Zobrazeno 1 - 10
of 57
pro vyhledávání: '"V.R. Vorperian"'
Publikováno v:
IEEE Transactions on Biomedical Engineering. 50:218-223
Radio-frequency (RF) cardiac catheter ablation has been very successful for treating some cardiac arrhythmias, however, the success rate for ventricular tachycardias is still not satisfactory. Some existing methods for developing deeper lesions inclu
Autor:
Fred T. Lee, Hong Cao, Supan Tungjitkusolmun, Dieter Haemmerich, Jang-Zern Tsai, John G. Webster, Stephen T. Staelin, V.R. Vorperian, David M. Mahvi
Publikováno v:
IEEE Transactions on Biomedical Engineering. 49:3-9
Radio-frequency (RF) hepatic ablation, offers an alternative method for the treatment of hepatic malignancies. We employed finite-element method (FEM) analysis to determine tissue temperature distribution during RF hepatic ablation. We constructed th
Autor:
V.R. Vorperian, Jan-Zern Tsai, Dieter Haemmerich, J.G. Webster, Supan Tungjitkusolmun, Young Bin Choy, Hong Cao
Publikováno v:
IEEE Transactions on Biomedical Engineering. 48:425-433
This study investigated the flow effect on the lesion formation during radio-frequency cardiac catheter ablation in temperature-controlled mode. The blood flow in heart chambers carries heat away from the endocardium by convection. This cooling effec
Autor:
V.R. Vorperian, Hong Cao, J.A. Will, J. Z. Tsai, Supan Tungjitkusolmun, Eung Je Woo, J.G. Webster
Publikováno v:
IEEE Transactions on Biomedical Engineering. 47:23-31
Radio-frequency (RF) cardiac ablation has been very successful for treating arrhythmias related with atrioventricular junction and accessory pathways with successful cure rates of more than 90%. Even though ventricular tachycardia (VT) is a more seri
Publikováno v:
IEEE Transactions on Biomedical Engineering. 47:1518-1524
While most commercial ablation units and research systems can provide catheter tip temperature during ablation, they do not provide information about the temperature change inside the myocardium, which determines the lesion size. The authors present
Publikováno v:
IEEE Transactions on Biomedical Engineering. 47:41-48
The apparent resistance of a finite-thickness layer measured with a four-electrode plunge probe depends on the electrode insertion depth, electrode spacing, and layer thickness, as well as the resistivity ratio of an underlying layer. A physical mode
Publikováno v:
IEEE Transactions on Biomedical Engineering. 47:32-40
The high current density at the edge of a metal electrode causes hot spots, which can lead to charring or blood coagulation formation during radio-frequency (RF) cardiac ablation. We used finite element analysis to predict the current density distrib
Publikováno v:
Journal of Cardiovascular Electrophysiology. 10:836-843
Electrophysiologic Effects of Astemizole Metabolites. Introduction: The selective H1-receptor antagonist astemizole (Hismanal) causes acquired long QT syndrome. Astemizole blocks the rapidly activating delayed rectifier K+ current IKr and the human e
Publikováno v:
Journal of the American College of Cardiology. 30:791-798
We sought to assess the odds of experiencing adverse effects with low dose amiodarone therapy compared with placebo.An estimate of the likelihood of experiencing amiodarone-related adverse effects with exposure to low daily doses of the drug is lacki
Autor:
Craig T. January, Timothy J. Hoon, Christian Studenik, Zhengfeng Zhou, V.R. Vorperian, Saeed Mohammad
Publikováno v:
Journal of the American College of Cardiology. 28(6):1556-1561
Objectives. Proarrhythmic effects have been observed with the selective histamine1 (H1) receptor antagonist drug astemizole, a widely prescribed antihistamine. The metabolites of astemizole and those of other antihistamine compounds have not been imp