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1.
J Hosp Infect ; 142: 115-129, 2023 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-37858806

RESUMEN

BACKGROUND: Estimates of inappropriate prescribing can highlight key target areas for antimicrobial stewardship (AMS) and inform national targets. OBJECTIVES: To (1) define and (2) produce estimates of inappropriate antibiotic prescribing levels within acute hospital trusts in England. METHODS: The 2016 national Healthcare-Associated Infections (HAI), Antimicrobial Use (AMU) and AMS point prevalence survey (PPS) was used to derive estimates of inappropriate prescribing, focusing on the four most reported community-acquired antibiotic indications (CAIs) in the PPS and surgical prophylaxis. Definitions of appropriate antibiotic therapy for each indication were developed through the compilation of national treatment guidelines. A Likert-scale system of appropriateness coding was validated and refined through a two-stage expert review process. RESULTS: Antimicrobial usage prevalence data were collected for 25,741 individual antibiotic prescriptions, representing 17,884 patients and 213 hospitals in England. 30.4% of prescriptions for the four CAIs of interest were estimated to be inappropriate (2054 prescriptions). The highest percentage of inappropriate prescribing occurred in uncomplicated cystitis prescriptions (62.5%), followed by bronchitis (48%). For surgical prophylaxis, 30.8% of prescriptions were inappropriate in terms of dose number, and 21.3% in terms of excess prophylaxis duration. CONCLUSIONS: The 2016 prevalence of inappropriate antibiotic prescribing in hospitals in England was approximated to be 30.4%; this establishes a baseline prevalence and provided indication of where AMS interventions should be prioritized. Our definitions appraised antibiotic choice, treatment duration and dose number (surgical prophylaxis only); however, they did not consider other aspects of appropriateness, such as combination therapy - this is an important area for future work.


Asunto(s)
Antiinfecciosos , Infecciones Comunitarias Adquiridas , Humanos , Antibacterianos/uso terapéutico , Profilaxis Antibiótica , Prevalencia , Infecciones Comunitarias Adquiridas/tratamiento farmacológico , Infecciones Comunitarias Adquiridas/prevención & control , Antiinfecciosos/uso terapéutico , Prescripciones , Inglaterra/epidemiología , Prescripciones de Medicamentos
2.
Phys Chem Chem Phys ; 24(48): 29640-29654, 2022 Dec 14.
Artículo en Inglés | MEDLINE | ID: mdl-36449332

RESUMEN

LaIr3Ga2 is a kagome superconductor with a superconducting temperature (Tc) of 5.16 K. Here, we present the physical properties of the LaIr3Ga2 kagome superconductor computed via the DFT method wherein six different exchange-correlation functionals were used. The lattice parameters obtained using different functionals are reasonable, with a slight variation compared to experimental values. The bonding nature was explored. The elastic constants (Cij), moduli (B, G, Y), and Vickers hardness (Hv) were computed to disclose the mechanical behavior. The Hv values were estimated to be 2.56-3.16 GPa using various exchange-correlation functionals, indicating the softness of the kagome material. The Pugh ratio, Poisson's ratio, and Cauchy pressure revealed the ductile nature. In addition, mechanical stability was ensured based on the estimated elastic constants. The anisotropic mechanical behavior was confirmed via different anisotropic indices. The Debye temperature (ΘD), melting temperature (Tm), and minimum thermal conductivity (kmin) were calculated to characterize the thermal properties and predict the potential of LaIr3Ga2 as a thermal barrier coating material. The electronic density of states was investigated in detail. The McMillan equation was used to estimate Tc, and the electron-phonon coupling constant (λ) was calculated to explore the superconducting nature. The important optical constants were also calculated to explore its possible optoelectronic applications. The values of reflectivity in the IR-visible region are about 62% to 80%, indicating that the compound under study is suitable as a coating to reduce solar heating. The obtained parameters were compared with previously reported parameters, where available.

