高周波発生装置の周波数および機種の相違によるカテーテル心筋焼灼術の組織変化に関する基礎的研究

An Experimental Study on the Alteration of Myocardial Tissue by Radiofrequency Catheter Ablation Differences according to the Frequency and the Device

　高周波を用いたカテーテル心筋焼灼術の周波数および機種の相違による心筋の組織変化を比較検討した．

　高周波発生装置として，定電圧式のLL−49（0.49 MHz），定電力式のRA−50（13.56 MHz）と温度設定機能を有する定電力式のHAT 200（0.52 MHz）を用いた．一定の出力および通電時間で犬から摘出された右室心筋に対して，多極電極カテーテルの先端から単極通電を行った後，心筋の組織変化を観察し，さらに焼灼層（心内膜面と最大深達径）を定量的に評価した．

To evaluate the alteration of myocardial tissue by radiofrequency (RF) catheter ablation according to differences of the frequency and the device, we applied RF catheter ablation to canine right ventricular myocar-dium in vitro.

The devices delivering RF energy were LL-49 (0.49MHz, fixed voltage mode), RA-50 (13.56MHz, fixed watt mode) and HAT200 (0.52MHz, fixed watt mode with the capability of temperature adjustment).

After RF catheter ablation were perfomed with a unipolar electrode catheter at various output under the same condition of contact, the ablated lesions by each device were compared.