Background: Effective lymphaticovenular anastomosis (LVA) requires identification of functioning lymphatics, which are not always visible with contrast-based imaging in advanced-stage lymphedema patients. Ultrasound (US) allows to identify preoperatively functioning lymphatic vessels even in limbs severely affected by lymphedema. Moreover, in our experience, we observed an interesting clinical sentry in advanced-stage lymphedema patients, the hand/foot sign that is analyzed in this paper.
Patients and methods: From January 2016 to January 2019, 76 consecutive advanced-stage secondary lymphedema patients underwent LVA. Preoperative planning included lymphoscintigraphy, indocyanine-green lymphography (ICG-L) and US. Patients' features, the hand/foot sign (preservation of more normal skin on the dorsum of the hand or foot), lymphatic degeneration, quantitative, qualitative, and composite outcomes at 1-year follow-up were evaluated.
Results: An average number of 3±0.1 LVA was performed in upper limb lymphedema (ULL) (range 2-5, 47 patients) and of 4±1.08 LVAs in lower limb lymphedema (LLL) cases (range 4-7, 29 patients). The composite outcome was positive in 45 cases (59.7%). The "negative" hand /foot sign was significantly associated with presence of functioning lymphatic channels. The incidence of adverse outcomes was significantly higher in patients with positive hand/foot sign.
Conclusion: Patients with no functioning lymphatic vessels detectable by lymphoscintigraphy and ICG-L may still have functioning lymphatic channels that can be identified preoperatively by ultra-high-frequency ultrasound and salvaged by LVA. The "hand/foot sign" is a simple clinical sentry that appears to be correlated with higher probability of being able to localize functional lymphatics for potential lymphovenous bypass surgery.
Keywords: LVA; high frequency; lymphaticovenous bypass; lymphedema; lymphovenous bypass; lymphovenous shunt; supermicrosurgery; ultrahigh frequency; ultrasound.
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