Browsing by Author "Navia, Alfonso "

Now showing 1 - 12 of 12
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    Aesthetic Scrotoplasty: Systematic Review and a Proposed Treatment Algorithm for the Management of Bothersome Scrotum in Adults
    (2020) Thomas, Claudio ; Navia, Alfonso
    Background Increased scrotal laxity is a poorly defined entity often associated with discomfort while wearing loose clothes, walking, doing sports and during intercourse. In our experience, this condition is produced by an enlarged scrotal bag hanging more than 1-2 cm below the tip of the penis and can be associated with persistent penoscrotal webbing. Our objective was to perform a systematic literature review addressing the diversity of this entity and its surgical treatment, as well as propose a diagnostic and therapeutic approach.
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    Desarrollo y validación de modelos de simulación en cirugía plástica.
    (2020) Navia, Alfonso; Dagnino, Bruno; Pontificia Universidad Católica de Chile. Escuela de Medicina
    Introducción: La otoplastía es un procedimiento para corregir orejas prominentes. La simulación ha adquirido gran relevancia en la educación médico-quirúrgica. Objetivos: Desarrollar un modelo de otoplastía a bajo costo y validarlo para su entrenamiento. Material y Métodos: Diseñamos un modelo sintético de oreja prominente. Se utilizó un método Delphi para crear una escala específica para otoplastía (EVOPUC) y un cuestionario de antropometría (CLA). Evaluamos diez participantes, 5 expertos (cirujanos plásticos) y 5 principiantes (estudiantes). Cada participante realizó una otoplastía que se registró en video y fue evaluada por 3 expertos ciegos utilizando una escala general (OSATS), EVOPUC, CLA y el tiempo operatorio. El grupo principiante realizó cuatro sesiones de entrenamiento con expertos. Fueron reevaluados utilizando la misma metodología. Los expertos completaron una encuesta de validez de apariencia y contenido. Resultados: El costo de cada modelo fue 5 dólares. Tras el entrenamiento, los novatos mejoraron significativamente su desempeño (p <0.05), comparables a los expertos. El 100% de los expertos calificó el modelo como muy útil, siendo considerado una herramienta para el entrenamiento de residentes. Conclusiones: Desarrollamos un modelo de otoplastía de bajo costo, logrando una adquisición significativa de habilidades en un grupo principiante, con resultados similares a cirujanos plásticos experimentados.
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    Evaluation of Research Opportunities and Limitations for Plastic Surgery Residents An International Survey
    (2021) Navia, Alfonso; Berner, Juan Enrique; Ramirez, Joaquin; Will, Patrick; Tejos, Rodrigo; Dagnino, Bruno; Searle, Susana; Cuadra, Alvaro
    Background Conducting research during specialty training provides an opportunity to develop critical thinking and leadership skills along with a better understanding of the scientific literature. However, trainees often find it difficult to undertake research, in the context of labor-intensive surgical training. The aim of this study is to evaluate the research output and limitations of plastic surgery residents in different countries. Methods An international cross-sectional study involving plastic surgery trainees and recent postgraduates from Brazil, Chile, Germany, and the United Kingdom was conducted. A survey inquiring into academic productivity, limitations to conducting research, and working-hours patterns was distributed among eligible participants. Results From September to December 2019, 106 surveys were retrieved. Most respondents declared having participated in at least 1 project that resulted in a presentation or publication during their training (90.6% in national presentations, 68% international presentations, 67% in national publications, and 66% international publications). Having completed a previous research fellowship was associated with a statistically higher academic output (P < 0.05). Seventy-nine percent of respondents felt that their participation in research activities would have been greater if limiting factors had been addressed, including lack of time (72.5%) and insufficient supervision and mentoring (55%). Conclusions Optimizing plastic surgery trainees' participation in scientific research is beneficial both for residents and their mentors. Research fellowships can provide an opportunity for academically oriented trainees to further develop their research skills. Protected time and adequate mentoring can help not only to increase residents' research output, but also to recruit the next generation of academic plastic surgeons.
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    From presentation to publication: an 11-year comparison of aesthetic and reconstructive surgery research among Chilean plastic surgeons
    (2021) Tejos, Rodrigo; Navia, Alfonso; Berner, Juan Enrique; Searle, Susana; Yanez, Gonzalo; Dagnino, Bruno; Guerra, Claudio; Cuadra, Alvaro
    Background The transition from a presentation in a scientific conference to publication in an academic journal should be the ideal journey for a research project. This phenomenon is summarized in a conversion rate, which has been previously reported in the literature. The aim of this study was to determine the characteristics and conversion rate of Chilean authors' aesthetic and reconstructive research projects in a nationwide study. Methods Conference abstracts from the two official Chilean plastic surgery meetings released between 2008 and 2018 were analyzed. A bibliographic search of all published articles involving each Chilean plastic surgeon followed. This information was cross-referenced to obtain the conversion rates and time to publication for transferred studies. Fisher's exact test and Mann-Whitney test were used to establish statistical associations. Results Four hundred sixty-eight abstracts were included, and 227 articles were found in our bibliographic search. Of these, 82 were considered to qualify as transferred studies. Aesthetic surgery publications had a higher proportion of prospective design than reconstructive articles (34.6% vs 20.1% (p= 0.02)). Median time to publication was 15 months, with a longer delay for reconstructive articles (19.5 vs 13 (p= 0.035)). The 2008-2016 conversion rate index was 19.2%, which was significantly higher for aesthetic surgery studies (36.4% vs 11.9% (p< 0.001)). Conclusions Despite a smaller proportion of plastic surgery research being focused on aesthetic topics in our sample, they accounted for higher quality study design, shorter time to publication, and higher overall chances of publication following presentations in local meetings. Level of evidence: Not ratable.