5.
Hum Exp Toxicol ; 40(9): 1558-1571, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-33754881

RESUMEN

Colon cancer is a life-threatening disease all over the world and is linked to constant oxidative stress and inflammation. Epigallocatechin gallate (EGCG), is a naturally occurring flavone possessing health benefiting pharmacological properties including antioxidant, anti-inflammatory and free radical scavenging properties. Our study investigates the role of EGCG on N,N'-dimethylhydrazine (DMH), a toxic environmental pollutant, induced colon toxicity. To investigate the effect of EGCG, Wistar rats were given EGCG for 7 days at the two doses of 10 and 20 mg/kg body weight and DMH was injected on the seventh day in all the group rats except the control. Our results indicate that DMH administration increased the oxidative stress (MDA) and depleted the glutathione and antioxidant enzyme activities (SOD, CAT, GR, GST and GPx) which was significantly ameliorated by EGCG treatment. Additionally DMH treatment upregulated inflammatory markers expression (NF-κB, COX-2 and IL-6) and enhanced mucosal damage in the colon. EGCG treatment significantly reduced inflammation and restored the normal histoarchitecture of the colon. We can conclude from the present study findings that EGCG protects the colon from DMH toxicity through its antioxidant and anti-inflammatory potential.


Asunto(s)
1,2-Dimetilhidrazina/toxicidad , Anticarcinógenos/farmacología , Anticarcinógenos/uso terapéutico , Carcinógenos/toxicidad , Catequina/análogos & derivados , Catequina/uso terapéutico , Neoplasias del Colon/inducido químicamente , Neoplasias del Colon/tratamiento farmacológico , Animales , Neoplasias del Colon/fisiopatología , Modelos Animales de Enfermedad , Humanos , Masculino , Ratas , Ratas Wistar
6.
J Hosp Infect ; 105(2): 280-288, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32035998

RESUMEN

BACKGROUND: Antibiotic-associated diarrhoea (AAD) is a side-effect of antibiotic consumption and probiotics have been shown to reduce AAD. METHODS: A multicentre, double-blind, placebo-controlled, randomized trial was conducted to evaluate the role of Lactobacillus casei DN114001 (combined as a drink with two regular yoghurt bacterial strains) in reducing AAD and Clostridioides difficile infection in patients aged over 55 years. The primary outcome was the incidence of AAD during 2 weeks of follow-up. RESULTS: A total of 1127 patients (mean age ± standard deviation: 73.6 ± 10.5) were randomized to the active group (N = 549) or placebo group (N = 577). Both groups were followed up as per protocol. The proportion of patients experiencing AAD during follow-up was 19.3% (106/549) in the probiotic group vs 17.9% (103/577) in the placebo group (unadjusted odds ratio 1.10, 95% confidence interval 0.82-1.49, P = 0.53). CONCLUSIONS: No significant evidence was found of a beneficial effect of the specific probiotic formulation in preventing AAD in this elderly population drawn from a number of different UK hospitals. However, in the UK and in many other healthcare systems there have, in recent years, been many changes in antibiotic stewardship policies, an overall decrease in incidence in C. difficile infection, as well as an increased awareness of infection prevention, and modifications in nursing practice. In light of these factors, it is impossible to conclude definitively from the current trial that the study-specific probiotic formulation has no role in preventing AAD, and it is our view that further trials may be indicated, controlling for these variables.


Asunto(s)
Antibacterianos/efectos adversos , Infecciones por Clostridium/prevención & control , Diarrea/etiología , Probióticos/administración & dosificación , Anciano , Anciano de 80 o más Años , Antibacterianos/uso terapéutico , Infecciones por Clostridium/complicaciones , Infecciones por Clostridium/tratamiento farmacológico , Diarrea/microbiología , Método Doble Ciego , Femenino , Hospitales , Humanos , Incidencia , Lacticaseibacillus casei/fisiología , Masculino , Persona de Mediana Edad , Reino Unido , Yogur/microbiología
7.
Clin Microbiol Infect ; 26(1): 41-50, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31493472

