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1.
J Pediatr Urol ; 2024 Aug 29.
Artículo en Inglés | MEDLINE | ID: mdl-39244432

RESUMEN

INTRODUCTION/BACKGROUND: The repeated or lengthy use of general anesthesia (GA) in children under three years old is cautioned against due to potential neurodevelopment effects. Spinal anesthesia (SA) has emerged as a safe and effective alternative for routine pediatric urologic procedures. In this study, we describe the use of SA in the urgent surgical treatment of neonatal testicular torsion. OBJECTIVE: We aim to evaluate the safety and efficacy of SA for urgent scrotal exploration in neonates. STUDY DESIGN: We retrospectively collected data on neonates younger than 30 days old undergoing SA for the indication of testicular torsion from May 2018 to June 2022. We recorded patient demographics, adjuvant medications use, and time points for start/stop of spinal injection, procedure, and operating room utilization. RESULTS: Six neonates, with an average age of 1.9 days of life and average weight of 3.4 kg, underwent scrotal exploration for testicular torsion using SA. Four patients (67%) required orchiectomy of the nonviable torsed testicle, and all patients underwent orchiopexy of the unaffected testicle. Mean total operative time was 45.3 (SD 11.7) minutes, including Gomco circumcision in five patients. One patient received preoperative intranasal dexmedetomidine for sedation. Mean time for SA administration was 6.3 (SD 5.5) minutes, with a mean total time in the operating room of 77.3 (SD 9.8) minutes. There were no perioperative or postoperative complications. DISCUSSION: We describe a single institution experience of surgical management of neonatal torsion under SA. In this case series, SA was safely utilized for all neonates involved without the need for conversion to GA or intravenous (IV) sedation. CONCLUSION: The use of SA is safe and efficacious for urgent scrotal exploration for testicular torsion in neonates, even those under 48 h of age. More widespread utilization requires collaboration between pediatric urologists and experienced pediatric anesthesiologists trained in SA.

2.
Artículo en Inglés, Español | MEDLINE | ID: mdl-39128694

RESUMEN

Osteoporosis is a metabolic and systemic disease characterized by alterations at the level of bone tissue with loss of bone mineral density, changes in microarchitecture, mineralization and remodeling that determine greater bone fragility and risk of fracture.Falls in the elderly are a risk factor closely related to fragility fractures and numerous studies demonstrate this relationship.Vertebral fractures are a major cause of morbidity and mortality. The epidemiology differs from osteoporotic fractures at other skeletal sites, as only one-third are clinically recognized. In the elderly, the approach to osteoporotic vertebral fracture involves comprehensive evaluation of the patient since it is both a cause and a consequence of multiple geriatric syndromes. This fracture, in its acute phase and subsequently, can lead to destabilization of other organs and systems of the elderly, medical complications at different levels, functional deterioration, dependence, and even the need for institutionalization.Therefore, multiple assessment of patients with vertebral fractures is necessary, addressing not only the history and risk factors of osteoporosis, but also those factors that lead to falls, as well as a comprehensive geriatric assessment and the complications closely associated with it.In this chapter we address each of these aspects that are necessary in the individual and multidimensional approach to the elderly patient with vertebral fracture due to bone fragility.

