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Interstitial Nd:YAG laser coagulation with a cylindrical diffusing fiber tip in experimental liver metastases
Author(s) -
van Hillegersberg R.,
van Staveren H. J.,
Kort W. J.,
Zondervan P. E.,
Terpstra O. T.
Publication year - 1994
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/1096-9101(1994)14:2<124::aid-lsm1900140205>3.0.co;2-3
Subject(s) - coagulative necrosis , laser , lesion , pathology , electron microscope , chemistry , medicine , optics , physics
Interstitial laser coagulation as a means of destructing hepatic metastases was investigated. Colon carcinoma CC531 was implanted in the liver of 42 Wag/Rij rats; 20 days later, tumors (5.5±0.2 mm) were exposed to 1,064 nm Nd:YAG laser light at 4 W/cm and either 600, 1,200, 2,400, 3,400, or 4,800 J/cm from a 0.5 cm Helioseal® coated cylindrical diffuser. Temperature and fluence rate were measured at the tumor boundary. Lesions were studied on day 2 and 36 posttreatment by light microscopy. Tumor proliferative activity was assessed by bromodeoxyuridine incorporation. Liver damage and function were determined by serum liver enzymes and antipyrine clearance. Fluence rate increased during laser treatment up to 170%; mean temperature increased logarithmically up to 69.7°C. Short‐term light microscopy showed coagulation necrosis of 7–11 mm without charring. Lesion size and liver enzymes increased logarithmically with laser energy applied. No deterioration in liver function was found. At 4,800 J/cm complete tumor remission occurred in three of four animals. This study shows the ability of interstitial laser coagulation to produce selective destruction of colonic tumor within the liver. © 1994 Wiley‐Liss, inc.