RESUMEN

BACKGROUND: Antimicrobial stewardship interventions and programmes aim to ensure effective treatment while minimizing antimicrobial-associated harms including resistance. Practice in this vital area is undermined by the poor quality of research addressing both what specific antimicrobial use interventions are effective and how antimicrobial use improvement strategies can be implemented into practice. In 2016 we established a working party to identify the key design features that limit translation of existing research into practice and then to make recommendations for how future studies in this field should be optimally designed. The first part of this work has been published as a systematic review. Here we present the working group's final recommendations. METHODS: An international working group for design of antimicrobial stewardship intervention evaluations was convened in response to the fourth call for leading expert network proposals by the Joint Programming Initiative on Antimicrobial Resistance (JPIAMR). The group comprised clinical and academic specialists in antimicrobial stewardship and clinical trial design from six European countries. Group members completed a structured questionnaire to establish the scope of work and key issues to develop ahead of a first face-to-face meeting that (a) identified the need for a comprehensive systematic review of study designs in the literature and (b) prioritized key areas where research design considerations restrict translation of findings into practice. The working group's initial outputs were reviewed by independent advisors and additional expertise was sought in specific clinical areas. At a second face-to-face meeting the working group developed a theoretical framework and specific recommendations to support optimal study design. These were finalized by the working group co-ordinators and agreed by all working group members. RESULTS: We propose a theoretical framework in which consideration of the intervention rationale the intervention setting, intervention features and the intervention aims inform selection and prioritization of outcome measures, whether the research sets out to determine superiority or non-inferiority of the intervention measured by its primary outcome(s), the most appropriate study design (e.g. experimental or quasi- experimental) and the detailed design features. We make 18 specific recommendation in three domains: outcomes, objectives and study design. CONCLUSIONS: Researchers, funders and practitioners will be able to draw on our recommendations to most efficiently evaluate antimicrobial stewardship interventions.


Asunto(s)
Programas de Optimización del Uso de los Antimicrobianos/organización & administración , Programas de Optimización del Uso de los Antimicrobianos/normas , Consenso , Antibacterianos/uso terapéutico , Bacterias/efectos de los fármacos , Ensayos Clínicos como Asunto , Europa (Continente) , Humanos , Internacionalidad , Proyectos de Investigación , Encuestas y Cuestionarios
8.
Hum Exp Toxicol ; 39(9): 1133-1146, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31797688

RESUMEN

Benign prostatic hyperplasia (BPH) is an important key health concern for aging men. Polyphenolic compounds have been found to possess important roles in the inhibition of numerous ailments that involve reactive oxygen species and inflammation. Diosmin is a citrus flavone that possesses antioxidant, anti-inflammatory, antiproliferative, and anticancer activities, so based on these properties of diosmin, we decided to evaluate its effect on testosterone propionate (TP)-induced BPH. A total of 30 Wistar rats were randomly assigned to five groups having six animals in each. This study was of 28 days in which TP (5 mg kg-1) was administered to induce BPH in the last 10 days of the study. It was found that diosmin at the doses of 20 and 40 mg kg-1 significantly reduced malondialdehyde and xanthine oxidase formation in a dose-dependent manner; however, it replenished catalase, glutathione (GSH), and GSH-dependent enzymes, that is, glutathione peroxidase, glutathione reductase, and glutathione-S-transferase significantly against TP-induced BPH. Further, immunohistochemical study showed that diosmin alleviated inflammatory markers (nuclear factor kappa-light-chain-enhancer of activated B cells, cyclooxygenase-2, and interleukin-6). It was also found that diosmin downregulated the expression of androgen receptor and decreased the prostate-specific antigen concentration dose-dependently, significantly against TP-induced BPH. Diosmin also restored histoarchitecture of the prostate in a dose-dependent manner. Findings from the present study revealed the protective role of diosmin against TP-induced BPH in Wistar rats.


Asunto(s)
Antiinflamatorios no Esteroideos/farmacología , Antineoplásicos/farmacología , Diosmina/farmacología , Inflamación/metabolismo , Estrés Oxidativo/efectos de la radiación , Hiperplasia Prostática/prevención & control , Propionato de Testosterona/antagonistas & inhibidores , Animales , Antiinflamatorios no Esteroideos/administración & dosificación , Antineoplásicos/administración & dosificación , Catalasa/análisis , Diosmina/administración & dosificación , Glutatión/análisis , Glutatión Peroxidasa/metabolismo , Glutatión Reductasa/metabolismo , Inflamación/prevención & control , Masculino , Antígeno Prostático Específico/sangre , Hiperplasia Prostática/inducido químicamente , Hiperplasia Prostática/patología , Ratas , Ratas Wistar
9.
J Hosp Infect ; 103(3): 268-275, 2019 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-31394146

