Laser tissue interaction in direct myocardial revascularization.

This investigation examines the various laser choices used for transmyocardial laser revascularization (TMLR) with emphasis on the laser-tissue interaction. A series of in vivo (porcine model, n=27) and in vitro experiments were performed to study the effects of CO(2), holmium:YAG, and XeCl excimer lasers on the histological outcome of TMR channels. Computerized histopathological analysis has revealed that the CO(2) and holmium:YAG lasers produce substantial unpredictable thermal damage and differ predominantly in the amount of the mechanical injury or tissue shredding. In comparison, the excimer laser appears to produce the most uniform tissue ablation with the least thermal and shockwave damage.     

右胸小切口在心内直视手术中的应用

0　引言　我院自 1997- 0 8/ 1998- 12 ,对先天性心脏病 ,风湿性心瓣膜病患者应用右胸小切口和心脏不停跳法等微创技术在体外循环下完成心内直视手术 40例 ,全部获得成功 .1　对象和方法　全组 40 (男 12 ,女 2 8)例 ,年龄 2～ 31岁 ,平均 10 .5岁 .先天性心脏畸形包括房间隔缺损 14例 ,室间隔缺损 2 2例 ,部分型房室管畸形 1例 ,合并畸形有肺动脉瓣狭窄 ,右室流出道狭窄 ,部分肺静脉畸形引流各 1例 .风湿性心脏病3例 ,均为二尖瓣狭窄 ,其中 2例直视成形 ,1例换瓣 .所有病例均全麻 ,气管插管 ,右乳房下弧形切口 37例 ,右腋下直切口3例 .切口…