In 1987, the MAZE procedure was introduced into clinical practice by Dr. James Cox. Prior procedures included AV node ablation and other procedures that had major limitations. The clinical success of the MAZE procedure was over 90% in most series. ...

- tory. Research Interests: Areas of interest include radiofrequency ablation tech- niques arrhythmias. In the 1960s, he initi- ated arrhythmia ablation surgery with Dr. Will Sealy and worked out many and others, he developed procedures for ablating atrial fibrillation, including the Maze and ...

Atrial fibrillation (AF) is a difficult and growing problem in the population. While medical therapy controls symptoms in many patients, a proportion of individuals with this common arrhythmia cannot be optimally managed with drugs alone. However, truly curative therapy for AF has always been one of the �holy grails� of electrophysiology. The surgical maze ...

an electrode mounted on the distal end of a catheter via a vein until an endocardial location needing ablation using endocardial catheter techniques [26]. Epicardial maze procedures have been very successful, simulations were car- ried out after removing saline from the model. (Blood flow was retained, so the model

The maze procedure is the gold standard for the ablation of atrial fibrillation, and the �box lesion� around the pulmonary veins is the most important part of this procedure. We have created this lesion with a bipolar radiofrequency ablator, abandoning the usual use of this device (to ...

The maze procedure is the gold standard for the ablation of atrial fibrillation, and the "box lesion" around the pulmonary veins is the most important part of this procedure. We have created this lesion with a bipolar radiofrequency ablator, abandoning the usual use of this device (to achieve ...

After the introduction of endocardial radiofrequency catheter, only two arrhythmias, atrial fibrillation and ischemic ventricular tachycardia require surgical procedures. In this review, we describe recent advancements and problems of surgical treatment for atrial fibrillation. On the basis of multiple-circuit re-entry theory, Cox developed the maze ...

Atrial fibrillation (AF) in cardiac surgical patients is detrimental in the long perspective. Concomitant surgical ablation of AF is recommended in guidelines and performed in most centers. The article describes the experiences in a single institution with concomitant surgical argon-based cryoablation in 115 patients using three different application techniques (epicardial ...

Atrial fibrillation (AF) is a heart rhythm abnormality that involves irregular, and often rapid, heartbeats. Recent studies demonstrate the feasibility of treating AF and other structural heart diseases with limited, left-atrial ablation lesion sets. These cardiac ablation procedures reduce the time required to perform the ...

Although the maze procedure is highly effective for most patients with atrial fibrillation (AF), its standardized application to elderly patients is controversial. Between 2004 and 2007, 143 patients with a mean age of 65 years of age or older underwent the modified Cox-maze procedure concomitant with other cardiac ...

Atrial fibrillation (AF) is the most common arrhythmia, affecting over 2.2 million Americans. One effective treatment is cardiac ablation, which shows a high rate of success in treating paroxysmal AF. Focused ultrasound has gained interest for thermal ablation for decades due to its noninvasive characteristics. Based on the simulation results of transducer ...

The ultimate purpose of this dissertation is the evaluation of the feasibility of transesophageal cardiac surgery in arrhythmia treatment, using therapeutic ultrasound energy without the requirement for surgical incisions or blood contact. Atrial fibrillation (AF) is the most common cardiac arrhythmia, affecting over 2.2 million Americans. One effective treatment is cardiac ...

Atrial fibrillation (AF) is associated with substantial morbidity, mortality, and economic burden and confers a lifetime risk of up to 25%. Current medical management involves thromboembolism prevention, rate, and rhythm control. An increased understanding of AF pathophysiology has led to enhanced pharmacological and medical therapies; however this is often limited by toxicity, variable symptom ...

The surgical treatment of atrial fibrillation began in 1987, when Dr. James Cox introduced the maze procedure. This operation proved to be extremely effective in curing atrial fibrillation and preventing its most dreaded complication, stroke. However, many surgeons found the operation to be too difficult and invasive. Over the last 5 to 10 years, various ...

Atrial fibrillation is a major health problem in Western countries, and is associated with considerable morbidity and resource consumption. Safe and reliable surgical techniques for the termination of this arrhythmia have been developed since the time of the original Cox �maze I� procedure. Novel equipment based on radiofrequency and microwave ...

Atrial fibrillation (AF) is the most common arrhythmia encountered in clinical practice today. Contemporary medical treatment options include atrioventricular nodal blocking agents to control heart rates during AF, antiarrhythmic drugs aimed at maintaining normal sinus rhythm, and anticoagulation therapies to reduce stroke risk. Invasive treatment of AF has emerged because of the toxicities and ...

