An original technique has been developed for the biomicroscopy of small-intestine mesentery blood vessels in rats. Using this method, specific features of mic- rocirculatory process disturbances caused by isoniazid in high doses have been elucidated for the first time. It is established that intragastric introduction of iso- niazid (single daily dose of 542 mg/kg for 6 days) leads to pronounced disturbances of the microcirculatory process, accompanied by intravascular aggregation of erythrocytes, stasis, destructive changes in vessel walls, diapedesis, and hemorrhage over an area of (1.9-9.9) x 10⁻³ mm².
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