skip to main content

Electrogram-Gated Radiofrequency Ablations With Duty Cycle Power Delivery Negate Effects of Ablation Catheter Motion

Chik, William W.B. ; Barry, Michael Anthony ; Pouliopoulos, Jim ; Byth, Karen ; Midekin, Christine ; Bhaskaran, Abhishek ; Sivagangabalan, Gopal ; Thomas, Stuart P. ; Ross, David L. ; Mcewan, Alistair ; Kovoor, Pramesh ; Thiagalingam, Aravinda

Circulation: Arrhythmia and Electrophysiology, 10/2014, Vol.7(5), pp.920-928 [Peer Reviewed Journal]

Full text available

Citations Cited by
  • Title:
    Electrogram-Gated Radiofrequency Ablations With Duty Cycle Power Delivery Negate Effects of Ablation Catheter Motion
  • Author: Chik, William W.B. ; Barry, Michael Anthony ; Pouliopoulos, Jim ; Byth, Karen ; Midekin, Christine ; Bhaskaran, Abhishek ; Sivagangabalan, Gopal ; Thomas, Stuart P. ; Ross, David L. ; Mcewan, Alistair ; Kovoor, Pramesh ; Thiagalingam, Aravinda
  • Subjects: Medicine
  • Is Part Of: Circulation: Arrhythmia and Electrophysiology, 10/2014, Vol.7(5), pp.920-928
  • Description: BACKGROUND: Cardiac and respiratory movements cause catheter instability. Lateral catheter sliding over target endocardial surface can lead to poor tissue contact and unpredictable lesion formation. We describe a novel method of overcoming the effects of lateral catheter sliding movements using an electrogram-gated pulsed power ablation.METHODS AND RESULTS: All ablations were performed on a thermochromic gel myocardial phantom. Ablation settings were randomized to conventional (nongated) 30 W versus electrogram-gated at 20% duty cycle (30 W average power) at 0-, 3-, 6-, and 9-mm lateral sliding distances. Forty-eight radiofrequency ablations were performed. Deeper lesions were created in electrogram-gated versus conventional ablations at 3 mm (4.36±0.08 versus 4.05±0.17 mm; P=0.009), 6 mm (4.39±0.10 versus 3.44±0.15 mm; P<0.001), and 9 mm (4.41±0.06 versus 2.94±0.16 mm; P<<0.001) sliding distances. Electrogram-gated ablations created consistent lesions at a quicker rate of growth in depth when compared with conventional ablations (P<0.001).CONCLUSIONS: (1) Lesion depth decreases and length increases in conventional ablations with greater degrees of lateral catheter movements; (2) electrogram-gated pulsed radiofrequency delivery negated the effects from lateral catheter movement by creating consistently deeper lesions irrespective of the degree of catheter movement; and (3) target lesion depths were reached significantly faster in electrogram-gated than in conventional ablations.
  • Language: English
  • Identifier: ISSN: 1941-3149 ; E-ISSN: 1941-3084 ; DOI: http://dx.doi.org/10.1161/CIRCEP.113.001112

Searching Remote Databases, Please Wait