The study aim was to compare maze outcomes using microwave ablation or cryoablation in patients with mitral disease and atrial fibrillation (AF). Between 1999 and 2005, 340 patients underwent mitral valve surgery and concomitant maze procedure involving either microwave ablation (n=96, MW ...

The study aim was to compare maze outcomes using microwave ablation or cryoablation in patients with mitral disease and atrial fibrillation (AF). Between 1999 and 2005, 340 patients underwent mitral valve surgery and concomitant maze procedure involving either microwave ablation (n=96, MW ...

The purpose of this study was to examine how different scoring procedures affect interpretation of maze curriculum-based measurements. Fall and spring data were collected from 199 students receiving supplemental reading instruction. Maze probes were scored first by counting all correct maze choices, followed by ...

What Is Catheter Ablation? Catheter ablation (ab-LA-shun) is a medical procedure used to treat some types of arrhythmia (ah-RITH-me- ...

Procedure for chemical analysis of specimens of silicone-based ablative thermal-insulation materials

Atrial fibrillation is the most commonly sustained arrhythmia in man. While it affects millions of patients worldwide, its incidence will markedly increase with an aging population. Primary goals of AF therapy are to (1) reduce embolic complications, particularly stroke, (2) alleviate symptoms, and (3) prevent long-term heart remodelling. These have been proven to be a challenge as there are major ...

Atrial fibrillation is the most commonly sustained arrhythmia in man. While it affects millions of patients worldwide, its incidence will markedly increase with an aging population. Primary goals of AF therapy are to (1) reduce embolic complications, particularly stroke, (2) alleviate symptoms, and (3) prevent long-term heart remodelling. These have been proven to be a challenge as there are major ...

Atrial fibrillation (AF) is the most common arrhythmia encountered in clinical practice. Its increasing prevalence, particularly among the elderly, renders it one of the most serious current medical epidemics. Several management questions confront the clinician treating a patient with AF: Should the condition be treated? Is the patient at risk of death or serious morbidity as a result of this ...

... Pathway, such as Wolff-Parkinson-White Syndrome Atrial fibrillation and atrial flutter Ventricular tachycardia ... statement on catheter and surgical ablation of atrial fibrillation: recommendations for personnel, policy, procedures and follow-up. ...

Surgery of atrial fibrillation (AF) was first described in 1991 by James Cox in what was named the Cox-Maze procedure, and over the years it has been considered the gold-standard treatment, with best results in maintaining sinus rhythm in the long term. Nevertheless, the complexity and aggressivity of the first techniques of cut-and-sew limited the ...

Surgery of atrial fibrillation (AF) was first described in 1991 by James Cox in what was named the Cox-Maze procedure, and over the years it has been considered the gold-standard treatment, with best results in maintaining sinus rhythm in the long term. Nevertheless, the complexity and aggressivity of the first techniques of cut-and-sew limited the ...

... The procedure is known as laparoscopic uterine nerve ablation or LUNA. This may help with the pain ...

Although ethanol ablation has been successfully used to treat cystic thyroid nodules, this procedure is less effective when the thyroid nodules are solid. Radiofrequency (RF) ablation, a newer procedure used to treat malignant liver tumors, has been valuable in the treatment of benign thyroid nodules regardless of ...

Appendages are important sources of sensory information for all animals that possess them but they are commonly damaged in nature. We describe how the tactile system of the crayfish Cherax destructor functioned when subjected to the kind of damage found in wild-caught or cultured animals. Touch information was methodically varied by the removal of antennae and chelae. The resulting behaviour was ...

... restore a normal heartbeat. A procedure called catheter ablation is used to treat some arrhythmias if medicines ... tissue where abnormal heart rhythms may start. Catheter ablation usually is done in a hospital as part ...

Mar 16, 2006 ... Radio frequency catheter ablation procedures have evolved ... The principal limitation of the radio frequency ablation ...

The 14-unit T-maze had proven to be a valuable tool for investigating age-associated memory impairment (AAMI). While another task widely used to evaluate AAMI, the water maze, is primarily used to evaluate allocentric hippocampal-dependent spatial memory, the 14-unit T-maze can assess egocentric procedural memory. ...

Owing to an increased use of diagnostic imaging for evaluating patients with other abdominal conditions, incidentally discovered kidney masses now account for a majority of renal tumors. Renal ablative therapy is assuming a more important role in patients with borderline renal impairment. Renal ablation uses heat or cold to bring about cell death. ...

