Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 52
Filtrar
1.
Res Sq ; 2024 Apr 22.
Artículo en Inglés | MEDLINE | ID: mdl-38746205

RESUMEN

Background: Lung cancer screening (LCS) can reduce lung cancer mortality but has potential harms for patients. A shared decision-making (SDM) conversation about LCS is required by the Centers for Medicare & Medicaid Services (CMS) for LCS reimbursement. To overcome barriers to SDM in primary care, this protocol describes a telehealth decision coaching intervention for LCS in primary care clinics delivered by patient navigators. The objective of the study is to evaluate the effectiveness of the intervention and its implementation potential, compared with an enhanced usual care (EUC) arm. Methods: Patients (n = 420) of primary care clinicians (n = 120) are being recruited to a cluster randomized controlled trial. Clinicians are randomly assigned to 1) TELESCOPE intervention: prior to an upcoming non-acute clinic visit, patients participate in a telehealth decision coaching session about LCS delivered by trained patient navigators and nurse navigators place a low-dose CT scan (LDCT) order for each TELESCOPE patient wanting LCS, or 2) EUC: patients receive enhanced usual care from a clinician. Usual care is enhanced by providing clinicians in both arms with access to a Continuing Medical Education (CME) webinar about LCS and an LCS discussion guide. Patients complete surveys at baseline and 1-week after the scheduled clinic visit to assess quality of the SDM process. Re-navigation is attempted with TELESCOPE patients who have not completed the LDCT within 3 months. One month before being due for an annual screening, TELESCOPE patients whose initial LCS showed low-risk findings are randomly assigned to receive a telehealth decision coaching booster session with a navigator or no booster. Electronic health records are abstracted at 6, 12 and 18 months after the initial decision coaching session (TELESCOPE) or clinic visit (EUC) to assess initial and annual LCS uptake, imaging results, follow-up testing for abnormal findings, cancer diagnoses, treatment, and tobacco treatment referrals. This study will evaluate factors that facilitate or interfere with program implementation using mixed methods. Discussion: We will assess whether a decision coaching and patient navigation intervention can feasibly support high-quality SDM for LCS and guideline-concordant LCS uptake for patients in busy primary care practices serving diverse patient populations. Trial Registration: This study was registered at ClinicalTrials.gov (NCT05491213) on August 4, 2022.

2.
Liver Int ; 43(5): 1107-1119, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36737866

RESUMEN

BACKGROUND AND AIMS: Identifying international differences in utilization and outcomes of liver transplantation (LT) after donation after circulatory death (DCD) donation provides a unique opportunity for benchmarking and population-level insight. METHODS: Adult (≥18 years) LT data between 2008 and 2018 from the UK and US were used to assess mortality and graft failure after DCD LT. We used time-dependent Cox-regression methods to estimate hazard ratios (HR) for risk-adjusted short-term (0-90 days) and longer-term (90 days-5 years) outcomes. RESULTS: One-thousand five-hundred-and-sixty LT receipts from the UK and 3426 from the US were included. Over the study period, the use of DCD livers increased from 15.7% to 23.9% in the UK compared to 5.1% to 7.6% in the US. In the UK, DCD donors were older (UK:51 vs. US:33 years) with longer cold ischaemia time (UK: 437 vs. US: 333 min). Recipients in the US had higher Model for End-stage Liver Disease (MELD) scores, higher body mass index, higher proportions of ascites, encephalopathy, diabetes and previous abdominal surgeries. No difference in the risk-adjusted short-term mortality or graft failure was observed between the countries. In the longer-term (90 days-5 years), the UK had lower mortality and graft failure (adj.mortality HR:UK: 0.63 (95% CI: 0.49-0.80); graft failure HR: UK: 0.72, 95% CI: 0.58-0.91). The cumulative incidence of retransplantation was higher in the UK (5 years: UK: 11.9% vs. 4.6%; p < .001). CONCLUSIONS: For those receiving a DCD LT, longer-term post-transplant outcomes in the UK are superior to the US, however, significant differences in recipient illness, graft quality and access to retransplantation were seen between the two countries.