RESUMEN

BACKGROUND: Antimicrobial stewardship initiatives in secondary care depend on clinicians undertaking antibiotic prescription reviews but decisions to limit antibiotic treatment at review are complex. AIM: To assess the feasibility and acceptability of implementing ARK (Antibiotic Review Kit), a behaviour change intervention made up of four components (brief online tool, prescribing decision aid, regular data collection and feedback process, and patient leaflet) to support stopping antibiotic treatment when it is safe to do so among hospitalized patients; before definitive evaluation through a stepped-wedge cluster-randomized controlled trial. METHODS: Acceptability of the different intervention elements was assessed for a period of 12 weeks by uptake of the online tool, adoption of the decision aid into prescribing practice, and rates of decisions to stop antibiotics at review (assessed through repeated point-prevalence surveys). Patient perceptions of the information leaflet were assessed through a brief questionnaire. FINDINGS: All elements of the intervention were successfully introduced into practice. A total of 132 staff encompassing a broad range of prescribers and non-prescribers completed the online tool (19.4 per 100 acute beds), including 97% (32/33) of the pre-specified essential clinical staff. Among 588 prescription charts evaluated in seven point-prevalence surveys over the 12-week implementation period, 82% overall (76-90% at each survey) used the decision aid. The median antibiotic stop rate post implementation was 36% (range: 29-40% at each survey) compared with 9% pre implementation (P < 0.001). CONCLUSION: ARK provides a feasible and acceptable mechanism to support stopping antibiotics safely at post-prescription reviews in an acute hospital setting.


Asunto(s)
Antibacterianos/uso terapéutico , Programas de Optimización del Uso de los Antimicrobianos/métodos , Terapia Conductista/métodos , Aceptación de la Atención de Salud , Actitud del Personal de Salud , Estudios de Factibilidad , Hospitales , Humanos
10.
Mymensingh Med J ; 28(1): 182-192, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30755568

RESUMEN

Spine injuries, a common component in Polytrauma are usually affects the young people and is a major cause of morbidity and poses a significant health care expenditure and considerable threats to survival and quality of life. We retrospectively assess the demographics, incidence, mode of trauma, associated spine injuries, complications, neurological improvement and mortality. Records of total 1695 admitted patients, spinal injuries were 262 patients. Among them 30(11.45%) patients were associated with Polytrauma victims. Eleven patients (36.67%) were admitted through Ortho emergency dept, 14(46.67%) patients through Intensive care unit (ICU), 5(16.66%) patients through other department (CVS, Urology). Most (56%) of the patients were young in the age range of 16 to 40 years. Cervical spines were most commonly (44%) affected followed by lumbar (31%), thoracic (13%), thoraco-lumbar (9%) and Cervico-thoracic (3%) spines. Road traffic accident was the common cause (80%). Twelve patients (40%) had problems at various steps of management and maximum problems occur in step III. Nineteen patients (63.33%) management needs co-ordination between various specialties. Significant number of patients (76.67%) required operative treatment (p<0.05) and 13.33% were managed conservatively. Mortality rate (10%) was insignificant (p>0.05%). Of these patients, 73.33% had shown neurological improvement of at least one ASIA grade. The treatment of spinal injury in polytrauma patient should follow the principle of Advanced Trauma Life Support (ATLS). Once life and limb-threatening injuries have been identified and addressed, suspected spinal cord injury patients should be immobilized as early as possible to reduced the secondary injury, improve motor and sensory function as well as reduced the extend of permanent paralysis.