Ablation of atrial flutter (AFL) requires linear radiofrequency application; these procedures are usually performed via a femoral approach from the inferior vena cava (IVC). Congenital anomalies of this venous system may limit catheter ablation. This report presents ablation of an AFL through the azygous ...

Thermal tissue ablation is an interventional procedure increasingly being used for treatment of diverse medical conditions. Microwave ablation is emerging as an attractive modality for thermal therapy of large soft tissue targets in short periods of time, making it particularly suitable for ablation of hepatic and ...

Recently, we demonstrated the prevalent role of cerebellar networks in the acquisition of the procedural components of spatial information by testing hemicerebellectomized (HCbed) rats in a classical spatial task, the Morris water maze (MWM). As procedures used in the water maze are a mixture of different ...

to wear them? Which procedures for varicose veins do you perform? Sclerotherapy? Heat ablation or laser ablation? Vein stripping? Questions to ask about different procedures for...

... general anesthesia by performing the procedure in this fashion. I�m putting another catheter up and this ...

One of the main issues with radiofrequency (RF) ablation of the subpleural lung malignancy is pain management during and after RF ablation. In this article, we present a case that utilized a technique to decrease the pain associated with RF ablation of a malignancy located within the subpleural lung. Under CT guidance, we created an ...

Catheter ablation has become the curative treatment modality for various arrhythmias. Extending the indications for catheter ablation from simple supraventricular tachycardias to complex arrhythmias such as ventricular tachycardia or atrial fibrillation, the investigator faces prolonged procedure times, fluoroscopy exposure and the ...

A repeated acquisition procedure for the 8-arm radial maze was evaluated with trimethyltin (TMT). Ten male Long-Evans rats were trained to collect a single food pellet at the end of each baited arm on each trial of a daily 12-trial test session. Four of t...

A repeated acquisition procedure for the 8-arm radial maze was evaluated with trimethyltin (TNT). en male Long-Evans rats were trained to collect a single food pellet at the end of each baited arm on each trial of a daily 12-trial test session. our of the eight arms were baited o...

The present work investigated the behavioral effects of a moderate exposure (1 h per day for 5 consecutive days) to a static magnetic field (SMF, 128 mT) in male rats. SMF effects were evaluated in two sets of control and SMF-exposed rats. One set of animals was used for evaluation of SMF potential effects on emotional behaviors in the elevated plus maze and in the open field. ...

We present the case of a patient with a pacemaker and a sarcoma lung metastasis treated with microwave ablation. Although the treatment of tumours with microwave ablation is a successful and minimally invasive approach, there are concerns about the safety of this procedure for patients with implanted cardiac devices, such as a ...

Pulmonary vein isolation with catheter ablation is an effective treatment in patients with symptomatic atrial fibrillation refractory or intolerant to antiarrhythmic medications. The cryoballoon catheter was recently approved for this procedure. In this paper, the basics of cryothermal energy ablation are reviewed including its ability ...

Neutron doses often come dominant in mazes of electron accelerator facilities in which X-rays of energies more than 10 MV are produced. A simple analytical method to calculate neutron doses in such a facility is developed. In the calculation procedure, it is assumed that the irradiation room is spherical in shape and the maze is ...

Objective: Concomitant ablative therapy for atrial fibrillation can be effective at converting patients to normal sinus rhythm and at maintaining a regular rhythm for at least 5 years. We provide herein a comparison of an endocardial approach using Cryoablation with an epicardial approach using a suction-based RF ablation technology. Methods: Between ...

... pregnancy and x-rays. This procedure may involve exposure to x-rays. However, ... radiation dose from interventional procedures. Severe pain after RFA is ...

Ablation of paroxysmal AF in symptomatic patients is a clear indication after failure of anti-arrhythmic therapy (class IIa according to the recommendations). Ablation of persistent AF is feasible, as second line after failure of medical treatment, although there is no real consensus on ablative techniques : this ...

Emergency catheter ablation is justified in critical patients with drug-refractory life-threatening arrhythmias. The procedure can be used for ablation of an accessory pathway in preexcitation syndrome with high risk of ventricular fibrillation and in patients with shock due to ischemic cardiomyopathy and incessant ventricular ...

