilson C. Fernandes, Tri Nguyen, Ekaterina Creed, Kichang Lee, Kitae Jung, Benjamin Hack, William Hucker, Alan Hanley
Summary: This case report demonstrates the successful ablation of refractory intramural ventricular arrhythmia by incorporating electrodes of a mapping catheter into the ablation circuit. The study also provides insights into the characteristics of multipolar ablation lesions using different ablation settings and confirms the feasibility of generating transmural lesions with multipolar ablation in a porcine model.
JACC-CLINICAL ELECTROPHYSIOLOGY
(2023)
Article
Environmental Sciences
Brett B. Carr, Einat Lev, Theresa Sawi, Kristen A. Bennett, Christopher S. Edwards, S. Adam Soule, Silvia Vallejo Vargas, Gayatri Indah Marliyani
Summary: This study presents a new approach for mapping and classifying volcanic deposits using a multi-sensor unoccupied aerial system (UAS), demonstrating its application on lava and tephra deposits associated with the 2018 eruption of Sierra Negra volcano. The research utilized visible and thermal infrared images to create a digital elevation model and calculate the solar heating rate, finding correlations with surface density and particle size. The combination of surface roughness and solar heating rate was used for remote classification of tephra deposits and different lava morphologies, showcasing potential for high-resolution mapping of various volcanic deposits.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Gurpreet Singh Dhillon, Nikhil Ahluwalia, Shohreh Honarbakhsh, Adam Graham, Antonio Creta, Hakam Abbass, Anthony Chow, Mark J. Earley, Pier D. Lambiase, Richard J. Schilling, Ross J. Hunter
Summary: The study evaluated the effect of adenosine on mechanisms sustaining persistent AF through analysis of contact electrograms and ECGI mapping. Results showed that adenosine led to a significant shortening of CL, especially in the right atrium, which may relate to shortening of refractory periods rather than an increase in driver burden or distribution.
Article
Cardiac & Cardiovascular Systems
Thomas Bonnin, Pierre Roumegou, Soumaya Sridi, Saagar Mahida, Aurelien Bustin, Josselin Duchateau, Romain Tixier, Nicolas Derval, Thomas Pambrun, Ghassen Chniti, Takamitsu Takagi, Tsukasa Kamakura, Philipp Krisai, Clementine Andre, Remi Chauvel, Meleze Hocini, Michel Haissaguerre, Pierre Jais, Hubert Cochet, Frederic Sacher
Summary: This study assessed the prevalence, risk factors, and management of intra-cardiac thrombus in patients referred for scar-related VT ablation. The results showed that 11% of patients had cardiac thrombi, highlighting the importance of systematic thrombus screening to minimize the risk of embolism.
Editorial Material
Cardiac & Cardiovascular Systems
Sylvain Ploux, Marc Strik, Hubert Cochet, Pierre Bordachar
EUROPEAN HEART JOURNAL
(2023)
Article
Cardiac & Cardiovascular Systems
F. Daniel Ramirez, Marianna Meo, Corentin Dallet, Philipp Krisai, Konstantinos Vlachos, Antonio Frontera, Masateru Takigawa, Yosuke Nakatani, Takashi Nakashima, Clementine Andre, Tsukasa Kamakura, Takamitsu Takagi, Aline Carapezzi, Romain Tixier, Remi Chauvel, Ghassen Cheniti, Josselin Duchateau, Thomas Pambrun, Frederic Sacher, Mfileze Hocini, Michel Haissaguerre, Pierre Jais, Remi Dubois, Nicolas Derval
Summary: This study aimed to evaluate the diagnostic performance of bipolar voltage thresholds in identifying regions of slow conduction during reentrant atrial tachycardias. The results showed that bipolar voltage can predict regions of slow conduction, but the correlation between voltage and conduction velocity is modest. Furthermore, no clinical predictors of AT circuit dimensions were identified.
Editorial Material
Cardiac & Cardiovascular Systems
Frederic Sacher, Pierre Jais, Hubert Cochet
Summary: This editorial discusses the article by L. Xu et al. on lipomatous metaplasia and its effects on repolarization and repolarization dispersion within post-infarct ventricular tachycardia circuits.
Article
Multidisciplinary Sciences
Manon Desclides, Valery Ozenne, Pierre Bour, Thibaut Faller, Guillaume Machinet, Christophe Pierre, Stephane Chemouny, Bruno Quesson
Summary: A method to automatically regulate temperature increase during Laser-Induced Thermotherapy (LITT) using real-time rapid volumetric Magnetic Resonance thermometry is presented, with excellent accuracy and stability for temperature increases up to +30 degrees C above body temperature and a long heating duration.