Asunto(s)
Traumatismo Múltiple/cirugía , Traumatismos de la Médula Espinal/cirugía , Traumatismos Vertebrales/cirugía , Adolescente , Adulto , Femenino , Humanos , Puntaje de Gravedad del Traumatismo , Masculino , Traumatismo Múltiple/epidemiología , Calidad de Vida , Estudios Retrospectivos , Traumatismos de la Médula Espinal/epidemiología , Traumatismos Vertebrales/epidemiología , Centros de Atención Terciaria , Resultado del Tratamiento , Adulto Joven
11.
Clin Microbiol Infect ; 25(5): 555-561, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-30472426

RESUMEN

BACKGROUND: Antimicrobial stewardship aims to optimize antibiotic use and minimize selection of antimicrobial resistance. The methodological quality of published studies in this field is unknown. AIMS: Our objective was to perform a comprehensive systematic review of antimicrobial stewardship research design and identify features which limit validity and translation of research findings into clinical practice. SOURCES: The following online database was searched: PubMed. STUDY ELIGIBILITY CRITERIA: Studies published between January 1950 and January 2017, evaluating any antimicrobial stewardship intervention in the community or hospital setting, without restriction on study design or outcome. CONTENT: We extracted data on pre-specified design quality features and factors that may influence design choices including (1) clinical setting, (2) age group studied, (3) when the study was conducted, (4) geographical region, and (5) financial support received. The initial search yielded 17 382 articles; 1008 were selected for full-text screening, of which 825 were included. Most studies (675/825, 82%) were non-experimental; 104 (15%) used interrupted time series analysis, 41 (6%) used external controls, and 19 (3%) used both. Studies in the community setting fulfilled a median of five out of 10 quality features (IQR 3-7) and 3 (IQR 2-4) in the hospital setting. Community setting studies (25%, 205/825) were significantly more likely to use randomization (OR 5.9; 95% CI 3.8-9.2), external controls (OR 5.6; 95% CI 3.6-8.5), and multiple centres (OR 10.5; 95% CI 7.1-15.7). From all studies, only 48% (398/825) reported clinical and 23% (190/825) reported microbiological outcomes. Quality did not improve over time. IMPLICATIONS: Overall quality of antimicrobial stewardship studies is low and has not improved over time. Most studies do not report clinical and microbiological outcome data. Studies conducted in the community setting were associated with better quality. These limitations should inform the design of future stewardship evaluations so that a robust evidence base can be built to guide clinical practice.


Asunto(s)
Antibacterianos/uso terapéutico , Programas de Optimización del Uso de los Antimicrobianos , Infecciones Comunitarias Adquiridas/tratamiento farmacológico , Infección Hospitalaria/tratamiento farmacológico , Investigación sobre Servicios de Salud/métodos , Proyectos de Investigación/estadística & datos numéricos , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Niño , Preescolar , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Adulto Joven
12.
Food Funct ; 9(12): 6566-6576, 2018 Dec 13.
Artículo en Inglés | MEDLINE | ID: mdl-30488063

RESUMEN

Human milk (HM) is the exclusive food during the first 4-6 months of an infant's life. Breastfeeding has been related to significant health benefits for infants, and hence it is of interest to study the bioactive compounds present in HM, such as sterols (cholesterol being the most abundant). The aim of this study was to determine the contents of sterols (cholesterol, desmosterol, lathosterol, lanosterol, campesterol, stigmasterol and ß-sitosterol) in 10 pools of colostrum, transitional milk, and 1, 3 and 6 month HM obtained from Spanish volunteers from two different geographical areas (coastal and central) and to estimate the intake and bioaccessibility (BA) of sterols in order to ascertain the fate of sterols after digestion. The results showed that the total sterol contents decreased to half the initial level during lactation (24-11 mg per 100 mL) and was significantly higher in samples from the coastal area. Total and animal sterol intakes were between 200 and 400 times higher than plant sterol intakes and were significantly higher in samples from the coastal area. However, no statistically significant differences were found in cholesterol and plant sterol intakes between areas. The BA of total sterols ranged from 45% to 69% and was higher in the first month, which coinciding with the highest fat content of milk. In conclusion, the sterol content varies depending on the lactation stage and the geographical area, and the BA of sterols can be positively affected by a higher lipid content. All these data may contribute to the development of infant formulas that are more similar to HM in terms of composition and behaviour after digestion, according to the lactation stage involved.


