Remote magnetic navigation: Difference between revisions
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#REDIRECT [[Robotic magnetic navigation]] |
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==Remote Magnetic Navigation== |
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'''Remote Magnetic Navigation''', employed by companies such as Stereotaxis[http://www.stereotaxis.com], is an emerging technology in interventional [[cardiology]]. [[Catheter]]s with magnetic tips can be steered within the patient, without the need for an [[electrophysiologist]] to maneuver the catheter or guidewire placement manually. Unlike other robotic navigation techniques, the catheter is controlled by steering the distal tip with a magnetic field, making perforations virtually impossible.<ref>Professor Luc Jordaens: http://www.escardio.org/congresses/esc2008/news/Pages/robotic-navigation-systems.aspx</ref> The engineering was developed at the [[University of Virginia]], and the patent rights were later acquired by Stereotaxis, Inc. to market and develop a magnetic navigation system, according to its 2005 10-K filing with the SEC.<ref>http://library.corporate-ir.net/library/17/179/179896/items/206241/StereotaxisInc10K.pdf</ref> The technology has been proven to reduce physician and patient exposure to radiation and procedure times, as well as enable more precise navigation of the vasculature with increased safety and efficacy.<ref>Pappone, C and Santenelli, V.: http://www3.interscience.wiley.com/cgi-bin/fulltext/117990623/HTMLSTART</ref> |
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Traditional catheter labs in hospitals rely on the manual placement and steering of catheters by a physician. In interventional cardiology, catheters are used to map the cardiovascular system and to correct [[arrhythmia]]s and [[atrial fibrillation]], among other heart related problems, through a variety of methods including [[ablation]]. The patient is placed under a flouroscopic system, such as a C-arm, to give the EP real-time feedback on the positioning of the catheter. In manual procedures, the physician must wear a lead apron due to radiation exposure, whereas with RMN, the doctor can conduct the procedure in a shielded room or at another location via a network connection. Then ablation catheters are used to burn scars in heart tissue to correct irregular rhythms. Apart from ablation, cardiologists use guide wires and catheters to place stents and other devices in the anatomy. |
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Remote magnetic navigation operates by using two large magnets placed on either side of the patient, and alterations in the magnetic field produced by the magnets deflects the tips of catheters within the patient to the desired direction.[http://www.stereotaxis.com/files/videomodule/@random44e629cb10050/animated_mag_still.jpg] The EP operates the catheter placement and direction in a shielded room with screens and a joystick. The catheter itself is advanced by the joystick, instead of the physician's hands. Stereotaxis offers software which enables automated mapping and other advantages through its Navigant suite. Due to the lack of irrigated catheters, completing ablation procedures with magnetic navigation has been difficult, especially in the left atrium. Magnetic irrigated catheters for Stereotaxis's Niobe MNS have been recently approved by the FDA on February 26th 2009, and the catheters have been commercially available in Europe since November, 2008. Dr. Andrea Natale remarked that the new magnetic irrigated catheters are "revolutionary" for the treatment of arrhythmias.<ref> TCAI Press Release, March 3rd, 2009: http://news.prnewswire.com/ViewContent.aspx?ACCT=109&STORY=/www/story/03-03-2009/0004982135&EDATE </ref> It is unclear what kind of procedure Dr. Natale performed and if it was included within the FDA approved procedures. [http://www.stereotaxis.com/Press-Room/Press-Releases/] As of January 2009, 18,000 total clinical cases were performed by magnetic navigation acccording to Stereotaxis´s website, with a complication rate of less than 0.1%, representing a minute fraction of complications occurring with manual and other robotic navigation systems. The Niobe has yet to report an instance of perforation during a procedure. The long term success, 6 month to 1 year, after ablation and cost effectivness has yet to been approved by multicenter trials. |
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Installing an MNS may require that the catheter lab be equipped with steel plates and specialized equipment to prevent the magnetic fields from interfering with other equipment. Such installations can be costly and time consuming. According to the company, over 100 units have been installed worldwide, including the Cleveland Clinic, UCSF, the University of Michigan, Beth Israel, Kansas University Medical, Swedish Heart Hospital, Columbia Presbyterian, NYU and several hospitals in Europe, with close to 60 systems in the company's backlog. Due to the cost of the systems and the need to outfit catheter labs for magnetic fields, product adoption has been slow but accelerating. |
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==Clinical Data & Efficacy== |
