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Sadeghi Masoumeh - - 2012
Coronary artery disease (CAD) and myocardial infarction are the most common causes of mortality and morbidity all over the world. Aspirin resistance is an important part of therapeutic failure in patients who experience several atherosclerotic events despite aspirin therapy. Different studies have reported aspirin resistance between 5% and 45% all ...
Guo Xiaogang - - 2012
The function of the repolarization reserve in the prevention of ventricular arrhythmias during cardiac ischemia/reperfusion and the impact of ischemia on slowly activated delayed rectifier potassium current (I(Ks)) channel subunit expression are not well understood. The responses of monophasic action potential duration (MAPD) prolongation and triangulation were investigated following an ...
Vinegoni Claudio - - 2012
To date there is a lack of tools to map the spatio-temporal dynamics of diverse cells in experimental heart models. Conventional histology is labor intensive with limited coverage, whereas many imaging techniques do not have sufficiently high enough spatial resolution to map cell distributions. We have designed and built a ...
Shalganov Tchavdar N - - 2012
Focal right ventricular tachycardia is relatively uncommon. It usually arises from specific anatomic locations. A 59-year-old woman with a structurally normal heart and an automatic cardioverter-defibrillator implanted beforehand presented with drug-resistant incessant ventricular tachycardia for which 1786 anti-tachycardia pacing therapies and 119 shocks had been delivered. Electroanatomical mapping showed focal ...
Reithmann Christopher - - 2011
AimsThe purpose of the study was to evaluate the role of coronary venous mapping to identify epicardial ventricular tachycardia (VT) in patients with structural heart disease.Methods and resultsEpicardial mapping of the electrophysiological substrate through the coronary vein branches using a 2.2F, 16-pole microelectrode catheter was performed in 33 consecutive patients ...
Kozlíková K - - 2011
In this retrospective study we analysed changes of the ST segment in patients with arterial hypertension using multi-lead body surface mapping of the electric heart field as the ST segment often shows non-specific changes and is influenced by many different conditions. We constructed isointegral maps (IIM) of chosen intervals (the ...
Iijima Kenichi - - 2011
A 34-year-old woman presented with idiopathic premature ventricular complex (PVC) and ventricular tachycardia (VT) originating from the area called the left ventricular summit. Radiofrequency (RF) application both through the coronary sinus and to the epicardial surface transiently suppressed the VT/PVC. Radiofrequency with sufficient energy was only applicable from the endocardial ...
El-Damaty Ahmed - - 2011
Left atrial ablation has become more commonplace with the advent of catheter ablation for atrial fibrillation. A number of transseptal sheaths have been produced to enhance safe and efficient catheter manipulation in the left atrium (LA) for these procedures. Some of the sheaths have been subject to recall due to ...
Sayah Sima - - 2011
In this article, we report 2 young patients (a 15-year-old adolescent girl and a 25-year-old man) with drug-refractory palpitations. Admission electrocardiograms showed runs of ventricular tachycardia with left bundle-branch block morphology, left inferior axis, early precordial QRS transition, and positive QRS complex in lead I. In right ventricular mapping, the ...
Yoshida Kentaro - - 2011
The purpose of this study was to assess the prevalence of the re-entry circuit within the interventricular septum in post-infarction patients referred for ventricular tachycardia (VT) ablation. Post-infarction ventricular tachycardia can involve the endocardial myocardium, the intramural myocardium, the epicardium, or the His Purkinje system. Among 74 consecutive patients with ...
Augello Giuseppe - - 2011
Perisinusal atrial tachycardia may represent a challenging situation due to unsustained burst characterizing the arrhythmia, sensitivity to bumping, and potential complications including sinus node ablation. This case describes the use of a noncontact mapping system to map and ablates this arrhythmia. Benefit of this technology is described. (PACE 2011;1-4).
Erdem Alim - - 2011
OBJECTIVE: The difference of the conduction velocity (CV) around the tricuspid valve annulus between the counter-clockwise (CCW) atrial flutter and the clockwise (CW) atrial flutter has not been well clarified. This study was undertaken to evaluate the CV and the conducting area (CA) per millisecond around the tricuspid valve annulus ...
Giaccardi Marzia - - 2011
Situs viscerum inversus totalis (SVIT) is a congenital disorder characterized by mirror reversal of the thoracic and abdominal organs. Different studies have shown that the ablation procedure can be performed without fluoroscopy with safety and effectiveness, in the setting of supraventricular tachycardia. We successfully performed an anatomical map and a ...