Atrial Fibrillation (AF) is an increasingly common and costly medical problem.1�3 Given the disappointing efficacy and side effects associated with pharmacological therapy for AF, new treatment options are needed. Over the last decade, advances in our understanding of the mechanisms of AF, coupled with iterative improvements in catheter ablation techniques, have spurred the ...

The elevated plus-maze test has been widely used for screening of anxiolytic drugs and for exploring neurobiological bases of anxiety. In this study, we validated a new automated system that enables to record exploratory behavior in the elevated plus-maze test. This system, called cyberplus, consisted of ten pairs of photoelectric cells strategically ...

For many years, the development of effective ablation or laser machining techniques for making micro-optical components has been the key factor in the birth of new photonic devices and systems. In this article, the ablation characteristics of two types of the most important transparent materials, transparent polymers and glasses, are studied. Simple shaped ...

Catheter ablation is an important treatment modality for patients with atrial fibrillation (AF). Although the superiority of catheter ablation over antiarrhythmic drug therapy has been demonstrated in middle-aged patients with paroxysmal AF, the role the procedure in other patient subgroups-particularly those with long-standing ...

Percutaneous radiofrequency (RF) ablation is a promising treatment for solid renal tumors in selected patients. Nontarget thermal damage is a known risk of the procedure. The authors describe a case of a patient who underwent RF ablation of a lower pole renal lesion and subsequently developed a ureteric stricture secondary to thermal ...

A 72-year old male, referred for percutaneous atrial fibrillation ablation, was found to have cor triatriatum during routine, pre-procedural transesophageal echocardiography. Accessing the superior pulmonary venous atrium and wide area circumferential ablation was guided by intracardiac echocardiography and performed without ...

OBJECTIVE: It has been suggested that overdrive biatrial pacing may prevent the recurrence of atrial fibrillation after the Maze procedure. To further evaluate this hypothesis, we performed a randomized prospective study in 100 patients undergoing valve surgery concomitant with a full Maze procedure to determine ...

The purpose of this study was to determine whether three procedures-- the cloze, maze, and intact cloze--were reliable and valid measures of readability. One hundred and eighty one sophomores were involved in the study. A passage, An Industrial Giant: Standard Oil Company, from the U.S. history textbook "The People Make a Nation" (Sandler, Rozwenc, and ...

Catheter ablation has been established as a potentially curative treatment modality for various arrhythmias. Over the past years, catheter ablation has progressed from focal ablation to complex ablations within a three-dimensional anatomy for the treatment of ventricular tachycardia or atrial fibrillation. Complex ...

The advent of catheter ablation has revolutionized the treatment of supraventricular cardiac arrhythmias, including in the last few years, atrial fibrillation. The discovery of electrically active sleeves of atrial myocardium extending into the pulmonary veins has led to the development of pulmonary vein ostial ablation, with the aim of electrically ...

Radiofrequency cardiac ablation (RFCA) has become the treatment of choice for many cardiac arrhythmias that have not responded to medication. Complications of cardiac ablation include bleeding, thrombosis, pericardial tamponade, and stroke. Many complications are procedure specific, and several complications can be avoided with ...

Objective: To clarify the mechanism of improvement in exercise capacity after the maze procedure.Design: Retrospective study.Setting: Tertiary referral centre.Patients: 26 patients (mean (SD) age 57 (9) years) with atrial fibrillation (AF) and mitral valve disease were studied with echocardiography and cardiopulmonary exercise testing before and after the ...

There is a significant desire by patients to reverse the signs of aging caused by photodamage. Numerous procedures for facial skin rejuvenation have been developed in an attempt to minimize the erythema, dyspigmentation, and rhytides associated with photoaging. The initial procedures developed for facial rejuvenation involve skin resurfacing via complete ...

A novel ablation system consisting of a duty-cycled phased radiofrequency generator and multielectrode mapping and ablation catheters has been introduced to provide ablation therapy in patients with symptomatic atrial fibrillation (AF). Contiguous lesions may be created using anatomically designed ablation ...

Acute pneumothorax is a frequent complication after percutaneous pulmonary radiofrequency (RF) ablation. In this study we present three cases showing delayed development of pneumothorax after pulmonary RF ablation in 34 patients. Our purpose is to draw attention to this delayed complication and to propose a possible approach to avoid this major ...

Acute pneumothorax is a frequent complication after percutaneous pulmonary radiofrequency (RF) ablation. In this study we present three cases showing delayed development of pneumothorax after pulmonary RF ablation in 34 patients. Our purpose is to draw attention to this delayed complication and to propose a possible approach to avoid this major ...

