ABSTRACT
SUMMARY Objective : This study aimed at: 1) Assessment of the frequency of stroke and related mortality rate in patients hospitalized for COVID-19 in two major hospital referral centers in Peru; 2) Exploration of factors associated to mortality and dependency in these patients; 3) Comparisons of frequency of admissions of stroke patients and reperfusion treatments in similar periods of time prior to (2019) and during the pandemia occurrence. Material and Methods : A retrospective cohort study was conducted in two of the largest referral hospital centers for COVID-19 in Peru. The study included patient victims of stroke and COVID-19, hospitalized between April and August 2020. Demographic, clinical and laboratory data, radiological findings, and severity levels measured by the NIHSS scale were collected. Poisson regression models to evaluate associated factors to mortality and dependency were applied. Results : A 31% reduction of admissions for stroke, and of 81% of intravenous reperfusion treatment, respectively, were found in 2020 when compared with 2019. 1.37% of the patients with COVID-19 experienced a stroke, with an overall mortality rate of 40.6%, and a dependency rate of 68.3% at discharge time (Rankin > 2). An age increase of 10 years was found in mortality, associated with a 29% increase in mortality risk. As well, having hypertension, chronic kidney disease, inflammatory markers (D dimer and ferritin) and the severity of the stroke were associated with mortality. Finally, the severity of stroke, lymphopenia, and inflammatory markers (D dimer and fibrinogen) were associated with greater risk of dependency. Conclusions : The care system of stroke patients was affected by the COVID-19 pandemic in two of Perú's major public hospitals. There was a decrease in admissions and reperfusion treatments of stroke cases, and 1.37% of patients with COVID-19 presented a stroke. Age, hypertension, chronic kidney disease, inflammatory markers and severity of stroke were associated with mortality in these patients.
RESUMEN Objetivo : Los objetivos del presente trabajo fueron: 1) Evaluar la frecuencia de accidente cerebrovascular (ACV) y de la tasa de mortalidad en pacientes hospitalizados por COVID-19 en dos importantes centros hospitalarios de referencia en Perú, 2) Exploración de factores asociados a mortalidad y dependencia en estos pacientes, 3) Comparar la frecuencia de admisiones de pacientes con ACV y de los tratamientos de reperfusión en tiempo de pandemia y en periodos previos (2019). Material y Métodos : Se realizó un estudio retrospectivo en dos de los mayores centros hospitalarios de referencia en Perú, incluyendo pacientes con ACV y COVID-19 hospitalizados entre abril y agosto del 2020. Se recolectó información demográfica, clínica y de laboratorio, hallazgos radiológicos y niveles de severidad medidos por la escala NIHSS, y se utilizó un modelo de regresión de Poisson para evaluar los factores asociados a mortalidad y dependencia. Resultados : Se encontró una disminución del 31% de admisiones hospitalarias de pacientes con ACV (ictus) y del 81% de los tratamientos de reperfusión endovenosa en el 2020 con respecto al 2019. Un 1.37% de pacientes con COVID-19 experimentaron ACV, con una mortalidad global de 40.6% y dependencia al alta del 58.3% (rankin >2). Un incremento de 10 años en edad se asoció con un aumento del 29% en el riesgo de mortalidad. Hipertensión arterial, enfermedad renal crónica, marcadores inflamatorios (Dímero D y ferritina) y la gravedad del ictus se encontraron asociados con mortalidad. La gravedad del ictus, la linfopenia y los marcadores inflamatorios (Dimero D y fibrinógeno) estuvieron asociados a un mayor riesgo de dependencia. Conclusión : El sistema de atención de ACVs se vio afectado por la pandemia del COVID-19 en dos de los centros hospitalarios públicos más grandes del Perú. Se encontró una disminución en las admisiones hospitalarias y en los tratamientos de reperfusión de estos pacientes durante la pandemia. Edad, hipertensión, enfermedad renal crónica, marcadores inflamatorios y gravedad del ictus fueron factores asociados con la mortalidad de pacientes con COVID-19 y ACV.