4.
Urology ; 2024 Jun 27.
Artículo en Inglés | MEDLINE | ID: mdl-38944387

RESUMEN

OBJECTIVE: To describe long-term lower urinary tract outcomes and incontinence management after AUS erosion, including risk factors associated with each outcome. METHODS: We retrospectively reviewed our prospectively maintained AUS database for men undergoing device explantation for urethral erosion from January 1, 1986 to October 10, 2023. Outcomes included development of urethral stricture and management of post-explant incontinence (eg, pads/clamp, catheter, salvage AUS, supravesical diversion). Risk factors were tested for association with stricture formation and repeat AUS erosion using logistic regression. RESULTS: Around 1943 unique patients underwent AUS implantation during the study period, and 217 (11%) had a device explantation for urethral erosion. Of these, 194 had complete records available and were included for analysis. Median follow-up from implantation was 7.5 years (IQR 2.7-13.7) and median time to erosion was 2 yrs (IQR 0-6). Ninety-six patients (49%) underwent salvage AUS placement. Of those, 38/96 (40%) were explanted for subsequent erosion. On multivariable analysis, no factors were significantly associated with risk of salvage AUS erosion. On multivariable model, pelvic radiation (OR 2.7; 95% CI 1.0-7.4) and urethral reapproximation during explant for erosion (OR 4.2; 95% CI 1.5-11.2) were significantly associated with increased risk of urethral stricture (P <.05). At the time of last follow-up, 69/194 (36%) patients had a functioning salvage AUS, including both initial and subsequent salvage implants. CONCLUSION: Following AUS erosion, radiation history and urethral reapproximation at explantation were risk factors for development of urethral stricture. Salvage AUS replacement can be performed, but has a higher rate of repeat urethral erosion.

5.
Urology ; 190: 110-114, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-38677369

RESUMEN

OBJECTIVE: To evaluate the impact of a standardized perioperative pain management pathway on postoperative opioid prescribing practices following male perineal reconstructive surgery at our institution. METHODS: Patients undergoing perineal reconstructive surgery (urethroplasty, artificial urinary sphincter, urethral sling) by a single surgeon from July 2022 to June 2023 were prospectively followed. A standardized nonopioid pathway was implemented in the perioperative period. Intraoperative local anesthetic included liposomal bupivacaine mixed with 0.25% bupivacaine. Opioids are administered in the recovery room at the discretion of anesthesiology providers. As of July 2022, our standard practice does not include a postoperative opioid prescription unless pain is poorly controlled in the recovery area. Postoperative communication encounters and opioid prescriptions were tracked through the electronic health record (EHR) in order to assess the efficacy of an opioid-free pathway. RESULTS: Sixty-seven patients met the criteria during the study period, 64/67 performed in an outpatient setting. 6/67 (9%) patients were prescribed an opioid postoperatively; 4 related to post-surgical pain, and 2 related to chronic pain. No refills were prescribed. Of the 26 patients who received an opioid in the recovery area, 2 (7.6%) were prescribed an opioid at discharge. 15/67 (22%) patients had a communication encounter related to pain within 30 days, most commonly related to bladder spasm management. Only 2 of these encounters resulted in an electronic opioid prescription. CONCLUSION: An opioid-free pathway is appropriate for opioid naive men undergoing perineal reconstructive surgery. When necessary, electronic opioid prescribing should be employed following discharge for breakthrough pain.


Asunto(s)
Analgésicos Opioides , Dolor Postoperatorio , Perineo , Humanos , Masculino , Proyectos Piloto , Analgésicos Opioides/uso terapéutico , Analgésicos Opioides/administración & dosificación , Perineo/cirugía , Dolor Postoperatorio/tratamiento farmacológico , Persona de Mediana Edad , Estudios Prospectivos , Procedimientos de Cirugía Plástica/métodos , Anciano , Procedimientos Quirúrgicos Urológicos Masculinos/métodos , Manejo del Dolor/métodos , Cabestrillo Suburetral , Esfínter Urinario Artificial , Adulto , Uretra/cirugía , Pautas de la Práctica en Medicina/estadística & datos numéricos
6.
Artículo en Inglés, Español | MEDLINE | ID: mdl-38642739

RESUMEN

Osteoporosis is a metabolic and systemic disease characterized by alterations at the level of bone tissue with loss of bone mineral density, changes in microarchitecture, mineralization and remodeling that determine greater bone fragility and risk of fracture. Falls in the elderly are a risk factor closely related to fragility fractures and numerous studies demonstrate this relationship. Vertebral fractures are a major cause of morbidity and mortality. The epidemiology differs from osteoporotic fractures at other skeletal sites, as only one-third are clinically recognized. In the elderly, the approach to osteoporotic vertebral fracture involves comprehensive evaluation of the patient, since it is both a cause and a consequence of multiple geriatric syndromes. This fracture, in its acute phase and subsequently, can lead to destabilization of other organs and systems of the elderly, medical complications at different levels, functional deterioration, dependence, and even the need for institutionalization. Therefore, it is important to carry out a multiple assessment of patients with vertebral fractures, addressing not only the history and risk factors of osteoporosis, but also those factors that lead to falls, as well as a comprehensive geriatric assessment and the complications closely associated with it. In this chapter we address each of these aspects that are necessary in the individual and multidimensional approach to the elderly patient with vertebral fracture due to bone fragility.

