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'Synchronized Electrical Cardioversion' (204)


Dec
2017

Understanding the mechanisms that drive ventricular fibrillation is essential for developing improved defibrillation techniques to terminate ventricular fibrillation (VF). Distinct organization patterns of chaotic, regular, and synchronized activity were previously demonstrated in VF that persisted over 1 to 2 minutes (long-duration VF [LDVF]). We hypothesized that activity on the endocardium may be driving these activation patterns in LDVF and that unsuccessful defibrillation shocks may alter activation patterns.

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Sep
2017

Atrial Fibrillation: Current Therapies.

Vet Clin North Am Small Anim Pract 2017 Sep 20;47(5):977-988. Epub 2017 Jun 20.
Romain Pariaut
A rate control, or a rhythm control, strategy can be applied to the management of atrial fibrillation. Rate control of atrial fibrillation consists of decreasing the ventricular response rate by limiting the number of supraventricular impulses that can travel through the atrioventricular node. The goal of decreasing heart rate in dogs with atrial fibrillation is usually achieved with a combination of the calcium channel blocker diltiazem and digoxin.

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Jun
2017

Use of the antiarrhythmic ibutilide after isolated pulmonary vein isolation (PVI) might distinguish atrial remodeling severity and cases requiring further substrate modification, thereby improving efficacy of persistent atrial fibrillation (AF) treatment. Ninety-six consecutive patients with persistent AF were randomized after PVI to either direct current synchronized cardioversion (DCC group, n = 48) or 1 mg of intravenous ibutilide (ibutilide group, n = 48) followed by no further intervention if AF converted to sinus rhythm (SR) within 30 minutes (ibutilide conversion subgroup) or by complex fractionated atrial electrogram (CFAE) ablation until SR recovery or complete CFAE elimination (ibutilide nonconversion subgroup). With similarly distributed baseline characteristics and no serious postablation complications, the primary end point of 12-month SR maintenance rate after PVI was significantly higher for ibutilide versus the DCC group before (75% vs 56%; p = 0.

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Aug
2017

Atrial fibrillation (AF) constitutes a relatively infrequent pregnancy complication, which may be a therapeutic Gordian knot. Indeed, sparse data exist regarding the prevalence, prognosis, and management of AF during pregnancy. In general, AF occurs as a benign, self-limited arrhythmia, but occasionally may have severe hemodynamic consequences in pregnant patients suffering from heart failure, congenital heart disease, or other comorbidities.

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Dec
1969

To evaluate the effect of catheter ablation vs. direct current synchronized cardioversion (DCC) in patients with persistent atrial fibrillation (AF) and left ventricular systolic dysfunction, and to define baseline features of patients that will get more benefit from ablation.
From July 2013 to October 2014, 97 consecutive single-center patients with persistent AF and symptomatic heart failure (left ventricular ejection fraction (LVEF) <50%) underwent DCC followed by amiodarone (n = 40) or circumferential pulmonary vein isolation (PVI; n = 57) according to patient's preference were recruited in the study.

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Feb
2017

To characterize the management of acute pediatric supraventricular tachycardia (SVT), placing special emphasis on infants, patients refractory to adenosine (refractory SVT), and patients with hypotension, poor perfusion, or altered mental status (unstable SVT).
Retrospective cohort study of patients 0-18 years of age without congenital heart disease who presented to our pediatric hospital from January 2003 to December 2012 for the treatment of acute SVT. Multiple logistic regression was applied to identify whether age was a risk factor for different SVT therapies.

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Jul
2017

Atrial fibrillation (AF) is a frequent reason for emergency department visits. According to current guidelines either rate- or rhythm-control are acceptable therapeutic options in such situations. In this report, we present the complicated clinical course of a patient with AF and a rapid ventricular response.

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Dec
1969

Previous serological studies have shown controversial results whether defibrillation or cardioversion can cause myocardial injury. Cardiovascular Magnetic Resonance (CMR) can be used to detect myocardial edema, hyperemia and capillary leak as features of acute myocardial injury. The aim of this study was to assess for myocardial and skeletal muscle injury in swine following transthoracic shocks.

