Sirolimus for below the knee lesions: Mid‐term results of SiroBTK study

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Abstract
Objectives: To assess the safety and efficacy of sirolimus-eluting stents (SESs) in the treatment of severe intermittent claudication and critical limb ischaemia with “below-the-knee” lesions, unsuitable for surgery. Background: Limited published evidence suggests that drug-eluting stents may offer significant improvements in the treatment of infrapopliteal lesions. Methods: Thirty consecutive patients with either severe intermittent claudication or critical limb ischemia (CLI), category 3–6 of Rutherford classification, and multivessel disease of infrapopliteal arteries (≥2 vessels) were treated with SES. Sixty-two arteries were treated with 106 SES. Mean age was 73.9 years, 77% of patients were male and 36% diabetic. The primary endpoint was clinical improvement and healing of ulcers at short term (1 month) and mid term (7.7 months). The secondary endpoint was primary vessel patency rate (angiographic or duplex assessment). All patients received clopidogrel (75 mg daily) or ticlopidine (150 mg daily) for 2 months or longer. Results: Angiographic and procedural success was achieved in all patients. At 7 months (7.7 ± 5.8), it was necessary to amputate 1 toe in one patient and 1 mid-foot in another. Limb salvage was obtained in 100% of patients. Other events were: two cardiac deaths unrelated to CLI, one stroke with hemiparesia, one initial reperfusion syndrome, one contralateral CLI, and three recurrent homolateral claudication cases. All surviving patients had a mid-term clinical improvement with 97% of primary patency (56 patent arteries on 58 arteries). Conclusion: Treatment of “below-the-knee” lesions with SES may provide an alternative treatment for patients with CLI.

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