Mechanism of aneurysm formation after 830-nm diode-laser-assisted microarterial anastomosis.

OBJECTIVE

The process of aneurysm formation after laser welding is described.

SUMMARY BACKGROUND DATA

The mechanism of aneurysm formation after laser-assisted microarterial anastomosis is presently unclear.

METHODS

A series of 830-nm diode-laser-assisted longitudinal aortorrhophy with a condition of 400 to 500 J/mm2 for 1 cm length of anastomosis versus conventional manual anastomoses were performed in 90 Wistar rats. To compare this technique with normal media process, a histologic examination of aneurysm formation was conducted.

RESULTS AND CONCLUSIONS

The results show that there are two important factors that cause aneurysm formation after laser-assisted anastomosis: 1) the vessel wall is damaged by laser heating; 2) proliferation of collagen fiber at the adventitia is absent during media reconstruction.