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Gastric cancer is a multifactorial disease with important genetic and environmental factors. It is the fifth most common cancer in incidence, and the fourth cause of death secondary to cancer. The incidence of early-onset gastric cancer is increasing worldwide, but clinical information on these patients has not been well established. We analyzed the association between age and clinical, endoscopic, and histopathological characteristics of gastric cancer at the time of diagnosis in a Latin American population. A retrospective and descriptive cross-sectional study was carried out using the database of the Gastroenterology Service of the Clínica Foscal and Clínica Foscal Internacional in Bucaramanga, Colombia. Between January 2016 and December 2019, 259 de novo gastric cancer cases were diagnosed, of which 36 patients (13.9%) were 40 years old or younger. In patients with early-onset gastric, the prevalence of gastric cancer diagnosis was lower in men. A family history of gastric cancer or any other neoplasm was not associated with a higher prevalence of gastric neoplasms. In young patients, vomiting and ascites were more common, the preferred anatomical location was the body of the stomach, and the Borrmann IV classification and the diffuse-type histology were more likely. Our study showed an approximation of the characteristics of early-onset gastric cancer in a Latin American population, where we observed that early-onset gastric cancer has different demographic, anatomical, and histological features than late-onset gastric cancer.

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BACKGROUND: Chronic limb-threatening ischemia (CLTI) represents the final stage of peripheral arterial disease. Approximately one-third of patients with CLTI are not eligible for conventional surgical treatments. Furthermore, patients with advanced stage of CLTI are prone to amputation and death. Thus, an effective therapeutic strategy is urgently needed. In this context, autologous bone marrow mononuclear cell (auto-BM-MNC) and allogeneic mesenchymal stem cells represent a promising therapeutic approach for treating CLTI. In this study, we compared the safety and beneficial therapeutic effect of auto-BM-MNC versus allogeneic Wharton jelly-derived mesenchymal stem cells (allo-WJ-MSCs) in diabetic patients with CLTI. METHODS: We performed a randomized, prospective, double-blind and controlled pilot study. Twenty-four diabetic patients in the advanced stage of CLTI (4 or 5 in Rutherford's classification) and a transcutaneous oxygen pressure (TcPO2) below 30 mmHg were randomized to receive 15 injections of (i) auto-BM-MNC (7.197 × 106 ± 2.984 × 106 cells/mL) (n = 7), (ii) allo-WJ-MSCs (1.333 × 106 cells/mL) (n = 7) or (iii) placebo solution (1 mL) (n = 10), which were administered into the periadventitial layer of the arterial walls under eco-Doppler guidance. The follow-up visits were at months 1, 3, 6, and 12 to evaluate the following parameters: (i) Rutherford's classification, (ii) TcPO2, (iii) percentage of wound closure, (iv) pain, (v) pain-free walking distance, (vi) revascularization and limb-survival proportion, and (vii) life quality (EQ-5D questionnaire). RESULTS: No adverse events were reported. Patients with CLTI who received auto-BM-MNC and allo-WJ-MSCs presented an improvement in Rutherford's classification, a significant increase in TcPO2 values‬, a reduction in the lesion size in a shorter time, a decrease in the pain score and an increase in the pain-free walking distance, in comparison with the placebo group. In addition, the participants treated with auto-BM-MNC and allo-WJ-MSCs kept their limbs during the follow-up period, unlike the placebo group, which had a marked increase in amputation. CONCLUSIONS: Our results showed that patients with CLTI treated with auto-BM-MNC and allo-WJ-MSCs conserved 100% of their limb during 12 months of the follow-up compared to the placebo group, where 60% of participants underwent limb amputation in different times. Furthermore, we observed a faster improvement in the allo-WJ-MSC group, unlike the auto-BM-MNC group. Trial registration This study was retrospectively registered at ClinicalTrials.gov (NCT05631444).

