Perceptions of COVID-19 patients in the use of bioethical principles and the physician-patient relationship: a qualitative approach.

BACKGROUND: The COVID-19 pandemic has influenced the approach to the health-disease system, raising the question about the principles of bioethics present in physician-patient relations. The principles while widely accepted may not be sufficient for a comprehensive ethical analysis. Therefore, the aim of this study was to explore the perception of these principles and the physician-patient relationship during a hospital stay through a qualitative approach. METHOD: Sixteen semi-structured interviews took place to know the patients' perception during their 2020 hospitalization for COVID-19. The data was analyzed through the constant comparison method, creating categories and comparing them. In the end, seven categories were established and were grouped in three: bioethical principles (dignity, charity, vulnerability, autonomy), doctor-patient relationship (participant commitment, informed consent, health staff-patient relationship) and the experience of the disease (illness, the role of the family). RESULTS: The research found that most patients described a positive experience, with the feeling of having been well cared for with no sense of discrimination or injustice done. The majority also reported that their autonomy was respected in the treatment decisions. The evaluation of these attitudes is an area of opportunity, especially when the patients' vulnerability is at risk. CONCLUSIONS: The ethics of virtue offers a better reflection of how human beings manifest themselves by emphasizing the development of virtuous character and behaviors that allow them to realize their values in life. Authorized by the Research Ethics Committee with registration: DI/18/105-B/3/308.

Risk factors contributing to infection with SARS-CoV-2 are modulated by sex.

Throughout the early stages of the COVID-19 pandemic in Mexico (August-December 2020), we closely followed a cohort of n = 100 healthcare workers. These workers were initially seronegative for Immunoglobulin G (IgG) antibodies against SARS-CoV-2, the virus that causes COVID-19, and maintained close contact with patients afflicted by the disease. We explored the database of demographic, physiological and laboratory parameters of the cohort recorded at baseline to identify potential risk factors for infection with SARS-CoV-2 at a follow-up evaluation six months later. Given that susceptibility to infection may be a systemic rather than a local property, we hypothesized that a multivariate statistical analysis, such as MANOVA, may be an appropriate statistical approach. Our results indicate that susceptibility to infection with SARS-CoV-2 is modulated by sex. For men, different physiological states appear to exist that predispose to or protect against infection, whereas for women, we did not find evidence for divergent physiological states. Intriguingly, male participants who remained uninfected throughout the six-month observation period, had values for mean arterial pressure and waist-to-hip ratio that exceeded the normative reference range. We hypothesize that certain risk factors that worsen the outcome of COVID-19 disease, such as being overweight or having high blood pressure, may instead offer some protection against infection with SARS-CoV-2.

Effect of Insulin Resistance on Abdominal Obesity, Liver Fat Infiltration, and Body Mass Index in Youngsters.

AIM: Evaluate insulin resistance (IR) as a mediator of the effect of body fat distribution on liver fat infiltration and stiffness (LSt) in young adults using structural equation modeling (SEM). METHODS: We invited 500 first year students from two universities and evaluated their family history to determine the risk for cardiometabolic disease. Of these, 174 students (age 19 ± 1 years) were assessed for total body fat percentage (BF%), LSt, fat infiltration (Coefficient attenuated parameter CAP), and serum biochemical analysis. We performed a mediation analysis using two different structural equation models to determine the relationship between BMI, BF%, abdominal obesity (AO), IR, LSt, and fat infiltration using standardized ß coefficients. The symbol "->" means "explains/causes". RESULTS: Model#1 supported that mediation analysis and had a better fit than the direct effect. AO->IR (b = 0.62, p = 0.005), AO->CAP (b = 0.63, p <0.001), and CAP->IR (b = 0.23, p = 0.007), with negligible effect of BMI on CAP and IR. Model#2 showed direct effect of BMI on LSt was a better fit than mediation. BMI->LSt (b = 0.17, p = 0.05) but no effect AO->LSt. Interestingly, LSt->IR (b = 0.18, p = 0.001), but bi-directional IR->LSt (b = 0.23, p = 0.001). CONCLUSIONS: AO and BMI in young adults have differential phenotypic effects on liver CAP and LSt. Visceral fat had a direct effect on IR and CAP. Meanwhile, BMI was associated with LSt. Our findings shed light on the complex interplay of factors influencing liver stiffness, particularly in young individuals. Further research is needed to elucidate the precise mechanisms underlying these associations and their implications for liver health.