Asunto(s)
Enfermedad Hepática en Estado Terminal , Trasplante de Hígado , Obtención de Tejidos y Órganos , Adulto , Humanos , Enfermedad Hepática en Estado Terminal/cirugía , Índice de Severidad de la Enfermedad , Donantes de Tejidos , Reino Unido/epidemiología , Estudios Retrospectivos , Supervivencia de Injerto , Muerte Encefálica
3.
Transplantation ; 106(8): e358-e367, 2022 08 01.
Artículo en Inglés | MEDLINE | ID: mdl-35642976

RESUMEN

BACKGROUND: This study aimed to assess the differences between the United States and the United Kingdom in the characteristics and posttransplant survival of patients who received donation after circulatory death (DCD) liver allografts from donors aged >60 y. METHODS: Data were collected from the UK Transplant Registry and the United Network for Organ Sharing databases. Cohorts were dichotomized into donor age subgroups (donor >60 y [D >60]; donor ≤60 y [D ≤60]). Study period: January 1, 2001, to December 31, 2015. RESULTS: 1157 DCD LTs were performed in the United Kingdom versus 3394 in the United States. Only 13.8% of US DCD donors were aged >50 y, contrary to 44.3% in the United Kingdom. D >60 were 22.6% in the United Kingdom versus 2.4% in the United States. In the United Kingdom, 64.2% of D >60 clustered in 2 metropolitan centers. In the United States, there was marked inter-regional variation. A total of 78.3% of the US DCD allografts were used locally. One- and 5-y unadjusted DCD graft survival was higher in the United Kingdom versus the United States (87.3% versus 81.4%, and 78.0% versus 71.3%, respectively; P < 0.001). One- and 5-y D >60 graft survival was higher in the United Kingdom (87.3% versus 68.1%, and 77.9% versus 51.4%, United Kingdom versus United States, respectively; P < 0.001). In both groups, grafts from donors ≤30 y had the best survival. Survival was similar for donors aged 41 to 50 versus 51 to 60 in both cohorts. CONCLUSIONS: Compared with the United Kingdom, older DCD LT utilization remained low in the United States, with worse D >60 survival. Nonetheless, present data indicate similar survivals for older donors aged ≤60, supporting an extension to the current US DCD age cutoff.


Asunto(s)
Trasplante de Hígado , Obtención de Tejidos y Órganos , Aloinjertos , Muerte , Supervivencia de Injerto , Humanos , Hígado , Trasplante de Hígado/efectos adversos , Estudios Retrospectivos , Donantes de Tejidos , Resultado del Tratamiento , Reino Unido , Estados Unidos
4.
Cancers (Basel) ; 14(8)2022 Apr 07.
Artículo en Inglés | MEDLINE | ID: mdl-35454774

RESUMEN

Altered metabolism is a defining hallmark of cancer. Metabolic adaptations are often linked to a reprogramming of the mitochondria due to the importance of these organelles in energy production and biosynthesis. Cancer cells present heterogeneous metabolic phenotypes that can be modulated by signals originating from the tumor microenvironment. Extracellular vesicles (EVs) are recognized as key players in intercellular communications and mediate many of the hallmarks of cancer via the delivery of their diverse biological cargo molecules. Firstly, this review introduces the most characteristic changes that the EV-biogenesis machinery and mitochondria undergo in the context of cancer. Then, it focuses on the EV-driven processes which alter mitochondrial structure, composition, and function to provide a survival advantage to cancer cells in the context of the hallmarks of cancers, such as altered metabolic strategies, migration and invasiveness, immune surveillance escape, and evasion of apoptosis. Finally, it explores the as yet untapped potential of targeting mitochondria using EVs as delivery vectors as a promising cancer therapeutic strategy.