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Gastric cancer is a multifactorial disease with important genetic and environmental factors. It is the fifth most common cancer in incidence, and the fourth cause of death secondary to cancer. The incidence of early-onset gastric cancer is increasing worldwide, but clinical information on these patients has not been well established. We analyzed the association between age and clinical, endoscopic, and histopathological characteristics of gastric cancer at the time of diagnosis in a Latin American population. A retrospective and descriptive cross-sectional study was carried out using the database of the Gastroenterology Service of the Clínica Foscal and Clínica Foscal Internacional in Bucaramanga, Colombia. Between January 2016 and December 2019, 259 de novo gastric cancer cases were diagnosed, of which 36 patients (13.9%) were 40 years old or younger. In patients with early-onset gastric, the prevalence of gastric cancer diagnosis was lower in men. A family history of gastric cancer or any other neoplasm was not associated with a higher prevalence of gastric neoplasms. In young patients, vomiting and ascites were more common, the preferred anatomical location was the body of the stomach, and the Borrmann IV classification and the diffuse-type histology were more likely. Our study showed an approximation of the characteristics of early-onset gastric cancer in a Latin American population, where we observed that early-onset gastric cancer has different demographic, anatomical, and histological features than late-onset gastric cancer.

El cáncer gástrico es una enfermedad multifactorial con importantes factores genéticos y ambientales. Es el quinto cáncer más común en incidencia y la cuarta causa de muerte secundaria al cáncer. La incidencia del cáncer gástrico de inicio temprano está aumentando en todo el mundo, pero la información clínica sobre estos pacientes no está bien establecida. Analizamos la asociación entre la edad y las características clínicas, endoscópicas e histopatológicas del cáncer gástrico al momento del diagnóstico en una población latinoamericana. Se realizó un estudio retrospectivo y descriptivo de corte transversal utilizando la base de datos del Servicio de Gastroenterología de la Clínica Foscal y Clínica Foscal Internacional en Bucaramanga, Colombia. Entre enero de 2016 y diciembre de 2019 se diagnosticaron 259 casos de cáncer gástrico de novo, de los cuales 36 pacientes (13,9%) tenían 40 años o menos. En pacientes con enfermedad gástrica de inicio temprano, la prevalencia del diagnóstico de cáncer gástrico fue menor en los hombres. El antecedente familiar de cáncer gástrico o cualquier otra neoplasia no se asoció con una mayor prevalencia de neoplasias gástricas. En pacientes jóvenes fueron más frecuentes los vómitos y la ascitis, la localización anatómica preferida fue el cuerpo del estómago, siendo más probable la clasificación de Borrmann IV y la histología de tipo difuso. Nuestro estudio mostró una aproximación a las características del cáncer gástrico de inicio temprano en una población latinoamericana, donde observamos que el cáncer gástrico de inicio temprano tiene diferentes características demográficas, anatómicas e histológicas que el cáncer gástrico de inicio tardío.

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(Figura 1) Inspirada en la labor de la enfermería en la historia de la humanidad, y entregada como obsequio para el programa de Enfermería de la Universidad Autónoma de Bucaramanga (UNAB) en la celebración de sus 15 años, la obra muestra una enfermera con indumentaria que evoca las voluntarias francocanadienses de la Primera Guerra Mundial, con algunos rasgos fenotípicos de mujer latina en combinación anacrónica con la torre (UNAB), símbolo institucional de fondo. La guerra y el conflicto armado son situaciones presentes desde el inicio de la humanidad. En una guerra todos pierden y el único triunfo lo representan las vidas que se salvan. Las enfermeras en el mundo han sido determinantes para la derrota del coloso devorador de vidas que se alimenta de la codicia sempiterna y hegemónica promotora de la violencia política de los pueblos.

(Figure 1) Inspired by the work of nursing in the history of humanity, and given as a gift for the Nursing Program of the Autonomous University of Bucaramanga (UNAB) in the celebration of its 15th anniversary. The work exhibits a nurse in clothing that evokes the Franco-Canadian volunteers of the First World War, with some phenotypical features of a Latin woman in anachronistic combination with the tower (UNAB), an institutional symbol in the background. War and armed conflict are present situations since the beginning of humanity. In a war everyone loses and the only triumph is represented by the lives that are saved. Nurses in the world have been decisive for the defeat of the life-devouring colossus that feeds on the eternal greed and hegemonic promoter of the political violence of the peoples.