Opportune warning of COVID-19 in a Mexican health care worker cohort: Discrete beta distribution entropy of smartwatch physiological records.

We present a statistical study of heart rate, step cadence, and sleep stage registers of health care workers in the Hospital General de México "Dr. Eduardo Liceaga" (HGM), monitored continuously and non-invasively during the COVID-19 contingency from May to October 2020, using the Fitbit Charge 3® Smartwatch device. The HGM-COVID cohort consisted of 115 participants assigned to areas of COVID-19 exposure. We introduce a novel biomarker for an opportune signal for the likelihood of SARS-CoV-2 infection based on the Shannon Entropy of the Discrete Generalized Beta Distribution fit of rank ordered smartwatch registers. Our statistical test indicated infection for 94% of patients confirmed by positive polymer chain reaction (PCR+) test, 47% before the test, and 47% in coincidence. These results required innovative data preprocessing for the definition of a new biomarker index. The statistical method parameters are data-driven, confidence estimates were calibrated based on sensitivity tests using appropriately derived surrogate data as a benchmark. Our surrogate tests can also provide a benchmark for comparing results from other anomaly detection methods (ADMs). Biomarker comparison of the negative Immunoglobulin G Antibody (IgG-) subgroup with the PCR+ subgroup showed a statistically significant difference (p < 0.01, effect size = 1.44). The distribution of the uninfected population had a lower median and less dispersion than the PCR+ population. A retrospective study of our results confirmed that the biomarker index provides an early warning of the likelihood of COVID-19, even several days before the onset of symptoms or the PCR+ test request. The method can be calibrated for the analysis of different SARS-CoV-2 strains, the effect of vaccination, and previous infections. Furthermore, our biomarker screening could be implemented to provide general health profiles for other population sectors based on physiological signals from smartwatch wearable devices.

Time intervals to care and health service use experiences of uninsured cancer patients treated under public financing in Mexico City.

BACKGROUND: The present study assesses the time intervals from symptom discovery to treatment start and describes the health service use experiences of uninsured patients with cancer of the breast, cervix uteri, testicle, and prostate before their arrival to the cancer hospital. METHODS: This cross-sectional study included 1468 patients who were diagnosed between June 2016 and May 2017 and received treatment for the selected cancers in two of the largest public cancer hospitals in Mexico City, financed through Seguro Popular. Data was collected through a survey administered via face-to-face interviews with patients and a review of their medical files. RESULTS: The median time between detection (symptom discovery or first abnormal screening test) and treatment start was 6.6 months. For all types of cancer, the longest interval was the diagnostic interval -between the first use of healthcare services and the confirmation of cancer. Less than 20% cancer patients were diagnosed in the earliest stages that are associated with the best chances of long-term survival. The participants described a high use of private services for their first consultation, the use of several different types of health services and multiple consultations before arrival to the cancer centers, and 35% perceived being misdiagnosed by the first doctor they consulted. CONCLUSIONS: Most cancer patients treated in the two largest public institutions available for the uninsured faced long delays to get diagnosed and started treatment at advanced stages. Strengthening quality and access for effective early cancer diagnosis and treatment is key to improve patient outcomes in low and middle-income settings.

In Vitro Exposure of Primary Human T Cells and Monocytes to Polyclonal Stimuli Reveals a Basal Susceptibility to Display an Impaired Cellular Immune Response and Develop Severe COVID-19.

