The fate of calf perforator veins after saphenous vein laser ablation.

PURPOSE We aimed to assess hemodynamic changes in calf perforator veins (PVs) after endovenous laser ablation (EVLA) of saphenous veins. METHODS The series comprised 60 limbs of 41 patients (27 female, 14 male; median age, 43 years [range, 22-78 years]) who underwent EVLA for varicose veins. All patients were prospectively evaluated by means of color Doppler ultrasonography before and after the procedure. RESULTS EVLA did not change the rate of incompetent PVs (preoperatively, 154/483 [32%] vs. postoperatively, 167/501 [33%]; P = 0.173), but significantly increased the total number of all PVs (n=483 vs. n=501, P = 0.036). Following EVLA, 28% of the limbs had thrombosis of PVs, 34% had new US-detectable PVs, 42% showed new competency, and 52% showed new incompetency. New competent PVs were found more commonly in the medial leg (ablation site) than the lateral leg (nonablation site) (28.3% vs. 11.7%, P = 0.016), while new incompetent PVs were found more commonly in nonablation site than ablation site (31.7% vs. 18.3%, P = 0.086). Additionally, new competent PVs in the posterior leg were found more often in patients who had small saphenous vein ablation than patients who did not (30% vs. 0%, P = 0.002). CONCLUSION EVLA induces numerous changes in calf PVs. These changes seem to result from flow offloading in ablation site and onloading in nonablation site in the early postablation period.