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    Have We Passed the Peak? The COVID-19 Plastic Surgery Webinar Pandemic
    (2020) Navia, Alfonso ; Berner, Juan Enrique ; Pereira, Nicolas ; Reissis, Dimitris ; Rakhorst, Hinne; Cuadra, Alvaro
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    MicrosimUC: Validation of a Low-Cost, Portable, Do-It-Yourself Microsurgery Training Kit
    (2021) Navia, Alfonso ; Tejos, Rodrigo ; Canahuate, Sebastian ; Machuca, Eduardo ; Searle, Susana ; Cuadra, Alvaro ; Dagnino, Bruno
    Background Microsurgery depends largely on simulated training to acquire skills. Courses offered worldwide are usually short and intensive and depend on a physical laboratory. Our objective was to develop and validate a portable, low-cost microsurgery training kit.
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    Optimizing the Chicken Wing Anatomy: Nomenclature Review and Description for Microsurgery and Supermicrosurgery Training
    (2020) Navia, Alfonso ; Tejos, Rodrigo ; Yañez, Ricardo ; Cuadra, Alvaro ; Dagnino, Bruno
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    Plastic Surgery Training across Seven Continents: Results from the First Global Trainee Survey
    (2022) Lindqvist, Ebba K.; Noordzij, Niels; Chopra, Shiv; Navia, Alfonso; Cappuyns, Laura; Khalaf, Amr; Fernandez Diaz, Oscar F.; Enrique Berner, Juan; Monshizadeh, Linda; Murphy, Robert X.
    Background: Little is known about the demographics and ambitions of plastic surgery trainees and if these differ between regions. This study sought opinion from current and recently graduated plastic surgery trainees to map demographics, training structure, and ambitions of plastic surgery trainees worldwide.
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    Repair of Inferior Alveolar Nerve in Orthognathic Surgery Simulator (RIANOS): A Novel, Open-Source, Combined 3D Printed, and Ex-Vivo Chicken Sciatic Nerve Training Model
    (2024) Navia, Alfonso; Tapia Coron, Sebastián Andrés; Rojas Sepulveda, Maria Fernanda; Rojas, Francisco; Vargas Díaz, Alex Patricio; Guerra, Claudio; Cuadra, Alvaro; Searle Ferrari, Susana Valeria; Ramírez, Hernán; Teuber Lobos, Cristián Andrés
    Objective: Accidental transection of the inferior alveolar nerve (IAN) during bilateral sagittal split osteotomies (BSSO) has a reported incidence of up to 7%, determining important sensory disturbances in patients. Proper repair demands the need of microsurgical anastomosis skills. No previous training models have been described to simulate this. Therefore, we present a validated simulation model for intraoral repair of transected IAN.Methods: A CT scan of an orthognathic surgery patient was modified and a 3D model of a mandible with BSSO was printed. Chicken thigh anatomy was reviewed, and 2.5 mm sciatic nerves were dissected and mounted in the model. In order to simulate intraoral work depth, it was put inside a dental phantom or medical glove box. The model was tested by a group of experts (n = 12), simulating a transected IAN repair inside the mouth with both loupes and a double visor surgical training microscope. A survey was conducted to assess Face and Content validity.Results: The model was named RIANOS after Repair of Inferior Alveolar Nerve in Orthognathic Surgery Simulator. The printing cost of each model was approximately US$3 and the design file is open-source and available for download. All experts “Strongly Agreed” that the model was useful for training inferior alveolar nerve microsurgical repair and would consider implementing it with their residents.Conclusions: We developed a low cost, reproducible, open-source simulator for IAN injury repair training during BSSO. Face and Content validity was achieved through evaluation by a group of experts.
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    Resultados de un programa nacional de trasplante cardiaco pediátrico: fortalezas y debilidades. Results of a national program of pediatric heart transplantation: strengths and weakness.
    (2017) Becker Rencoret, Pedro Antonio; Besa, Santiago; Riveros, Sergio; González Foretic, Rodrigo Vicente; Navia, Alfonso; Dellepiane, Paulina; Springmüller P., Daniel; Urcelay Montecinos, Gonzalo
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    Validation of a synthetic simulation model of endoscopic rectus sheath plication
    (2024) Rojas, Maria Fernanda; Torres, Javier; Figueroa, Ursula; Varas, Julian; Achurra, Pablo; Navia, Alfonso; Cuadra, Alvaro; Searle, Susana
    Purpose Literature reviews outline minimally invasive approaches for abdominal diastasis in patients without skin excess. However, few surgeons are trained in endoscopic rectus sheath plication, and no simulated training programs exist for this method. This study aimed to develop and validate a synthetic simulation model for the training of skills in this approach under the Messick validity framework. Methods A cross-sectional study was carried out to assess the participants' previous level of laparoscopic/endoscopic skills by a questionnaire. Participants performed an endoscopic plication on the model and their performance was evaluated by one blinded observer using the global rating scale OSATS and a procedure specific checklist (PSC) scale. A 5-level Likert survey was applied to 5 experts and 4 plastic surgeons to assess Face and Content validity. Results Fifteen non-experts and 5 experts in abdominal wall endoscopic surgery were recruited. A median OSATS score [25 (range 24-25) vs 14 (range 5-22); p < 0.05 of maximum 25 points] and a median PSC score [11 (range 10-11) vs 8 (range 3-10); p < 0.05 of maximum 11 points] was significantly higher for experts compared with nonexperts. All experts agreed or strongly agreed that the model simulates a real scenario of endoscopic plication of the rectus sheath. Conclusion Our simulation model met all validation criteria outlined in the Messick framework, demonstrating its ability to differentiate between experts and non-experts based on their baseline endoscopic surgical skills. This model stands as a valuable tool for evaluating skills in endoscopic rectus sheath plication.