The article discusses the nature of the occurrence of a pulse wave, and demonstrates its changes after regional anesthesia of the upper limb. The study involved 30 patients who underwent axillary brachial plexus block under ultrasound guidance. All study participants underwent pulse wave recording by photoplethysmography at the level of the index finger on both hands until anesthesia was performed and in the interval between 10 and 20 minutes after the end of the anesthesia procedure, followed by fixation on paper. Anesthesia was performed with a 1.5 % lidocaine solution with adrenaline added in a ratio of 1:200 000. After anesthesia in group I, an increase in the amplitude of the pulse wave, an increase in the class of the pulse wave, a decrease in the saturation of peripheral blood, an increase in the ratio of the angles of alpha and beta were recorded in comparison with group II. The authors declare the promise of this methodology in order to further confirm the success of the regional block.
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