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Resumen Introducción: la fibrilación auricular no valvular es la arritmia cardiaca más frecuente en las personas mayores que se ha relacionado con diferentes desenlaces adversos, como el ataque cerebrovascular, el cual en el 80% de los casos se puede prevenir con anticoagulantes orales, beneficio que está condicionado por una adecuada adherencia terapéutica. Objetivo: determinar la adherencia al tratamiento anticoagulante en pacientes mayores de 65 años con fibrilación auricular no valvular y factores asociados. Método: estudio observacional analítico de corte transversal, realizado en la clínica de anticoagulación de la Fundación Oftalmológica de Santander, en el que se evaluó la adherencia terapéutica por la escala de Morisky 8 en 102 pacientes, con un promedio de edad de 76 años. Se analizaron variables sociodemográficas, clínicas, síndromes geriátricos y relacionadas con el sistema de salud, luego se realizó un análisis bivariado. Se aceptó como significancia estadística un valor de p < 0.05. Resultados: se encontró adherencia farmacológica baja en el 42,1%; el olvido en la toma de su medicamento (50%) fue el factor más frecuente. Aspectos relacionados con el sistema de salud, como la inconformidad con el despacho del medicamento anticoagulante (OR: 2,97; IC 95%: 1.1-8.2; p = 0,02) y el despacho inoportuno (OR: 5.85; IC 95%: 1.5-32.8; p = 0,005) fueron variables asociadas a baja adherencia terapéutica. La toma de antiagregantes plaquetarios (p = 0,04) y la polifarmacia (p = 0,04) se asociaron con adherencia farmacológica moderada y alta. Conclusiones: la prevalencia de baja adherencia al tratamiento farmacológico es significativa. Es necesario conocer algunos aspectos del sistema de salud que limitan la adherencia dado que impactan en la efectividad de los anticoagulantes orales en población mayor.

Abstract Introduction: non-valvular atrial fibrillation is the most common cardiac arrhythmia in the elderly and has been related to different adverse outcomes such as stroke, which in 80% of cases can be prevented with oral anticoagulants, a benefit that is conditioned by an adequate therapeutic adherence. Objective: to determine adherence to anticoagulant treatment in patients older than 65 years with non-valvular atrial fibrillation and associated factors. Methodology: cross-sectional analytical observational study conducted at the FOSCAL anticoagulation clinic. Therapeutic adherence was evaluated using the Morisky 8 scale in 102 patients, with an average age of 76 years. Sociodemographic, clinical, geriatric syndrome and health system-related variables were analyzed, then a bivariate analysis was performed. A value of p < 0.05 was accepted as statistical significance. Results: Low pharmacological adherence was found in 42.1%, whose main cause was forgetting to take their medication (50%), likewise, the variables associated with the health system with low adherence were disagreement with the dispatch of the anticoagulant medication (OR: 2.97; 95% CI: 1.1-8.2; p = 0,02) and untimely dispatch (OR: 5.85; CI 95% 1.5-32.8; p = 0,005). Taking antiplatelet agents (p = 0.04) and the presence of polypharmacy (p = 0.04) were associated with moderate and high pharmacological adherence. Conclusions: the prevalence of low adherence to pharmacological treatment is significant. It is necessary to know some aspects of the health system that limit adherence since they impact the effectiveness of oral antiocogulants in the elderly population.

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Introducción. La UNESCO define la bioética como el estudio sistemático, pluralista e interdisciplinario, para resolver los problemas éticos planteados por la medicina, las ciencias sociales y de la vida, comprendiendo lo relativo a los adelantos científicos aplicados a seres humanos y su relación con la biósfera. La UNESCO, asistida por un comité internacional de expertos, presentó en el 2016 el plan de estudios básico de bioética "The Bioethics Core Curriculum", orientado a fortalecer su enseñanza en ambientes universitarios. El objetivoprincipal de este manuscrito fue identificar los referentes conceptuales y los esfuerzos multilaterales para la inclusión de la bioética en los currículos, señalando su pertinencia para el mejoramiento continuo, el fortalecimiento de la enseñanza y la investigación en las ciencias biomédicas. Temas de reflexión. Referentes conceptuales vigentes, esfuerzos multilaterales en la enseñanza de la bioética, política nacional de ética de la investigación, bioética e integridad científica. Conclusiones. La bioética, como ciencia de la supervivencia, es un pilar fundamental para la práctica de las ciencias biomédicas. Es evidente la necesidad de formar y preparar de manera adecuada a los futuros profesionales, líderes de opinión, académicos, investigadores, políticos y tomadores de decisiones en aspectos bioéticos, con el propósito de mejorar y fortalecer la formulación de referentes bioéticos en la práctica biomédica y la investigación en ciencias de la salud.