Kim Ki-Hun - - 2011
Ablation Catheter Entrapment by Chordae Tendineae. We report on the entrapment of an ablation catheter by chordae tendineae in the mitral valve during radiofrequency (RF) ablation of ventricular tachycardia. The entrapped tip had to be removed via open surgery. Great care must be taken when performing radiofrequency ablation around the ...
Milberg Peter - - 2011
BACKGROUND: Molecular remodelling in heart failure includes slowing of repolarization, leading to proarrhythmia. OBJECTIVE: To evaluate the effects of NCX inhibition on repolarization as a novel antiarrhythmic concept in chronic heart failure (CHF). METHODS AND RESULTS: CHF was induced by rapid ventricular pacing in rabbits. LV function was assessed by ...
Bhargava Kartikeya - - 2011
Entrainment mapping of ischemic ventricular tachycardia at a site in the left ventricle where radiofrequency ablation was successful in terminating the tachycardia revealed a post-pacing interval shorter than the tachycardia cycle length. The reason for the same is explained in the current report.
Thavendiranathan Paaladinesh - - 2012
T2-weighted cardiac magnetic resonance imaging is useful in diagnosing acute inflammatory myocardial diseases, such as myocarditis and tako-tsubo cardiomyopathy (TTCM). We hypothesized that quantitative T2 mapping could better delineate myocardial involvement in these disorders versus T2-weighted imaging. Thirty patients with suspected myocarditis or TTCM, referred for cardiac magnetic resonance imaging, ...
Maul Timothy M - - 2011
The PediVAS blood pump is a magnetically levitated centrifugal pump designed for pediatric bridge-to-decision or bridge-to-recovery in pediatric patients from 3-20kg in weight. In preparation for submission of an investigational device exemption (IDE) application, we completed a final six-animal series of pre-clinical studies. The studies were conducted under controlled conditions ...
Yokokawa Miki - - 2011
BACKGROUND: The value of the 12-lead ECG to identify the exit site of post-infarction ventricular tachycardia (VT) has been questioned. The purpose of this study was to assess the accuracy of a computerized algorithm for identifying a VT exit site based on the 12-lead ECG. METHODS AND RESULTS: In 34 ...
Santilli R A - - 2011
Objectives: To describe the electrocardiographic characteristics of ventricular tachycardia arising from the right ventricular outflow tract and the particular association between this arrhythmia and the presence of localised right ventricular outflow tract enlargement in English bulldogs. Methods: Five English bulldogs were referred with a history of syncope or cardiogenic shock. ...
Martinek Martin - - 2011
Criteria for Epicardial Origin in Ischemic VT. Objectives: We tested proposed algorithms for idiopathic and nonischemic tachycardias for their ability to identify epicardial LV-VT origins. Backgroud: Several ECG features have been reported to identify epicardial origins for left ventricular tachycardias (LV-VTs) in the absence of myocardial infarction. Only limited data ...
Nacif Marcelo Souto - - 2011
To evaluate the relationship between "Look-Locker" (LL) and modified Look-Locker Inversion recovery (MOLLI) approaches for T1 mapping of the myocardium. A total of 168 myocardial T1 maps using MOLLI and 165 maps using LL were obtained in human subjects at 1.5 Tesla. The T1 values of the myocardium were calculated ...
Jang Young-Ho - - 2012
Recent studies have shown that stromal cell derived factor-1 (SDF-1), first known as a cytokine involved in recruiting stem cells into injured organs, confers myocardial protection in myocardial infarction, which is not dependent on stem cell recruitment but related with modulation of ischemia-reperfusion (I/R) injury. However, the effect of SDF ...
Andreu David - - 2011
BACKGROUND: -Scar heterogeneity identified with contrast enhanced-Cardiac Magnetic Resonance (ce-CMR) has been related to its arrhythmogenic potential by using different algorithms. The purpose of the study was to identify the algorithm that best fits with the electroanatomical voltage maps (EAM) to guide ventricular tachycardia (VT) ablation. METHODS AND RESULTS: -Three-dimensional ...
