[Coronary artery and myocardium lesion comparison post atrioventricular ring radiofrequency catheter ablation with different catheters].
OBJECTIVE
To analyze the extent of myocardium and coronary artery lesion post atrioventricular ring radiofrequency catheter ablation with different tip catheters.


METHODS
Twenty-one healthy dogs were randomly divided into 64 degrees C/50 W/100 s, 64 degrees C/100 W/100 s, 45 degrees C/45 W/100 s groups and ablated by 4 mm tip catheter, 8 mm tip catheter and irrigated tip catheter respectively. Left atrioventricular ring and right atrioventricular ring ablation were performed in all dogs. After ablation, myocardium lesion volume was calculated as 1/6pi x length x width x depth. Histological examinations were performed at the myocardium tissue at ablation sites.


RESULTS
The lesion depths post 8 mm tip catheter ablation (7.18 +/- 1.72) mm and irrigated tip catheter ablation (7.99 +/- 1.77) mm were similar and significantly deeper than that post 4 mm tip catheter ablation (4.54 +/- 1.38) mm, P < 0.01. Similar results were found in terms of lesion volume [(356.76 +/- 94.44) mm(3) post 8 mm tip catheter ablation, (391.69 +/- 109.54) mm(3) post irrigated tip catheter ablation and (191.34 +/- 74.52) mm(3) post 4 mm tip catheter ablation]. Five (5/42, 11.9%) transmural myocardium necrosis and 8 (8/42, 19%) coronary artery lesions were observed post ablations.


CONCLUSIONS
The extents of post ablation myocardium and coronary artery lesion were significantly higher induced by 8 mm tip catheter and irrigate tip catheter compared those by 4 mm tip catheter.
Gu
Hong-yue
HY
Department of Cardiology, the First Hospital of Harbin Medical University, Harbin 150001, China.
Shi
Ming-yu
MY
Zhao
Yong-wei
YW
Yin
Xue-song
XS
Qu
Xiu-fen
XF
D000818:Animals; D006328:Cardiac Catheterization / Q000009:adverse effects*; D017115:Catheter Ablation / Q000009:adverse effects*; D003331:Coronary Vessels / Q000473:pathology*; D004285:Dogs; D009206:Myocardium / Q000473:pathology*