Introduction. UNESCO defines bioethics as the systematic, pluralist, and interdisciplinary study to resolve the ethical problems posed by medicine, social sciences, and life, understanding matters related to scientific progress applied to human beings and their relationship with the biosphere. In 2016, UNESCO, aided by an international committee of experts, presented "The Bioethics Core Curriculum", aimed at strengthening its teaching in universities environment. The main objective of this manuscript was to identify the conceptual references and multilateral efforts for the inclusion of bioethics in curricula, indicating their relevance for continuous improvement, strengthening of teaching, and research in biomedical sciences. Topics of reflection. Current conceptual references, multilateral efforts in bioethics teaching, national research ethics, bioethics, and scientific integrity policy. Conclusions. Bioethics, as a survival science, is a fundamental pillar for the practice of biomedical sciences. The need to educate and adequately prepare future professionals, opinion leaders, academics, researchers, politicians, and decision makers in aspects of bioethics is obvious, in order to improve and strengthen the formulation of bioethical references in biomedical practice and research in healthcare sciences

Introdução. A UNESCO define bioética como o estudo sistemático, pluralista e interdisciplinar para resolver os problemas éticos colocados pela medicina, ciências sociais e da vida, incluindo questões relacionadas aos avanços científicos aplicados ao ser humano e sua relação com a biosfera. A UNESCO, auxiliada por um comitê internacional de especialistas, apresentou em 2016 o currículo básico de bioética "The Bioethics Core Curriculum", visando fortalecer seu ensino em ambientes universitários. O objetivo principal deste manuscrito foi identificar as referências conceituais e os esforços multilaterais para a inclusão da bioética nos currículos, apontando sua relevância para a melhoria contínua, fortalecimento do ensino e da pesquisa em ciências biomédicas. Tópicos de reflexão. Referências conceituais atuais, esforços multilaterais no ensino de bioética, política nacional de ética em pesquisa, bioética e integridade científica. Conclusões. A bioética, como ciência da sobrevivência, é um pilar fundamental para a prática das ciências biomédicas. Fica evidente a necessidade de formar e preparar adequadamente futuros profissionais, formadores de opinião, acadêmicos, pesquisadores, políticos e tomadores de decisão em aspectos bioéticos, com o objetivo de melhorar e fortalecer a formulação de referências bioéticas na prática biomédica e na pesquisa em ciências da saúde.

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Introducción. La anestesia regional es una técnica importante, innovadora y popular para el manejo anestésico y analgésico. En el bloqueo supraclavicular del plexo braquial existe incidencia 50-60% de parálisis diafragmática. La presentación clínica es variable de acuerdo con factores externos e internos del paciente. Existen múltiples técnicas radiológicas en el diagnóstico, siendo de gran utilidad la ecografía por su fácil acceso. El objetivo es determinar la incidencia de parálisis diafragmática secundaria a bloqueo supraclavicular del plexo braquial guiado por ecografía en una institución de cuarto nivel. Metodología. Estudio analítico, longitudinal, prospectivo; se seleccionaron 110 pacientes. Criterios de inclusión: pacientes mayores de 18 años sometidos a cirugía de miembro superior con bloqueo supraclavicular de plexo braquial. Criterios exclusión: pacientes ASA (American Society of anesthesiologist) 4 y 5, gestantes, IMC >35 kg/m2, pacientes con antecedentes neuromusculares, enfermedad pulmonar restrictiva u obstructiva, parálisis nervio frénico o disfunción diafragmática. Se realizó un análisis mediante test estadísticos, describiendo los diferentes grados de parálisis diafragmática. Resultados. En los pacientes que cumplieron con los criterios de inclusión, la incidencia de parálisis diafragmática fue de 65% (37% parálisis total y 28% parcial), el 1.81% presentó síntomas respiratorios sin cambios hemodinámicos. Discusión. El bloqueo del plexo braquial por vía supraclavicular es una técnica relacionada con parálisis diafragmática, la ecografía ha permitido reducir la incidencia de esta complicación, es un método útil en el diagnóstico postoperatorio. Conclusiones. La parálisis diafragmática post bloqueo plexo braquial supraclavicular es una complicación observada principalmente en pacientes con previo compromiso pulmonar, por lo cual es de importancia la vigilancia estricta.

