Valorization of poly(lactic acid) wastes via mechanical recycling: Improvement of the properties of the recycled polymer.

Poly(lactic acid) (PLA) is a biobased polymer that represents one of the most interesting alternatives to fossil-fuel based polymers in food packaging applications. Most of the PLA used in food packaging is used only once and then discarded, even though the PLA types used in packaging have good properties and stability. Therefore, it seems reasonable to consider the possibility of recycling the used polymer through a mechanical recycling process. The main aims of this work are to study the effect of the mechanical recycling on the properties of PLA and the usefulness of different upgrading methods to obtain recycled PLA with improved properties. A commercial type of PLA was subjected to accelerated thermal, photochemical and hydrolytic aging and then reprocessed. During reprocessing, aged PLA was blended with virgin PLA and a commercial chain extender was added. Results point out that recycling causes the degradation of PLA, and negatively affects the thermal stability and mechanical properties. However, addition of virgin PLA, and the chain extender, led to an increase of up to 9% in the intrinsic viscosity and 8% in the Vickers hardness of the recycled material. These results suggest that mechanically recycled PLA with improved performance can be obtained, a fact which might improve the recyclability of PLA and thus the environmental impact of this material.

CCR-CARESS score for predicting operative mortality in patients with colorectal cancer.

BACKGROUND: The aim of this study was to assess factors associated with outcomes after surgery for colorectal cancer and to design and internally validate a simple score for predicting perioperative mortality. METHODS: Patients undergoing surgery for primary invasive colorectal cancer in 22 centres in Spain between June 2010 and December 2012 were included. Clinical variables up to 30 days were collected prospectively. Multiple logistic regression techniques were applied and a risk score was developed. The Hosmer-Lemeshow test was applied and the area under the receiver operating characteristic (ROC) curve (AUC, with 95 per cent c.i.) was estimated. RESULTS: A total of 2749 patients with a median age of 68·5 (range 24-97) years were included; the male : female ratio was approximately 2 : 1. Stage III tumours were diagnosed in 32·6 per cent and stage IV in 9·5 per cent. Open surgery was used in 39·3 per cent, and 3·6 per cent of interventions were urgent. Complications were most commonly infectious or surgical, and 25·5 per cent of patients had a transfusion during the hospital stay. The 30-day postoperative mortality rate was 1·9 (95 per cent c.i. 1·4 to 2·4) per cent. Predictive factors independently associated with mortality were: age 80 years or above (odds ratio (OR) 2·76), chronic obstructive pulmonary disease (COPD) (OR 3·62) and palliative surgery (OR 10·46). According to the categorical risk score, a patient aged 80 years or more, with COPD, and who underwent palliative surgery would have a 23·5 per cent risk of death within 30 days of the intervention. CONCLUSION: Elderly patients with co-morbidity and palliative intention of surgery have an unacceptably high risk of death.

Lipidomics signature in post-COVID patient sera and its influence on the prolonged inflammatory response.

BACKGROUND: The ongoing issues with post-COVID conditions (PCC), where symptoms persist long after the initial infection, highlight the need for research into blood lipid changes in these patients. While most studies focus on the acute phase of COVID-19, there's a significant lack of information on the lipidomic changes that occur in the later stages of the disease. Addressing this knowledge gap is critical for understanding the long-term effects of COVID-19 and could be key to developing personalized treatments for those suffering from PCC. METHODS: We employed untargeted lipidomics to analyze plasma samples from 147 PCC patients, assessing nearly 400 polar lipids. Data mining (DM) and machine learning (ML) tools were utilized to decode the results and ascertain significant lipidomic patterns. RESULTS: The study uncovered substantial changes in various lipid subclasses, presenting a detailed profile of the polar lipid fraction in PCC patients. These alterations correlated with ongoing inflammation and immune response. Notably, there were elevated levels of lysophosphatidylglycerols (LPGs) and phosphatidylethanolamines (PEs), and reduced levels of lysophosphatidylcholines (LPCs), suggesting these as potential lipid biomarkers for PCC. The lipidomic signatures indicated specific anionic lipid changes, implicating antimicrobial peptides (AMPs) in inflammation. Associations between particular medications and symptoms were also suggested. Classification models, such as multinomial regression (MR) and random forest (RF), successfully differentiated between symptomatic and asymptomatic PCC groups using lipidomic profiles. CONCLUSIONS: The study's groundbreaking discovery of specific lipidomic disruptions in PCC patients marks a significant stride in the quest to comprehend and combat this condition. The identified lipid biomarkers not only pave the way for novel diagnostic tools but also hold the promise to tailor individualized therapeutic strategies, potentially revolutionizing the clinical approach to managing PCC and improving patient care.