The authors analyze the number and type of electrophysiologic procedures (diagnostic and ablation, and implantation of defibrillators and biventricular pacemakers with defibrillator backup) that were performed during 2009 in all Portuguese electrophysiology centers. A total of 2669 diagnostic electrophysiologic procedures were ...

The purpose of this study was to analyze the clinical outcome of osteoid osteoma treated by thermal ablation after drill opening. A total of 17 patients and 20 procedures were included. All patients had typical clinical features (age, pain) and a typical radiograph showing a nidus. In 5 cases, additional histological specimens were acquired. After drill ...

PURPOSE: This study was designed to analyze the effect of two different ablation modes ("temperature control" and "power control") of a microwave system on procedural outcome in porcine kidneys in vivo. METHODS: A commercially available microwave system (Avecure Microwave Generator; MedWaves, San Diego, CA) was used. The system offers the possibility to ...

Response strategy in the dual-solution plus maze is regarded as a form of stimulus-response learning. In this study, by using an outcome devaluation procedure, we show that it can be based on both action-outcome and stimulus-response habit learning, depending on the amount of training that the animals receive. Furthermore, we show that deactivation of the ...

Catheter ablation is a first line treatment for many cardiac arrhythmias and is generally performed under x-ray fluoroscopy guidance. However, current techniques for ablating complex arrhythmias such as atrial fibrillation and ventricular tachycardia are associated with suboptimal success rates and prolonged radiation exposure. ...

Both radiofrequency (RF) and microwave (MW) ablation devices are clinically used for tumor ablation. Several studies report less dependence on vascular mediated cooling of MW compared to RF ablation. We created computer models of a cooled RF needle electrode, and a dipole MW antenna to determine differences in tissue heat transfer.We ...

Both radiofrequency (RF) and microwave (MW) ablation devices are clinically used for tumor ablation. Several studies report less dependence on vascular mediated cooling of MW compared to RF ablation. We created computer models of a cooled RF needle electrode, and a dipole MW antenna to determine differences in tissue heat transfer.We ...

Radiofrequency ablation procedures inside the left atrial appendage (LAA) are likely to involve dangerous complications because of a high thrombogenic effect. Cryoablation procedures are supposed to be safer. We describe two cases of successful cryoablation procedures. Two NavX-guided cryoablations of permanent ...

The Albuquerque Astronomical Society: Corn Maze The Albuquerque Astronomical Society Corn Maze ... Corn Maze. Date: Friday, 10/23/2009 ...

Objective: In the long-term period after Fontan operation, atrial arrhythmia was one of the important factors to decide the postoperative quality of life. We reviewed the impact of Fontan conversion with arrhythmia surgery and pacemaker therapy. Methods: Thirty-eight patients underwent Fontan conversion using extracardiac conduit from 1992, and 22 patients with atrial arrhythmia underwent ...

for cardiac arrhythmias while performing curative radiofrequency catheter ablative procedures. High of the University of Pennsylvania (HUP). "Catheter ablation can eliminate A-Fib and its associated severe symp- toms (VT). New ablation techniques and strategies developed at Penn have dramatically im- proved

a number of surgical procedures in vivo in sheep, including radiofrequency ablation [15]�[17]. We to guide radiofrequency ablation in the left #12;gentry et al.: method for modeling lesions created by ring, "Intracardiac echocardiography-guided, anatom- ically based radiofrequency ablation of focal atrial ...

Image guided minimally invasive local and locoregional tumor ablation techniques like radiofrequency ablation, interstitial brachytherapy, transarterial chemoembolization (TACE) and selective internal radiotherapy (SIRT) with (90)Yttrium ( (90)Y) microspheres have been established as valuable amendments in oncologic therapy concepts. These techniques allow ...

In a randomized multicenter phase II study, endoscopy with radiofrequency ablation (RFA) resulted in much higher rates of eradication of both high- and low-grade dysplasia associated with Barrett esophagus (BE) than did endoscopy with a sham procedure. The study did not investigate whether radiofrequency ablation was superior to other ...

BACKGROUND:Atrial fibrillation (AF) is often triggered by ectopic foci originating from pulmonary veins (PVs), with the posterior left atrium (LA) comprising part of the substrate for maintenance. Catheter ablation strategies targeting PVs and the posterior LA may be further refined by incorporating technology beyond standard fluoroscopy.OBJECTIVES:To prospectively assess the ...

electrophysiological data within the heart and for delivering radiofrequency (RF) ablation energy (Wharton and Ideker, performed an in vitro ablation study, and viewed the pulmonary veins in vitro. (E-mail: edl@duke.edu) � 2001 for multiple intracardiac procedures and for the visualization of ablated tissue. In ...

