Factors affecting the evolution of type III shunts of the greater saphenous vein after the first step of the CHIVA 2 strategy

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The CHIVA 2 strategy is a two-step surgical procedure for treating type III venous-venous shunts in the territory of the Greater Saphenous Vein (GSV). The first step consists of disconnecting the incompetent GSV tributary, either N3 or N4. Once a new N2 re-entry perforator vein has developed, or the GSV incompetence has reached the pre-existing N2 re-entry perforator vein, both documented by the re-appearance of GSV reflux during the follow-up, the second step of the CHIVA 2 strategy, i.e. the closure of the saphenous-femoral junction, can be performed. In this paper we addressed the intriguing question of whether it was possible to identify the pre-operative factors able to favourably affect the hemodynamic stability of type III shunts of the GSVs treated by the only first step of the CHIVA 2 strategy. Our data show that the pre-operative GSV anterograde flow, detectable all along the GSV course even soon after the first step of the procedure, plays a pivotal role in ensuring the hemodynamic stability of the treated GSV, which may not need the second step up to 45% of cases.