Introduction. Regional anesthesia is an important, innovative, and popular technique for anesthetic and painkiller management. In supraclavicular brachial plexus blockade, there is a 50-60% rate of diaphragmatic paralysis. Clinical presentation is variable according to the patient's internal and external factors. There are multiple radiological techniques in diagnosis, with ultrasounds being very useful due to their easy access. The objective is to determine the incidence of diaphragmatic paralysis secondary to supraclavicular brachial plexus blockade guided by ultrasound in a fourth level institution. Methodology. Prospective, longitudinal, analytical study. 110 patients were selected. Inclusion criteria: patients over 18 years of age subject to upper limb surgery with supraclavicular brachial plexus blockade. Exclusion criteria: ASA (American Society of Anesthesiologists) 4 and 5 patients, pregnant women BMI >35 kg/m2 patients with neuromuscular background, restrictive or obstructive pulmonary disease, phrenic nerve paralysis, or diaphragmatic dysfunction. An analysis was carried out via statistical tests, describing the different degrees of diaphragmatic paralysis. Results. In patients who met the inclusion criteria, the incidence of diaphragmatic paralysis was 65% (37% with total and 28% with partial paralysis), 1.81% showed respiratory symptoms without hemodynamic changes. Discussion. Supraclavicular brachial plexus blockade is a technique related to diaphragmatic paralysis. Ultrasound has allowed for the incidence of this complication to be reduced. It is a useful method in post-operative diagnosis. Conclusions. Diaphragmatic paralysis after supraclavicular brachial plexus blockade is a complication mainly observed in patients with previous pulmonary problems. Therefore, it must be strictly monitored.

Introdução. A anestesia regional é uma técnica importante, inovadora e popular para o manejo anestésico e analgésico. No bloqueio supraclavicular do plexo braquial há uma incidência de 50-60% de paralisia diafragmática. A apresentação clínica é variável de acordo com fatores externos e internos do paciente. Existem múltiplas técnicas radiológicas no diagnóstico, sendo a ultrassonografia muito útil devido ao seu fácil acesso. O objetivo é determinar a incidência de paralisia diafragmática secundária ao bloqueio supraclavicular do plexo braquial guiado por ultrassom em uma instituição de quarto nível. Metodologia. Estudo analítico, longitudinal, prospectivo; 110 pacientes foram selecionados. Critérios de inclusão: pacientes maiores de 18 anos submetidos à cirurgia de membro superior com bloqueio supraclavicular do plexo braquial. Critérios de exclusão: pacientes ASA (American Anesthesiology Society) 4 e 5, gestantes, IMC>35 kg/m2 pacientes com história neuromuscular, doença pulmonar restritiva ou obstrutiva, paralisia do nervo frênico ou disfunção diafragmática. Foi realizada uma análise por meio de testes estatísticos, descrevendo os diferentes graus de paralisia diafragmática. Resultados. Nos pacientes que atenderam aos critérios de inclusão, a incidência de paralisia diafragmática foi de 65% (37% paralisia total e 28% parcial), 1.81% apresentavam sintomas respiratórios sem alterações hemodinâmicas. Discussão. O bloqueio do plexo braquial supraclavicular é uma técnica relacionada à paralisia diafragmática, a ultrassonografia tem reduzido a incidência dessa complicação e é um método útil no diagnóstico pós-operatório. Conclusões. A paralisia diafragmática após bloqueio do plexo braquial supraclavicular é uma complicação observada principalmente em pacientes com envolvimento pulmonar prévio, pelo que é importante vigilância rigorosa.