The contribution of the cellular immune response to the severity of coronavirus disease 2019 (COVID-19) is still uncertain because most evidence comes from patients receiving multiple drugs able to change immune function. Herein, we conducted a prospective cohort study and obtained blood samples from 128 unvaccinated healthy volunteers to examine the in vitro response pattern of CD4+ and CD8+ T cells and monocyte subsets to polyclonal stimuli, including anti-CD3, anti-CD28, poly I:C, severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) recombinant spike S1 protein, and lipopolysaccharide. Then, we started a six-month follow-up and registered 12 participants who got SARS-CoV-2 infection, from whom we retrospectively analyzed the basal immune response pattern of T cells and monocytes. Of the 12 participants infected, six participants developed mild COVID-19 with self-limiting symptoms such as fever, headache, and anosmia. Conversely, six other participants developed severe COVID-19 with pneumonia, respiratory distress, and hypoxia. Two severe COVID-19 cases required invasive mechanical ventilation. There were no differences between mild and severe cases for demographic, clinical, and biochemical baseline characteristics. In response to polyclonal stimuli, basal production of interleukin-2 (IL-2) and interferon (IFN-) gamma significantly decreased, and the programmed cell death protein 1 (PD-1) increased in CD4+ and CD8+ T cells from participants who posteriorly developed severe COVID-19 compared to mild cases. Likewise, CD14++CD16- classical and CD14+CD16+ non-classical monocytes lost their ability to produce IFN-alpha in response to polyclonal stimuli in participants who developed severe COVID-19 compared to mild cases. Of note, neither the total immunoglobulin G serum titers against the virus nor their neutralizing ability differed between mild and severe cases after a month of clinical recovery. In conclusion, using in vitro polyclonal stimuli, we found a basal immune response pattern associated with a predisposition to developing severe COVID-19, where high PD-1 expression and low IL-2 and IFN-gamma production in CD4+ and CD8+ T cells, and poor IFN-alpha expression in classical and non-classical monocytes are linked to disease worsening. Since antibody titers did not differ between mild and severe cases, these findings suggest cellular immunity may play a more crucial role than humoral immunity in preventing COVID-19 progression.

High Incidence Rate of SARS-CoV-2 Infection in Health Care Workers at a Dedicated COVID-19 Hospital: Experiences of the Pandemic from a Large Mexican Hospital.

Health care workers (HCW) are at high risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The incidence of SARS-CoV-2 infection in HCW has been examined in cross-sectional studies by quantitative polymerase chain reaction (qPCR) tests, which may lead to underestimating exact incidence rates. We thus investigated the incidence of SARS-CoV-2 infection in a group of HCW at a dedicated coronavirus disease 2019 (COVID-19) hospital in a six-month follow-up period. We conducted a prospective cohort study on 109 participants of both sexes working in areas of high, moderate, and low SARS-CoV-2 exposure. qPCR tests in nasopharyngeal swabs and anti-SARS-CoV-2 IgG serum antibodies were assessed at the beginning and six months later. Demographic, clinical, and laboratory parameters were analyzed according to IgG seropositivity by paired Student's T-test or the chi-square test. The incidence rate of SARS-CoV-2 infection was considerably high in our cohort of HCW (58%), among whom 67% were asymptomatic carriers. No baseline risk factors contributed to the infection rate, including the workplace. It is still necessary to increase hospital safety procedures to prevent virus transmissibility from HCW to relatives and non-COVID-19 patients during the upcoming waves of contagion.

Construction and Validation of a Questionnaire to Assess the Physician-Patient Relationship and its Association with Bioethical Principles / Construcción y validación de un cuestionario para evaluar la relación médico-paciente y su asociación con los principios bioéticos / Construção e validação de um questionário para avaliar a relação médico-paciente e sua associação com os princípios bioéticos

Abstract Physician-patient relationship (PPR) is a professional-interpersonal relationship that serves as the basis for health management. We aimed to develop an instrument for patients to assess the medical attention received in the outpatient clinic. A 21 question instrument was administered to evaluate its reliability and consistency. The intraclass correlation coefficient was 0.81 (p < 0.05); to fulfill the bioethical principles, the intraclass correlation coefficient was 0.740 (p < 0.05), allowing us to get familiar with the perception of patients who attended the Nephrology Service. The survey showed autonomy as the most reported principle (69 %), followed by dignity (67 %) and justice (60 %). Courtesy, punctuality, and respect make the disease and its treatment more bearable, in addition to promoting the ethics of third parties.

Resumen La relación médico-paciente (RMP) es una relación profesional-interpersonal base para la gestión de la salud. Nuestro objetivo fue desarrollar un instrumento que permitiera evaluar la presencia de los principios bioéticos en la atención médica recibida en la consulta externa de una institución hospitalaria. El instrumento quedó constituido por 21 reactivos para evaluar su confiabilidad y consistencia. El coeficiente de correlación intraclase fue de 0,81 (p < 0,05); para el cumplimiento de los principios bioéticos, fue de 0,740 (p < 0,05). El cuestionario mostró que la autonomía fue el principio más reportado (69 %), después la dignidad (67 %) y justicia (60 %). La presencia de los principios de la bioética ampliados hace más llevadera la enfermedad.

