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This consensus statement of Russian experts is based on a review of the relevant literature on the prevalence, diagnosis, and treatment of non-thrombotic and post-thrombotic venous obstruction, as well as management of patients after venous stenting. In the Part 1 we discussed the clinical manifestations of venous obstruction, the role of duplex ultrasound scan, CT venography, MR venography, direct venography, and intravascular ultrasound scan, as well as typical findings obtained by using these methods. The authors mentioned the functional assessment of venous outflow in healthy subjects and in those with obstruction and changes in them after the intervention. In conclusion, the authors formulated the suggestions for clinical recommendations on the diagnosis of chronic venous obstruction.