PMID: 9170125May 1, 1997Paper

Temperature guided radiofrequency catheter ablation of myocardium: comparison of catheter tip and tissue temperatures in vitro

Pacing and Clinical Electrophysiology : PACE
E KongsgaardJ P Amlie

Abstract

Temperature monitoring during RF ablation has been proposed as a means of controlling the creation of the lesion. However, in vivo studies have shown poor correlation between lesion size and catheter tip temperature. Thus, we hypothesized a difference between catheter tip and tissue temperatures during RF catheter ablation, and that this difference may depend on flow passing the ablation site, tip electrode length, and catheter-tissue orientation. In vitro studies were performed using four different ablation catheters (tip electrode length: 2, 4, or 6 mm) with a thermistor or a thermocouple as temperature sensor. Set temperature was 70 degrees C and pulse duration was 30 seconds. Pieces of porcine left ventricle were immersed in a bath of isotonic saline-dextrose solution at 37 degrees C. The ablation catheters were positioned perpendicularly, obliquely, or parallel to the endocardium. A temperature sensor was inserted from the epicardial side and positioned 1 mm beneath the catheter-tissue interface. Experiments were made with a flow of 200 mL/min passing the ablation site or with no flow. The catheter tip and tissue temperatures differed significantly (P < 0.0001) during ablation. This difference increased with time, with flo...Continue Reading

Citations

Jul 16, 2013·Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing·M FiekG Steinbeck
May 9, 2003·The Annals of Thoracic Surgery·Teresa SantiagoAna P Martins
Nov 26, 2002·Journal of Biomechanics·Young Bin ChoyJohn G Webster
May 27, 2003·Pacing and Clinical Electrophysiology : PACE·Kagari MatsudairaWarren M Jackman
Feb 3, 2005·Pacing and Clinical Electrophysiology : PACE·Li-Fern HsuMichel Haïssaguerre
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