We are reporting the case of a female child presenting for the management of symptomatic extensive tracheal hemangiomas who was successfully treated with multiple ablative procedures using KTP laser. This is the first description in the English literature of the use of KTP laser as primary treatment modality for the endoscopic ablation ...

Advances in technology and changes in our understanding of tumor biology have allowed breast cancer treatment to evolve toward less disfiguring procedures. Noninvasive ablative therapy is a natural continuation of this trend. The following paper presents the concepts underpinning focused ultrasound ablation therapy for the treatment of ...

Catheter Ablation of Paroxysmal AF.?Introduction:?Circumferential pulmonary vein antral isolation (PVAI) and atrial complex fractionated electrograms (CFEs) are both ablative techniques for the treatment of paroxysmal atrial fibrillation (PAF). However, data on the comparative value of these 2 ablation strategies are very limited. ...

To study the selection of power, treating time, acting mode and safety of Nd:YAG laser in the procedure of endometrial ablation of the treatment of menorrhagia.

... procedure was developed for solving a general class of two dimensional transient non-linear ablation and heat conduction problems for rocket ...

... the side of the neck. To access the left ventricle, a needle may be used to create a ... obtained before the procedure). The image shows the left ventricle (lower heart chamber), the aorta (the larger artery ...

Percutaneous ablation of renal tumors, including radiofrequency ablation and cryoablation, are increasingly being used for small tumors as an alternative to surgery for poor surgical candidates. Compared to radiofrequency ablation, cryoablation has several advantages: improved volume control and preservation of adjacent structures due ...

Surgical removal or epicardial radiofrequency ablation of the left atrial appendage (LAA) is occasionally required when endocardial ablations fail. We report a modified minimally invasive surgical approach for elimination of recurrent atrial arrhythmias arising from the LAA, including both radiofrequency ablation and appendectomy. ...

Pulmonary vein (PV) isolation is a cornerstone of atrial fibrillation (AF) ablation. This technique is now widely spread all over the world. Numerous studies have demonstrated that complete PV isolation with circular lesions has a better outcome in patients with paroxysmal and persistent AF. In contrast, it may lead to iatrogenic left atrial tachycardia (AT) as an adverse ...

Focal Atrial Tachycardia in the Post AF Ablation Era.?Radiofrequency ablation (RFA) for atrial fibrillation (AF) has become one of the most common catheter ablation procedures performed worldwide. As experience and success in treating patients with paroxysmal AF have increased, more centers are performing ...

Radiofrequency ablation is one of the alternatives in the management of liver tumors, especially in patients who are not candidates for surgery. The aim of this article is to review applicability of radiofrequency ablation achieving complete tumor destruction, utility of imaging techniques for patients' follow-up, indications for local ...

Atrial fibrillation (AF) is commonly encountered in clinical practice and typically it is treated with pharmacological agents. Some patients whose arrhythmias are resistant to pharmacological therapy undergo the maze procedure, which is a surgical treatment. The atrial appendages are removed as part of the surgical procedure. These ...

The Radio Frequency Ablation Segmentation Tool (RFAST) is a software application developed using NIH's Medical Image Processing Analysis and Visualization (MIPAV) API for the specific purpose of assisting physicians in the planning of radio frequency ablation (RFA) procedures. The RFAST application sequentially leads the physician ...

We describe a most unusual problem of a split needle following a lung radiofrequency ablation (RFA) procedure. We encountered the problem when retracting the electrode hooks into the shaft at completion of the ablation. We describe the process we adopted to overcome this problem. Charring of the ablated tissue can ...

The exponential differencing scheme of Spalding, which has been used for convection problems, is adapted to solve one-dimensional ablation problems by using a grid attached to the receding surface. Using the finite control volume approach, element conduction, convection, and storage matrices are developed. The method is applied to a steady-state ablation ...

The exponential differencing scheme of Spalding, which has been used for convection problems, is adapted to solve one-dimensional ablation problems by using a grid attached to the receding surface. Using the Finite Control Volume approach, element conduction, convection, and storage matrices are developed. The method is applied to a steady state ablation ...

