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Ann Thorac Surg 2005;80:887
© 2005 The Society of Thoracic Surgeons

Original article: Cardiovascular

Invited commentary

Stuart P. Thomas, BMed, PhD

Department of Cardiology, Westmead Hospital, University of Sydney, Westmead, NSW 2145 Australia

(Email: stuartpt@yahoo.com).

The first 20% of the full text of this article appears below.

Most currently used devices for forming linear thermal lesions in the myocardium employ radiofrequency energy. The main mechanism for heating is ohmic (resistive). The direct heating effect reduces at a rate approximately proportional to the inverse of the fourth power of the radial distance from the electrode during unipolar ablation. Thus, during epicardial ablation with unipolar electrodes, effective direct resistive heating occurs only in a very thin rim of tissue very close to the epicardial surface. Lesion extension . . . [Full Text of this Article]






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