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Elad Anter, Cory M Tschabrunn, Alfred E Buxton, Mark E Josephson
BACKGROUND: In vivo description of ventricular tachycardia (VT) circuits is limited by insufficient spatiotemporal resolution. We used a novel high-resolution mapping technology to characterize the electrophysiological properties of the postinfarction reentrant VT circuit. METHODS: In 15 swine, myocardial infarction was induced by left anterior descending artery balloon occlusion. Animals were studied 6 to 8 weeks after myocardial infarction. Activation mapping of VTs was performed by using the Rhythmia mapping system...
July 26, 2016: Circulation
Christian Sohns, Ardan M Saguner, Christine Lemes, Francesco Santoro, Shibu Mathew, Christian Heeger, Bruno Reißmann, Tilman Maurer, Johannes Riedl, Thomas Fink, Kentaro Hayashi, Feifan Ouyang, Karl-Heinz Kuck, Andreas Metzner
BACKGROUND: The Rhythmia mapping system was recently launched and allows for rapid ultra-high-resolution electroanatomical mapping. We evaluated the feasibility, acute efficacy and safety of this novel system for ablation of atrial fibrillation (AF) and left atrial (LA) tachycardia (AT). METHODS AND RESULTS: A total of 35 consecutive patients (age 64.3 ± 8.6 years, LA diameter 44.4 ± 5.8 mm) underwent catheter ablation for AF and/or AT. All procedures were performed using Rhythmia in conjunction with the Orion mini-basket catheter...
June 11, 2016: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
Elad Anter, Thomas H McElderry, Fernando M Contreras-Valdes, Jianqing Li, Patricia Tung, Eran Leshem, Charles I Haffajee, Hiroshi Nakagawa, Mark E Josephson
BACKGROUND: Rhythmia is a new technology capable of rapid and high-resolution mapping. However, its potential advantage over existing technologies in mapping complex scar-related atrial tachycardias (ATs) has not yet been evaluated. OBJECTIVE: The purpose of this study was to examine the utility of Rhythmia for mapping scar-related ATs in patients who had failed previous ablation procedure(s). METHODS: This multicenter study included 20 patients with recurrent ATs within 2 years after a previous ablation procedure (1...
October 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Decebal Gabriel Latcu, Sok-Sithikun Bun, Nadir Saoudi
No abstract text is available yet for this article.
June 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Elad Anter, Cory M Tschabrunn, Fernando M Contreras-Valdes, Jianqing Li, Mark E Josephson
BACKGROUND: During pulmonary vein isolation (PVI), a circular lasso catheter is positioned at the junction between the left atrium (LA) and the pulmonary vein (PV) to confirm PVI. The Rhythmia mapping system uses the Orion mini-basket catheter with 64 electrodes instead of the lasso catheter. However, its feasibility to determine PVI has not been studied. OBJECTIVE: The purpose of this study was to compare signals between the mini-basket and lasso catheters at the LA-PV junction...
September 2015: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Anees Thajudeen, Warren M Jackman, Brian Stewart, Ivan Cokic, Hiroshi Nakagawa, Michael Shehata, Allen M Amorn, Avinash Kali, Ezh Liu, Doron Harlev, Nathan Bennett, Rohan Dharmakumar, Sumeet S Chugh, Xunzhang Wang
BACKGROUND: Endocardial mapping for scars and abnormal electrograms forms the most essential component of ventricular tachycardia ablation. The utility of ultra-high resolution mapping of ventricular scar was assessed using a multielectrode contact mapping system in a chronic canine infarct model. METHODS: Chronic infarcts were created in five anesthetized dogs by ligating the left anterior descending coronary artery. Late gadolinium-enhanced magnetic resonance imaging (LGE MRI) was obtained 4...
June 2015: Pacing and Clinical Electrophysiology: PACE
Andreas Bollmann, Sebastian Hilbert, Silke John, Jedrzej Kosiuk, Gerhard Hindricks
AIMS: Although sinus node modification by catheter ablation is an established therapy for the treatment of inappropriate sinus tachycardia, there is incomplete understanding of sinus node anatomy and function but also limited electroanatomical mapping data. Recently, an automatic, ultra high-resolution mapping system has been presented to accurately and quickly identify right atrial (RA) geometry and activation patterns but detailed assessment of sinus node activation has not been performed which was one aim of this study...
March 2015: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
C Reynoso, N Crespo-Eguílaz, J L Alcázar, J Narbona
INTRODUCTION: The aim of this research is to contribute to knowledge of the normal spontaneous motor behavior of the human fetus during the second trimester of pregnancy. This study focuses on five patterns of spontaneous fetal movement: startle (S), axo-rhizomelic rhythmia (ARR), axial stretching (AS), general movement (GM), and diaphragmatic contraction (DC). METHODS: A cohort of 13 subjects was followed up using 2D obstetrical ultrasound images at 12, 16, 20, and 24 weeks of gestation...
