scholarly journals Monophasic Action Potentials of the Right Atrium in Patients With Paroxysmal Atrial Fibrillation

2001 ◽  
Vol 65 (10) ◽  
pp. 893-896 ◽  
Author(s):  
Junichi Sekiya ◽  
Yoshio Ohnishi ◽  
Tomoo Inoue ◽  
Mitsuhiro Yokoyama
Keyword(s):  
Atrial Fibrillation ◽  
Paroxysmal Atrial Fibrillation ◽  
Right Atrium ◽  
Action Potentials ◽  
Monophasic Action Potentials ◽  
The Right

Acetylcholine release by a stimulus train lowers atrial fibrillation threshold

1987 ◽  
Vol 253 (4) ◽  
pp. H863-H868 ◽  
Author(s):  
D. E. Euler ◽  
P. J. Scanlon
Keyword(s):  
Atrial Fibrillation ◽  
Action Potential ◽  
Right Atrium ◽  
Single Pulse ◽  
Monophasic Action Potential ◽  
Adrenergic Blockade ◽  
The Right ◽  
Alpha Chloralose ◽  
Electrical Stimuli ◽  
Local Release

This study was designed to evaluate the importance of local release of autonomic neuromediators when electrical stimuli are applied to the right atrium to measure the atrial fibrillation threshold (AFT). Experiments were performed in 16 open-chest dogs anesthetized with alpha-chloralose. The dogs were denervated by bilateral transection of the stellates and cervical vagi. The AFT was determined in 11 dogs by delivering either a train of stimuli (14 pulses, 4 ms, 100 Hz) or a single stimulus (10 ms) to the right atrium during its vulnerable period. In eight dogs, beta-adrenergic blockade with timolol (0.1 mg/kg) had no effect on the AFT determined with either method. Atropine (0.2 mg/kg), given after timolol, significantly increased the train-of-pulses AFT from 4.7 +/- 0.4 to 32.3 +/- 4.6 mA (P less than 0.001). The single-pulse AFT increased from 16.5 +/- 1.5 to 17.8 +/- 1.5 mA (P less than 0.05). Atropine had a similar effect on the AFT when it was given in the absence of timolol (n = 3). In five additional dogs, a monophasic action potential was recorded while a 10-mA train was delivered to the atrium during its absolute refractory period. There was marked shortening of the monophasic action potential duration (55 +/- 6 ms) in the first beat after the train. The shortening was totally abolished by atropine (0.2 mg/kg). The results suggest that a train of stimuli liberates local stores of acetylcholine, which cause a shortening of atrial repolarization time and a profound decrease in the current necessary to evoke fibrillation.

Reverse use-dependent effects of sotalol demonstrated by recording monophasic action potentials of the right ventricle

1991 ◽  
Vol 68 (11) ◽  
pp. 1183-1187 ◽  
Author(s):  
Claus Schmitt ◽  
Johannes Brachmann ◽  
Martin Karch ◽  
Bernd Waldecker ◽  
Lilia Navarrete ◽  
...  
Keyword(s):  
Right Ventricle ◽  
Action Potentials ◽  
Monophasic Action Potentials ◽  
The Right

Electrophysiological and Electroanatomical Mapping of the Right Atrium in Persistent Atrial Fibrillation: Relation to Collagen Turnover

2015 ◽  
Vol 38 (9) ◽  
pp. 1039-1048 ◽  
Author(s):  
CHRISTOS A. GOUDIS ◽  
ELEFTHERIOS M. KALLERGIS ◽  
EMMANUEL M. KANOUPAKIS ◽  
HERCULES E. MAVRAKIS ◽  
NIKI E. MALLIARAKI ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Right Atrium ◽  
Persistent Atrial Fibrillation ◽  
Electroanatomical Mapping ◽  
Collagen Turnover ◽  
The Right

scholarly journals The Presence of a Large Chiari Network in a Patient with Atrial Fibrillation and Stroke

2016 ◽  
Vol 2016 ◽  
pp. 1-3
Author(s):  
Nneka Schwimmer-Okike ◽  
Johannes Niebuhr ◽  
Grit Gesine Ruth Schramek ◽  
Stefan Frantz ◽  
Heike Kielstein
Keyword(s):  
Atrial Fibrillation ◽  
Pulmonary Embolism ◽  
Right Atrium ◽  
Supraventricular Tachyarrhythmias ◽  
Chiari Network ◽  
The Right

The Chiari network is an embryological remnant found in the right atrium, mostly without any significant pathophysiological consequences. However, several cardiac associations are reported in the literature including supraventricular tachyarrhythmias. We present a case of a 96-year-old body donor with a stroke episode and intermittent atrial fibrillations. The dissection of the heart revealed the presence of an immense Chiari network with a large central thrombus. The role of a Chiari network in the pathogenesis of stroke and pulmonary embolism is discussed.

scholarly journals Clinical Usefulness of the Atrial Double Potential at the Intercaval Region in the Right Atrium. A New Index for Inducibility of Atrial Fibrillation in Electrophysiologic Studies.

2001 ◽  
Vol 42 (6) ◽  
pp. 713-723 ◽  
Author(s):  
Yoshikazu Kitano ◽  
Shinichi Niwano ◽  
Naoto Yoshizawa ◽  
Hideyuki Hara ◽  
Masahiko Moriguchi ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Right Atrium ◽  
Clinical Usefulness ◽  
The Right ◽  
Electrophysiologic Studies
Sign in / Sign up

Export Citation Format

Share Document