7.
Curr Res Toxicol ; 5: 100128, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37808439

RESUMEN

Glucosamine (GlcN) is the most used supplement for osteoarthritis treatment. In vitro studies have related GlcN to beneficial and detrimental effects on health. The aim of this study was to evaluate the effects of O-linked-N-acetylglucosaminylation (O-GlcNAc) on GlcN-induced ROS production and Nrf2 expression in human dermal microvascular endothelial cells-1 (HMEC-1) and to evaluate the antioxidant capacity of GlcN compared to well-known antioxidants. For this, we evaluate the antioxidant capacity by in vitro assays. Besides, the GlcN (5-20 mM) effects on cell viability, reactive oxygen species (ROS) production, O-GlcNAc, and nuclear factor erythroid-2-related factor 2 (Nrf2) expression with and without the O-GlcNAc inhibitor OSMI-1 (10 µM) in HMEC-1 were evaluated. GlcN showed high inhibitory concentration (low scavenging activity) against superoxide (O2•─, IC20 = 47.67 mM), 2,2-diphenyl-1-picrylhydrazyl (DPPH•, IC50 = 21.32 mM), and hydroxyl (HO•, IC50 = 14.04 mM) radicals without scavenging activity against hydrogen peroxide (H2O2) and low antioxidant capacity determined by oxygen radical absorbance capacity (ORAC, 0.001 mM Trolox equivalent) and ferric reducing antioxidant power (FRAP, 0.046 mM Trolox equivalent). In cell culture, GlcN (20 mM) reduced cell viability up to 26 % and induced an increase in ROS production (up to 70 %), O-GlcNAc (4-fold-higher vs. control), and Nrf2 expression (56 %), which were prevented by OSMI-1. These data suggest an association between O-GlcNAc, ROS production, and Nrf2 expression in HMEC-1 cells stimulated with GlcN.

8.
Urology ; 175: 6-12, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36693529

RESUMEN

The human body was evolutionarily programmed to run on cycles, termed circadian rhythms, which integrate human behavior and bodily function with the environment. Disruptions to these rhythms via desynchronization have been deemed a probable carcinogen by the WHO. Subsequent research has identified alterations in multiple core clock genes when comparing tumor and benign tissues. This review will discuss core clock genes associated with urogenital malignancies and highlight impactful research regarding circadian biology use in treatment. Chronotherapy, treatment alignment with an individual's biological rhythm, remains a relatively untouched field within urology that should be explored to possibly enhance therapeutic outcomes.


Asunto(s)
Ritmo Circadiano , Neoplasias Urológicas , Humanos , Cronoterapia , Neoplasias Urológicas/genética , Neoplasias Urológicas/terapia
9.
Mil Med ; 188(9-10): e3273-e3275, 2023 08 29.
Artículo en Inglés | MEDLINE | ID: mdl-36448494

RESUMEN

The incidence of ischemic stroke in the young is on the rise. With young stroke victims, providers must consider both typical risk factors and other rare causes. We present a case of a healthy, 38-year-old female military dependent who presented with an ischemic right posterior central gyrus stroke in the setting of a patent foramen ovale and supplement diindolylmethane use. This case serves as a reminder of the hazards associated with supplement use and the importance of a thorough investigation of etiology in medical cases of ischemic stroke in the young.