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The increased safety, reduced radiation exposure and shortened procedure times are well-documented in the literature; the efficacy of the system with non-irrigated ablation catheters remains contested against results from manual ablation procedures due to charring on catheter tips.<ref> Preminger et al, 2009. HRS 2009 Abstract: Early Experience With Remote Magnetic Navigation Ablation of Cavo-Tricuspid Isthmus: Potential Limitations. St.Luke's-Roosevelt Hospitals, New York, NY. </ref> Procedures with the newly launched, second-generation irrigated catheters currently demonstrate superior safety, efficacy and procedure time metrics compared to manual and other robotic techniques (publications listed below). Additionally, magnetic navigation has been found to reduce procedure times and costs for hospitals in AVNRT cases.<ref> Szili-Torok et al, 2009. HRS 2009 Abstract: Outpatient Single Catheter Ablation of the Slow Pathway in AVNRT Using Remote Magnetic Navigation is Cost-effective. Erasmus MC, Rotterdam, Netherlands</ref> |
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Currently, there are three main ablation catheters available with the Stereotaxis system, all created with Biosense Webster. They include 4 millimeter and 8 millimeter diameter non-irrigated catheters, both of which have received FDA and CE mark approval; Biosense Webster has also recently launched in the EU and the United States a Niobe-compatible magnetic irrigated catheter, the ThermoCool RMT.<ref>November 18th Press Release from Biosense Webster: Magnetically Steered Irrigated Tip Cardiac Catheter For Treatment Of Irregular Heart Rhythms Now Available Throughout The European Union </ref> The ThermoCool RMT catheter is a member of Biosense's ThermoCool line of catheters, which have been recommended for approval in the treatment of Atrial Fibrillation by an FDA advisory panel.<ref> November 20th Press Release from Biosense Webster: FDA Advisory Panel Unanimously Recommends Approval of NAVISTAR® THERMOCOOL® Catheter for Atrial Fibrillation</ref> The ThermoCool catheters are the only ones recommended for approval by an FDA panel for the treatment of atrial fibrillation. The ThermoCool RMT catheter was not included in the recommendation since it has not been in use for enough time. Additionally, Biotronik has launched a gold-tipped magnetic irrigated catheter in Europe, and St. Jude Medical is currently developing a magnetic irrigated catheter as well. |
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There has been some clinical debate surrounding the superior efficacy of magnetic navigation relative to manual procedures for ablation with non-irrigated ablation catheters. In a paper published from the Cleveland Clinic, Di Biase et al failed to reach 40% of the target sites for ablation in a set of patients, n=45.<ref>Di Biase et al: http://content.onlinejacc.org/cgi/content/abstract/50/9/868?ijkey=6d779f4f5873a6ff2ef854d1ce4b0442014c02f5&keytype2=tf_ipsecsha</ref> The investigators cite charring on the catheter tip as a main issue preventing effective lesions using the Stereotaxis 4 mm ablation catheter. According to Dr. Bruce Lindsay, Di Biase et al used this catheter for pulmonary vein antrum isolation (PVAI) when the catheter was designed specifically for supraventricular tachycardia (SVT).<ref>Bruce, L.:http://content.onlinejacc.org/cgi/content/full/50/9/875</ref> Further, Dr. Carlo Pappone raises questions of the validity of Di Biase's study, citing that it included 20 investigators for only 45 procedures and that despite the charring concerns, they still continued to conduct the study. Pappone also stated that the investigators of the study likely used faulty techniques by applying RF too long and not aligning the catheter to the heart wall correctly.<ref>Pappone, C. and Santinelli, V.:http://content.onlinejacc.org/cgi/content/full/51/16/1614</ref> Two principals of the Di Biase study have since left the Cleveland Clincic, Dr. Andrea Natale and Dr. J. David Burkhardt, who now practice at the Texas Cardiac Arrhythmia Institute. Dr. Burkhardt is now a proponent of the Stereotaxis system as the company's chief medical officer, and TCAI has a Niobe installed. A study led by Katsiyiannis et al from the Minneapolis Heart Institute involved performing ablation on 40 patients, 20 with a manual non-irrigated catheter and 20 with the Stereotaxis 4 mm catheter. The mean procedure time for the manual procedures was 279 minutes versus 209 minutes with the magnetic catheters (p<.001). After one year 15 patients from the manual group and 16 from the magnetic group were free from atrial fibrillation. The procedures performed on the Niobe had on average 19.5 minutes of flouroscopy time, compared with 58.6 for the manual procedures.<ref>Katsiyiannis et al, 2008: |
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Magnetic navigation for atrial fibrillation ablation (HRS 2008) </ref> |
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'''Initial Experiences with the Magnetic Irrigated Catheter''' |
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During HRS 2008, European physicians presented abstracts about their initial experiences with the magnetic irrigated catheter, which was recalled in January and then relaunched in Europe in November, 2008. The studies cited below are from experience with the irrigated catheter that was pulled by Biosense Webster due to manufacturer specification issues. No studies have yet been presented with the newly launched catheter. |