The approach to catheter-based radiofrequency ablation of atrial fibrillation has evolved, and as a consequence, more energy is delivered in the posterior left atrium, exposing neighboring tissue to untoward thermal injury. Simultaneously, catheter technology has advanced to allow more efficient energy delivery into the myocardium, which compounds the likelihood of collateral ...

Over the past decade, image-guided tumor ablation using thermal energy has emerged as a promising technique for treating focal, primary or secondary, nonoperable tumors. Radiofrequency ablation (RFA) is minimally invasive and requires less resources, time, and recovery period and is, moreover, relatively inexpensive. RFA has been used to treat tumors ...

Primary liver tumors are a common clinical problem in the United States and worldwide. Resection has historically been used to treat liver lesions. Commonly used liver-directed therapies include transarterial chemoembolization, selective internal radiation therapy, and ablative therapy. Only ablative therapy can cause direct destruction of the targeted ...

BACKGROUND: A remote magnetic navigation (MN) system is available for radiofrequency ablation of atrial fibrillation (AF), challenging the conventional manual ablation technique. The myocardial markers were measured to compare the effects of the two types of MN catheters with those of a manual-irrigated catheter in AF ablation. ...

This study was designed to compare feasibility, safety, and effectiveness of microwave (MW) ablation versus radiofrequency (RF) ablation of lung tissue in a rabbit model. Twenty New Zealand White rabbits were submitted to MW (n = 10, group A) or RF ablation (n = 10, group B). The procedures were performed with a ...

This study was designed to compare feasibility, safety, and effectiveness of microwave (MW) ablation versus radiofrequency (RF) ablation of lung tissue in a rabbit model. Twenty New Zealand White rabbits were submitted to MW (n = 10, group A) or RF ablation (n = 10, group B). The procedures were performed with a ...

Catheter based radio-frequency ablation is used as an invasive treatment of atrial fibrillation. This procedure is often guided by the use of 3D anatomical models obtained from CT, MRI or rotational angiography. During the intervention the operator accurately guides the catheter to prespecified target ablation lines. The planning ...

There is evidence that parasympathetic denervation may prevent atrial fibrillation (AF) recurrences. This study aimed at applying an anatomic approach for ablation of atrial ganglionic plexi (GPs) in patients with paroxysmal AF. Nineteen patients with symptomatic, paroxysmal AF underwent anatomically guided radiofrequency ablation at the location of the 4 ...

Ventricular tachycardia (VT) is a leading cause of morbidity and mortality for many patients, with a significant emotional and economic burden caused by implantable cardioverter-defibrillator (ICD) shocks and the requirement of medication with significant side effects. Additionally, 10% of VT occurs in patients with no structural heart disease. Until quite recently, ablation ...

A 55-year-old woman underwent bilateral renal artery stent placement with good angiographic result. After the procedure, the patient complained of left flank pain secondary to subcapsular hematoma. Retrospective evaluation of images taken during stent implantation favored the diagnosis of guidewire perforation. Three hours after the procedure, ...

After initial documentation of excellent efficacy with radiofrequency ablation, this procedure is being performed increasingly in more complex situations and for more difficult arrhythmia. In these circumstances, an accurate knowledge of the anatomic basis for the ablation procedure will help maintain this efficacy ...

A new generation of the optical fiber catheter has been developed for surgical treatment of atrial fibrillation with laser radiation. Atrial fibrillation (AF) is a heart rhythm abnormality that involves irregular and rapid heartbeats. The surgical maze procedure was the first treatment that offered a permanent solution for maintaining a normal sinus rhythm ...

We report a case of a 67-year-old woman with stage IIIB locally advanced non-small cell lung cancer who had also suffered from hyperthyroidism with persistent atrial fibrillation (AF). Thiamazole provided euthyroid status, but medication failed to resolve AF. A computed tomography (CT)-scan revealed a 5�5-cm mass in the left hilar region that involved the left atrium (LA) and bifurcation of the ...

Despite the increasing number of sophisticated, computerized tools available to the practicing electrophysiologist for facilitating catheter ablation of ventricular tachycardia, the procedure is often quite challenging. Use of these tools needs to be kept in perspective, subservient to the judgment of the physician. This review explores a series of ...

Although bowel injury is a rare complication of renal radiofrequency ablation, the potential consequences can be devastating. Therefore, it is prudent to perform bowel displacement/protection procedures when feasible. The main bowel displacement techniques include hydrodissection, gas-insufflation, balloon interposition, and electrode torquing. In this ...