Nakano Emi - - 2011
Identification of Ventricular Outflow Tract Tachycardia. Background: Reentrant ventricular outflow tract (OT) tachycardia is rare in patients with nonischemic heart disease. The mechanism of ventricular tachycardia (VT) arising from the region of the aortic sinus of Valsalva (ASOV) is usually focal, rather than reentrant. Consequently, less is known about reentrant circuits ...
Díaz Infante Ernesto - - 2011
Premature ventricular contractions originating in the right ventricular outflow tract may respond poorly to pharmacological treatment, and ablation using conventional fluoroscopically-guided systems may be complicated by the difficulty in inducing arrhythmias. We describe the use of a non-contact mapping system to ablate difficult-to-induce premature ventricular contractions originating in the right ...
Haas Sebastian - - 2011
BACKGROUND: Robotic-assisted laparoscopic prostatectomy (RALP) is usually performed in steep Trendelenburg position, which can be associated with cardiac impairment due to positioning and capnoperitoneum. This study investigated haemodynamic consequences and cardiac function in this type of surgery and evaluated the hypothesis that steep Trendelenburg position and capnoperitoneum results in haemodynamic ...
Kozlíková K - - 2011
The aim of our work was to study the opposite polarity of the PQ segment to the P wave body surface potential maps in different groups of patients. We constructed isointegral maps (IIM) in 26 healthy controls (C), 16 hypertensives (HT), 26 patients with arterial hypertension and left ventricular hypertrophy ...
Deneke Thomas - - 2011
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 catheters maneuvered under fluoroscopic guidance without the use of a ...
Shokrollahi E - - 2011
The arrhythmogenic substrate in patients with prior myocardial infarct (MI) is located at the border zone, BZ. In this study we correlated the BZ identified by two methods: electro-anatomical voltage mapping (EAVM) and a novel MRI method, multi-contrast late enhancement (MCLE). A pre-clinical porcine model with chronic MI was used ...
Valderrábano Miguel - - 2011
Catheter ablation of ventricular tachycardia (VT) can be technically challenging due to difficulty with catheter positioning in the left ventricle (LV) and achieving stable contact. The Hansen Sensei Robotic system (HRS) has been used in atrial fibrillation but its utility in VT is unclear. The purpose of this study was ...
Anselme Frédéric - - 2011
Macro-reentrant atrial arrhythmias development is conditioned by the presence of fixed (anatomical or acquired) or functional barriers of conduction with areas of slow conduction at critical atrial sites. It may occur with or without underlying heart disease. Recent development of sophisticated 3D mapping systems has greatly contributed to a better ...
Nair Girish M - - 2011
A patient with D-TGA and surgical repair (Mustard's procedure) presented with appropriate ICD shocks due to monomorphic ventricular tachycardia, refractory to antiarrhythmic medications. The patient underwent an electrophysiological study and catheter ablation for the VT. Substrate and pace mapping techniques, with the help of an electroanatomical mapping system, was used ...
Teh Andrew W - - 2011
Aims Mapping of atrial fibrillation (AF) involves identification of low-voltage regions associated with complex fractionated electrograms (CFE) which theoretically represent abnormal substrate and targets for ablation. Whether low-voltage CFE areas also identify abnormal substrate during paced rhythm is unknown. Methods and results Twelve patients with persistent AF undergoing ablation of ...
Hioki Mika - - 2011
A 47-year-old male with both atrial tachycardia and atrial fibrillation underwent catheter ablation. During the procedure, rapid administration of adenosine triphosphate induced atrial tachycardia. A non-contact mapping system revealed a focal atrial tachycardia originating from the lateral right atrium, which was successfully ablated. Following the ablation of tachycardia, atrial fibrillation ...
Chinushi Masaomi - - 2011
A 35-year-old man, who had an episode of aborted sudden cardiac death due to ventricular fibrillation, suffered from multiple storms of ventricular tachycardia (VT). Conventional cardiac examinations did not reveal any structural heart diseases, and he had been treated by an implantable cardioverter defibrillator since 2007. At the latest admission, ...
Heck Patrick M - - 2011
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 ablation for persistent AF. Optimal results may ...
Caillier Bertrand - - 2011
QRS widening and QT prolongation are associated with bupropion. The objectives were to elucidate its cardiac electrophysiological properties. Patch-clamp technique was used to assess the I(Kr) -, I(Ks) -, and I(Na) -blocking effects of bupropion. Langendorff retroperfusion technique on isolated guinea-pig hearts was used to evaluate the MAPD(90) -, MAP ...