Anesthetic management of a combined heart and liver transplantation in an amyloidotic patient: a case report.

Few cases of combined heart and liver transplantation (CHLT) have been reported for familial amyloidosis. Our first CHLT was performed on a female patient with familial amyloidosis due to a genetic defect in transthyretin, characterized by deposition of amyloid in various organs and tissues. This disease produced autonomic heart dysfunction that preceded the development of clinical manifestations and may be an important factor in determining the optimal timing for liver transplantation. CHLT can be performed successfully, even in patients with advanced disease. However, the most compromised patients are more exposed to intraoperative risks, postoperative complications, and worsening of extracardiac and extrahepatic symptoms. Our patient presented severe cardiac dysfunction requiring CHLT. The operative technique is far from being consolidated, despite this, both organs were transplanted in the same day with 2 hours in the intensive care unit (ICU) between surgeries. The outcome of both organs has been favorable. The amyloidotic liver was transplanted to another patient, a sequential (domino) transplantation.

[Patient satisfaction with the process of computerisation, consent and decision making during hospitalisation]. / Satisfacción de los pacientes con el proceso de información, consentimiento y toma de decisiones durante la hospitalización.

UNLABELLED: The health organisations have moved from being centred on the professionals and are now centred on users and their expectations. The new health institutions want to know patients' perception of the quality of the care received, with particular respect to the information received, consent and decision making. It is necessary to have available measuring instruments that explore the different components of the process of information, consent and decision making. BACKGROUND: To identify the dimensions related to the process of information, consent and decision making of most importance to patients and susceptible to evaluation by questionnaire. SUBJECTS AND METHODS: Adult persons who have been hospitalised for at least two days. Qualitative study using semi-structured interviews. RESULTS: The participants wish to be informed and to participate in decision making; they do not know the meaning of the charter of patients' rights; they wish to share the whole care process with their family; written information is incomprehensible to them; and they feel that their pain and discomfort do not receive appropriate attention. CONCLUSION: It would be convenient to include the following dimensions in the questionnaires on satisfaction: a) the possibility of clarifying doubts; b) real knowledge of the rights and duties of patients; c) participation by the family in the care process; d) continuity of the same informer throughout hospitalisation; d) degree of understanding of the written information; e) involvement in decision making; and f) attention to pain and discomfort.

Complicaciones asociadas a la nutrición parenteral en los enfermos con infección por SARS-CoV-2 / Parenteral nutrition-associated complications in patients with SARS-CoV-2 infection