The Early Treatment for Retinopathy of Prematurity (ETROP) Study tests the hypothesis that earlier treatment in selected, high risk cases will result in a better visual outcome than conventionally-timed treatment. Treatment consists of ablation of retina ...

BackgroundPatients with long-standing persistent (LSP) atrial fibrillation (AF) who have previously undergone catheter ablation represent a challenging patient population. Repeat catheter ablation in these patients is arduous and associated with a high failure rate, whereas surgical ablation can be complicated by multiple flutters. We ...

A novel radiofrequency ablative system (40 msec-train pulses with twenty 200 msec pulses at the carrier frequency of 750 KHz and 1 Hz repetition rate) aimed at recanalizing totally occluded peripheral arteries was investigated by means of in vitro tissue ablation from human postmortem arterial wall samples. The samples were submitted to irradiation with a ...

The use of catheter ablation to treat AF is increasing rapidly, but there is presently an incomplete understanding of its cost-effectiveness. AF ablation procedures involve significant up-front expenditures, but multiple randomized trials have demonstrated that ablation is more effective than antiarrhythmic drugs ...

Atrial fibrillation (AF) is associated with an increased risk of cardiac and overall mortality. Restoration and maintenance of sinus rhythm is of paramount importance if it can be accomplished without the use of antiarrhythmic drugs. Catheter ablation has evolved into a well-established treatment option for patients with symptomatic, drug-refractory AF. ...

Staple bullectomy is widely performed for the thoracoscopic treatment of spontaneous pneumothorax. When weak emphysematous change was observed to extend to the whole pleura around the localized bulla, weak emphysematous pleura always remain around the stapler after bullectomy. Such cases along with weak pleural surfaces around staplers belong to the groups at high risk of postoperative recurrence. ...

The purpose of these experiments was to evaluate the utility of a water maze for testing performance in non-food restricted rats. Water maze performance was compared to performance in a food-rewarded (food) maze. Separate groups of rats were given single ...

The spatial-delayed alternation task using a T-maze is the standard method for testing working memory in rodents and is widely used. Until now, however, there has been a gap in the understanding of the underlying brain mechanisms. The development of new manganese-enhanced brain imaging methods now permit a more specific examination of these mechanisms by allowing behavioural ...

Thermal tumour ablation techniques, such as radiofrequency (RF) ablation, are applied for radical removal of local tumours as an easier, less invasive alternative to surgical resection. A serious drawback of thermal ablation, however, is that the ablation area cannot be accurately assessed during the ...

Interventional radiology has made great progress during the past decade. In thoracic oncology image guided, percutaneous procedures may be divided into two groups: diagnostic and therapeutic. The routinely performed diagnostic procedures include percutaneous biopsy of parenchymal and mediastinal lesions under fluoroscopic or CT guidance. The therapeutic ...

Several studies have demonstrated that mammals, birds and fish use comparable spatial learning strategies. Unfortunately, except in insects, few studies have investigated spatial learning mechanisms in invertebrates. Our study aimed to identify the strategies used by cuttlefish (Sepia officinalis) to solve a spatial task commonly used with vertebrates. A new spatial learning ...

Radiofrequency ablation of Cavotricuspid Isthmus-dependent Atrial Flutter (CTI AFL), a usual and safe therapeutic procedure in interventional electrophysiology with a high success rate, aiming to induce permanent block of conduction over CTI, is normally performed via the femoral access, which allows practical access to the CTI through the inferior vena ...

Microwave ablation is an emerging treatment option for many cancers, cardiac arrhythmias and other medical conditions. During treatment, microwaves are applied directly to tissues to produce rapid temperature elevations sufficient to produce immediate coagulative necrosis. The engineering design criteria for each application differ, with individual consideration for factors ...

Computed tomography is the standard imaging modality to minimize the extent of surgical or ablative treatment in osteoid osteomas. In the last 15 years, since a description of thermal ablation of osteoid osteomas was first published, this technique has become a treatment of choice for this tumor. We report the case of a 20-year-old man with an osteoid ...

Laser ablation is becoming a dominant technology for direct solid sampling in analytical chemistry. Laser ablation refers to the process in which an intense burst of energy delivered by a short laser pulse is used to sample (remove a portion of) a material. The advantages of laser ablation chemical analysis include direct ...

Numerous studies have demonstrated the efficacy of interstitial ablative approaches for the treatment of renal and hepatic tumors. Despite these promising results, current systems remain highly dependent on operator skill, and cannot treat many tumors because there is little control of the size and shape of the zone of necrosis, and no control over ablator ...