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Theoretical and Experimental Investigations Prove Nd: YAG Laser Treatment to Be Safe

The safety of the application of the Nd:YAG laser for hemostasis in emergency gastro‐endoscopy when its irradiation is properly dosed is demonstrated on the basis of laboratory investigations as well as theoretical calculations on a mathematical model of internal scattering. The increased effectiveness of this laser compared with argon and CO2 lasers in producing in‐depth volume heating is shown to derive from the fortuitous combination of its low absorptivity with the scattering phenomenon.