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Feb
2016

Atrial fibrillation (AF) is the most common arrhythmia in adults, and is encountered in 10-15% of the patients with hyperthyroidism. Unless euthyroidism is restored, pharmacological or electrical cardioversion is controversial in patients with AF who remain hyperthyroid.
The aim of this study was to assess the efficacy of electrical cardioversion and predictors of AF recurrence in hyperthyroid and euthyroid patients.

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Nov
2015

To assess the success of electrical cardioversion for the treatment of new-onset atrial fibrillation in critically ill patients and to evaluate the stability of sinus rhythm in responders during the subsequent 24 hours.
Retrospective study.
Twelve-bed cardiosurgical ICU at a university hospital.

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Dec
1969

Heart rate monitoring is especially interesting in patients with atrial fibrillation (AF) and is routinely performed by ECG. A ballistocardiography (BCG) foil is an unobtrusive sensor for mechanical vibrations. We tested the correlation of heartbeat cycle length detection by a novel algorithm for a BCG foil to an ECG in AF and sinus rhythm (SR).

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Oct
2014

We report a case of paroxysmal supraventricular tachycardia (PSVT) that occurred during video-assisted thoracoscopic (VATS) lobectomy in a patient with concealed Wolff-Parkinson-White (WPW) syndrome. A 59-year-old man with lung cancer was scheduled for VATS lobectomy under general anesthesia. After inserting a thoracic epidural catheter, general anesthesia was induced with intravenous administration of propofol.

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Oct
2014

Early defibrillation for cardiac arrest patients is a formidable link in the chain of survival promulgated by the American Heart Association. Automated external defibrillators (AEDs) provide public access defibrillation for out-of-hospital cardiac arrests and improve survivability. AEDs are only approved for use in patients in cardiac arrest; defibrillation may be inadvertently advised if utilized on a patient not experiencing cardiac arrest.

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Dec
2014

Atrial fibrillation is a common arrhythmia in dogs with structural cardiac disease and can result in significant clinical signs. Several methods of electrical cardioversion of atrial fibrillation have been described. Biphasic transthoracic cardioversion of atrial fibrillation in dogs with naturally occurring heart disease has been described in veterinary medicine and has been shown to be highly successful.

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Jan
2015

It is estimated that 33.5 million people in the world have developed atrial fibrillation (AF), and an estimated 30% of patients with AF are unaware of their diagnosis (silent AF).
The purpose of this study was to test a new technology for contactless detection of AF based on facial video recordings.

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Nov
2013

Cardiac dysrhythmias after electrical injury have been reported previously, however, atrial fibrillation after low-voltage electrical injury is extremely rare. We present a case of atrial fibrillation with rapid ventricular response resulting from a low-voltage electrical injury.
A 24-year-old active duty Navy sailor presented to the emergency department after an electrical shock from a 440-V furnace.

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Aug
2013

To compare the efficacy of electrical versus pharmacological cardioversion following prosthetic cardiac valve replacement in patients with permanent atrial fibrillation (AF).
Patients with permanent AF who had undergone prosthetic cardiac valve replacement, who had a cardiothoracic ratio ≤ 0.5 and a left atrial diameter ≤ 50 mm for ≥ 6 months after surgery were randomly divided to receive either electrical or pharmacological cardioversion.

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Jun
2013

Synchronized Direct Current Cardioversion (SDC) is an established therapy for the termination of supraventricular tachycardia (SVT - either atrio-ventricular nodal reentry tachycardia (AVNRT) or atrio-ventricular reentrant tachycardia (AVRT)) with poor perfusion. The evidence is extremely limited with regard to the safety and effectiveness of this therapy. In Australia, half of the eight ambulance services include SDC within their clinical practice guidelines for the management of poorly perfused SVT; however the degree of variation in the application of SDC across these guidelines suggests a need to quantify the practice.