Asunto(s)
Isquemia Encefálica , Foramen Oval Permeable , Accidente Cerebrovascular Isquémico , Accidente Cerebrovascular , Femenino , Humanos , Adulto , Isquemia Encefálica/complicaciones , Accidente Cerebrovascular Isquémico/complicaciones , Accidente Cerebrovascular/complicaciones , Foramen Oval Permeable/complicaciones , Factores de Riesgo
10.
Environ Sci Process Impacts ; 24(10): 1758-1768, 2022 Oct 19.
Artículo en Inglés | MEDLINE | ID: mdl-35979739

RESUMEN

Polyfluoroalkyl phosphate esters (PAPs) can be found throughout society due to their numerous commercial applications. However, they also pose an environmental and health concern given their ability to undergo hydrolysis and oxidation to several bioactive and persistent products, including the perfluorocarboxylic acids (PFCAs). The metabolism of PAPs has been shown to occur in mammalian liver and intestine, however metabolism by the gut microbiome has not yet been investigated. In this study, human fecal samples were used to model the microbial population of the colon, to test whether these anaerobic microbes could facilitate 8:2 monosubstituted PAP (monoPAP) transformation. In vitro testing was completed by incubating the fecal samples with 8:2 monoPAP (400-10,000 nM) up to 120 minutes in an anaerobic chamber. Reactions were then terminated and the samples prepared for GC- and LC-MS/MS analysis. Metabolites of interest were the immediate hydrolysis product, the 8:2 fluorotelomer alcohol (FTOH), and 11 additional metabolites previously shown to form from 8:2 FTOH in both oxic and anoxic environments. The kinetics of 8:2 monoPAP transformation by gut microbiota were compared to those in human S9 liver and intestine fractions, both of which have active levels of hydrolyzing and oxidative enzymes that transform 8:2 monoPAP. Transformation rates from 8:2 monoPAP to 8:2 FTOH were highest in liver S9 > intestine S9 > fecal suspensions. The gut microbiome also produced a unique composition of oxidative metabolites, where the following intermediate metabolites were more abundant than terminal PFCAs: 8:2 fluorotelomer unsaturated carboxylic acid (FTUCA) > 8:2 fluorotelomer carboxylic acid (FTCA) > 7:2 Ketone ≈ perfluorohexanoic acid (PFHxA). Hydrolytic and oxidative metabolites contributed up to 30% of the molar balance after microbial 8:2 monoPAP transformation. Together, the results suggest that the gut microbiome can play a notable role in PAP biotransformation.


Asunto(s)
Fluorocarburos , Microbiota , Animales , Humanos , Fluorocarburos/metabolismo , Tensoactivos , Cromatografía Liquida , Espectrometría de Masas en Tándem , Biotransformación , Organofosfatos , Ácidos Carboxílicos , Fosfatos , Ésteres/metabolismo , Cetonas , Mamíferos/metabolismo
11.
NEJM Evid ; 1(12)2022 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-37635843

RESUMEN

BACKGROUND: Mild cognitive impairment (MCI) increases the risk of dementia. The efficacy of cognitive training in patients with MCI is unclear. METHODS: In a two-site, single-blinded, 78-week trial, participants with MCI - stratified by age, severity (early/late MCI), and site - were randomly assigned to 12 weeks of intensive, home-based, computerized training with Web-based cognitive games or Web-based crossword puzzles, followed by six booster sessions. In mixed-model analyses, the primary outcome was change from baseline in the 11-item Alzheimer's Disease Assessment Scale-Cognitive (ADAS-Cog) score, a 70 point scale in which higher scores indicate greater cognitive impairment at 78 weeks, adjusted for baseline. Secondary outcomes included change from baseline in neuropsychological composite score, University of California San Diego Performance-Based Skills Assessment (functional outcome) score, and Functional Activities Questionnaire (functional outcome) score at 78 weeks, adjusted for baseline. Changes in hippocampal volume and cortical thickness on magnetic resonance imaging were assessed. RESULTS: Among 107 participants (n=51 [games]; n=56 [crosswords]), ADAS-Cog score worsened slightly for games and improved for crosswords at week 78 (least squares [LS] means difference, -1.44; 95% confidence interval [CI], -2.83 to -0.06; P=0.04). From baseline to week 78, mean ADAS-Cog score worsened for games (9.53 to 9.93) and improved for crosswords (9.59 to 8.61). The late MCI subgroup showed similar results (LS means difference, -2.45; SE, 0.89; 95% CI, -4.21 to -0.70). Among secondary outcomes, the Functional Activities Questionnaire score worsened more with games than with crosswords at week 78 (LS means difference, -1.08; 95% CI, -1.97 to -0.18). Other secondary outcomes showed no differences. Decreases in hippocampal volume and cortical thickness were greater for games than for crosswords (LS means difference, 34.07; SE, 17.12; 95% CI, 0.51 to 67.63 [hippocampal volume]; LS means difference, 0.02; SE, 0.01; 95% CI, 0.00 to 0.04 [cortical thickness]). CONCLUSIONS: Home-based computerized training with crosswords demonstrated superior efficacy to games for the primary outcome of baseline-adjusted change in ADAS-Cog score over 78 weeks. (Supported by the National Institutes of Health, National Institute on Aging; ClinicalTrials.gov number, NCT03205709.).

