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Author(s): Rakesh Gopinathannair , Benjamin C Salgado , Brian Olshansky Added: 3 years ago
Heart rate and blood pressure are tightly regulated by autonomic control to effect adequate blood flow as needed. This regulatory process breaks down when the vasovagal reflex is activated. Profound, but brief, circulatory collapse manifests as bradycardia (cardioinhibitory response) and/or hypotension (vasodepressor response) and/or altered cerebral autoregulation, resulting in transient loss of… View more

Electrophysiology & Arrhythmia
Author(s): Richard Sutton Added: 3 years ago

Electrophysiology & Arrhythmia
Cardiac Pacing in Reflex Syncope
Author(s): Marco Tomaino , Vincenzo Russo , Daniele Giacopelli , et al Added: 2 years ago

Electrophysiology & Arrhythmia
Author(s): David Hamon , Jane Taleski , Marmar Vaseghi , et al Added: 3 years ago
Orthotopic heart transplantation (OHT) is the most effective long-term therapy for end-stage heart disease, with implanted left ventricular assist devices (‘destination therapy’) as an alternative for selected patients. The denervation of the transplanted heart with complete loss of autonomic nervous system modulation, the use of immunosuppressant drugs, as well as the risk of allograft rejection… View more

Vascular Disease and Surgery

Electrophysiology & Arrhythmia
Author(s): Richard Sutton Added: 3 years ago
Syncope in a patient with a pacemaker commands urgent action to ascertain its cause and provide appropriate treatment. This is a well accepted statement but the field has evolved in recent years and, strangely, has received little attention. Many considerations bear on this issue. First, syncope in pacemaker patients is not common but may be more so than generally considered. The lack of… View more

Electrophysiology & Arrhythmia
Adenosine Test in Syncope of Unknown Origin
Author(s): Melani Sotiriadou , Antonios P Antoniadis , Nikolaos Fragakis , et al Added: 2 years ago

Electrophysiology & Arrhythmia
Cardiac Effects of Lightning Strikes
Author(s): Theodoros Christophides , Sarosh Khan , Mahmood Ahmad , et al Added: 3 years ago
Lightning strikes between clouds and ground objects occur when the difference in electrical potential between the two is greater than 30,000 Volts, as thus they are able to exceed the atmospheric electrical resistance, generating currents that vary from 30,000 to 100,000 Amperes, and lasting between 0.1–0.001 seconds. As per data from the Lightning Imaging Sensor (LIS)-equipped satellite… View more

Electrophysiology & Arrhythmia
Author(s): Mark E Josephson Added: 3 years ago
In patients with syncope or episodes of palpitations and heart disease, an electrophysiology study (EPS) may be of value by means of potential induction of sustained ventricular tachyarrhythmias.1,2 Programmed ventricular stimulation may be useful in the context of risk stratification of ischaemic patients with left ventricular ejection fraction (LVEF) 30–40 %, and there has been some evidence… View more

Electrophysiology & Arrhythmia
Author(s): Demosthenes G Katritsis Added: 3 years ago
Since its first description by Hays in England in 1906, second-degree atrioventricular (AV) block has been a fascinating clinical entity, mainly due to obscure points regarding its diagnosis that emanate from misconceptions and errors regarding its proper definition.1–3 The practicing clinician should be aware of the following points that may assist a proper diagnosis and, consequently, accurate… View more

Electrophysiology & Arrhythmia
Cardioneuroablation for Vasovagal Syncope
Author(s): Le Li , Sunny Po , Yan Yao Added: 10 months ago

Electrophysiology & Arrhythmia

Prevention & Chronic Conditions