Asunto(s)
Leche Humana/química , Esteroles/análisis , Adolescente , Adulto , Lactancia Materna , Colesterol/análisis , Colesterol/metabolismo , Calostro/química , Calostro/metabolismo , Femenino , Humanos , Lactante , Lactancia , Leche Humana/metabolismo , Embarazo , Esteroles/metabolismo , Adulto Joven
13.
J Agric Food Chem ; 66(25): 6373-6381, 2018 Jun 27.
Artículo en Inglés | MEDLINE | ID: mdl-29856218

RESUMEN

This study validates a gas chromatography (GC) method for determining the sterol profile of human milk (HM) and compares it with an enzymatic-spectrophotometric (E-S) method. Good linearity ( r > 0.97) and low limits of detection and quantification were obtained with the GC method (<1.8 and <6 µg/100 g of HM, respectively). Suitable intra- and interassay precisions (all <18%) and satisfactory recovery percentages (80-109%) were obtained for both methods. In addition, both methodologies were used to assess cholesterol evolution in HM during lactation, showing a 50% decrease at 6 months versus colostrum. The E-S method overestimated cholesterol content by <20% versus the GC method. The results indicate that both methods may be used by the industry and in research to better understand the differences between the sterol profiles of infant formulas and HM.


Asunto(s)
Colesterol/química , Cromatografía de Gases/métodos , Leche Humana/química , Adolescente , Adulto , Catalasa/química , Colesterol/metabolismo , Calostro/química , Calostro/metabolismo , Femenino , Humanos , Lactancia , Leche Humana/metabolismo , Esteroles/química , Esteroles/metabolismo , Adulto Joven
14.
J Antimicrob Chemother ; 73(6): 1708-1713, 2018 06 01.
Artículo en Inglés | MEDLINE | ID: mdl-29506043

RESUMEN

Background: In 2016/2017, a financially linked antibiotic prescribing quality improvement initiative Commissioning for Quality and Innovation (AMR-CQUIN) was introduced across acute hospitals in England. This aimed for >1% reductions in DDDs/1000 admissions of total antibiotics, piperacillin/tazobactam and carbapenems compared with 2013/2014 and improved review of empirical antibiotic prescriptions. Objectives: To assess perceptions of staff leading antimicrobial stewardship activity regarding the AMR-CQUIN, the investments made by hospitals to achieve it and how these related to achieving reductions in antibiotic use. Methods: We invited antimicrobial stewardship leads at acute hospitals across England to complete a web-based survey. Antibiotic prescribing data were downloaded from the PHE Antimicrobial Resistance Local Indicators resource. Results: Responses were received from 116/155 (75%) acute hospitals. Owing to yearly increases in antibiotic use, most trusts needed to make >5% reductions in antibiotic consumption to achieve the AMR-CQUIN goal of 1% reduction. Additional funding was made available at 23/113 (20%) trusts and, in 18 (78%), this was <10% of the AMR-CQUIN value. Nationally, the annual trend for increased antibiotic use reversed in 2016/2017. In 2014/2015, year-on-year changes were +3.7% (IQR -0.8%, +8.4%), +9.4% (+0.2%, +19.5%) and +5.8% (-6.2%, +18.2%) for total antibiotics, piperacillin/tazobactam and carbapenems, respectively, and +0.1% (-5.4%, +4.0%), -4.8% (-16.9%, +3.2%) and -8.0% (-20.2%, +4.0%) in 2016/2017. Hospitals where staff believed they could reduce antibiotic use were more likely to do so (P < 0.001). Conclusions: Introducing the AMR-CQUIN was associated with a reduction in antibiotic use. For individual hospitals, achieving the AMR-CQUIN was associated with favourable perceptions of staff and not availability of funding.


Asunto(s)
Antibacterianos/administración & dosificación , Programas de Optimización del Uso de los Antimicrobianos/métodos , Hospitales , Motivación , Mejoramiento de la Calidad , Antibacterianos/uso terapéutico , Carbapenémicos/administración & dosificación , Prescripciones de Medicamentos/normas , Utilización de Medicamentos/normas , Hospitalización , Humanos , Programas Nacionales de Salud , Combinación Piperacilina y Tazobactam/administración & dosificación , Encuestas y Cuestionarios , Reino Unido
15.
J Agric Food Chem ; 66(6): 1377-1385, 2018 Feb 14.
Artículo en Inglés | MEDLINE | ID: mdl-29369630