Resumo A relação médico-paciente é uma relação profissional interpessoal, base para a gestão da saúde. Nosso objetivo foi desenvolver um instrumento que permitisse avaliar a presença dos princípios bioéticos na atenção médica recebida na consulta de uma instituição hospitalar. O instrumento foi constituído de 21 reativos para avaliar sua confiabilidade e consistência. O coeficiente de correlação intraclasse foi de 0,81 (p < 0,05); para o cumprimento dos princípios bioéticos, foi de 0,740 (p < 0,05). O questionário mostrou que a autonomia foi o princípio mais relatado (69%), depois da dignidade (67%) e da justiça (60%). A presença dos princípios da bioética ampliados torna a doença mais suportável.

Comparison of Carotid Intima-Media Thickness in Children and Adults With and Without Obesity: A Hysteresis Model.

OBJECTIVE: To describe a third-degree polynomial function (hysteresis) of the effect size of age, obesity, and insulin sensitivity over the carotid intima-media thickness (c-IMT), in the pediatric and adult groups. METHODS: A quasi-experimental study with fixed factor analysis of age (children aged 8-12 years, n = 73; adults aged 21-45 years, n = 82) and obesity (yes, n = 76; no, n = 79) was conducted to analyze the effect on the c-IMT and Matsuda insulin sensitivity index values. This quasi-experimental design was analyzed with robust regression modeling. RESULTS: The additive effect of obesity, independent of age, was evident in the case of the c-IMT values. There was no interaction effect, but a significant difference between participants with normal weight and those with obesity was found (P < .0001). The difference between adults and children was also significant, but the effect size was smaller. A model was created based on age, Tanner stage, and obesity using the c-IMT and Matsuda insulin sensitivity index values. A linear function fit as R2, and the cubic function estimated parameters like a polynomial model. CONCLUSION: This practical study design showed that children with obesity displayed the same levels of carotid intima-media abnormalities as adults with obesity. The polynomial shape of the model suggests potentially poor outcomes that resemble the hysteresis process and may predict chronic cardiometabolic events during early adulthood.

Young adult binge drinkers have immunophenotypical disarrangements in peripheral natural killer cells.

Alcohol consumption is an issue of worldwide relevance and a problem of national scale in Mexico. The consumption pattern of large amounts of alcohol on the weekends is rapidly increasing in young adults between 18 and 29 years. Despite various studies that have focused on the noxious effect of alcohol in immunity, the changes in the immunoprofiles of peripheral blood cells have not been completely described. Natural killer cells (NKCs) are lymphoid-origin cells of the immune system that are responsible for defense against tumors, among other functions. In homeostatic conditions, they are found to be in a state of "dynamic balance" between activation and inhibition stimuli, which, if broken, may lead to immunosuppression or activation of cytotoxic mechanisms. In this study, we evaluated the immunoprofile of peripheral NKCs of 54 young adults, 29 of whom were binge drinkers and 25 of whom were low risk (LR), as classified by validated tools. Drinking habits were assessed. Blood samples were collected to perform hematic biometry and liver enzyme tests. Peripheral NKCs were identified by FACS, and stained for CCR2, CCR4, CCR5, CXCR4, CD69, CD127, CD137, TLR4, and Granzyme B. The data were analyzed using the t test and Mann-Whitney's U test for contrasts, and the effect size was obtained in order to evaluate the impact of each immunoprofile. The binge group showed increased expression of CCR5 and PD-1 in NKCs, respective to the LR group, and decreased expression of TLR4, along with fewer CCR4+ cells. Moreover, the increase found in CCR5 and PD-1 expression was correlated with the number of drinks in the last drinking session. Our findings show that young binge drinkers have different immunoprofiles that could suggest an early status of immunosuppression and trafficking of NKCs to the liver, which could be related to the onset of early liver damage, early in a subject's lifespan.

Young adult binge drinkers have immunophenotypic changes in peripheral polymorphonuclear cells and monocytes.