5.
Fam Syst Health ; 40(1): 126-131, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-35311326

RESUMEN

INTRODUCTION: The COVID-19 pandemic has impacted individuals across the world, and in particular, dramatically affected the experience of pregnancy and childbirth for many expectant mothers. The transition to parenthood is a time of increased risk for mental health problems, and maternal prenatal stress is associated with long-term maternal and infant health implications. The current study explored whether COVID-19 related changes to mothers' childbirth plans and prenatal health care experiences during the first wave of pandemic lockdowns in the U.S. were associated with self-reported depression, anxiety, and stress. METHOD: In spring 2020; we surveyed 641 pregnant women on their pregnancy and birth plans, as well as their mental health, during the COVID-19 pandemic. RESULTS: Women anticipating changes to the presence of their partner at birth also reported heightened symptoms of depression, anxiety, and stress. Additionally, women who anticipated changes to the timing of delivery reported both higher anxiety and higher perceived stress. DISCUSSION: These findings extend initial work suggesting increased risk for mental health problems in pregnant women during the COVID-19 pandemic by highlighting specific pandemic-related disruptions to pregnancy and birth that may have contributed to prenatal distress. Monitoring and intervention for these mothers and their infants are warranted. (PsycInfo Database Record (c) 2022 APA, all rights reserved).


Asunto(s)
COVID-19 , Pandemias , Ansiedad/etiología , Ansiedad/psicología , COVID-19/epidemiología , Control de Enfermedades Transmisibles , Femenino , Humanos , Lactante , Recién Nacido , Parto/psicología , Embarazo
6.
Transl Vis Sci Technol ; 11(3): 22, 2022 03 02.
Artículo en Inglés | MEDLINE | ID: mdl-35311930

RESUMEN

Purpose: Advanced driver assistance systems (ADAS) have been reported to improve the safety of elderly and normally sighted drivers. The purpose of this study was to assess exposure to, perceived safety of, comfort level with, and interest in using ADAS among drivers with age-related macular degeneration (AMD). Methods: Current drivers aged 60+ years were recruited at four US sites to complete a survey about ADAS and driving habits. Frequency of use and/or perceptions of eight ADAS were investigated. An avoidance score was generated using questions about difficult driving situations. Results: The survey was completed by 166 participants (80 with AMD vs. 86 without). Participants with AMD had worse self-rated vision than those without (34% vs. 2% poor or fair rating), and drove fewer weekly miles (median [interquartile range [IQR] 30 [15 to 75] vs. 60 [30 to 121] miles, P = 0.002). Participants with AMD reported more avoidance of difficult driving situations (P < 0.001). There was no difference in the number of ADAS used by AMD status (median [IQR for AMD = 2.5 [1 to 5] vs. 3 [2 to 4] without, P = 0.87). Greater reported number of ADAS used was associated with less avoidance of difficult situations (P = 0.02). The majority perceived improved safety with most ADAS. Conclusions: Many drivers with AMD utilize common ADAS, which subjectively improve their road safety and may help to reduce self-imposed restrictions for difficult situations and mileage. Translational Relevance: Drivers with AMD are adopting readily available ADAS, for which they reported potential benefits, such as safety and less restrictive driving.


Asunto(s)
Conducción de Automóvil , Degeneración Macular , Accidentes de Tránsito , Anciano , Humanos , Degeneración Macular/terapia , Encuestas y Cuestionarios
7.
HPB (Oxford) ; 24(5): 596-605, 2022 05.
Artículo en Inglés | MEDLINE | ID: mdl-34702624

RESUMEN

BACKGROUND: The Risk Estimation of Tumor Recurrence After Transplant (RETREAT) score as a prognostic index for recurrence has been reported previously and has not been validated outside the USA. Our study has validated the score in a single center UK cohort of patients being transplanted for HCC. METHODS: LT for HCC between 2008 and 2018 at our center were analyzed. Recurrence-free survival (RFS) was compared by the RETREAT score and validated using Net Reclassification Improvement (NRI) by comparing it to Milan criteria. RESULTS: 346 adult HCC patients were transplanted of whom 313 were included. 28 (8.9%) had a recurrence. Summation of largest diameter and total number of viable tumors (HR = 1.19, p < 0.001), micro-/macro-vascular invasion (HR = 3.74, p = 0.002) and AFP>20 ng/ml (HR = 3.03, p = 0.005) were associated with recurrence on multivariate analysis. RFS decreased with increasing RETREAT score (log-rank p = 0.016). RETREAT performed better than Milan with significant NRI at 1- and 2-years post-transplant (0.43 (p = 0.004) and 0.38 (p = 0.03) respectively). CONCLUSION: LT outcomes using the revised UK criteria are equivalent to Milan criteria. Further, RETREAT score was validated as a prognostic index for the first time in a UK cohort and may assist risk stratification, selection for adjuvant therapies and guide surveillance.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Trasplante de Hígado , Adulto , Humanos , Trasplante de Hígado/efectos adversos , Recurrencia Local de Neoplasia/patología , Pronóstico , Estudios Retrospectivos , Factores de Riesgo , Reino Unido , alfa-Fetoproteínas
10.
Sci Rep ; 11(1): 15285, 2021 07 27.
Artículo en Inglés | MEDLINE | ID: mdl-34315936

