| A radiofrequency transseptal needle: initial animal studies. | |
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MedLine Citation:
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PMID: 20506170 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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OBJECTIVES: The objective of this study was to demonstrate the safety and efficacy of a new transseptal needle design with a radiofrequency (RF) tip combined with the ease of use of the needle configuration. Background: RF transseptal puncture to enter the left heart, with a RF wire-catheter system is a successful technique in patients with complex access using a standard transseptal needle. METHODS: The RF transseptal needle (NRG™ Transseptal Needle; Baylis Medical, Montreal, Canada) was designed for RF percutaneous transseptal access to the left heart. Eight pigs underwent transvenous cardiac catheterization with baseline intracardiac electrograms and right atrial pressure waveforms. Transseptal RF puncture was performed followed by left atrial pressure waveform monitoring. RESULTS: An intracardiac electrogram was recorded in each animal while dragging the needle tip from the superior caval vein across the atrial septum and into the inferior caval vein. Contrast staining of the atrial septum was accomplished in all animals, with subsequent RF septal puncture. After 0.1 sec, impedance increased from 300 to 1,200 Ohms with the creation of a vapor layer, and voltage increased steadily to a threshold of 230 volts over the first 0.4 sec. This dielectric breakdown results in tissue vaporization and tissue perforation. The needle's location within the left atrium was confirmed by the pressure waveform and contrast injection. Repeated RF punctures with the NRG™ was compatible with various manufactures transseptal sheaths. CONCLUSION: RF puncture of the interatrial septum using the NRG™ Transseptal Needle facilitates an alternative effective technique to enter the left atrium. © 2010 Wiley-Liss, Inc. |
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Authors:
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Matthew A Crystal; Mahmood A Mirza; Lee N Benson |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions Volume: 76 ISSN: 1522-726X ISO Abbreviation: Catheter Cardiovasc Interv Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100884139 Medline TA: Catheter Cardiovasc Interv Country: United States |
Other Details:
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Languages: eng Pagination: 769-73 Citation Subset: IM |
Affiliation:
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Department of Pediatrics, The University of Toronto School of Medicine, Toronto, Ontario, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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