BACKGROUND: High alcohol intake on weekends (binge drinking) is more frequent in young adults, who could undergo early liver damage. Alcohol-induced liver damage is characterized by polymorphonuclear cell (PMN) infiltration, which can be represented in the peripheral blood by altered trafficking and activation profiles. OBJECTIVE: To evaluate the PMN trafficking and activation immunophenotypic profiles in people with a binge drinking pattern. METHODS: People with binge drinking (n = 18, 8 females) or at low risk (n = 16, 13 females) based on their AUDIT and HEPCA scores were studied. Hematic biometry and liver enzyme tests were conducted. Peripheral blood leukocytes were stained for CCR5, CCR4, and CXCR4 (trafficking) and CD69 and CD127 (activation). PMNs and monocytes were analyzed by FACS. The data were analyzed using the T-test and Mann-Whitney's U-test for contrasts and principal component and Fuzzy C means analyses for clustering, with p < 0.05 considered significant. RESULTS: Compared to the low-risk group, the binge group showed higher CCR5 expression on PMNs, decreases in the CD69 percentage and positive PMNs per microliter, and decreased CXCR4 expression on monocytes. Six immunophenotypical clusters were identified, all of which were distributed following the CCR5 and CXCR4 main vectors. CONCLUSION: Young adult binge drinkers have differential PMN trafficking and activation immunophenotypes, which could be related to the initial onset of alcoholic liver disease and a systemic inflammatory state in response to their alcohol consumption pattern. These findings could lead to the future development of an early diagnostic tool.

Alterations in Activation, Cytotoxic Capacity and Trafficking Profile of Peripheral CD8 T Cells in Young Adult Binge Drinkers.

BACKGROUND: Excess of alcohol consumption is a public health problem and has documented effects on the immune system of humans and animals. Animal and in vitro studies suggest that alcohol abuse changes CD8 T cell (CD8) characteristics, however it remains unknown if the CD8 profile of binge drinkers is different in terms of activation, trafficking and cytotoxic capacity. AIM: To analyze the peripheral CD8 cytotoxic capacity, activation and trafficking phenotypic profile of Mexican young adults with regard to alcohol consumption pattern. METHODS: 55 Mexican young adults were stratified as Light (20), Intermediate (18) or Binge drinkers (17) according to their reported alcohol consumption pattern. Blood samples were obtained and hematic biometry and liver enzyme analysis were performed. Peripheral CD8 profile was established by expression of Granzyme B (GB), CD137, CD127, CD69, TLR4, PD1, CCR2, CCR4, CCR5 and CXCR4 by FACS. Data was analyzed by ANOVA, posthoc DMS and Tamhane, and principal component analysis (PCA) with varimax rotation, p<0.05. RESULTS: The Binge drinking group showed increased γGT together with increased expression of CD69 and reduced expression of TLR4, PD1, CCR2 and CXCR4 in peripheral CD8 cells. Other parameters were also specific to Binge drinkers. PCA established 3 factors associated with alcohol consumption: "Early Activation" represented by CD69 and TLR4 expression in the CD8 population; "Effector Activation" by CD69 expression in CD8 CD127(+)CD137(+) and CD8 CD25(+) CD137(+); and Trafficking by CXCR4 expression on total CD8 and CD8 GB(+)CXCR4(+), and CCR2 expression on total CD8. Binge drinking pattern showed low expression of Early Activation and Trafficking factors while Light drinking pattern exhibited high expression of Effector Activation factor. CONCLUSIONS: Alcohol consumption affects the immune phenotype of CD8 cells since binge drinking pattern was found to be associated with high CD69 and low TLR4, CXCR4 and CCR2 expression, which suggest recent activation, decreased sensitivity to LPS and lower migration capacity in response to chemokines SDF-1 and MCP-1. These results indicate that a binge-drinking pattern of alcohol consumption may induce an altered immune profile that could be related with liver damage and the increased susceptibility to infection reported to this behavior.

[Interpersonal relationships: perception of the communication, treatment and adverse experiences encountered by users of medical units that belong to the Coordinating Commission of the National Institutes of Health and High Specialty Hospitals (CCINSHAE)]. / Las relaciones interpersonales: percepción de la comunicación, trato y experiencias adversas en los usuarios de las unidades médicas pertenecientes a la Comisión Coordinadora de Institutos Nacionales de Salud y Hospitales de Alta Especialidad (CCINSHAE).