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*Koektuerk et al (2008) from the Hanseatic Heart Center in Hamburg, Germany, were able to successfully block RAI in all patients with the irrigated catheter, compared to 89% of patients with the 8 mm non-irrigated catheter with "favourable procedural parameters."<ref>Koektuerk et al, 2008. Remote controlled catheter ablation of typical atrial flutter: A preliminary comparison of the magnetic 8 mm tip catheter versus the novel 3.5 mm irrigated tip magnetic catheter</ref> |
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*Reddy et al (2008) investigated the use of the irrigated catheter in left-side ablation in 11 patients, eight of which were classified as atrial fibrillation, one as macroreentrant AT, and two as scar-related VT. All PVs were remotely isolated in the AF group, and the only unsuccessful ablation occurred with a deep-septal VT circuit.<ref>Reddy et al, 2008. First Experience Using a Remote Magnetically-Driven Irrigated Catheter for Left-Sided Ablation (HRS 2008) </ref> |
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*Dr. Carlo Pappone was able to successfully disconnect PVs in all 33 patients in his study without any major complications. In one case, he did find charring on the catheter. He stated, "Navigation and mapping was more challenging with irrigated-tip than with solid magnetic catheters probably due to their different architecture. Being hollow inside, the magnets used at the tip are smaller potentially reducing their responsiveness to the magnetic field. No major complications occurred during and after the procedure." <ref>Pappone et al, 2008. First human experience with an irrigated tip catheter for remote circumferential pulmonary vein ablation. Preliminary results in 33 patients with atrial fibrillation (HRS 2008) </ref> |
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'''The Relaunched Irrigated Catheter''' |
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*According to presentations at the Boston Atrial Fibrillation Symposium 2009, the magnetic irrigated catheter achieved a 95% acute success rate, with the procedures distributed as the following: CLAA (72%), VT (7%), SVT (9%), and AF (12%). Of the 127 complex left atrial fibrillation procedures, 97% (123) achieved acute success, with zero complications. The mean procedure time was 91 minutes, with an average flouroscopy time of 16 minutes. Of the entire sample of 170, one patient observed a late pericardial tamponade (0.3%). |
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Despite his early criticism of the first version of the irrigated catheter, Dr. Pappone was more impressed with the relaunched version: "I am delighted with the results of my first procedures performed successfully with the newly available Biosense magnetic irrigated catheter. I am extremely happy with its performance, and believe that Biosense did an excellent job. Contact stability, lesion quality and overall mechanical performance are excellent, and I believe safety is likely to be exemplary."<ref>Stereotaxis Press Release, September 8th, 2008: Stereotaxis Announces First Procedures Successfully Performed With Recently Re-introduced Magnetic Irrigated Catheter</ref> |
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==Similar Devices== |
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Hansen Medical offers the [[Sensei robotic catheter system]], a device utilizing a system of pulleys to steer sheaths which guide catheters. |
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Corindus, an Israeli firm, is developing a remote catheter manipulator similar to the design of the Sensei. Remote navigation is attractive since it removes the physician from the radiation used to monitor the catheter's progress. |
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A different track in the development of medical devices for ablation is to make the procedure easier to perform by development of catheters that make the lesions around each pulmonary vein in one operation. Another benefit is that no expensive imaging system is needed. Examples are: |
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Ablation Frontiers Pulmonary Vein Catheter[http://www.ablationfrontiers.com/products-OUS-pvac-pulmonary-vein-catheter.htm] |
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Bard HD Mesh Ablator Catheter [http://www.barduk.com/main/product.asp?sectionTypeId=2§ionId=16&productId=393] |
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CryoCath Arctic Front [http://www.cryocath.com/en/4.products/41.1.4.ep.eur.arctic.front.asp] |
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==Sites== |
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'''North America''' |
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*Tucson Medical Center, AZ |
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*[[Ronald Reagan UCLA Medical Center]], CA |
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*[[UCSF Medical Center]], CA |
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*[[California Pacific Medical Center]], CA |