RESUMEN

This study examined how people choose their path to a target, and the visual information they use for path planning. Participants avoided stepping outside an avoidance margin between a stationary obstacle and the edge of a walkway as they walked to a bookcase and picked up a target from different locations on a shelf. We provided an integrated explanation for path selection by combining avoidance margin, deviation angle, and distance to the obstacle. We found that the combination of right and left avoidance margins accounted for 26%, deviation angle accounted for 39%, and distance to the obstacle accounted for 35% of the variability in decisions about the direction taken to circumvent an obstacle on the way to a target. Gaze analysis findings showed that participants directed their gaze to minimize the uncertainty involved in successful task performance and that gaze sequence changed with obstacle location. In some cases, participants chose to circumvent the obstacle on a side for which the gaze time was shorter, and the path was longer than for the opposite side. Our results of a path selection judgment test showed that the threshold for participants abandoning their preferred side for circumventing the obstacle was a target location of 15 cm to the left of the bookcase shelf center.

11.
Am J Transplant ; 21(6): 2200-2210, 2021 06.
Artículo en Inglés | MEDLINE | ID: mdl-33222386

RESUMEN

The aim of the study was to assess the UK donation after circulatory death (DCD) liver transplant experience from donors ≥70 years. Nationwide UK DCD retrospective analysis was conducted between 2001 and 2015 (n = 1163). Recipients were divided into group 1 vs. group 2 (donors 70≥ vs. <70 years, respectively). group 1 (n = 69, 5.9%) recipients were older (median 59 vs. 55 years, p = .001) and had longer waitlist time (128 vs. 84 days; p = .039). 94.2% of group 1 clustered in London and Birmingham, where the two busiest centers are located. group 1 allografts had higher UKDRI and UK DCD Risk Scores but similar WIT and CIT and were more likely to have been imported. Both groups had similar 1-, 3-, and 5-year graft survival (group 1, 90%, 81.4%, and 74% vs. group 2, 88.6%, 81.4%, and 78.6%, respectively; p = .54). Both groups had similar ICU stay length (p = .22), 3-month hepatic artery thrombosis rates (4.4% vs 4.0%; p = .9), and 12-month readmission rates for all biliary complications (20.3% vs 25.7%; p = .32). This study demonstrates that acceptable outcomes are achievable using older grafts in a highly selected cohort at experienced centers. Advanced age should not be an absolute contraindication to utilizing a DCD graft from donors aged ≥70 years.


Asunto(s)
Supervivencia de Injerto , Obtención de Tejidos y Órganos , Anciano , Muerte Encefálica , Muerte , Humanos , Hígado , Estudios Retrospectivos , Donantes de Tejidos , Reino Unido/epidemiología
12.
BMC Gastroenterol ; 20(1): 329, 2020 Oct 07.
Artículo en Inglés | MEDLINE | ID: mdl-33028218

RESUMEN

BACKGROUND: We report our experience of treating anastomotic strictures using a novel type of fully covered metal stent (FCSEMS). This stent, known as the Kaffes Stent, is short-length with an antimigration waist and is easily removable due to long retrieval wires deployed within the duodenum. METHODS: Sixty-two patients underwent ERCP and Kaffes stent insertion for post-transplant anastomotic strictures following confirmation of a stricture on MRCP. These patients were retrospectively analysed for immediate and long-term stricture resolution, improvement in symptoms and liver function tests (LFTs), stricture recurrence and complication rates. RESULTS: Of the 56 patients who had their stent removed at the time of analysis, 54 (96%) had immediate stricture resolution and 42 continued to have long-term resolution (mean follow-up period was 548 days). Of the 16 patients with symptoms of biliary obstruction, 13 had resolution of their symptoms. Overall, there was a significant improvement in LFTs after stent removal compared to before stent insertion. Complication rates were 15% with only one patient requiring biliary reconstruction. CONCLUSIONS: The Kaffes stent is effective and safe at resolving post liver transplant biliary anastomotic strictures.