INTRODUCTION: User's perception with regard to the attention they received in healthcare units is increasingly being taken into account by the health service providers in order to improve the quality of their service. AIM: Describe how the users perceive the health services provided by the CCINSHAE with regard to the communication with the physicians, the attention of the staff and the adverse personal and institutional experiences and to explore their relation with user's demographic characteristics, health condition, physical limitations to carry out daily activities and service area. METHODS: A questionnaire was designed to collect information about the user and his/her opinion with regard to the healthcare units, the communication with the physicians, the attention of the staff and the adverse personal and institutional experiences. The data were analyzed with STATA using sample weights. RESULTS: A total of 2,176 individuals were interviewed after they had received attention and represent a population of 1,457,964 users, over 6 months, of the CCINSAHE. We then calculated four binary variables that reflect the perception of the users. These four variables were significantly associated with the type of health unit where the user received attention, schooling, limitations to carry out daily activities, facilities provided to the relatives, family income, the use of alternative medicine, and the area of attention. DISCUSSION: A fundamental aspect of the service provided by the healthcare institutions is the communication between the physicians and the users. We found that the perception of the users with regard to the communication with the physician, the attention of the staff, and the adverse personal and institutional experiences was associated with the type of healthcare unit. The federal reference hospitals produced the most unfavorable perception while the regional hospitals produced the most favorable impression. This study enables the decision-making personnel to determine what needs to be modified in order to improve the service provided by the health units.

Congenital heart disease and its association with other congenital malformations found at autopsy.

The objective was to determine if a study of other malformations found autopsy in patients with congenital heart disease would contribute to an understanding of the mechanisms involved in the formation of these anomalies. In a large general hospital autopsies in children with congenital heart disease were selected, and the different cardiopathies were divided into 3 groups: those with isolated heart lesions, those with single gene mutants, as well as chromosome malformations, and those with idiopathic malformations not associated with a genetic syndrome. Because the cardiopathies most often associated with genetic syndromes were the septal defects in general (p = .001), it was presumed that these are influenced to a considerable extent by genetic factors. The association of left heart hypoplasia and coarctation of the aorta with multiple idiopathic malformations, particularly in the lower half of the body (p = .002), suggests that the latter may be due to vascular disruptions, because of the interruption of the flow of oxygenated blood in the embryo-fetus produced by these heart defects. Cranial defects were not associated with left heart obstruction, and are therefore unlikely to be produced by vascular disruption.

Correlación clínica entre portadores de tatuajes y trastornos de la personalidad en sujetos aspirantes a ingresar a cuerpos de seguridad pública / Clinical correlation between tattod individuals and personality disturbances seen as applicants to the staffs of public security

En la práctica de la Cirugía Plástica y Reconstructiva, un motivo frecuente de consulta lo constituyen los pacientes que presentan tatuajes en diversas partes del cuerpo, los cuales solicitan su resección, con objeto de ingresar a organismos de seguridad pública o privada. Existe la creencia que dichos sujetos a menudo presentan patrones de conducta de tipo antisocial. Para investigar esto, se realizó un estudio de tipo prospectivo, observacional y longitudinal, de 60 pacientes durante un periodo de 12 meses. Las edades de los sujetos oscilaron entre 15 y 45 años. El procedimiento incluyó una evaluación psiquiátrica, aunada a la evaluación psicológica mediante una entrevista y la aplicación de las siguientes pruebas: MMPI, MACHOVER, HTP, BENDER. Posteriormente, y con base en un análisis de los resultados obtenidos y de acuerdo a los parámetros estipulados en el DSM-IV, se elaboró un diagnóstico que permitió identificar un "perfil psiquiátrico común". En el 20 por ciento de la muestra estudiada, el perfil estuvo caracterizado por la presencia de rasgos de personalidad antisocial, nivel educativo bajo y nivel socioeconómico precario. Se concluye que estos individuos no son los candidatos ideales para asumir cargos como servidores públicos en cuerpos de seguridad

Ileítis crónica por antiinflamatorios no esteroideos en un paciente con espondilitis anquilosante / Chronic ileitis by non-steroidal antiinflammatory drugs in a patient with ankylosing spondilitis

Estudios recientes han mostrado que hasta el 70 por ciento de los pacientes que ingieren por largo tiempo antiinflamatorios no esteroideos desarrollan ileítis crónica y, algunos de ellos, complicaciones graves como son: síndrome de mala-absorción, perforación, hemorragia y oclusión intestinal. Informamos el caso de un hombre de 50 años con espondilitis anquilosante, tratado con antiinflamatorios no esteroideos (indometacina, fenilbutazona y naproxeno) desde los 13 años, que presento un cuadro de oclusión intestinal con síndrome abdominal agudo. Fue tratado quirúrgicamente y se encontraron las características macroscópicas y microscópicas que se presentan en la ileítis crónica por antiinflamatorios no esteroideos