12.
J Pers Assess ; 103(2): 204-213, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-31995393

RESUMEN

In the current study, we used a sample of predominantly African-American women with high rates of trauma exposure (N = 434) to examine psychometric properties of the Personality Inventory for DSM-5-Brief Form (PID-5-BF). We compared model fit between a model with five correlated latent factors and a higher-order model in which the five latent factors were used to estimate a single "general pathology" factor. Additionally, we computed estimates of internal consistency and domain interrelations and examined indices of convergent/discriminant validity of the PID-5-BF domains by examining their relations to relevant criterion variables. The expected five-factor structure demonstrated good fit indices in a confirmatory factor analysis, and the more parsimonious, higher-order model was retained. Within this higher-order model, the first-order factors accounted for more variance in the criterion variables than the general pathology factor in most instances. The PID-5-BF domains were highly interrelated (rs = .38 to .66), and convergent/discriminant validity of the domains varied: Negative Affectivity and Detachment generally showed the hypothesized pattern of relations with external criteria, while Antagonism and Disinhibition displayed less consistent and discriminant relations. Results are discussed in terms of the costs and benefits of using brief pathological trait measures in samples characterized by high levels of psychopathology.


Asunto(s)
Negro o Afroamericano/psicología , Víctimas de Crimen/psicología , Trastornos de la Personalidad/diagnóstico , Inventario de Personalidad/normas , Adulto , Pruebas Diagnósticas de Rutina , Manual Diagnóstico y Estadístico de los Trastornos Mentales , Femenino , Humanos , Problema de Conducta , Psicometría , Reproducibilidad de los Resultados , Estrés Psicológico/diagnóstico
13.
Rev. Esp. Cir. Ortop. Traumatol. (Ed. Impr.) ; 61(6): 427-435, nov.-dic. 2017. tab, graf
Artículo en Español | IBECS | ID: ibc-168639

RESUMEN

Objetivos. Analizar las características de los pacientes ingresados por fractura de cadera y su evolución 6 meses tras la cirugía para determinar los factores potencialmente relacionados con estancia hospitalaria, complicaciones médicas, mortalidad y recuperación funcional tras esta enfermedad tan prevalente y con graves consecuencias. Material y métodos. Estudio prospectivo de un grupo de 130 pacientes mayores de 75 años hospitalizados por fractura de cadera de perfil osteoporótico. Se evaluaron sus antecedentes médicos, situación mental y física previas a la caída, tipos de fractura y tratamiento quirúrgico, complicaciones hospitalarias, así como evolución funcional y social tras la hospitalización. Resultados. Los pacientes que tenían mayor grado de deterioro físico y mental previamente a la fractura y los institucionalizados tuvieron peor capacidad de recuperación tras la cirugía. El empleo de terapias alternativas a la transfusión para el tratamiento de la anemia se relacionó con disminución de estancia hospitalaria y mejor capacidad de deambulación a medio plazo. Las principales complicaciones médicas en el ingreso fueron infección e insuficiencia cardiaca, e implicaron prolongación de la hospitalización. La prescripción de suplementos nutricionales en pacientes adecuadamente seleccionados se relacionó con mejor evolución funcional. Conclusiones. La valoración de la situación mental, física y social previas a la fractura debe ser la base de un plan de tratamiento individualizado por ser claramente determinante de pronóstico. Los equipos multidisciplinares con seguimiento médico continuado simultáneo al quirúrgico son importantes para prevenir y tratar precozmente las frecuentes complicaciones perioperatorias. La administración de ferroterapia intravenosa y la prescripción de suplementos de nutrición pueden mejorar la recuperación física a medio plazo del paciente intervenido fractura de cadera (AU)


