A narrow QRS tachycardia with varying right atrial activation sequence: What is the mechanism?

2021 ◽  
Author(s):  
Koji Yasumoto ◽  
Yasuyuki Egami ◽  
Kohei Ukita ◽  
Akito Kawamura ◽  
Hitoshi Nakamura ◽  
...  
Keyword(s):  
Right Atrial ◽  
Narrow Qrs ◽  
Atrial Activation ◽  
Activation Sequence

scholarly journals Tachycardia cycle length alternans during a narrow QRS complex tachycardia with eccentric retrograde atrial activation sequence: What is the mechanism?

2020 ◽  
Vol 36 (1) ◽  
pp. 209-210
Author(s):  
Meryem Kara ◽  
Ahmet Korkmaz ◽  
Emin Karimli ◽  
Evrim Simsek ◽  
Ozcan Ozeke ◽  
...  
Keyword(s):  
Cycle Length ◽  
Qrs Complex ◽  
Narrow Qrs ◽  
Narrow Qrs Complex ◽  
Atrial Activation ◽  
Activation Sequence

A Narrow QRS Complex Tachycardia With Eccentric Retrograde Atrial Activation Sequence: What is the Mechanism?

2009 ◽  
Vol 20 (12) ◽  
pp. 1410-1412
Author(s):  
MIGUEL A. ARIAS ◽  
ALBERTO PUCHOL ◽  
EDUARDO CASTELLANOS ◽  
LUIS RODRÍGUEZ-PADIAL
Keyword(s):  
Qrs Complex ◽  
Narrow Qrs ◽  
Narrow Qrs Complex ◽  
Atrial Activation ◽  
Activation Sequence

Change in the Retrograde Atrial Activation Sequence Following Radiofrequency Modification of the Atrioventricular Node:

2003 ◽  
Vol 14 (5) ◽  
pp. 461-466 ◽  
Author(s):  
José Dizon ◽  
James Reiffel ◽  
John Kassotis ◽  
Ian Woollett ◽  
Hasan Garan
Keyword(s):  
Atrioventricular Node ◽  
Atrial Activation ◽  
Activation Sequence

Relation of canine atrial activation sequence to anatomic landmarks

1982 ◽  
Vol 242 (3) ◽  
pp. H421-H428 ◽  
Author(s):  
H. Hayashi ◽  
R. L. Lux ◽  
R. F. Wyatt ◽  
M. J. Burgess ◽  
J. A. Abildskov
Keyword(s):  
Fiber Direction ◽  
Entry And Exit ◽  
Activation Time ◽  
Anatomic Landmarks ◽  
Crista Terminalis ◽  
Bipolar Electrodes ◽  
First Derivative ◽  
Bachmann’S Bundle ◽  
Atrial Activation ◽  
Activation Sequence

Activation sequence in the atria was investigated in 35 dogs. The atria were studied as four regions, and activation sequence in one region was determined in each experiment. In each region 60 electrograms were recorded simultaneously from bipolar electrodes. The maximal first derivative of the electrograms was taken as activation time. Dried atrial specimens, which permitted identification of pectinate muscles, crista terminalis, and the axis of fiber direction, were prepared. Nonuniform activation was demonstrated with more rapid conduction over the long axis of fiber direction and in Bachmann's bundle, crista terminalis, and pectinate muscles. These regions of rapid conduction were the same during sinus rhythm and ectopic and retrograde activation. Findings confirm the presence of paths with relatively rapid conduction in the atria and demonstrate that these are related to gross anatomic features. Findings also demonstrate that the paths are accessible to activation from multiple sites rather than insulated conduction paths with limited sites for entry and exit of activation.

Baroreflex modulation of heart rate and initiation of atrial activation in dogs

1988 ◽  
Vol 255 (3) ◽  
pp. H503-H513 ◽  
Author(s):  
R. B. Schuessler ◽  
T. E. Canavan ◽  
J. P. Boineau ◽  
J. L. Cox
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Right Atrial ◽  
Autonomic Blockade ◽  
Left And Right ◽  
Atrial Activation ◽  
The Right ◽  
A Site ◽  
Induced Changes ◽  
Cardiac Nerves

In open-chest dogs, blood pressure was regulated by titrating doses of phenylephrine and nitroprusside to determine its effect on heart rate and pacemaker location. Changes in blood pressure correlated with changes in heart rate (r = 0.86). Activation time mapping demonstrated multicentric atrial activation, with a site of origin-rate relationship. The fastest pacemakers were located in the most cranial regions and slowest in the most caudal areas. In this chloralose-morphine anesthetized model, autonomic blockade with atropine and propranolol suggests that acute baroreflex-induced changes in heart rate were mediated exclusively by either increased sympathetic or parasympathetic tone and were not associated with inhibition of the opposite system. Division of right and left thoracic cardiac nerves indicated the left sympathetics participated in the baroreflex in 50% of the animals and the left parasympathetics in 90% of the animals. Both the right sympathetics and parasympathetics were active in the baroreflex in all animals. The data demonstrate that physiological heart rate response is regulated through an extensive system of right atrial pacemakers modulated by both left and right efferent cardiac nerves.

Narrow QRS tachycardia with apparent concentric atrial activation pattern: What is the mechanism?

2018 ◽  
Vol 41 (9) ◽  
pp. 1229-1231
Author(s):  
Krishna Kumar Mohanan Nair ◽  
Narayanan Namboodiri ◽  
Hiren Kevadiya ◽  
Ajitkumar Valaparambil
Keyword(s):  
Activation Pattern ◽  
Narrow Qrs ◽  
Atrial Activation

scholarly journals A narrow QRS tachycardia with changed atrial activation after previous ablations: What is the mechanism?

2019 ◽  
Vol 42 (6) ◽  
pp. 730-732
Author(s):  
Anggia Chairuddin Lubis ◽  
Mukund A. Prabhu ◽  
Robert D. Anderson ◽  
Jonathan M. Kalman
Keyword(s):  
Narrow Qrs ◽  
Atrial Activation
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