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Removal of Spontaneously Fractured Leads with Their Proximal Ends in the Heart and Vasculature-Description of Different Approaches and Tools.
J Clin Med
January 2025
Department of Cardiac Surgery, The Pope John Paul II Province Hospital of Zamość, 22-400 Zamosc, Poland.
Removal of spontaneously fractured leads with their proximal ends migrated into the vascular space has not been analysed in detail thus far. The study aimed to compare the effectiveness of different approaches and auxiliary tools for removing fractured leads with migrated proximal ends. Retrospective analysis of 72 cases from a database containing 3847 TLEs (transvenous lead extraction).
View Article and Find Full Text PDFBioinspired balloon catheter integrated with stretchable "flounder" electrodes under high voltage for uniform pulsed field ablation.
Sci Adv
December 2024
Laboratory of Flexible Electronics Technology, Tsinghua University, Beijing, 100084, China.
Atrial fibrillation leads to severe diseases such as heart failure and strokes. While catheter ablation is prevalent for the treatment, existing techniques hardly can achieve both tissue selectivity and ablation uniformity. Here, we propose a bioinspired strategy for balloon-based pulsed field ablation (PFA) systems based on "flounder" electrodes.
View Article and Find Full Text PDFNon-invasively measured myocardial torsional modulus: Comparison to invasive evaluation of diastolic function.
J Cardiovasc Magn Reson
December 2024
Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA; Birmingham Veterans Affairs Medical Center, Birmingham, Alabama, USA. Electronic address:
Background: Left ventricular (LV) diastolic function is a key determinant of cardiac output and impairments of diastolic function can lead to heart failure. Assessment of diastolic function is challenging due to several factors, including the load dependence of ventricular filling. We developed a method using cardiovascular magnetic resonance (CMR) imaging to model the untwisting motion of the LV as a viscoelastic damped oscillator to derive myocardial torsional modulus (µ) and frictional damping characteristics, and hypothesized that the torsional modulus would correlate with invasive measures of LV stiffness.
View Article and Find Full Text PDFA Rare Case of Shunt Malfunction Due to the Needle Guard Coming Off During Ventriculoperitoneal Shunt Surgery.
Cureus
October 2024
Neurosurgery, Kawasaki Municipal Tama Hospital, Kawasaki, JPN.
We report a rare case of shunt valve failure due to obstruction during ventriculoperitoneal (VP) shunt surgery for hydrocephalus after subarachnoid hemorrhage due to aneurysm rupture. The hydrocephalus shunt surgery was started normally, and there was no bending or twisting of the valve, nor blood contamination. However, after irrigation of the shunt valve, the shunt valve obstructed and malfunctioned before catheter connection and insertion into the subcutaneous space.
View Article and Find Full Text PDFMechanisms underlying the spontaneous termination of torsades de pointes in an experimental model of long QT syndrome.
Heart Rhythm
October 2024
Department of Cardiology II (Electrophysiology), University Hospital Münster, Munster, Germany.
Article Synopsis
- Torsade de pointes (TdP) is a type of ventricular tachycardia characterized by complex and self-terminating heart rhythms, with underlying mechanisms for its abrupt stop not fully understood.
- The study analyzed episodes of TdP using isolated rabbit hearts under conditions that prolonged the QT interval, revealing shifts in the action potential duration and repolarization dispersion leading to spontaneous termination of TdP.
- The key finding indicated that a sudden decrease in spatial dispersion and changes in action potential configuration are crucial predictors for the cessation of TdP, suggesting that normalization of myocardial repolarization plays a significant role in its termination.
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