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- Contralateral carotid stenosis is a predictor of long-term adverse events in carotid endarterectomyPublication . Moreira, Rita; Duarte-Gamas, Luís; Pereira-Macedo, Juliana; Pereira-Neves, António; Domingues-Monteiro, Diogo; Jácome, Filipa; Andrade, José P.; Marreiros, Ana; Rocha-Neves, JoãoContralateral carotid stenosis (cICS) has been described as a perioperative predictor of mortality after carotid endarterectomy (CEA). However, its predictive value on long-term cardiovascular events remains controversial. The study aims to assess the potential role of cICS as a long-term predictor of major adverse cardiovascular events (MACE) in patients who underwent CEA. From January 2012 to July 2020, patients undergoing CEA under regional anesthesia for carotid stenosis in a tertiary care and referral center were eligible from a prospective database, and a post hoc analysis was performed. The primary outcome consisted in the occurrence of long-term MACE. Secondary outcomes included all-cause mortality, stroke, myocardial infarction, acute heart failure, and major adverse limb events. A total of 192 patients were enrolled. With a median 50 months follow-up, chronic kidney disease (CKD) (mean survival time (MST) 51.7 vs. 103.3, P < 0.010) and peripheral artery disease (PAD) (MST 75.1 vs. 90.3, P = 0.001) were associated with decreased survival time. After propensity score matching (PSM), CKD (MST 49.1 vs. 106.0, P = 0.001) and PAD (MST 75.7 vs. 94.0, P = 0.001) maintained this association. On multivariate Cox regression analysis, contralateral stenosis was associated with higher MACE (hazard ratio (HR) = 2.035; 95% CI: 1.113-3.722, P = 0.021 and all-cause mortality (HR = 2.564; 95% CI: 1.276-5,152 P = 0.008). After PSM, only all-cause mortality (HR 2.323; 95% CI: 0.993-5.431, P = 0.052) maintained a significant association with cICS. On multivariable analysis, cICS (aHR 2.367; 95% CI: 1.174-4.771, P = 0.016), age (aHR 1.039, 95% CI: 1.008-1.070), CKD (aHR 2.803; 95% CI: 1.409-5.575, P = 0.003) and PAD (aHR 3.225, 95% CI: 1.695-6.137, P < 0.001) were independently associated with increased all-cause mortality. Contrary to MACE, cICS is a strong predictor of long-term all-cause mortality after CEA. However, MACE risk may compromise CEA benefits by other competitive events. Therefore, further studies are needed to establish the role of cICS on postoperative events and on patients' specific assessments in order to determine the best medical treatment and easy access to surgical intervention.