Pancreatitis crónica, un problema oculto. Estudio clínico patológico de 443 casos / Chronic pancreatitis, an occult problem. A clinical pathological study of 433 cases

Objetivo: establecer la frecuencia de la pancreatitis crónica en pacientes del Hospital General de México, las enfermedades asociadas, complicaciones y frecuencia de diagnóstico clínico correcto. Antecedentes: la pancreatitis crónica tiene signos y síntomas inespecíficos, por lo que rara vez es diagnosticada en vida. Se asocia con alcoholismo y litiasis biliar, dos padecimientos endémicos en nuestro país. Método: se trató de un estudio clínico-patológico, retrospectivo en 20 años (1970-1990) de 15,937 autopsias. Resultados: se encontraron 443 casos de pancreatitis crónica (2.7 por ciento del total de autopsias). El 60 por ciento de los casos ocurrió en hombres, El promedio de edad fue de 50 años. Los casos infantiles fueron excepcionales. Las enfermedades asociadas más frecuentes fueron alcoholismo crónico (66.5 por ciento), cirrosis hepática alcohólica (29.5 por ciento), y litiasis biliar (14.9 por ciento). Las complicaciones más comunes fueron diabetes mellitus (20.7 por ciento) y pseudoquistes pancreáticos (4.6 por ciento). El diagnóstico clínico correcto se hizo tan sólo en 7.4 por ciento Conclusiones: éste es la serie nacional más grande de casos publicados y comprobados por autopsia de pancreatitis crónica. La pancreatitis crónica es un problema clínico oculto, casi exclusivo de los autos, y por lo regular no diagnosticado

Isquemia y reperfusión repetidas en el músculo serrato de la rata / Repeated ischemia-reperfusion in the serratus muscle of the rat

Los límites absolutos del tiempo de isquemia tolerada por un músculo no son universalmente aceptados. El presente estudio evalúa viabilidad de un músculo sometido a periodos repetidos de isquemia y reperfusión, por medio de los efectos que tienen dicho fenómeno a nivel histopatológico. Se usó el músculo serrato de 70 ratas de la cepa Wistar. Estos animales fueron distribuidos en siete grupos iguales que se sometieron a diferentes periodos de isquemia. Los periodos variaron de una a tres horas y de uno a tres periodos. Entre cada tiempo de isquemia se permitieron cinco minutos de reperfusión. El estudio histopatológico consistió en clasificar la lesión de acuerdo al grado de edemas, inflamación, cariopicnosis y rabdomiólisis. Los resultados mostraron que el grupo 5, con dos periodos de tres horas más otro de una hora, presentó el mayor grado de edema. La inflamación fue más grave en el grupo 4, con dos periodos de isquemia de tres hora. La cariopicnosis fue mayor en el grupo 3, donde se aplicaron dos periodos de isquemia de tres y dos horas y en el grupo 7 con tres periodos de isquemia de tres horas cada uno. La rabdomiólisis se presentó en mayor grado en el grupo 7. Sometidos los resultados a un análisis estadístico de varianza múltiple de Krusskal-Wallis se encontró que todos los grupos eran estadísticamente diferentes, con una p < 0.05. Pero con los parámetros estudiados no se confirmó nuestra hipótesis, de que a mayor periodo de isquemia mayor daño. Posiblemente las pruebas escogidas para el estudio no son ideales

Tumor rabdoide cerebral primario: informe de un caso y revisión de la literatura / Rhabdoid tumor originating in the brain. Report of a case and review of the literature

Se presenta el caso de un niño de 12 años con un tumor rabdoide primario del encéfalo, intra y extra-axial, con evolución de seis meses. El tumor rodeaba e infiltraba nervios ópticos, quiasma, circunvoluciones rectas y orbitarias, e hipotálamo. Se hizo resección parcial de la neoplasia y en el posoperatorio hubo manifestaciones graves de disfunción hipotalámica. En la autopsia se encontró diseminación subaracnoidea extensa. Se revisan los conceptos actuales acerca del tumor rabdoide renal, extrarrenal y del sistema nervioso central, con énfasis en la histogénesis y los criterios de diagnóstico