T‐wave changes of cardiac memory caused by frequent premature ventricular contractions originating from the right ventricular outflow tract

2019 ◽  
Vol 30 (9) ◽  
pp. 1549-1556 ◽  
Author(s):  
Yusuke Sakamoto ◽  
Yasuya Inden ◽  
Hiroya Okamoto ◽  
Keita Mamiya ◽  
Toshiro Tomomatsu ◽  
...  
Keyword(s):  
Right Ventricular ◽  
Right Ventricular Outflow Tract ◽  
Ventricular Outflow Tract ◽  
Outflow Tract ◽  
Premature Ventricular Contractions ◽  
Cardiac Memory ◽  
T Wave ◽  
The Right

scholarly journals Target Characteristics and Voltage Mapping of the Matrix in Idiopathic Premature Ventricular Contractions Originating from the Right Ventricular Outflow Tract

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Zhiyong Zhang ◽  
Xiaofeng Hou ◽  
Zhiyong Qian ◽  
Jianghong Guo ◽  
Jiangang Zou
Keyword(s):  
Right Ventricular ◽  
Right Ventricular Outflow Tract ◽  
Ventricular Outflow Tract ◽  
Outflow Tract ◽  
Premature Ventricular Contractions ◽  
Bipolar Voltage ◽  
Successful Ablation ◽  
Voltage Mapping ◽  
Significant Difference ◽  
The Right

Background. The study was aimed at exploring the electrophysiological characteristics (EPS) of the optimal ablation site and its relationship with electroanatomic voltage mapping (EVM) in idiopathic premature ventricular contractions (PVCs) originating from the right ventricular outflow tract (RVOT). Methods. A total of 28 patients with idiopathic RVOT PVCs underwent successful ablation and EVM using a 3D electroanatomical mapping (CARTO) system. Results. Both bipolar and unipolar EVM showed a similar band-like lower-voltage area (LVA) under the pulmonary valve in all the patients; 21.4% of the targets were located in the band-like LVA. 42.9% of the targets were at the border of the band-like LVA on the bipolar voltage map, but unipolar mapping showed that 53.6% of the targets were located in the band-like LVA, and 35.7% of the targets at the border of the band-like LVA. A significant difference was found in both unipolar and bipolar voltage values between the regions within 0-5 mm above the optimal ablation site and the other regions. A similar difference was observed only in unipolar voltage values below the optimal ablation site. At the ablation site, there were frequent occurrences of a fragmented wave and voltage reversion in the bipolar electrograms, frustrated falling limbs, W bottom, and a QS configuration width > 150  ms in the unipolar electrograms. Conclusions. EVM showed that the band-like LVA was an interesting area for the search of the optimal ablation sites of idiopathic RVOT-PVCs, especially the border area. There was focal microscarring around the ablation targets; some characteristics of EPS proved significant for successful ablation.

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