Atrial tachycardia originating from the left coronary cusp near the aorto-mitral junction: Anatomic considerations

Heart Rhythm Center, the Heart Institute, Cedars-Sinai Health System, Los Angeles, California 90048, USA.
Heart rhythm: the official journal of the Heart Rhythm Society (Impact Factor: 5.08). 03/2010; 7(7):987-91. DOI: 10.1016/j.hrthm.2010.03.017
Source: PubMed
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Available from: Tong Liu, Jan 05, 2014
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    • "In our case, the P waves were not as narrow as those of AT originating from the His-bundle region. This finding was consistently observed in the cases reported by Shehata, et al.9 and might be caused by a more left-sided location than an HB-region tachycardia. "
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    ABSTRACT: Atrial tachycardia (AT) originating from the aortomitral junction is a very rare and challenging disease. Its arrhythmic characteristics have not been described in detail compared with the descriptions of the arrhythmic characteristics of AT originating from the other locations. Only a few case reports have documented successful ablation of this type of AT using transaortic or transseptal approaches. We describe a case with AT that was resistant to right-sided ablation near the His bundle failed and transaortic ablation at the aortomitral junction successfully eliminated.
    Full-text · Article · Mar 2014 · Yonsei medical journal
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    • "In this case, RF energy delivered from the NCC temporarily terminated the AT with a variable cycle length, and may have been located in close proximity to the AT focus in that area. As an anatomical consideration, the right atrial myocardium behind the NCC extends from the His-bundle region to a superior site of the tendon of Todaro, which is slightly anterior to the interatrial septum[8]. This AT is likely to have originated from the mitral annulus– aorta junction (M–Ao junction)[4]. "
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    ABSTRACT: Here we report a case of adenosine-sensitive focal atrial tachycardia that was successfully ablated from the left atrium at a site located adjacent to the posterior site of the left coronary cusp in spite of failed ablations from the superior-septal right atrium and non-coronary aortic cusp. In the case of an unsuccessful ablation from the right superoseptum and non-coronary aortic sinus, the left atrial septum represents a potential optional site for ablation. © 2013 Japanese Heart Rhythm Society. Published by Elsevier B.V. All rights reserved.
    Full-text · Article · Jan 2013 · Journal of Arrhythmia
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    ABSTRACT: This paper presents a laboratory testing of genetic algorithm (GA) based self-tuned PI controller for the speed control of interior permanent magnet synchronous motor (IPMSM). A radial basis artificial neural network function is used for on-line tuning of the PI controller. GA has been used in this work in order to obtain the optimized values of the PI constants for precise speed control. An performance index has been developed using GA, whose minimum value ensures zero steady-state error, minimum speed deviation and minimum settling time of the IPMSM drive. The initial values of the radial basis function network (RBFN) are obtained through off-line learning. Training data for off-line learning are generated by simulating the IPMSM drive under various operating conditions and uncertainties. For on-line implementation, the PI constants are tuned by updating the parameters of the RBFN maintaining the genetic performance index at its minimum value. In real time implementation, the proposed controller has been realized using a digital signal processor (DSP) board DS1102 for a 1hp laboratory IPMSM. The control algorithm is written in C++, compiled and then down loaded to the DSP board. The agreement between the simulation and test results confirms the effectiveness of the proposed controller for the vector control of the IPMSM.
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