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*Kaiser Permanente Santa Clara Medical Center - Homestead Campus, CA |
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*[[Hospital of St. Raphael]], CT |
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*St. Francis Hospital, CT |
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*Florida Hospital Cardiovascular Institute, FL |
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*[[Mount Sinai Medical Center & Miami Heart Institute]], FL |
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*University of Miami Hospital, FL |
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*Northeast Georgia Medical Center, GA |
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*Advocate Christ Medical Center, IL |
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*[[Loyola University Medical Center]], IL |
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*Northwestern Memorial Hospital, IL |
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*The University of Chicago Hospitals and Health System, IL |
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*Clarian Methodist Hospital, IN |
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*St. Mary's Medical Center, IN |
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*St. Vincent Hospital, IN |
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*[[University of Iowa Hospitals and Clinics]], IA |
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*[[The University of Kansas Hospital]], KS |
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*Central Baptist, KY |
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*Jewish Hospital, KY |
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*Boston Medical Center, MA |
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*[[Massachusetts General Hospital]], MA |
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*[[St. Elizabeth's Medical Center]], MA |
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*[[Henry Ford Hospital]], MI |
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*[[Sparrow Hospital]], MI |
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*[[University of Michigan Health System]], MI |
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*[[Abbott Northwestern Hospital]], MN |
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*[[Mayo Clinic]], MN |
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*[[Barnes-Jewish Hospital]], MO |
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*Missouri Baptist Medical Center, MO |
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*Bryan LGH, NB |
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*[[Deborah Heart and Lung Center]], NJ |
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*The Valley Hospital, NJ |
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*[[New York University Hospital]], NY |
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*[[Columbia University Medical Center]], NY |
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*Akron General, OH |
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*[[Cleveland Clinic Foundation]], OH |
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*Ohio State University Health System, OH |
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*[[Good Samaritan Hospital (Cincinnati)]], OH |
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*UH Case Medical Center, OH |
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*[[University of Oklahoma College of Medicine]], OK |
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*[[Oregon Health and Sciences University]], OR |
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*[[Penn Presbyterian Medical Center]], PA |
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*Hospital of the University of Pennsylvania |
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*[[Medical University of South Carolina]], SC |
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*[[Baptist Memorial Hospital (Memphis, Tennessee)]], TN |
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*St. Thomas Hospital, TN |
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*Parkridge Medical Center, TN |
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*[[Trinity Mother Frances Health System]], TX |
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*Providence Health Center, TX |
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*[[The Methodist Hospital]], TX |
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*Seton Medical Center, TX |
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*St. David's Medical Center Texas Cardiac Arrhythmia Institute, TX |
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*The Heart Hospital of Austin, TX |
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*[[Baylor University Medical Center]] at Irving, TX |
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*Baylor Heart and Vascular (Dallas), TX |
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*Baylor All Saints (Ft. Worth), TX |
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*Scott & White Hospital, TX |
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*Texas Children's Hospital, TX |