Tomita Takeshi - - 2011
We present a patient with non-inducible atrial tachycardia (AT) after atriotomy for surgical repair of heart disease who underwent ablation successfully. Using a 3-D mapping system, we presumed the atriotomy site on the lateral right atrial wall by searching for linear double potentials (DP) during sinus/paced rhythm from the coronary ...
Mönnig Gerold - - 2011
We report a case of postoperative acquired atrioventricular (AV) block and successful ablation of isthmus-dependent atrial flutter using "cryomapping" in combination with a mapping system preserving AV conduction via right infero-septal accessory pathway. (PACE 2011;1-2).
Gyöngyösi Mariann - - 2011
The three-dimensional NOGA(®) (Biologics Delivery Systems, a Johnson & Johnson company, Irwindale, CA, USA) electromechanical mapping system simultaneously registers the electrical and mechanical activities of the left ventricle, enabling online assessment of myocardial viability. The system distinguishes between viable, nonviable, stunned, and hibernating myocardium and can assess wall motion. The ...
Johansen Ida B - - 2011
Cardiac disease is frequently reported in farmed animals, and stress has been implicated as a factor for myocardial dysfunction in commercial fish rearing. Cortisol is a major stress hormone in teleosts, and this hormone has adverse effects on the myocardium. Strains of rainbow trout (Oncorhynchus mykiss) selected for divergent post-stress ...
Yang Lin - - 2011
To investigate cardiac function and myocardial perfusion during 48 h after cardiopulmonary resuscitation (CPR), further to test myocardial stunning and seek indicators for long-term survival after CPR. After 4 min of untreated ventricular fibrillation, fifteen anesthetized pigs were studied at baseline and 2 h, 4 h, 24 h, and 48 ...
Ip James E - - 2011
BACKGROUND:: Dual chamber pacemaker systems can lead to two forms of pacemaker-facilitated tachycardia: pacemaker-mediated tachycardia (PMT) and tracking of sinus or atrial tachycardia. Current pacemaker algorithms cannot always differentiate between these two tachycardias. OBJECTIVE:: The purpose of this study was to investigate a novel algorithm for distinguishing the two mechanisms ...
Margos Panagiotis N - - 2011
A 78-year-old man came for a scheduled check up one month after the implantation of a permanent dualchamber pacemaker for symptomatic transient atrioventricular conduction disturbances (intermittent Mobitz II atrioventricular block). The patient's ECG indicated a loss of atrial capture by the atrial electrode with 1:1 atrioventricular conduction. A subsequent X-ray ...
Kumar Saurabh - - 2011
BACKGROUND: Atrial mechanical stunning is a form of tachycardia mediated atrial cardiomyopathy that manifests after reversion of persistent atrial arrhythmias to sinus rhythm. OBJECTIVES: To examine if chronic omega-3 polyunsaturated fatty acid supplementation with fish oils can reverse atrial mechanical stunning. METHODS: Patients undergoing reversion of persistent atrial fibrillation (AF) ...
Zaher Medhat F - - 2011
Inadvertent malposition of a pacemaker ventricular lead into the left ventricle is an uncommon event, and its actual incidence is probably unknown. It may be underestimated and underreported because of a possible asymptomatic course. A 12-lead electrocardiogram is important to confirm proper placement. We report a case of a 60-year-old ...
Dadkhah Shahriar - - 2011
Ischemic preconditioning (IPC) is a well-documented phenomenon. Short episodes of sublethal ischemia provide cardioprotective effects for subsequent longer duration ischemic events. Although the exact mechanism of IPC is not yet known, the chemical basis of IPC seems to involve preservation of ATP or collateral vascularization recruitment. In this case report, ...
Jia Li - - 2011
RFCA has been established as an effective and curative therapy for severely symptomatic PVC from the outflow tract in structurally normal hearts. However, it is unknown whether PVCs originating from the left ventricular septum, are effectively eliminated by RFCA. This study aimed to investigate electrophysiologic characteristics and effects of radiofrequency ...
Jeewa Aamir - - 2010
A case of an infant, following surgical repair for double outlet right ventricle, who developed low cardiac output syndrome and complete heart block that required insertion of a pacemaker is presented. The infant underwent optimization of his ventricular function to determine whether pacing the right ventricle or left ventricle or ...
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