Objectives. Due to its high prevalence and serious consequences it is very important to be well aware of factors that might be related to medical complications, mortality, hospital stay and functional recovery in elderly patients with hip fracture. Material and methods. A prospective study of a group of 130 patients aged over 75 years admitted for osteoporotic hip fracture. Their medical records, physical and cognitive status prior to the fall, fracture type and surgical treatment, medical complications and functional and social evolution after hospitalization were evaluated. Results. Patients with greater physical disability, more severe cognitive impairment and those who lived in a nursing home before the fracture had worse functional recovery after surgery. Treatment with intravenous iron to reduce transfusions reduced hospital stay and improved walking ability. Infections and heart failure were the most frequent medical complications and were related to a longer hospital stay. The prescription of nutritional supplements for the patients with real indication improved their physical recovery after the hip fracture. Conclusions. Evaluation of physical, cognitive and social status prior to hip fracture should be the basis of an individual treatment plan because of its great prognostic value. Multidisciplinary teams with continuous monitoring of medical problems should prevent and treat complications as soon as possible. Intravenous iron and specific nutritional supplements can improve functional recovery six months after hip fracture (AU)


Asunto(s)
Humanos , Anciano , Fracturas de Cadera/cirugía , Fijación Interna de Fracturas/estadística & datos numéricos , Tiempo de Internación/estadística & datos numéricos , Mortalidad Hospitalaria , Estudios Prospectivos , Fracturas Osteoporóticas/cirugía , Resultado del Tratamiento , Recuperación de la Función , Anemia Ferropénica/tratamiento farmacológico , Hierro/administración & dosificación
14.
Rev Esp Cir Ortop Traumatol ; 61(6): 427-435, 2017.
Artículo en Inglés, Español | MEDLINE | ID: mdl-28888685

RESUMEN

OBJECTIVES: Due to its high prevalence and serious consequences it is very important to be well aware of factors that might be related to medical complications, mortality, hospital stay and functional recovery in elderly patients with hip fracture. MATERIAL AND METHODS: A prospective study of a group of 130 patients aged over 75 years admitted for osteoporotic hip fracture. Their medical records, physical and cognitive status prior to the fall, fracture type and surgical treatment, medical complications and functional and social evolution after hospitalization were evaluated. RESULTS: Patients with greater physical disability, more severe cognitive impairment and those who lived in a nursing home before the fracture had worse functional recovery after surgery. Treatment with intravenous iron to reduce transfusions reduced hospital stay and improved walking ability. Infections and heart failure were the most frequent medical complications and were related to a longer hospital stay. The prescription of nutritional supplements for the patients with real indication improved their physical recovery after the hip fracture CONCLUSIONS: Evaluation of physical, cognitive and social status prior to hip fracture should be the basis of an individual treatment plan because of its great prognostic value. Multidisciplinary teams with continuous monitoring of medical problems should prevent and treat complications as soon as possible. Intravenous iron and specific nutritional supplements can improve functional recovery six months after hip fracture.


Asunto(s)
Fijación de Fractura , Fracturas de Cadera/cirugía , Tiempo de Internación/estadística & datos numéricos , Fracturas Osteoporóticas/cirugía , Complicaciones Posoperatorias/etiología , Recuperación de la Función , Factores de Edad , Anciano , Anciano de 80 o más Años , Femenino , Estudios de Seguimiento , Fracturas de Cadera/mortalidad , Fracturas de Cadera/fisiopatología , Humanos , Modelos Lineales , Modelos Logísticos , Masculino , Fracturas Osteoporóticas/mortalidad , Fracturas Osteoporóticas/fisiopatología , Complicaciones Posoperatorias/epidemiología , Estudios Prospectivos , Factores de Riesgo , Resultado del Tratamiento
15.
Soft Matter ; 13(38): 6810-6815, 2017 Oct 04.
Artículo en Inglés | MEDLINE | ID: mdl-28819662