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Mar
2013

A healthy 14-year-old presented to an emergency department in Alaska, complaining of shortness of breath, chest pain, and 72 hours of malaise and headache. On admission, her blood pressure was 80/50 mm Hg, and she had cool extremities. Electrocardiography revealed wide-complex ventricular tachycardia.

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Dec
1969

A serious cause of panic attack.

Case Rep Emerg Med 2012 12;2012:393275. Epub 2012 Jun 12.
Michael O'Connell, Aaron Bernard
We report on a case of a patient with atrial fibrillation in the setting of Wolff-Parkinson-White syndrome. The patient underwent synchronized electrical cardioversion, typically considered safe and effective, which resulted in a dangerous complication for the patient (degeneration into ventricular fibrillation). Discussion of common rhythm disturbances in WPW and management strategies are reviewed.

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Mar
2013

Several different biphasic waveforms are used clinically, but few studies have compared their efficacy. The two main waveforms are the biphasic rectilinear (BR) and biphasic truncated exponential (BTE) waveforms, both of which have important differences, particularly at the extremes of transthoracic impedance.
To compare the efficacy of two commonly used defibrillation waveforms in the elective cardioversion of atrial fibrillation.

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Jul
2012

We report a case of dyspnea in a 71-year-old man who underwent heterotopic heart transplantation in 2003. At presentation, electrocardiography showed ventricular fibrillation of the native heart and then a progression to both donor and recipient hearts. Synchronized electrical cardioversion restored sinus rhythm and relieved the patient from his symptoms.

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Dec
1969

Pregnancy can precipitate cardiac arrhythmias not previously present in seemingly well individuals. Atrial and ventricular premature beats are frequently present during pregnancy and are usually benign. Supraventricular tachycardia and malignant ventricular tachyarrhythmias occur less frequently.

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Apr
2011

[Usage of a defibrillator].

Nihon Rinsho 2011 Apr;69(4):695-8
Masahiko Inomata
Guideline 2010 for cardiopulmonary resuscitation was released the other day. There is no big change in the use of a defibrillator. Asynchronous defibrillation is used as a therapy for VF and pulseless VT.

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Apr
2011

Management of Atrial Fibrillation in Pregnancy.

J Atr Fibrillation 2010 Oct-Nov;3(3):295. Epub 2010 Oct 22.
Luca Cacciotti, Ilaria Passaseo
Pregnancy is accompanied by a variety of cardiovascular changes in normal women; all of these changes are thought to promote arrhythmogenesis. Atrial fibrillation is unusual during pregnancy and it can represent a benign, self-limited lone atrial fibrillation or can be hemodynamically significant in parturient with or without structural heart disease. Management of atrial fibrillation should be the same as in non-pregnant women, but requires faster intervention, even in patients with a normal heart function, and cautious use of medication to avoid harm to the fetus.

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Aug
2010

Cardiac arrhythmias during central venous catheter (CVC) insertion are typically transient events with no hemodynamic repercussions. Pediatric reports on this condition are scarce and fail to describe potentially life-threatening complications.
A 14-day-old boy was admitted to the pediatric intensive care unit presenting with septic shock.

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Jun
2010

Pauses for shock delivery in chest compressions are detrimental to the success of resuscitation and may be eliminated with the use of mechanical chest compressors. However, the optimal phasic relationship between mechanical chest compression and defibrillation is still unknown. We therefore undertook a study to assess the effects of timing of defibrillation in the mechanical chest compression cycle on the defibrillation threshold (DFT) using a porcine model of cardiac arrest.

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Mar
2010

2 spayed female (8 and 9 years old) and 1 sexually intact male (6.5 years old) Boxers were treated because of sustained ventricular tachycardia by electrical cardioversion.
Physical examination of the 8-year-old female Boxer revealed tachycardia (heart rate, 250 beats/min), weak femoral pulses, pale mucous membranes, panting, and lethargy.

