4079The future of recurring restenosis prediction - Urinary cysteinyl leukotriene e4

Abstract Background Peripheral artery disease (PAD) is one of the common atherosclerosis manifestations. However endovascular treatment (percutaneous transluminal angioplasty - PTA) remains the most frequently applied treatment method, it is less successful in patients with recurrent restenosis. Even though the influence of cysteinyl eicosanoids on atherosclerosis progression is well-known, their role in restenosis after endovascular treatment has not been studied yet. Purpose The aim of this study was to establish prognostic features of urinary leukotrienes E4 (uLtE4) in occurrence of restenosis. Methods 180 patients admitted for PTA with lower limbs ischemia on 3 or 4 stage of Rutherford scale were recruited in this prospective innovative study. Urine samples were collected before intervention as well as 2 hours after and day after it. During control visits were performed 1,3,6 and 12 months after PTA including uLtE4 level measurement, evaluation of treatment success and complex assessment of restenosis basing on ankle-brachial index, Doppler ultrasound and general condition of patient. To perform the analysis all of patients were divided into 2 groups basing on presence of complications on each follow-up meeting: A-without restenosis; B-with restenosis. Results Significant differences in level of uLtE4 were observed between group A and B on 3-month (85.57 vs 157.64, p<0.002) 6-month (83.17 vs 158.28, p<0.001) and 12-month (76.81 vs 150.25, p<0.001) follow-up visits (Fig1). Patients with increased uLtE4 level in 1month had higher risk of restenosis in 3-month observation (OR=3.57, p=0.002) and elevated uLtE4 in 3-month follow-up increased the risk of restenosis in 6 months (OR=2.38, p=0.016). The same trend was observed in 6 months uLtE4 levels regarding 12-months restenosis however it wasn't statistically significant (OR=1.82, p=0.1). However post-operative uLtE4 were significantly higher compared to the pre-operative ones, they did not correlated with future restenosis in none of the follow-ups. Figure 1 Conclusions Our study shows that, elevated level of uLtE4 correlates with increased risk of restenosis occurrence in PAD patients after EVT. Leukotrienes rise can also predict the restenosis in the following months. These results confirms the role of inflammatory mediators in atherosclerosis and let us believe, that one day uLtE4 level may become the significant biomarker of complications after lower limbs endovascular treatment. Acknowledgement/Funding Grant of Polish Ministry of Science and Higher Education - “Best of the best 2.0” (S/FS0/0267)