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*LDS Hospital, UT |
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*St. Mark's Hospital, UT |
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*[[Medical College of Virginia]], VA |
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*[[Swedish Medical Center]], WA |
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*Wisconsin Heart Hospital, WI |
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*[[University of Ottawa Heart Institute]], Ottawa, Canada |
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*[[University of Alberta Hospital]], Edmonton, Canada |
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'''Europe''' |
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*[[Allgemeines Krankenhaus]], Wien, Austria |
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*AZ Sint-Jan AV, Brugge, Belgium |
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*UZ Brussel, Belgium |
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*Na Homolce Hospital, Prague, Czech Republic |
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*[[Skejby Sygehus]], Arhus, Denmark |
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*Hjertecenter Varde, Varde, Denmark |
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*[[Rigshospitalet]], Copenhagen, Denmark |
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*Hellenski University, Finland |
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*Le Centre Hospitalier Universitaire de Bordeaux, Bordeaux, France |
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*Deutsches Herzzentrum, Munich, Germany |
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*[[Georg-August-Universitat Gottingen]], Gottingen, Germany |
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*Herz-und Diabeteszentrum NRW, Bad Oeynhausen, Germany |
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*Herz-und GeaBKlinik, Bad Neustadt, Germany |
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*Klinikum Mannheim gGmbH, Mannheim, Germany |
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*St. Georg Hospital, Hamburg, Germany |
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*Kerkoff-Klinik GmbH Hesse, Germany |
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*Herzzentrum Leipzig GmbH, Leipzig, Germany |
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*Medizinische Hochschule Hannover, Germany |
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*[[Klinikum Aachen]], Aachen, Germany |
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*Zentralklinik Bad Berka GmbH, Bad Berka, Germany |
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*[[San Raffaele Hospital]], Milan, Italy |
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*Instituto Clinico Humanitas, Milan, Italy |
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*Centre Hospitalier Princesse Grace, Monoco |
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*[[Erasmus Medical Center]], Rotterdam, Netherlands |
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*Onze Lieve Vrouwe Gasthuis, Amsterdam, Netherlands |
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*[[Bergen Hospital Trust]], Bergen, Norway |
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*Hospital Da Luz, Benfica, Portugal |
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*[[Burdenko]] Military, Moscow, Russia |
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*Hospital Clinico San Carlos, Madrid, Spain |
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*Clinica Puerta de Hierro, Madrid, Spain |
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*Arrhythmia Center Stockholm, Sweden |
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*Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland |
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*Klinik Hirslanden AG, Zurich, Switzerland |
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*[[Royal Brompton Hospital]], London, United Kingdom |
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*[[University College Hospital]], London, United Kingdom |
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'''Asia''' |
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*Beijing Anzhen Hospital, Beijing, China |
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*JiangSu Province Hospital, Nanjing, China |
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*Tokyo Women's, Tokyo, Japan |
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*King Fahad Medical City, Riyadh, Saudi Arabia |
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*St. Mary's Hospital, Seoul, South Korea |
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*SIFA Hospital, Izmir, Turkey |
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==References== |
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{{reflist}} |
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[[Category:Cardiology]] |
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[[Category:Surgical robots]] |
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[[Category:Computer assisted surgery]] |
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Latest revision as of 14:55, 20 July 2018
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