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Resumen Objetivo: Establecer la prevalencia de mujeres mayores de 50 años con mamas densas estudiadas por mamografía en el área de Bucaramanga. Métodos: Se realizó un estudio descriptivo retrospectivo durante el periodo comprendido entre enero de 2014 y agosto de 2015, en el que se revisaron 10.110 mamografías de pacientes mayores de 50 años. Posteriormente, se hizo una revisión de la literatura en las principales bases de datos. Resultados: De las 10.110 mamografías realizadas, 4.448 fueron encontradas como positivas para mama densa. De estas, el 39,69% correspondió a tejido mamario heterogéneamente denso y el 4,29%, a tejido mamario extremadamente denso, para un total de 43,9% de los casos estudiados. Conclusión: La densidad mamaria es un factor de riesgo independiente de cáncer de mama, considerado de mediana importancia frente a otros factores. A medida que incrementa la densidad mamaria, se genera la superposición del tejido mamario radio-opaco que puede ocultar y llegar a retardar el diagnóstico de un cáncer subyacente. Dada la alta prevalencia de tejido mamario denso encontrado en la población estudiada, se sugiere complementar el tamizaje con otros métodos de imágenes.

Abstract Objective: To establish the prevalence of dense breast tissue in a group of women aged over 50 years, who were studied with mammography in the city of Bucaramanga (Colombia). Methods: A retrospective descriptive study was conducted from January 2014 to August 2015; 10.110 mammograms of patients aged over 50 years were reviewed. Subsequently, a review of the literature in the main databases was made. Results: From 10.110 mammograms that were performed, 4.448 were found to be positive for dense breast tissue. 39,69% had heterogeneously dense breast tissue, and 4,29% extremely dense breast tissue, for a total result of 43,9% patients with positive dense breast tissue. Conclusion: Breast density is an independent risk factor for breast cancer, being of medium importance compared with other factors. As the breast density increases, the overlap of the radiopaque breast tissue that can hide and delay the diagnosis of an underlying cancer is generated. The high prevalence of dense breast tissue that we found in this population suggests the need of complementing screening with other imaging methods.

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RESUMEN Introducción: La somnolencia diurna excesiva (SDE) puede llegar a interferir en el desempeño académico y profesional, debido a que las personas afectadas tienden a quedarse dormidas en situaciones que exigen un alto nivel de atención. Los estudiantes de Medicina representan una población en riesgo de SDE, dada la exigencia académica de numerosas horas de estudio, debido al gran número de créditos por asignatura contenidos en el plan de estudios del programa académico, las prácticas docentes asistenciales y los turnos nocturnos, que pueden generar privación o déficit acumulado del sueño. Por esta razón, es importante estimar la prevalencia de SDE y los factores asociados en estudiantes de Medicina de una institución de educación superior (IES) de Bucaramanga, con el objetivo de implementar estrategias de prevención primaria que disminuyan la presentación de este problema y mejoren la calidad de vida y el desempeño académico de los estudiantes. Material y métodos: Estudio transversal analítico observacional, con una muestra poblacional de 458 estudiantes de Medicina matriculados en el segundo semestre de 2015 en la Universidad Autónoma de Bucaramanga (UNAB), quienes respondieron a 4 cuestionarios: variables sociodemográficas, escala de somnolencia de Epworth, índice de calidad del sueño de Pittsburg (ICSP) e índice de higiene del sueño (IHS). Se realizó el análisis bivariable y multivariable en busca de asociación con SDE. Resultados: Los estudiantes tenían una media de edad de 20,3 arios; de los 458 encuestados, el 62,88% eran mujeres. Se estableció que el 80,75% de los participantes tenían SDE y el 80,55%, una percepción negativa de la calidad del sueño (OR = 1,91;IC95%, 1,11-3,29; p = 0,019). En el análisis multivariable, se encontró que el hecho de estar cursando ciencias clínicas disminuye el riesgo de SDE respecto a quienes estaban cursando el ciclo básico. Además, se observó que una puntuación > 15 en el IHS aumenta de manera significativa el riesgo de padecer SDE. Conclusiones: Aunque es frecuente encontrar SDE en los estudiantes de Medicina, solo un pequeño porcentaje de ellos sufren la forma severa de este trastorno del sueño. Estar cursando asignaturas del ciclo básico se asocia con mayor riesgo de SDE, por lo cual es importante que los comités curriculares de las IES evalúen regularmente la cantidad de horas de trabajo supervisado e independiente que realizan los estudiantes de Medicina. Finalmente, es importante emprender campañas orientadas a mejorar la percepción de riesgo sobre el uso de bebidas energizantes de los estudiantes universitarios y realizar, desde el ingreso al programa académico, recomendaciones sobre los hábitos de higiene del sueño.