Introducción: se desconoce si los pacientes diagnosticados de infección respiratoria aguda por SARS-CoV-2 (COVID-19) presentan más riesgo de complicaciones asociadas a la nutrición parenteral (NP). Objetivo: conocer la incidencia, los factores de riesgo y la mortalidad de las complicaciones asociadas a la NP en esta población. Métodos: estudio de cohortes prospectivo de 87 pacientes diagnosticados de infección por SARS-CoV-2. Se analizan la tasa de incidencia de las complicaciones y las odds ratio (OR) de diferentes factores. Resultados: la edad ≥ 65 años (OR: 2,52, IC 95 %: 1,16 a 5,46), los antecedentes de obesidad (OR: 3,34, IC 95 %: 2,35 a 4,33) y el tratamiento con propofol (OR: 2,45, IC 95 %: 1,55 a 3,35) o lopinavir/ritonavir (OR: 4,98, IC 95 %: 3,60 a 6,29) se asociaron al desarrollo de hipertrigliceridemia. Los pacientes con obesidad (OR: 3,11, IC 95 %: 1,10 a 8,75) o dislipemia (OR: 3,22, IC 95 %: 1,23 a 8,40) y los tratados con propofol (OR: 5,47, IC 95 %: 1,97 a 15,1) presentaron mayor riesgo de infección asociada al catéter (IAC). No se observó ningún factor de riesgo relacionado con el desarrollo de hiperglucemia. La mortalidad fue mayor en los pacientes con IAC (46,7 % vs. 10,8 %, p = 0,014). El riesgo de mortalidad fue superior en los enfermos de ≥ 65 años (OR: 2,74, IC 95 %: 1,08 a 6,95) o con IAC (OR: 3,22, IC 95 %: 1,23 a 8,40). Conclusiones: la incidencia de complicaciones asociadas a la NP en pacientes diagnosticados de infección por SARS-CoV-2 es elevada. El riesgo de mortalidad es superior en los enfermos mayores de 65 años o con IAC (AU)

Background: it is unknown whether patients with acute respiratory distress syndrome (ARDS) secondary to COVID-19 are at greater risk of developing complications associated with parenteral nutrition (PN). Aim: to describe the incidence, risk factors, and clinical impact of complications in patients with ARDS-COVID-19 receiving PN. Methods: a prospective cohort study of 87 patients with ARDS-COVID-19 infection. The incidence of complications and odds ratios of risk factors were analysed. Results: age ≥ 65 years (OR, 2.52, 95 % CI: 1.16 to 5.46), obesity (OR, 3.34, 95 % CI: 2.35 to 4.33) and treatment with propofol (OR, 2.45, 95 % CI: 1.55 to 3.35) or lopinavir/ritonavir (OR, 4.98, 95 % CI: 3.60 to 6.29) were risk factors for hipertriglyceridemia. Obesity (OR, 3.11, 95 % CI: 1.10 to 8.75), dyslipidemia (OR, 3.22, 95 % CI: 1.23 to 8.40) or treatment with propofol (OR, 5.47, 95 % CI: 1.97 to 15.1) were risk factors for intravascular catheter-related infection. No risk factors were described for hiperglycemia. Mortality was higher in patients with intravascular catheter-related infection (46.7 % vs 10.8 %, p = 0.014). Mortality risk was higher in older patients (OR, 2.74, 95 % CI: 1.08 to 6.95) or patients with intravascular catheter-related infection (OR, 3.22, 95 % CI: 1.23 to 8.40). Conclusions: the incidence of complications associated with PN in patients with COVID-19-related ARDS is frequent. The mortality risk is higher in older patients or those with catheter-related infection (AU)

Aircraft and road traffic noise and children's cognition and health: a cross-national study.

BACKGROUND: Exposure to environmental stressors can impair children's health and their cognitive development. The effects of air pollution, lead, and chemicals have been studied, but there has been less emphasis on the effects of noise. Our aim, therefore, was to assess the effect of exposure to aircraft and road traffic noise on cognitive performance and health in children. METHODS: We did a cross-national, cross-sectional study in which we assessed 2844 of 3207 children aged 9-10 years who were attending 89 schools of 77 approached in the Netherlands, 27 in Spain, and 30 in the UK located in local authority areas around three major airports. We selected children by extent of exposure to external aircraft and road traffic noise at school as predicted from noise contour maps, modelling, and on-site measurements, and matched schools within countries for socioeconomic status. We measured cognitive and health outcomes with standardised tests and questionnaires administered in the classroom. We also used a questionnaire to obtain information from parents about socioeconomic status, their education, and ethnic origin. FINDINGS: We identified linear exposure-effect associations between exposure to chronic aircraft noise and impairment of reading comprehension (p=0.0097) and recognition memory (p=0.0141), and a non-linear association with annoyance (p<0.0001) maintained after adjustment for mother's education, socioeconomic status, longstanding illness, and extent of classroom insulation against noise. Exposure to road traffic noise was linearly associated with increases in episodic memory (conceptual recall: p=0.0066; information recall: p=0.0489), but also with annoyance (p=0.0047). Neither aircraft noise nor traffic noise affected sustained attention, self-reported health, or overall mental health. INTERPRETATION: Our findings indicate that a chronic environmental stressor-aircraft noise-could impair cognitive development in children, specifically reading comprehension. Schools exposed to high levels of aircraft noise are not healthy educational environments.