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Dec
1969

A defibrillator sync output signal connector provides an ECG synchronization signal that can be used by some defibrillators for the purpose of performing synchronized cardioversion [1]. This process is used to stop an abnormally fast heart rate or cardiac arrhythmia by the delivery of a therapeutic dose of electric current to the heart during the R-wave of the cardiac cycle. Timing the shock to the R-wave prevents the delivery of the shock during the vulnerable period of the cardiac cycle, which could induce ventricular fibrillation [2].

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Dec
2009

Accurate diagnosis of wide QRS complex tachycardia is difficult in emergent situations. According to the Advanced Cardiac Life Support (ACLS) tachycardia algorithm of the American Heart Association, immediate synchronized cardioversion should be applied to patients with wide QRS tachycardia with any evidence of hemodynamic instability. However, this may not be appropriate in all patients, especially those with idiopathic left ventricular tachycardia.

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Jan
2010

Cardiac resynchronization permits atrial-synchronized simultaneous pacing of both left and right ventricles in order to optimize mechanical contraction. In case of an atrial tachycardia, a VVI-'ventricular sense'-tracking modus can be programmed to maintain biventricular pacing. In this case report, we describe the use of this modus.

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Jul
2009

To examine the influence of direct current shock application in anaesthetized horses with atrial fibrillation (AF) and to study the effects of cardioversion to sinus rhythm (SR).
Prospective clinical study.
Eight horses successfully treated for AF (transvenous electrical cardioversion after amiodarone pre-treatment).

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Dec
1969

Heart failure continues to be a major public health problem with high morbidity and mortality rates, despite the advances in medical treatment. Advanced heart failure patients have severe persistent symptoms and a poor quality of life. Cardiac resynchronization therapy (CRT), an invasive therapy which involves synchronized pacing of both right and left ventricles, improves ventricular conduction delay and left ventricular performance.

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Sep
2008

To report a case of atrial fibrillation with rapid ventricular response occurring during pregnancy.
A 35-year-old woman, gravida 3, para 1, abortus 1, with a history of persistent supraventricular arrhythmia, presented at 22 weeks' gestation. After adenosine administration, electrocardiography revealed atrial fibrillation with rapid ventricular response.

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Sep
2008

In this report we briefly describe a patient with a dual chamber implantable cardioverter defibrillator in the context of severe ischemic cardiomyopathy who developed persistent atrial fibrillation. After appropriate anticoagulation and under mild sedation the patient was successfully cardioverted to sinus rhythm after a programmed ventricular synchronized defibrillation using his defibrillator. Programmed internal cardioversion of persistent atrial fibrillation in patients who have an implantable cardioverter defibillator without atrial defibrillation capabilities could be an effective and safe therapeutic option.

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Dec
1969

The transthoracic application of synchronized direct current cardioversion (DCC) is widely used to terminate atrial fibrillation, atrial flutter, and other supraventricular tachyarrhythmia. DCC is a highly effective method for acute restoration of sinus rhythm. Although DCC is a relatively safe and frequently performed procedure, data on potential side effects are very rarely reported in the literature.

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Oct
2008

We tested the hypothesis that the frequency of shock success differs between initial and recurrent episodes of ventricular fibrillation (VF).
Out-of-hospital cardiac arrest patients presenting with VF from December 1996 to February 2007 defibrillated using an AED with a fixed-energy protocol (150 J) (Philips Medical Systems, Seattle, WA) were included for analysis. We defined shock success as termination of VF within 5s post-shock (either asystole or organized rhythm).

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Oct
2008

A 67-year-old woman with persistent atrial fibrillation presented for elective electrical cardioversion. The patient was cardioverted to normal sinus rhythm with a synchronized 150 joules (J) biphasic shock. Varying P-wave morphology suggesting intermittent interatrial block (IAB) was noted after the cardioversion on the rhythm strip.

