Abstract We analyzed the different effects of CO 2 , Nd‐YAG, and argon lasers on aorta by using a Thermovision infrared system that registered the laser interaction with mongrel dog aorta. The images (thermograms) obtained were processed by a computer, which associated each area of the same temperature with a determined color. These thermograms were compared to histological analysis of the respective samples and the following results were obtained: (1) After the application of each laser there is very little propagation of heat in tissue. (2) The CO 2 laser makes tissue reach 100°C in less than 0.05 seconds. (3) The heat dissipation time was higher with the Nd‐YAG laser due to higher scattering on tissue. Based on this research we conclude that the CO 2 laser was best absorbed, the Nd‐YAG laser penetrated human tissue with the best results, and the argon laser had the most significant backscattering.

Biological tissue

Gas laser

10.1002/lsm.1900070405

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Citations (10)

[Preliminary results of the measurement of the regurgitation fraction, in experimental aortic insufficiency, by means of a radioactive indicator].

PubMed (1966)

E Armelin N Carvalho Neto Ad

Fraction (chemistry)

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Vascular anastomosis by argon laser beam.

PubMed (1983)

O.M. Gomes R Macruz E Armelin M Ribeiro M José M. Brum

Twenty-four mongrel dogs, weighing 13 to 24 kg, were used to study the effectiveness of anastomosis by Argon Laser beam. After anesthesia, intubation and controlled ventilation, they were submitted to three types of vascular anastomoses: saphenous vein intercarotid artery bypass; left mammary artery/left anterior descending coronary artery bypass; and veno-venous anastomosis. In all groups, 0.8 to 1.5 watts of Argon Laser power were applied for a total time of 90 to 300 seconds. The lower power was for veno-venous anastomoses and the greater was applied for arterial anastomoses. The mean values of resistance of the laser anastomosis to pressure-induced repture were 730 mm Hg in the immediate postoperative study, but increased to 2,500 mm Hg 30 days after surgery. No signs of occlusion were demonstrated at the anastomotic sites by the angiographic and anatomopathological studies performed.

Surgical anastomosis

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Citations (47)