An updated approach to the risk assessment and prevention of postoperative venous thromboembolism in varicose vein surgery

This narrative literature review is dedicated to the issue of individual risk assessment and prevention of postoperative VTE in patients undergoing lower limb varicose vein surgery. The registry-based CAPSIVS trial showed that the detection frequency of any forms of VTE after modern minimally invasive superficial vein surgery reaches 3.4%, of which only 0.5% are symptomatic. The current clinical guidelines regulate the individual risk assessment of postoperative thrombosis using the Caprini Risk Score (CRS). The first validation study resulted in a proposal of evidence-based approach to the phlebological patient stratification into risk groups according to the Caprini scores with 0–6 scores indicating the low risk, 7–10 scores – the moderate risk and 11 scores or more –the high risk, which differs significantly from approaches in other medical specialties. At the same time, the pharmacoprophylaxis may be appropriate in the groups of moderate and high risk, especially when simultaneous varicose tributary ablation and perforating vein interventions increasing the risk of VTEC 6–11 times are performed. The duration of pharmacoprophylaxis of postoperative venous thrombosis is essential to its efficiency, which should not be less than 7 days for the moderate VTE risk group and reach 30 days for the high VTE risk group. A single injection of parenteral anticoagulants on the day of surgery has been shown to be associated with an 8.8% incidence of postoperative thrombosis. The risk of postoperative thrombosis in patients with VTE in their past medical history, including prior varicothrombophlebitis is increased by 4.2 times, which requires that secondary pharmacoprophylaxis be prescribed for at least 30 days, and in some cases up to 3-6 months. At this stage, there is sufficient evidence to support the use of the Caprini Risk Score to assess the risk of postoperative VTE and prescribe adequate pharmacological prophylaxis in varicose vein surgery treatment.