We applied low-power ultraviolet (UV) laser irradiation via a thin flexible optical fiber to an in vivo model of vasospasm using an intravascular transluminal approach. The surgically exposed left femoral arteries of a rabbit were constricted by norepinephrine. A quartz fiber of 400 microm in diameter was introduced into the artery via the right common carotid artery through a 2.5F catheter. The femoral artery lumen was then irradiated with a helium-cadmium laser (wavelength 325 nm, output power 8 mW) through the fiber for 30 s. The UV irradiation increased the mean luminal diameter by 85% in comparison to the precontracted state, while the increase was only 45% in a sham operation. A histopathologic examination revealed no thermal damage and an intact internal elastic lamina. These results suggest that intravascular transluminal irradiation with a low-power UV laser may thus have potentially clinical applications to reverse acute arterial vasospasm.
|Number of pages||8|
|Journal||Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering|
|Publication status||Published - 1999|
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