[Nursing ethics and new challenges]. / Etica de enfermería y nuevos retos.

The nursing profession has always placed great importance on the ethical requirements linked to its activities. However, the understanding and content to these activities has evolved over the course of history. Two approaches have been developed as the principal issues of nursing ethics: the ethics of virtue and the ethics of principles. The first approach enquires into the attitudes that must be held by a person in order to act as a good nurse. The second follows an inverse course and considers the actions and principles that must be respected in order to be a good professional. An approach that harmonises both perspectives must pose the following questions: What do we understand by nursing care? On what ethical principles is this form of understanding care based? What moral attitudes are related to caring correctly? In a modern professional model, the definition and exercise of care necessarily include consideration of team work. Similarly, carrying out a good caring function, that is to say quality nursing, requires apprenticeship on the one hand, and, on the other, the assimilation of the attitudes that are required in a person involved in caring. Both elements improve the capacity of the professionals to prevent and resolve ethical conflicts in the practice of care.

A randomized controlled trial of a 10 week group psychotherapeutic treatment added to standard medical treatment in patients with functional dyspepsia.

OBJECTIVE: Epidemiological evidence suggests an association between psychological factors and functional dyspepsia (FD). Yet few randomized controlled trials (RCTs) of psychological interventions have been conducted for FD. We conducted an RCT to evaluate the efficacy of psychotherapy among chronic FD. METHODS: One hundred fifty-eight consecutive patients with FD were randomized to medical therapy plus psychotherapy consisted in 8 group and 2 individual sessions focused on teaching techniques for coping with FD (intensive treatment (IT); n=76) or medical therapy alone (conventional treatment (CT); n=82). Patients completed validated self-reported questionnaires before and after the 10-week treatment and 6 months later. Linear mixed-effects models were used, in intention-to-treat analysis. RESULTS: At the end of treatment period, statistically significant improvements were observed for IT compared with CT for dyspepsia-related quality of life (DRQoL). DRQoL mean changes of 6.09 and 3.54 were obtained in IT and CT patients, respectively (p=<0.0001); and SS mean changes of 11.55 and 4.57 were obtained in IT and CT patients, respectively (p=0.0013). Those improvements, measured by minimum clinically important difference (MCID), were clinically significant (DRQoL: 77% of the IT patients exceeded the MCID vs. the 45% of the CT; SS: 75% vs. 48%). Six months after treatment, those statistically significant improvements persisted for DRQoL (p=0.0067) and for SS (p=0.0405). Clinical improvements persisted for SS (63% vs. 41%). CONCLUSIONS: These findings suggest that adding psychotherapy to standard medical therapy improves short-term outcomes in patients with FD and may have long-term effects as well. The cost-effectiveness of intensive therapy needs to be evaluated. Registration number and name of trial registry: NCT01802710.

Predictors of hospital admission in exacerbations of chronic obstructive pulmonary disease.

