Electrophysiological characteristics of the Marshall potential in dogs.
BACKGROUND
The electrophysiological characteristics of the Marshall potential is important in ligament of Marshall (LOM) ablation.


RESULTS
Marshall potential was recorded under sinus rhythm and left atrial appendage (LAA) pacing and in the first randomly selected 5 dogs (Group 1), LOM ablation was performed. Histological examination was performed in the remaining 10 dogs, which were subdivided according to the results (Groups 2, 3). During LAA pacing in Group 2, the AM interval was prolonged or shortened, whereas in Group 3 it was prolonged (125+/-9 vs 80+/-6 ms, P=0.043, when the pacing rate =350) (126+/-9 vs 80+/-6 ms, P=0.0442, when the pacing rate =450). The Marshall potential was separated from the atrial electrogram by LAA pacing in Groups 2 and 3. There was no significant difference in the AM interval during sinus rhythm and right atrial appendage pacing.


CONCLUSIONS
Marshall potential has different forms on electrograms, including a prolonged AM interval, which presents with LAA pacing. This finding might be useful in LOM ablation.
Lei
Sen
S
Department of Cardiology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
Zhang
Bo
B
Wu
Jinjin
J
Liu
Zengzhang
Z
Zrenner
Bernhard
B
Yin
Yuehui
Y
D000818:Animals; D020517:Atrial Appendage / Q000473:pathology / Q000503:physiopathology; D001281:Atrial Fibrillation / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D017115:Catheter Ablation; D004195:Disease Models, Animal; D004285:Dogs; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000033:anatomy & histology / Q000502:physiology; D008022:Ligaments / Q000166:cytology* / Q000503:physiopathology*; D008297:Male; D009206:Myocardium / Q000166:cytology; D010138:Pacemaker, Artificial; D013612:Tachycardia, Ectopic Atrial / Q000473:pathology / Q000503:physiopathology / Q000601:surgery