Search results for "pacemaker"

Right ventricular lead placement and ventricular dyssynchrony in a pacemaker population: An acute analysis from the evaluation of apical and non-apic…

2016

Model predictions of the ionic mechanisms underlying the beating and bursting pacemaker characteristics of molluscan neurons

1976

The general properties of the excitable membrane on molluscan pacemaker neurons can be described on the basis of a fair amount of experimental evidence available in the literature. The neuronal membrane exhibits under voltage clamp an initial inward current carried by both Na+ and Ca2+ ions, the time- and voltage-dependent characteristics of which are similar to that of other excitable structures. The conductance mechanism for the two ion species and the transport kinetics appear to be closely similar. The time course and amplitude of the delayed outward current carried by K+ ions shows a marked dependence on the membrane potential. Characteristic for the molluscan neurons is the existence …

The perioperative management of small animals with previously implanted pacemakers undergoing anaesthesia.

2020

Abstract Objective There is little information in the veterinary literature about the perioperative management of small animal patients with previously implanted pacemakers undergoing elective or emergency non-cardiac procedures. The purpose of this article is to review the current literature with regard to human patients, with previously implanted pacemakers, undergoing general anaesthesia. Using this and the current information on pacemakers and anaesthesia in dogs and cats, we provide recommendations for small animal patients in this situation. Databases used Google Scholar, PubMed and CAB Abstracts using and interlinking and narrowing the search terms: “dog”, “cat”, “small animals”, “an…

Recommendations of the European Cardiac Arrhythmia Society Committee on Device Failures and Complications

2006

Recommendations of the European Cardiac Arrhythmia Society Committee on Device Failures and Complications MASSIMO SANTINI,* JOHANNES BRACHMANN,† RICCARDO CAPPATO,‡ WYN DAVIES,§ JERONIMO FARRE,‖ SAMUEL LEVY,¶ AURELIO QUESADA,# RENATO P. RICCI,** EDWARD ROWLAND,†† NEIL SULKE‡‡ From *San Filipo Neri Hospital, Rome, Italy, †Klinikum Coburg, Germany, ‡Policlinico S. Donato, Milan, Italy, §St. Mary Hospital, London, UK, ‖Fundacion Jimenez Diaz, Madrid, Spain, ¶Hopital Nord des Bourrellys, Marseille, France, #Hospital General University of Valencia, Spain, **San Filippo Neri Hospital, ††St. George Medical School, London, UK, ‡‡Eastbourne General Hospital, Sussex, UK

Active-fixation coronary sinus pacing lead extraction: A hybrid approach

2012

Cardiac resynchronization therapy (CRT) can be considered as the standard treatment for patients suffering from heart failure (NYHA III–IV), severely reduced left ventricular (LV) function, and wide QRS complexes. Over the past years, the lead systems used to stimulate the left ventricle have evolved technically from epicardial approaches to a transvenous access accompanied by a significant reduction of procedure-related complication rates [1]. However, even today, LV dislodgement rates ranging 5–10% and the instability of thresholds over time remain the greatest challenges with transvenous LV leads in CRT. Therefore, a special LV lead utilizing active fixation (the Attain StarFix® active f…

Über eine spontane Extrasystolie im Schrittmachersystem des Tunicatenherzens (Ciona intestinalis L.)

1964

Some experimental results on action potential (EKG) in the pacemaker system of the tunicata heart (Ciona intestinalis) are presented. Synchronous records of both end and central heart regions show a spontaneous chance of the electrical activity in the middle of the heart tube, just before the periodic reversal of the direction of the pulsating wave starts. Extra systoles in the central pacemaker influence the terminal centres and provoke reversal.

Exposed Subcutaneous Implantable Devices

2015

Background: Implantable venous and electrical devices are prone to exposure and infection. Indications for management are controversial, but—especially if infected—exposed devices are often removed and an additional operation is needed to replace the device, causing a delay in chemotherapy and prolonging healing time. We present our protocol for device salvage, on which limited literature is available. Methods: Between 2007 and 2013, 17 patients were treated (12 venous access ports, 3 cardiac pacemakers, and 2 subcutaneous neural stimulators). Most patients were operated within 7 days from exposure. All patients received only a single perioperative dose of prophylactic antibiotic. In cases …

Invited commentary.

2007

Low-energy epicardial pacing in children: the benefit of autocapture.

1999

Abstract Background . Permanent cardiac pacing in children results commonly in augmented energy consumption because of the high pacing rates and the ample stimulation safety margin applied in children. Cardiovascular anatomy and limited venous access sometimes preclude the otherwise preferred endocardial approach. In this multicenter patient series, we studied the feasibility, safety, and energy saving obtained by a combination of steroid-eluting epicardial leads with autocapture devices capable of ongoing adjustment of the stimulation output to the prevailing threshold. Methods . Autocapture devices (Pacesetter Microny SR+ and Regency SR+; Pacesetter, Solna, Sweden) and steroid-eluting epi…

A simple method for preoperative assessment of the best fitting electrode length in single lead VDD pacing.

1996

For single lead VDD pacing, electrodes with various distances between the lead tip and the floating atrial dipole (AV distance) are available. Using different AV distances allows positioning of the atrial dipole in the mid- to high right atrium, regardless of the size of the right heart. In this position, reliable atrial sensing and rejection of ventricular far-field potentials can be expected. A simple test for the preoperative assessment of the best fitting AV distance in the individual patient was tested. We studied 24 consecutive patients prior to implantation of a VDD pacemaker. With the patient in supine position, a test electrode with an AV distance of 13 cm was taped onto the thorax…