Super-selective electrical stimulation of the left ventricle via a miniaturized magnetized stimulation wire: proof of concept study
| Autor: | Patrick Schauerte, Thomas Schimpf, Karl Mischke, Christian Knackstedt, Boerge Wessling, Christine Rothe, Andreas Napp, Uwe Schnakenberg |
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| Rok vydání: | 2010 |
| Předmět: |
Chronaxie
Materials science medicine.medical_treatment Biomedical Engineering Cardiac resynchronization therapy Pilot Projects Tortuosity Sensitivity and Specificity Ventricular Function Left Magnetics Heart Conduction System Miniaturization medicine Animals Cardiac Resynchronization Therapy Devices Sheep Equipment Design equipment and supplies Electrodes Implanted Equipment Failure Analysis Rheobase Magnet Electrode Biomedical engineering |
| Zdroj: | Biomedizinische Technik. Biomedical engineering. 55(5) |
| ISSN: | 1862-278X |
| Popis: | Cardiac resynchronization therapy provides a treatment option for patients with congestive heart failure. Electrodes are usually advanced via the cardiac venous system (CVS). Placement is often hampered by small vessel diameter or tortuosity. The aim of this study was to develop and test a magnetized stimulation wire (MSW) capable of being navigated into small and tortuous CVS branches. Therefore, a conventional guide wire with a permanent magnet and a single stimulation electrode at its tip was coated with iridium oxide at the distal end and insulated except for the very tip (coating thickness: 500 nm, active uncoated area: 10 mm(2)). The MSW was designed to allow for a remote magnetic steering using a magnetic navigation system (MN) (Stereotaxis™). After in vitro testing of the electrical properties, the MSW was tested in an animal model (n=6 sheep): the MSW was placed in a CVS side branch and navigation characteristics of the MSW were determined. The effective (unipolar) pacing threshold was 4.9±2.4 V (at 2 ms pulse width). The rheobase was 1.89±0.44 V and the chronaxie time was 0.75±0.7 ms. The MSW could be navigated into small CVS branches with reasonable MN properties. This could allow stimulation at CVS sites currently not accessible for conventional stimulation catheters or electrodes. |
| Databáze: | OpenAIRE |
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