RESUMEN

The design of infant formulas (IFs) seeks to resemble human milk (HM) composition and functionality. The fat sources used usually comprise vegetable oil blends to mimic the fatty acid composition of HM and introduce changes in the animal/plant sterol ratio. In contrast, the use of milk fat globule membrane (MFGM)-rich ingredients could improve this aspect by increasing the ratio. The present study evaluates the bioaccessibility (BA) of sterols (cholesterol, desmosterol, brassicasterol, campesterol, stigmasterol, and ß-sitosterol) in three IFs (with or without MFGM) using an in vitro digestion method simulating infant conditions. Analytical parameters confirmed the suitability of the method for all of these sterols. Results showed the presence of MFGM to increase cholesterol content (6-7 vs 2 mg/100 mL), this being the most bioaccessible sterol in the IFs. Although the BA of cholesterol was reduced in MFGM-enriched IF (65.6-80.4% vs 99.7%), the intake of bioaccessible cholesterol from these IFs was higher.


Asunto(s)
Fórmulas Infantiles/análisis , Esteroles/metabolismo , Digestión , Ácidos Grasos/análisis , Ácidos Grasos/metabolismo , Humanos , Fitosteroles/análisis , Fitosteroles/metabolismo , Esteroles/análisis
16.
Int J Food Sci Nutr ; 68(6): 695-703, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28276904

RESUMEN

Sterols are components present in the fat fraction of infant formulas (IFs). Their characterization is therefore of interest, though there are no official reference methods for their analysis in these matrices. AIM: To validate a gas chromatographic method with flame ionization detection for the determination of animal (cholesterol and desmosterol) and plant sterols (brassicasterol, campesterol, stigmasterol, ß-sitosterol and sitostanol) found in IFs. All correlation coefficients obtained for the calibration curves of sterols studied were >0.99. Limits of detection (<1 µg/100 mL) and quantification (<4 µg/100 mL) are suitable for sterols determination in IFs. The within-assay precision ranged from 1.6% to 8.8%, while the between-assay precision was <10% for most of sterols. Accuracy was satisfactory and was calculated by recovery assays (ranging 93-108%). The analytical parameters obtained showed the suitability of the proposed method for the determination of sterols in IFs.


Asunto(s)
Cromatografía de Gases , Fórmulas Infantiles/química , Fitosteroles/análisis , Calibración , Colestadienoles/análisis , Colesterol/análogos & derivados , Colesterol/análisis , Desmosterol/análisis , Ionización de Llama , Límite de Detección , Reproducibilidad de los Resultados , Sitoesteroles/análisis , Estigmasterol/análisis
17.
Clin Microbiol Infect ; 22(3): 244-51, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26577143

RESUMEN

Increasing antibiotic resistance makes choosing antibiotics for suspected Gram-negative infection challenging. This study set out to identify key determinants of mortality among patients with Gram-negative bacteraemia, focusing particularly on the importance of appropriate empiric antibiotic treatment. We conducted a prospective observational study of 679 unselected adults with Gram-negative bacteraemia at ten acute english hospitals between October 2013 and March 2014. Appropriate empiric antibiotic treatment was defined as intravenous treatment on the day of blood culture collection with an antibiotic to which the cultured organism was sensitive in vitro. Mortality analyses were adjusted for patient demographics, co-morbidities and illness severity. The majority of bacteraemias were community-onset (70%); most were caused by Escherichia coli (65%), Klebsiella spp. (15%) or Pseudomonas spp. (7%). Main foci of infection were urinary tract (51%), abdomen/biliary tract (20%) and lower respiratory tract (14%). The main antibiotics used were co-amoxiclav (32%) and piperacillin-tazobactam (30%) with 34% receiving combination therapy (predominantly aminoglycosides). Empiric treatment was inappropriate in 34%. All-cause mortality was 8% at 7 days and 15% at 30 days. Independent predictors of mortality (p <0.05) included older age, greater burden of co-morbid disease, severity of illness at presentation and inflammatory response. Inappropriate empiric antibiotic therapy was not associated with mortality at either time-point (adjusted OR 0.82; 95% CI 0.35-1.94 and adjusted OR 0.92; 95% CI 0.50-1.66, respectively). Although our study does not exclude an impact of empiric antibiotic choice on survival in Gram-negative bacteraemia, outcome is determined primarily by patient and disease factors.