OBJECTIVE: To identify factors predictive of hospital admission among patients attending an emergency department (ED) with exacerbation of chronic obstructive pulmonary disease (COPD) and to determine if these were consistent with Global Initiative for Chronic Obstructive Lung Disease (GOLD) recommendations. DESIGN: In a prospective cohort of 2487 COPD patients with exacerbations conducted in 16 EDs, clinical data were obtained and physical examination and blood gas analyses were performed on arrival at the ED and at decision time about hospitalisation. Multivariate analyses were performed using hospital admission as the dependent measure. RESULTS: In multivariate analysis, factors predictive of hospital admission on ED arrival were previous hospitalisation for COPD exacerbation (OR 2.03, 95%CI 1.32-3.11), resting dyspnoea (OR 3.05, 95%CI 2.39-3.88) and altered blood gas (PaO2 = 45-60 mmHg, OR 2.7, 95%CI 2.12-3.44; PaO2 < 45 mmHg, OR 3.24, 95%CI 2.14-4.92; PaCO2 = 56-65 mmHg, OR 2.35, 95%CI 1.58-3.51; and PaCO2 > 65 mmHg, OR 6.98, 95%CI 4.03-12.09). The predictive capacity of the model using variables available at decision time was better than for those at ED arrival (area under the receiver operating characteristic curve 0.89 and 0.83). These factors are included in the GOLD recommendations. CONCLUSION: Among COPD patients presenting to the ED with exacerbation, factors immediately associated with episode severity were independent predictors of hospitalisation. Our criteria for hospitalisation are in line with GOLD recommendations.

VEGF reverts the cognitive impairment induced by a focal traumatic brain injury during the development of rats raised under environmental enrichment.

The role of VEGF in the nervous system is extensive; apart from its angiogenic effect, VEGF has been described as a neuroprotective, neurotrophic and neurogenic molecule. Similar effects have been described for enriched environment (EE). Moreover, both VEGF and EE have been related to improved spatial memory. Our aim was to investigate the neurovascular and cognitive effects of intracerebrally-administered VEGF and enriched environment during the critical period of the rat visual cortex development. Results showed that VEGF infusion as well as enriched environment induced neurovascular and cognitive effects in developing rats. VEGF administration produced an enhancement during the learning process of enriched animals and acted as an angiogenic factor both in primary visual cortex (V1) and dentate gyrus (DG) in order to counteract minipump implantation-induced damage. This fact revealed that DG vascularization is critical for normal learning. In contrast to this enriched environment acted on the neuronal density of the DG and V1 cortex, and results showed learning enhancement only in non-operated rats. In conclusion, VEGF administration only has effects if damage is observed due to injury. Once control values were reached, no further effects appeared, showing a ceiling effect. Our results strongly support that in addition to neurogenesis, vascularization plays a pivotal role for learning and memory.

The value of an immune response to Mycobacterium tuberculosis in patients with chronic posterior uveitis revisited: utility of the new IGRAs.

PURPOSE: To explore the utility of a specific immune response to Mycobacterium tuberculosis in a population of immunosuppressed idiopathic chronic posterior uveitis patients, by means of a tuberculosis-specific interferon-gamma release assay. DESIGN: Prospective, interventional case series. METHODS: A total of 31 referred patients with severe idiopathic chronic uveitis or panuveitis and 52 controls were screened for a specific immune response to tuberculosis. After ruling-out specific uveitis entities, presumed tuberculosis-related uveitis was initially considered when ophthalmologic findings were consistent with tubercular uveitis, and a specific immune response to M. tuberculosis confirmed by QuantiFERON, despite inability to detect M. tuberculosis. Clinical responses to antitubercular treatment were recorded. RESULTS: The prevalence of an immune response to M. tuberculosis was 15.38% in controls and 32.25% in uveitis patients (OR=2.619, P=0.07). Two patients were QuantiFERON indeterminate (6.4%). After excluding seven specific uveitis entities (OR=3.66, P=0.03), eight QuantiFERON-positive and one QuanTIFERON-negative uveitis patients were initially treated for presumed tuberculosis-related uveitis. All but one had no evidence of active systemic involvement. None had been previously diagnosed with tuberculosis, but unsuccessfully treated with immunosuppressors. After a 9-month tuberculostatic treatment, seven QuantiFERON -positive and one QuantiFERON-negative patients exhibited decreased intraocular inflammation, visual acuity improvement, and no relapses. Estimated QuantiFERON sensitivity and specificity were 82 and 100%, respectively, with a PPV=100% and an NPV=86%. CONCLUSIONS: QuantiFERON was useful for antituberculous treatment decision-making in chronic posterior uveitis immunosuppressed patients from areas with an intermediate-high prevalence of tuberculosis.