58-year-old requesting foam for GSV reflux with distal SSV disease — occlusion honesty, durability discounting, and the nerve plan

Examiner prompts and model answers

His friend had foam in a lunch hour — is foam equal for his great saphenous trunk? No: quote the Dutch 3-arm (240 patients) — 1-year anatomic success 88.5% laser, 88.2% surgery, 72.2% foam — with complications low and equal, so foam trades 16 points of occlusion for convenience.^[17] Price the long term with the 14-year cohort (233 randomised, 214 analysed): foam carries 11.7-fold reflux risk against stripping and 5.0-fold against laser with reinterventions at 56.4 versus 13.2 versus 8.2%, while quality of life stays tied — the lunch hour is bought with repeat procedures.^[29] Add CLASS honesty (798 patients): foam gains less AVVQ than surgery (−1.74) with complications at 7% against 1% laser — so consent foam as effective-but-repeatable, never as occlusion-equal.^[15]

He wants mechanochemical ablation to avoid tumescent injections — what durability discount do you quote? The LAMA 5-year (150 patients): occlusion 91 versus 47% favouring laser over mechanochemical, reintervention 8 versus 21%, with quality of life tied only after the extra procedures.^[27] The 7-year (125 treated, 71.2% seen): proximal reflux 23% after mechanochemical against 7% after thermal, with reoperations only on the mechanochemical side between years 3 and 7.^[28] Offer mechanochemical for its tumescence-free profile with reintervention honesty — durability, not comfort, separates it from thermal.^[27][28]

Bulky tributaries — together or staged? Together by default: 6 randomised trials with 432 patients show immediate tributary treatment with truncal ablation cuts reintervention to one-third (RR 0.33) with better short- and longer-term scores and no safety penalty.^[26]

He waves away the nerve discussion for the distal small saphenous trunk — what stops you? The anatomy: in 20 specimens the sural nerve sits within 5 mm in 70% of proximal and 90% of distal legs, with fascia shielding in 95% proximally but only 15% distally — the proximal third is the optimal thermal zone, and the tibial nerve averages 4.4 mm at the junction.^[38] Consent heat-thrombosis explicitly: across 405 flush-laser limbs success is 96.78% with significant extension at 2.5% class-3 plus 0.2% class-4 and complete 4-week resolution with zero embolism or thrombosis observed — plus 1–2 weeks of low-molecular-weight heparin for high-thrombosis-risk legs by consensus.^[36][37] Finally, warn the wide trunk: clinical class (OR 2.1) and diameter (OR 1.8) top 1-year recanalisation prediction across 1226 legs with 11% recanalised — so measure the diameter before promising permanence.^[39]