Impacto de la participación del residente y su rol en desenlaces clínicos de los pacientes llevados a colecistectomía en un hospital universitario / Impact of resident participation and their role on clinical outcomes of patients undergoing cholecystectomy at a university hospita

Introducción. La colecistectomía es uno de los procedimientos quirúrgicos más realizados a nivel mundial, por lo que su aprendizaje es cada vez más necesario para los médicos residentes en entrenamiento, pero sin comprometer la seguridad de los pacientes. El objetivo de este estudio fue determinar el impacto de la participación de los médicos residentes en los principales desenlaces clínicos de la colecistectomía. Métodos. Se realizó un estudio prospectivo de cohortes, donde se incluyeron los pacientes llevados a colecistectomía laparoscópica, desde junio de 2019 hasta julio de 2020. Se llevó a cabo el análisis estadístico para describir medidas de frecuencia, tendencia central, dispersión y análisis bivariados para los desenlaces de interés. Resultados. Se incluyeron 482 pacientes a quienes se les practicó colecistectomía, 475 de ellas por vía laparoscópica. El 62,5 % fueron mujeres y el 76,2 % se realizaron de carácter urgente. En el 96 % de los procedimientos se contó con la participación de un residente. En el análisis bivariado no se encontró una diferencia estadísticamente significativa entre la participación del residente y un impacto negativo en los desenlaces clínicos de las variables relevantes. Discusión. No hay evidencia de que la participación de médicos residentes en la colecistectomía laparoscópica se asocie con desenlaces adversos en los pacientes, lo que sugiere estar en relación con una introducción temprana y responsable a este procedimiento por parte de los docentes, permitiendo que la colecistectomía sea un procedimiento seguro

Introduction. Cholecystectomy is one of the most performed surgical procedures worldwide, so its learning is increasingly necessary for resident physicians in training, but without compromising the safety of patients. The objective of this study was to determine the impact of the participation of resident physicians on the main clinical outcomes of cholecystectomy. Methods. A prospective cohort study was performed, which included patients undergoing laparoscopic cholecys-tectomy from June 2019 to July 2020. Statistical analysis was carried out to describe measures of frequency, central tendency, dispersion, and bivariate analysis for outcomes of interest. Results. 482 patients who underwent cholecystectomy were included, 475 of them laparoscopically; 62.5% were women and 76.2% were performed urgently, and 96% of the procedures involved the participation of a resident. In the bivariate analysis, no statistically significant difference was found between resident participation and a negative impact on the clinical outcomes of the relevant variables. Discussion. There is no evidence that the participation of resident physicians in laparoscopic cholecystectomy is associated with adverse outcomes in patients, which suggests being related to an early and responsible introduction to this procedure by teachers, allowing cholecystectomy to be a safe procedure

Levels of MMP-9 in patients with intracranial aneurysm: Relation with risk factors, size and clinical presentation.

BACKGROUND: Intracranial aneurysms are arterial anomalies affecting 2% to 3% of the general population in the world and these ruptures are associated with a high mortality. Some risk factors, such as age, gender, smoking, alcohol, hypertension and familial history are associated with the number of aneurysms and their size. In addition, inflammatory processes within the blood vessels of the brain can activate matrix metalloproteinase-9 (MMP-9), which degrades various components of the extracellular matrix, such as elastin. Thereby, this work has aimed at evaluating the relationship between plasma MMP-9 levels and the risk factors that are associated with intracranial aneurysm, as well as investigating the aneurysm statuses (ruptured and unruptured) and comparing them with the control volunteers. METHODS: Between August 2014 to June 2016, blood samples were collected from 282 patients (204 ruptured and 78 unruptured saccular intracranial aneurysms) and 286 control volunteers. The MMP-9 plasma levels were measured by ELISA. Statistical analyzes were performed with SPSS software when using parametric or nonparametric tests, after the normality tests. RESULTS: Higher levels of MMP-9 were found in the aneurysm groups as a whole and when they were stratified by rupture status, then compared with the control group (p < 0.0001). When stratifying them by diameter, those smaller than 7 mm presented high levels of MMP-9 (p < 0.0001), especially in the ruptured ones. As for risk factors, hypertension and smoking were the most important. However, hypertension was mostly associated with the ruptured aneurysms (p < 0.0001). CONCLUSIONS: High levels of MMP-9 were found in smaller ruptured and unruptured intracranial aneurysms (<7 mm) with strongest statistical associations than other sizes, especially when associated with smoking and hypertension.

Matrix metalloproteinase-2 and metalloproteinase-9 activities are associated with blood-brain barrier dysfunction in an animal model of severe sepsis.

There is no description on the mechanisms associated with blood-brain barrier (BBB) disruption during sepsis development. Thus, we here determined changes in permeability of the BBB in an animal model of severe sepsis and the role of matrix metalloproteinase (MMP)-2 and MMP-9 in the dysfunction of the BBB. Sepsis was induced in Wistar rats by cecal ligation and perforation. BBB permeability was assessed using the Evans blue dye method. The content of MMP-2 and MMP-9 in the cerebral microvessels was determined by western blot. The activity of MMP-2 and MMP-9 was determined using zymography. An inhibitor of MMP-2 and MMP-9 or specific inhibitors of MMP-2 or MMP-9 were administered to define the role of MMPs on BBB permeability, brain inflammatory response, and sepsis-induced cognitive alterations. The increase of BBB permeability is time-related to the increase of MMP-9 and MMP-2 in the microvessels, both in cortex and hippocampus. Using an MMP-2 and MMP-9 inhibitor, or specific MMP-2 or MMP-9 inhibitors, the increase in the permeability of the BBB was reversed. This was associated with lower brain levels of interleukin (IL)-6 and lower oxidative damage. In contrast, only the inhibition of both MMP-9 and MMP-2 was able to improve acute cognitive alterations associated with sepsis. In conclusion, MMP-2 and MMP-9 activation seems to be a major step in BBB dysfunction, but BBB dysfunction seems not to be associated with acute cognitive dysfunction during sepsis development.

Sodium butyrate decreases the activation of NF-κB reducing inflammation and oxidative damage in the kidney of rats subjected to contrast-induced nephropathy.

BACKGROUND: Contrast-induced nephropathy (CIN) is associated with a combination of hypoxic and toxic renal tubular damage, renal endothelial dysfunction and altered intra-renal microcirculation. Recently, sodium butyrate (SB) has been focused on since it possesses anti-inflammatory activities. Thus, based on the lack of information on the effects of SB in acute kidney injury (AKI), we investigated the possible effects of SB after CIN in rats. METHODS: Wistar rats were divided into three groups: (1 sham) control, (2 MI) AKI treated with contrast medium and (3 MI + SB) AKI plus SB. Six days after contrast administration, blood and kidney were removed for the determination of creatinine, interleukin (IL)-6 levels, oxidative damage parameters and histologic analyses. Nuclear factor kappa B (NF-κB), pIκBα and vasodilator-stimulated phosphoprotein (VASP) protein content were determined by immunoblotting. RESULTS: After 6 days, the levels of creatinine increased significantly in the MI group, and this was attenuated using SB. SB treatment was associated with a decrease on the levels of lipid peroxidation, but not the protein oxidation, and IL-6 levels, as well as tubular damage. These effects are probably mediated, in part, by a decrease on the activation of NF-κB in the kidney, but not alteration in pVASP content. CONCLUSIONS: The current experiment suggests that NF-κB induced an inflammatory response after CIN and SB could inhibit NF-κB expression protecting against CIN in rats.