ABSTRACT Introduction: Excessive daytime sleepiness (EDS) can interfere with academic and professional performance, as affected individuals tend to fall asleep in situations that demand a high level of alertness. Medical students are often a population at risk of suffering from EDS due to the demanding number of study hours, the significant number of credits per subject in the academic curriculum, practical teaching sessions and hospital night shifts, which can lead to sleep deprivation or sleep debt. It is for these reasons that it is important to estimate the prevalence of EDS and its associated factors in medical students of a Higher Education Institution (HEI) in Bucaramanga, in order to implement early prevention strategies to reduce the occurrence of this problem and to improve the students' quality of life and academic performance. Material and methods: An observational, cross-sectional analytical study with a population sample of 458 medical students enrolled in the second semester of 2015 at the Universidad Autonomade Bucaramanga (UNAB), who completed four questionnaires: Sociodemographic Variables, Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index and Sleep Hygiene Index (SHI). A bivariate and multivariate analysis was performed to identify any correlations with EDS. Results: Mean student age was 20.3 years and 62.88% of the 458 respondents were women. We were able to establish that 80.75% of participants suffered from EDS and 80.55% had a negative perception of their sleep quality (OR=1.91; 95% CI, 1.11-3.29; p =0.019). In the multivariate analysis, it was found that the risk of EDS is lower in the clinical sciences than in the basic cycle. Furthermore, it was noted that a score higher than 15 in the Sleep Hygiene Index significantly increases the risk of suffering from EDS. Conclusions: Although EDS is very common in medical students, only a small percentage present the most severe form of this sleep disorder. Being enrolled in basic cycle subjects is associated with a higher risk of suffering EDS, so it is important for the curriculum committees of higher education institutions to regularly evaluate the number of hours of supervised and independent work performed by medical students. Finally, it is important to implement campaigns aimed at improving university students' perception of the risk of taking energy drinks and to establish sleep hygiene recommendations from the start of the academic programme.

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INTRODUCTION: Excessive daytime sleepiness (EDS) can interfere with academic and professional performance, as affected individuals tend to fall asleep in situations that demand a high level of alertness. Medical students are often a population at risk of suffering from EDS due to the demanding number of study hours, the significant number of credits per subject in the academic curriculum, practical teaching sessions and hospital night shifts, which can lead to sleep deprivation or sleep debt. It is for these reasons that it is important to estimate the prevalence of EDS and its associated factors in medical students of a Higher Education Institution (HEI) in Bucaramanga, in order to implement early prevention strategies to reduce the occurrence of this problem and to improve the students' quality of life and academic performance. MATERIAL AND METHODS: An observational, cross-sectional analytical study with a population sample of 458 medical students enrolled in the second semester of 2015 at the Universidad Autonoma de Bucaramanga (UNAB), who completed four questionnaires: Sociodemographic Variables, Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index and Sleep Hygiene Index (SHI). A bivariate and multivariate analysis was performed to identify any correlations with EDS. RESULTS: Mean student age was 20.3 years and 62.88% of the 458 respondents were women. We were able to establish that 80.75% of participants suffered from EDS and 80.55% had a negative perception of their sleep quality (OR=1.91; 95% CI, 1.11-3.29; p =0.019]. In the multivariate analysis, it was found that the risk of EDS is lower in the clinical sciences than in the basic cycle. Furthermore, it was noted that a score higher than 15 in the Sleep Hygiene Index significantly increases the risk of suffering from EDS. CONCLUSIONS: Although EDS is very common in medical students, only a small percentage present the most severe form of this sleep disorder. Being enrolled in basic cycle subjects is associated with a higher risk of suffering EDS, so it is important for the curriculum committees of higher education institutions to regularly evaluate the number of hours of supervised and independent work performed by medical students. Finally, it is important to implement campaigns aimed at improving university students' perception of the risk of taking energy drinks and to establish sleep hygiene recommendations from the start of the academic programme.

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