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Block copolymers (BCPs) are of growing interest because of their extensive utility in tissue engineering, particularly in biomimetic approaches where multifunctionality is critical. We synthesized polycaprolactone-polyacrylic acid (PCL-b-PAA) BCP and crystallized it onto PCL nanofibers, making BCP nanofiber shish kebab (BCP NFSK) structures. When mineralized in 2× simulated body fluid, BCP NFSK mimic the structure of mineralized collagen fibrils. We hypothesized that the addition of a calcium phosphate layer of graded roughness on the nano-structure of the nanofiber shish kebabs would enhance preosteoblast alkaline phosphatase (ALP) activity, which has been shown to be a critical component in bone matrix formation. The objectives in the study were to investigate the effect of mineralization on cell proliferation and ALP activity, and to also investigate the effect of BCP NFSK periodicity, a structural feature describing the distance between PCL-b-PAA crystals on the nanofiber core, on cell proliferation, and ALP activity. ALP activity of cells cultured on the mineralized BCP NFSK template was significantly higher than the nonmineralized BCP NFSK templates. Interestingly, no statistical difference was observed in ALP activity when the periodic varied, indicating that surface chemistry seemed to play a larger role than the surface roughness.
Subject(s)
Acrylic Resins/chemistry , Calcium Phosphates/chemistry , Collagen/chemistry , Nanofibers/chemistry , Polyesters/chemistry , Tissue Scaffolds/chemistry , 3T3 Cells , Animals , Biocompatible Materials/chemistry , Bone and Bones , Cell Adhesion/drug effects , Cell Proliferation/drug effects , Extracellular Matrix/chemistry , Humans , Mice , Osteoblasts , Osteogenesis/drug effects , Tissue EngineeringABSTRACT
Biomimetic proteoglycans (BPGs) have the potential to treat osteoarthritis (OA) given that these molecules mimic the structure and properties of natural proteoglycans, which are significantly reduced in OA. We examined the effects of BPGs injected into the intra-articular space in an in vivo OA rabbit knee model and evaluated the effect on histological response, joint friction, and BPG distribution and retention. Rabbits underwent ACL transection to create an arthritic state after 5 weeks. OA rabbits were treated with BPGs or Euflexxa® (hyaluronic acid) intra-articular injections. Non-OA rabbits were injected similarly with BPGs; contralateral joints served as controls. The progression of OA and response to injections were evaluated using Mankin and gross grading systems indicating that mild OA was achieved in operated joints. The coefficient of friction (COF) of the intact knee joints were measured using a custom pendulum friction apparatus, showing that OA joints and OA + Euflexxa® joints demonstrated increased COF than non-operated controls, while BPG-injected non-OA and OA + BPGs were not significantly different from non-OA controls. Injected fluorescently labeled BPGs demonstrated that BPGs diffused into cartilage with localization in the pericellular region. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:403-411, 2019.
Subject(s)
Osteoarthritis, Knee/drug therapy , Proteoglycans/therapeutic use , Animals , Biomimetic Materials , Cartilage, Articular/pathology , Drug Evaluation, Preclinical , Female , Fluorescent Dyes , Friction/drug effects , Osteoarthritis, Knee/pathology , Proteoglycans/pharmacology , RabbitsABSTRACT
La neurocisticercosis es una enfermedad frecuente, su principal ubicación es en el parénquima cerebral; sin embargo, menos del 5% de los casos son de ubicación espinal donde producen cuadros clínicos pseudotumorales u obstructivos. Presentamos el caso de un paciente que ingresa por cefalea crónica con signos de hipertensión endrocraneana, sin clínica medular, y en quien se obtuvo durante el estudio de punción lumbar una membrana cisticercótica y líquido cefalorraquídeo con gran consumo de glucosa (3mg/dL). El hallazgo de un cisticerco de ubicación intradural-extramedular durante una punción lumbar es un hallazgo muy raro, solo descrito en pacientes con clínica evidente. Recomendamos sospecharla cuando no haya evidencia clínica de compromiso medular pero se tenga sugerencia de cisticercosis cerebral y líquido cefalorraquídeo alterado, ampliando el estudio con neuroimágenes.
Neurocysticercosis is a frequent disease, its main location is in the brain parenchyma; however, less than 5% of cases are of spinal location where they produce pseudotumoral or obstructive clinical manifestations. We present the case of a patient admitted due to chronic headache with signs of endrocranial hypertension, without clinical symptoms, and in whom a cysticercotic membrane and cerebrospinal fluid with high glucose consumption (3mg/dL) was obtained during the lumbar puncture study. The finding of a cysticercus of intradural-extramedullary location, during a lumbar puncture is a very rare finding, only described in patients with evident clinical signs. We recommend suspecting it when there is no clinical evidence of spinal cord involvement but there is a suggestion of cerebral cysticercosis and altered cerebrospinal fluid, expanding the study with neuroimaging.
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