March 2015: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
Hiroshi Nakagawa, Atsushi Ikeda, Tushar Sharma, Ralph Lazzara, Warren M Jackman
BACKGROUND: A canine right atrial (RA) linear lesion model was used to produce a complex pattern of RA activation to evaluate a novel mapping system for rapid, high resolution (HR) electroanatomical mapping. METHODS AND RESULTS: The mapping system (Rhythmia Medical, Incorporated) uses an 8F deflectable catheter with a minibasket (1.8 cm diameter), containing 8 splines of 8 electrodes (total 64 electrodes, 2.5 mm spacing). The system automatically acquires electrograms and location information based on electrogram stability and respiration phase...
April 2012: Circulation. Arrhythmia and Electrophysiology
Can Zheng, Meihua Li, Masashi Inagaki, Toru Kawada, Kenji Sunagawa, Masaru Sugimachi
Our previous study showed that chronic vagal stimulation (VS) prevented the cardiac remodeling and improved the prognosis of chronic heart failure (CHF) rats after large myocardial infraction (MI). Antiarrhythmic effects of VS were assumed to produce such a beneficial outcome. There-rhythmias. fore, we examined the effects of VS on cardiac ar- The ECG transmitter and a radio-controlled stimulator were implanted in the healed MI rat (n=8). The electrical stimulation of the right cervical vagus started at 3-5 months after MI and lasted for 7 days...
2005: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
No abstract text is available yet for this article.
March 1962: Srpski Arhiv za Celokupno Lekarstvo
Roberto Horacio Caraballo, Natalio Fejerman, Bernardo Dalla Bernardina, Victor Ruggieri, Ricardo Cersósimo, Carlos Medina, Juan Pociecha
Spasms are defined as epileptic seizures characterized by brief axial contraction, in flexion, extension or mixed, symmetric or asymmetric, lasting from a fraction of a second to 1-2s, and are associated with a slow-wave transient or sharp and slow-wave complex, followed or not by voltage attenuation. Epileptic spasms usually appear in clusters and are age-dependent. This type of epileptic spasms associated with the particular EEG pattern, hypsar rhythmia, constitutes the basis for the diagnosis of West syndrome...
June 2003: Epileptic Disorders: International Epilepsy Journal with Videotape
A D Krahn, G J Klein, R Yee, A C Skanes
Syncope is a complex clinical syndrome with multiple etiologies that can be very difficult to diagnose. The major obstacles to diagnosis are the periodic and unpredictable nature of events and the high spontaneous remission rate. Conventional testing is often unproductive in patients when initial non-invasive testing is negative, particularly when a paroxysmal ar-rhythmia is suspected. Holter monitoring is often employed initially, with limited utility. Holter monitoring provides a rhythm profile, but rarely achieves the gold standard of a symptom rhythm correlation...
February 2003: Minerva Cardioangiologica
F R Ames, D Saffer
The stereotyped, episodic abnormal behaviour manifested by a child and her mother on exposure to a particular sort of sunlight is described in detail. The child is the first fully documented patient with this so-called "self-induced" form of photosensitive epilepsy in whom for several years no electroencephalographic sensitivity to flickering light could be demonstrated. The probability that the cingulate circuit may be the anatomical substrate involved in the pathogenesis of these patients' unusual response to sunlight is discussed...
April 1983: Journal of the Neurological Sciences
J Yang, G Xu, Q Zhang, W Liu, Y Gou
In fasting and anaesthetic rabbits, the experimental model of gastric dysrhythmia could be produced by electric stimulation of inferior phrenicus vagus and splanchnic nerve for innervation of corpus and antrum, or by left gastric artery infusion of Adr, Ach and glucagon at a steady velocity. The results were as follows: (1) Electrical stimulation of inferior phrenicus vagus at low frequency and intensity could increase the frequency and amplitude of basic electric rhythmia (BER) or slow wave (P less than 0...
1990: Zhen Ci Yan Jiu, Acupuncture Research
N V Kaverina, Z P Senova, V V Lyskovtsev
The antiarrhythmic activity of some acyl derivatives of phenothiazine was studied. Ethmozine proved to be the most effective among them. It produced a marked antiarrhythmic effect both in experiments and in the clinic. The effect of ethmozine is similar to that of quinidine, but it has a wider therapeutic range and is less toxic. The drug has practically no effect or arterial pressure, myocardial conduction and myocardial contraction. These properties of ethmozine as well as its ability to prolong the refractory period and reduce myocardial excitability allow it to be recommened for the management of tachyarrhythmic a-rhythmia...
April 1978: Kardiologiia
E Vormittag
13 male patients suffering from arteriosclerotic heart disease and/or arterial hypertension were monitored continuously before and after vascular surgical procedures using an arrhythmia computer. Heart rate, paroxysmal supraventricular tachycardias, ventricular extrasystoles, ventricular tachycardias, ventricular fibrillation and prematurity index (QnQe/QTn) were recorded numerically. Ventricular arrhythmias were detected as follows preoperatively in 12 patients, after operation in all patients, paired ventricular extrasystoles or episodes of ventricular tachycardia were found in 5 cases before and in 7 after operation, ventricular fibrillation in one case...
August 1978: Der Anaesthesist
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