SCIENTIFIC REPORTS
(2023)
Article
Cardiac & Cardiovascular Systems
Miruna A. Popa, Gabriele Hessling, Isabel Deisenhofer, Felix Bourier
Summary: This study describes a novel catheter ablation strategy for treating symptomatic right ventricular outflow tract ventricular tachycardia. The strategy involves electrical isolation of the right ventricular outflow tract using high-density electroanatomic mapping and CT reconstruction. The patient remained free of arrhythmia during a 6-month follow-up period.
EUROPEAN HEART JOURNAL-CASE REPORTS
(2023)
Editorial Material
Cardiac & Cardiovascular Systems
Felix Bourier, Heribert Schunkert
CARDIOVASCULAR RESEARCH
(2023)
Letter
Cardiac & Cardiovascular Systems
Michel Haissaguerre, Josselin Duchateau, Mikael Laredo, Thomas Lavergne, Pierre F. Winum, Ghassen Cheniti, Xavier Waintraub, Sophie Samson, Elodie Surget, Romain Tixier, Frederic Sacher, Eloi Marijon, Olivier Bernus, Estelle Gandjbakhch
Review
Cardiac & Cardiovascular Systems
Philipp Sommer, Vanessa Sciacca, Matteo Anselmino, Roland Tilz, Felix Bourier, Heiko Lehrmann, Alan Bulava
Summary: Interventional electrophysiology provides various treatment options for patients with symptomatic cardiac arrhythmia. Catheter ablation has become a cornerstone in modern arrhythmia management, and complex procedures using multiple ablation tools have been developed. However, the use of X-ray technologies in fluoroscopy poses serious health risks. The main goal of radiation management is to reduce fluoroscopy and establish optimal protection for patients and operators. This manuscript provides an overview of strategies for fluoroscopy reduction and radiation protection.
Article
Cardiac & Cardiovascular Systems
Masateru Takigawa, Tsukasa Kamakura, Claire Martin, Nicolas Derval, Ghassen Cheniti, Josselin Duchateau, Thomas Pambrun, Frederic Sacher, Hubert Cochet, Meleze Hocini, Miho Negishi, Tasuku Yamamoto, Takashi Ikenouchi, Kentaro Goto, Takatoshi Shigeta, Takuro Nishimura, Susumu Tao, Shinsuke Miyazaki, Masahiko Goya, Tetsuo Sasano, Michel Haissaguierre, Pierre Jais
Summary: Detailed analysis of the cycle length of atrial tachycardia can help predict the mechanism and localization of the tachycardia.
Article
Cardiac & Cardiovascular Systems
Masateru Takigawa, Frederic Sacher, Claire Martin, Ghassen Cheniti, Josselin Duchateau, Thomas Pambrun, Nicolas Derval, Hubert Cochet, Meleze Hocini, Tasuku Yamamoto, Takuro Nishimura, Susumu Tao, Shinsuke Miyazaki, Masahiko Goya, Tetsuo Sasano, Michel Haissaguierre, Pierre Jais
Summary: This study aimed to investigate the impact of filter settings on ventricular tachycardia (VT) ablation. The results showed that in scar/border areas, the filter configuration of 30-250 Hz or 30-500 Hz can minimize baseline fluctuation, baseline noise, and detect local abnormal ventricular activity (LAVA), while not applying a 50 Hz notch filter may be beneficial in avoiding missing VT substrate.
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2023)
Editorial Material
Cardiac & Cardiovascular Systems
Felix Bourier
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2023)
Article
Cardiac & Cardiovascular Systems
Ghassen Cheniti, Michel Haissaguerre, Christian Dina, Tsukasa Kamakura, Josselin Duchateau, Frederic Sacher, Hugo-Pierre Racine, Elodie Surget, Floriane Simonet, Jean-Baptiste Gourraud, Soumaya Sridi, Hubert Cochet, Clementine Andre, Benjamin Bouyer, Remi Chauvel, Romain Tixier, Nicolas Derval, Thomas Pambrun, Remi Dubois, Pierre Jais, Koonlawee Nademanee, Richard Redon, Jean-Jacques Schott, Vincent Probst, Meleze Hocini, Julien Barc, Olivier Bernus
Summary: Patients with Brugada syndrome may have abnormal substrate extending onto the left ventricular (LV) epicardium and inferior right ventricle (RV), and this abnormal substrate is associated with SCN5A mutations and multigenic variants.
JACC-CLINICAL ELECTROPHYSIOLOGY
(2023)
