Browsing by Author "Ibanez, Samuel"

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    Dermoscopy as a clinical tool for the diagnosis of demodicosis: a retrospective intrapatient case-control study
    (2024) Parra-Cares, Julio; Meza-Romero, Rodrigo; Ibanez, Samuel; Canales, Marilena; Concha, Monica; Navarrete-Dechent, Cristian; Abarzua-Araya, Alvaro
    Dermoscopy has been used for the non-invasive diagnosis of demodicosis. Several studies have evaluated the usefulness of this tool in the diagnosis, however, there are differences in the gold standard (SSSB or KOH test) and criteria of positivity used between studies. Added to this, is the lack of controls and objective quantification of the usefulness of dermoscopic signs in clinically observable and relevant ranges. To validate the usefulness of dermoscopy for the diagnosis of demodicosis by calculating the performance indicators for the different dermoscopic signs. Retrospective intrapatient case-control study, which included adults with suspicion of demodicosis. Dermoscopic photographs and scraping of healthy and lesional skin were obtained. Samples were analyzed microscopically by trained personnel. Photographs were evaluated by determining the presence of Demodex tails (DT), dilated follicular openings (DFO) and dilated blood vessels (DBV) in pre-defined ranges. 64 patients were included (total = 256 samples); the presence of demodex on skin scraping was seen in 69%. Under dermoscopy, the presence of DT in range 11-20/field had a positive likelihood ratio (LR) of 12.10 (95%CI 6.52-22.45) and negative LR 0.32 (95%CI 0.23-0.45). Combined and dichotomized performance for at least one positive sign under dermoscopy (DT > 10/field, DFO > 10/field or DBV > 50% of the field): positive LR 7.14 (95%CI 4.80-10.62) and negative LR 0.11 (95%CI 0.06-0.22). The presence of DT, DFO or DBV has a high correlation with a positive mite test, so the diagnosis of demodicosis could be made only through dermoscopy.
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    Effect of acute on chronic liver failure over post-transplant survival
    (2023) Benitez, Carlos; Arnold, Jorge; Cambindo, Veronica; Schoenfeldt, Fernanda; Cancino, Alejandra; Ibanez, Samuel; Grandy, Catalina; Hunfan, Paola; Gonzalez, Jorge; Guerra, Catalina; Godoy, Esteban; Araneda, Veronica; Mollo, Constanza; Poniachik, Jaime; Urzua, Alvaro; Cattaneo, Maximo; Roblero, Juan Pablo; Oppenheimer, Ilan; Pizarro, Vicente
    Introduction and Objectives: Acute-on-chronic liver failure (ACLF) is associated with reduced short-term sur-vival, and liver transplantation is frequently the only therapeutic option. Nonetheless, the post-transplanta-tion prognosis seems to be worse in ACLF patients.Materials and Methods: The databases of two university centers were retrospectively evaluated, and adult patients with cirrhosis who underwent transplantation between 2013 and 2020 were included. One-year survival of patients with ACLF was compared to that of patients without ACLF. Variables associated with mor-tality were identified.Results: A total of 428 patients were evaluated, and 303 met the inclusion criteria; 57.1% were male, the mean age was 57.1 +/- 10.2 years, 75 patients had ACLF, and 228 did not. The main etiologies of ACLF were NASH (36.6%), alcoholic liver disease (13.9%), primary biliary cholangitis (8.6%) and autoimmune hepatitis (7.9%). Mechanical ventilation, renal replacement therapy, the use of vasopressors and the requirement of blood product transfusion during liver transplantation were significantly more frequent in ACLF patients. Among those recipients without and with ACLF, survival at 1, 3 and 5 years was 91.2% vs. 74.7%, 89.1% vs. 72.6% and 88.3% vs. 72.6%, respectively (p=0.001). Among pre-transplantation variables, only the presence of ACLF was independently associated with survival (HR 3.2, 95% CI: 1.46-7.11). Post-transplantation variables indepen-dently associated with survival were renal replacement therapy (HR 2.8, 95% CI: 1.1-6.8) and fungal infec-tions (HR 3.26, 95% CI: 1.07-9.9).Conclusions: ACLF is an independent predictor of one-year post-transplantation survival. Importantly, trans-plant recipients with ACLF require the use of more resources than patients without ACLF. (c) 2023 Fundacion Clinica Medica Sur, A.C. Published by Elsevier Espana, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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    Universal Access to On-Demand Treatment of Patients with Hereditary Angioedema, the Chilean Experience
    (2023) Escobar, Juan J.; Aguirre, Joaquin; Ibanez, Samuel; Cid, Barbara J.; Campillay, Rolando; Gallardo, Ana Maria; Grau, Masumi; Hoyos-Bachiloglu, Rodrigo
    Background: In Chile, patients with hereditary angioedema (HAE) type I and type II are protected under Ley Ricarte Soto (LRS), which guarantees access to on demand plasma-derived C1-INH (pdC1-INH) since 2018. We aimed to analyze the first 3 years of LRS.Methods: Review of the LRS database between 2018 and 2021.Results: During the study period, 154 patients were covered by LRS, with an estimated prevalence of HAE in Chile at 0.8:100,000 inhabitants. A delay in diagnosis of 22 years was noted, 50 patients received epinephrine during an attack before the diagnosis of HAE. Mean number of attacks per year was 8, with 50% of adults and 42% of children experiencing more than 1 attack per month.Conclusion: Disease awareness must improve to reduce the diagnostic delay of HAE. Long-term prophylactic medications should be included in LRS to treat patients with high attack rates and control the costs of frequent on-demand treatment with pdC1-INH.