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Dec
1969

The objective of this study, was to investigate the effect of internal DC shocks on the atrial fibrillation frequency (AFF). AFF has previously been shown to predict the success and energy requirements in patients undergoing internal cardioversion (IC) of atrial fibrillation (AF). However the possibility that unsuccessful shocks during IC may influence the AFF has not been before studied.

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Dec
1969

Ventricular fibrillation (VF) can be synchronized with a novel synchronized pacing technique (SyncP) using low-energy pacing pulses, which causes pace termination of VF. Synchronized pacing (SyncP) is defined as optical recording guided real-time detection and stimulation of spatiotemporal excitable gaps. In this paper, we investigate the effect of post-shock SyncP strategy on improvement of defibrillation efficacy.

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Mar
2007

Supraventricular tachycardia (SVT) is the most common tachyarrhythmia that necessitates treatment in children. It is characterized by a rapid and regular heart rate, which generally exceeds 180 beats per minute in children and 220 beats per minute in adolescents. Supraventricular tachycardia results from conduction of electrical impulses along an accessory connection from the atrium to the ventricle (atrioventricular reentry tachycardias: orthodromic or antidromic) or conduction within the atrioventricular node (atrioventricular node reentry tachycardia).

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Jul
2007

A failed near-threshold defibrillation shock is followed by an isoelectric window (IEW) and rapid repetitive responses that reinitiate ventricular fibrillation (VF). We hypothesized that properly timed (synchronized) postshock pacing stimuli (SyncP) may capture the recovered tissues during the repetitive responses and prevent postshock reinitiation of VF, resulting in improved defibrillation efficacy.
We explored the effect of postshock SyncP on defibrillation efficacy in isolated rabbit hearts (n = 12).

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Feb
2007

Ventricular desynchronization imposed by permanent dual-chamber ventricular pacing (VDD) may compromise ventricular function.
We investigated the impact of background VDD pacing on the right and left ventricular (LV) function on 129 clinically stable outpatients (mean age 69 +/- 10) implanted chronically with a dual-chamber pacemaker or an automatic defibrillator by using echocardiographic techniques including tissue doppler imaging (TDI) and color M-mode (CMM) examinations, and B-type natriuretic peptide (BNP) measurements. Patients were divided into two groups of normal (n = 65) or impaired (n = 64) LV systolic function (ejection fraction 63 +/- 6% and 38 +/- 10%, respectively) according to clinical and echocardiographic criteria.

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Dec
2006

Low-dose biphasic waveform cardioversion has been used for the termination of atrial arrhythmias in adult patients. The energy required for termination of atrial arrhythmias in pediatric patients is not known. The objective of this study is to determine the minimum energy required for successful external cardioversion of atrial arrhythmias in pediatric patients using biphasic waveform current.

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Dec
2006

External electrical cardioversion is a technique basically used as treatment of choice in supraventricular arrhythmias, atrial fibrillation standing out for its frequency. This procedure consists in the application of one or several synchronized electrical discharges through the patient's chest to revert cardiac rhythm to sinus rhythm. One of the complications is generally the appearance of the skin alterations, pain or intense local heat.

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Dec
2006

Low-energy defibrillation is very desirable in cardiac rhythm management. We previously reported that ventricular fibrillation (VF) can be synchronized with a novel synchronized pacing technique (SyncP) using low-energy pacing pulses. This study sought to create a line of block during VF using SyncP.

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Oct
2005

External electrical cardioversion (EEC) has been suggested as a cause of myocardial damage, but results from several previously published studies are conflicting.
The purpose of the study was to evaluate myocardial electrical injury caused by EEC.
After elective EEC for atrial fibrillation (AF), cardiac troponin I (cTnI) was measured in 193 consecutive patients attending the Cardiology Department of the San Maurizio Hospital of Bolzano for elective EEC of AF over a period of 13 months.

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Dec
1969

Defibrillation and cardioversion are techniques in which a short electric impulse is administered to the heart in order to restore its normal rhythm. During cardioversion electric impulse is synchronized to the QRS on electrocardiogram. During defibrillation electric current passes through the heart in any phase of electric heart cycle.

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