Asunto(s)
Antibacterianos/uso terapéutico , Bacteriemia/tratamiento farmacológico , Bacteriemia/microbiología , Infecciones por Bacterias Gramnegativas/tratamiento farmacológico , Infecciones por Bacterias Gramnegativas/microbiología , Anciano , Anciano de 80 o más Años , Antibacterianos/farmacología , Bacteriemia/diagnóstico , Bacteriemia/mortalidad , Causas de Muerte , Comorbilidad , Inglaterra/epidemiología , Femenino , Infecciones por Bacterias Gramnegativas/diagnóstico , Infecciones por Bacterias Gramnegativas/mortalidad , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Factores de Riesgo , Resultado del Tratamiento
18.
S Afr J Surg ; 54(2): 15-19, 2016 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28240499

RESUMEN

BACKGROUND: The management of cervicomediastinal vascular trauma is challenging. We report on our experience with the condition in a newly established vascular trauma service unit, and compare the outcomes to those reported in our parent vascular surgery department. METHOD: The details of patients with cervicomediastinal vascular injuries from January 2012 to June 2014 were retrieved for analysis from a prospective database. RESULTS: Ninety-three patients were identified, 84 of whom were male (90%), with an average age of 29 years. Most were penetrating injuries (89%), and 87% of these were due to stab wounds. There were 107 vascular injuries, 88 cervical and 19 mediastinal. Of these, 87 were arterial and 20 venous injuries. The most common arterial injury involved the subclavian artery (24%), followed by the common carotid artery (22%). Management was multimodal, and included conservative (8%), stenting and embolisation (8%), referral to a higher centre (8%), vascular repair (64%) and ligation (12%). Nineteen per cent required median sternotomy or thoracotomy. Eight patients died postoperatively (9%). Seven of them presented in extremis and died within 24 hours, and one died after a week from associated abdominal injuries. Postoperative complications were 9%. There was no incidence of a stroke or limb loss despite ligation of the arteries, including ligation of four internal carotids. CONCLUSION: The development of endovascular techniques would allow for noninvasive management of a significant number of patients. Open surgery is still necessary, and associated with significant morbidity. Comparable results were reported in our newly established vascular trauma service unit to those obtained in our parent vascular surgery department in Durban.

19.
J Nanosci Nanotechnol ; 15(12): 9548-53, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26682377

RESUMEN

Here we report a simple and effective method in tailoring the optoelectronic properties of semi-conducting metal oxide for suitable device application. Sol-gel synthesis was used to synthesize manganese doped TiO2 nanopowder and commercially available TiO2 nanopowder was used as reference material. Thick films of these powder were screen printed on FTO coated glass and annealed at 450 degrees C in ambient air. Separately, 60 µL of neodymium chloride prepared from neodymium oxide, 60 µL of ruthenium based commercial dye (N719) and 60 µL of extracts of calendula orange and dog flower were used as sensitizer to improve the photoconductance properties. Elemental analysis confirmed synthesis of composite material of Mn and TiO2. Morphological observation showed a uniform particles of 25 to 50 nm diameter. Optoelectronic properties were studied by using thick films of these powders as working electrode as a function of wavelength from 430 to 750 nm and the cyclic voltammogram were obtained by scanning potential from -1.5 V to +1.5 V at the illumination intensity of 1000 Wm(-2). Sensitization resulted in additional absorption and functional bands. Oxidation peak current was found decreasing with increasing wavelength. Sensitization with flower extract resulted in increased oxidation current at higher wavelength indicating the improved photoconduction in comparison with N719 and neodymium.

20.
S Afr J Surg ; 53(1): 28-9, 2015 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26489110

RESUMEN

Isolated high-grade splenic injury following blunt abdominal trauma is an uncommon finding. The selected use of catheter-directed angiography and angioembolisation for splenic salvage has been successful in haemodynamically stable patients.


Asunto(s)
Traumatismos Abdominales/terapia , Embolización Terapéutica/métodos , Bazo/lesiones , Heridas no Penetrantes/terapia , Traumatismos Abdominales/diagnóstico por imagen , Angiografía , Humanos , Masculino , Heridas no Penetrantes/diagnóstico por imagen , Adulto Joven
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