RESUMEN

Chromonic liquid crystals (CLC) are lyotropic phases formed by discotic mesogens in water. Simple chiral dopants such as amino acids have been reported to turn chromonic liquid crystals into their cholesteric counterparts. Here we report a chirality amplification effect in the nematic phase of a 9 wt% disodium cromoglycate (DSCG) lyotropic liquid crystal (LLC) upon doping with a water-soluble codeine derivative. The transition on cooling the isotropic to the nematic phase showed the presence of homochiral spindle-shaped droplets (tactoids). NMR DOSY experiments on a triple gradient probe revealed a small degree of diffusion anisotropy for the alkaloid embedded in the liquid crystal structure. These results in combination with XRD, CD and POM experiments agree with a supramolecular aggregation model based on simple columnar stacks.

16.
Soft Matter ; 11(30): 6009-17, 2015 Aug 14.
Artículo en Inglés | MEDLINE | ID: mdl-26126988

RESUMEN

In this paper, we present the preparation and properties of some ionic PAMAM derivatives, which combine hydrophilic and lipophilic carboxylic acid chains as counter-ions for all protonable inner and outer amino groups. The amphiphilic nature of the final ionic codendrimers and, hence, their self-assembling features can be modulated by using different ratios between hydrophilic and lipophilic chains. In the bulk, these new materials self-organize into smectic A liquid crystal phases. In water, they self-assemble into different types of nano-objects depending on the molecular composition. The study of the morphology of these nano-structures, their cytotoxicity and their capability to encapsulate a lipophilic anticancer drug are reported herein. Some of these nanoobjects are non-cytotoxic and present good drug trapping ability, which make them interesting nanocarriers for applications in nanotechnology and biomedicine.


Asunto(s)
Antineoplásicos/química , Dendrímeros/química , Sistemas de Liberación de Medicamentos , Nanoestructuras/química , Neoplasias/tratamiento farmacológico , Antineoplásicos/uso terapéutico , Dendrímeros/síntesis química , Dendrímeros/uso terapéutico , Humanos , Interacciones Hidrofóbicas e Hidrofílicas , Iones/química , Cristales Líquidos/química , Nanoestructuras/uso terapéutico , Nanotecnología , Agua/química
20.
Rev Clin Esp ; 207(2): 86-90, 2007 Feb.
Artículo en Español | MEDLINE | ID: mdl-17397570

RESUMEN

Clostridium difficile is the leading cause of infectious nosocomial diarrhea in the elderly. It may cause colitis of variable severity and extraintestinal involvement. Hand transmission is the most important, and it is related to prolonged antibiotic therapies in elderly patients with severe baseline disease. Diagnosis is based on culture and immunological tests to detect its toxins. When there is no response to conservative treatment (withdrawal of the antibiotic and support therapy), metronidazole or vancomycin should be given. Recurrences, up to 20%, are frequent. Preventive measures of its spreading are essential due to the elevated transmission through health care personnel and instruments. Detection of new, more virulent, gene variants of Clostridium difficile have increased the importance of this disease.


Asunto(s)
Clostridioides difficile , Infección Hospitalaria , Diarrea/etiología , Enterocolitis Seudomembranosa , Factores de Edad , Anciano , Antibacterianos/uso terapéutico , Antiinfecciosos/uso terapéutico , Clostridioides difficile/aislamiento & purificación , Infección Hospitalaria/diagnóstico , Infección Hospitalaria/tratamiento farmacológico , Infección Hospitalaria/epidemiología , Infección Hospitalaria/microbiología , Infección Hospitalaria/transmisión , Diarrea/diagnóstico , Diarrea/epidemiología , Diarrea/microbiología , Enterocolitis Seudomembranosa/diagnóstico , Enterocolitis Seudomembranosa/tratamiento farmacológico , Enterocolitis Seudomembranosa/epidemiología , Enterocolitis Seudomembranosa/transmisión , Humanos , Metronidazol/uso terapéutico , Recurrencia , Vancomicina/uso terapéutico
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