Results 81 to 90 of about 165,314 (216)

Posicionamento ectópico de eletrodo de marcapasso Posicionamiento ectópico de electrodo de marcapaso Ectopic positioning of pacemaker electrode

Arquivos Brasileiros de Cardiologia, 2010
Apresentamos o caso de um paciente portador da forma cardíaca da doença de Chagas com disfunção ventricular esquerda e bloqueio atrioventricular de 2º grau Mobitz II, associados a vários episódios de síncope.
Gildo Mota, Juliana Prazeres, Nelmacy Freitas, Luiz Magalhães, Francisco Reis, Roque Aras   +5 more
doaj   +1 more source

A generalized model of active media with a set of interacting pacemakers: Application to the heart beat analysis [PDF]

arXiv, 2005
We propose a quite general model of active media by consideration of the interaction between pacemakers via their phase response curves. This model describes a network of pulse oscillators coupled by their response to the internal depolarization of mutual stimulations.
arxiv  

The Neglected Parameter: Tricuspidal E Wave Deceleration Time as Predictor of Atrioventricular Synchrony in VDD Leadless Pacemakers

Journal of Cardiovascular Electrophysiology, EarlyView.
ABSTRACT Leadless pacemakers as the Medtronic Micra AV, have improved cardiac pacing by reducing complications associated with traditional systems. However, achieving high atrioventricular synchrony (AVS) remains a challenge, especially in patients with a high pacing burden.
Mattia Strazzanti, Caterina Maffeis, Luca Tomasi, Sofia Capocci, Bruna Bolzan, Elena Franchi, Flavio Luciano Ribichini, Giacomo Mugnai   +7 more
wiley   +1 more source

Acute Cervical Vagus Nerve Stimulation Modulates Gastric Slow Waves in the Distal Rat Stomach

Neurogastroenterology &Motility, EarlyView.
Slow waves were mapped on the rat gastric serosa during acute cervical vagus nerve stimulation with three stimulation protocols. The medium and high cVNS protocols modified slow wave frequency, and slow wave propagation was temporarily disrupted during stimulation in all subjects.
Omkar N. Athavale, Recep Avci, Alys R. Clark, Leo K. Cheng, Peng Du   +4 more
wiley   +1 more source

Determinants of cardiac output in health and heart failure

Experimental Physiology, EarlyView.
Abstract Sustained physical exercise depends on delivery of oxygenated blood to exercising muscle. At least among healthy individuals, bulk transport of blood is tightly matched to metabolic demand, such that cardiac output increases by ∼6 L/min for every 1 L/min increase in oxygen uptake. Multiple factors contribute to the regulation of cardiac output,
Ibrahim Ainab, Natalie Van Ochten, Emmett Suckow, Kathryn Pierce, Chelsea Arent, Joseph Kay, Lindsey M. Forbes, William K. Cornwell III   +7 more
wiley   +1 more source

Bloqueio atrioventricular no pós-operatório de cirurgia cardíaca valvar: incidência, fatores de risco e evolução hospitalar Atrioventricular block in the postoperative period of heart valve surgery: incidence, risk factors and hospital evolution

Brazilian Journal of Cardiovascular Surgery, 2011
INTRODUÇÃO: Distúrbios do sistema de condução cardíaco são complicações potenciais e conhecidas dos procedimentos de cirurgia cardíaca valvar. OBJETIVOS: Investigar a associação entre fatores peri-operatórios com bloqueio atrioventricular (BAV) e a ...
Andres Di Leoni Ferrari, Carolina Pelzer Süssenbach, João Carlos Vieira da Costa Guaragna, Jacqueline da Costa Escobar Piccoli, Guilherme Ferreira Gazzoni, Débora Klein Ferreira, Luciano Cabral Albuquerque, Marco Antonio Goldani   +7 more
doaj   +1 more source

Microgravity‐induced changes in skeletal muscle and possible countermeasures: What we can learn from bed rest and human space studies

Experimental Physiology, EarlyView.
Abstract Despite exercise countermeasures to sustain health and performance in spaceflight, complete maintenance of muscle mass and functions in microgravity is still not possible for most astronauts. The principal cause of the limited effectiveness of existing exercise countermeasures is the difficulty in achieving full loading forces in space.
Alessandra Bosutti, Bergita Ganse, Nicola A. Maffiuletti, Rob C. I. Wüst, Gustav J. Strijkers, Andy Sanderson, Hans Degens   +6 more
wiley   +1 more source

Determining properties of human‐induced pluripotent stem cell‐derived cardiomyocytes using spatially resolved electromechanical metrics

The Journal of Physiology, EarlyView.
Abstract figure legend In this study, we use human‐induced pluripotent stem cell‐derived cardiomyocyte (hiPSC‐CM) experiments and computational modelling to identify the mechanism of action of drug compounds. In the hiPSC‐CM experiments, optical measurements of cell collections are recorded in the baseline case and after drug exposure.
Karoline Horgmo Jæger, Verena Charwat, Kevin E. Healy, Samuel Wall, Aslak Tveito   +4 more
wiley   +1 more source

Advancing Myocardial T1 Mapping: A Comparative Study of the Frequency‐Independent MFA Sequence and Standard MOLLI

NMR in Biomedicine, Volume 38, Issue 5, May 2025.
The multiflip angle (MFA) sequence provides a frequency‐independent and motion‐robust alternative to the MOLLI sequence for myocardial T1 mapping. Although MOLLI demonstrated higher measurement precision, it showed heart rate dependency and sex‐related differences in T1 values. In contrast, MFA maintained stable T1 values across varying heart rates and
Vitali Koch, Mukaram Rana, Christina Seppi, Simon Martin, Thomas Vogl, David M. Leistner, Marco M. Ochs, Sebastian M. Haberkorn   +7 more
wiley   +1 more source

A Beating‐Heart Procedure with Soft Robotic Guidance

Advanced Robotics Research, Volume 1, Issue 1, April 2025.
Robot‐assisted pacemaker lead placement through the coronary sinus enabled cardiac pacing in multiple in vivo studies. When compared with conventional clinical tools, the robot reduced procedural time, duration of harmful radiation exposure, and the possibility of tissue damage.
Jacob Rogatinsky, Dominic Recco, Manisha Singh, Leonardo Zamora Yañez, Grace Matthews, Brian Ayers, Edward O’Leary, Ellen T. Roche, David Hoganson, Tommaso Ranzani   +9 more
wiley   +1 more source