Asunto(s)
Trasplante de Hígado , Colangiopancreatografia Retrógrada Endoscópica/efectos adversos , Constricción Patológica/etiología , Constricción Patológica/cirugía , Humanos , Trasplante de Hígado/efectos adversos , Estudios Retrospectivos , Stents , Resultado del Tratamiento
13.
Exp Brain Res ; 238(11): 2615-2623, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32918559

RESUMEN

Subjects' eye movement behavior related to cognitive effort during gait was measured as subjects walked to perform low and high cognitive load tasks. We found that all pupil diameter measures, fixation durations, and the proportion of blink duration changed significantly during gait as a function of task load. In contrast, the number of fixations, saccade durations and travel time did not change significantly as a function of task load. Findings showed that pupil diameter was the best predictor of task load during one's gait preceding the performance of the task. While other studies have demonstrated the importance of eye fixation characteristics during gait, our findings showed that eye measures related to pupil diameter were better at detecting cognitive load while walking to perform a task compared to eye fixation data. We also found that cognitive effort was not limited to just the performance of the task, but that it was also exerted during one's gait preceding the performance of the task. Therefore, the additional attention demand caused by an increase in task complexity may result in less attentional resources being available to adequately handle distractions (such as obstacle avoidance) while walking to perform the task. Consequently, this may increase the likelihood of falls in those individuals with lower attentional capacity.


Asunto(s)
Objetivos , Pupila , Atención , Biomarcadores , Cognición , Marcha , Humanos
14.
Exp Brain Res ; 238(11): 2433-2443, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32776171

RESUMEN

The purpose of this study was to determine the effect of hierarchical goal structure of a yet-to-be performed task on gait and eye fixation behavior while walking to the location of where the task was to be performed. Subjects performed different goal-directed tasks representing three hierarchical levels of planning. The first level of planning consisted of having the subject walk to a bookcase on which an object (a cup) was located in the middle of a shelf. The second level of planning consisted of walking to the bookcase and picking up the cup which was in the middle, on the right side, or on the left side of the bookcase shelf. The third level of planning consisted of walking to the bookcase, picking up the cup which was located in the middle of the bookcase shelf, and moving it to a higher shelf. Findings showed that hierarchal goals do affect center of mass velocity and eye fixation behavior. Center of mass velocity to the bookcase increased with an increase in the number of goals. Subjects decreased gait velocity as they approached the bookcase and adjusted their last steps to accommodate picking up the cup. The findings also demonstrated the important role of vision in controlling gait velocity in goal-directed tasks. Eye fixation duration was more important than the number of eye fixations in controlling gait velocity. Thus, the amount of information gained through object fixation duration is of greater importance than the number of fixations on the object for effective goal achievement.


Asunto(s)
Fijación Ocular , Objetivos , Marcha , Humanos
15.
Optom Vis Sci ; 97(6): 406-415, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32511162

RESUMEN

SIGNIFICANCE: This study explored whether people with AMD can accurately judge the time they need to cross the street. The results suggest that AMD-related vision loss does not affect a person's ability to estimate his/her own street-crossing time, whereas familiarity with the street does. PURPOSE: The purpose of this study was to assess whether people with AMD could judge accurately their street-crossing time. METHODS: Fifty-one AMD subjects and 47 age-matched normally sighted subjects (controls) estimated their time to cross a single-lane, one-way street four times (pre-estimate). Then, subjects actually crossed the street four times and subsequently estimated their crossing time four additional times (post-estimate). A linear mixed model with repeated measures for subject was used to determine if the ratio between subjects' estimated and actual crossing times changed as a function of subject group (AMD vs. control) and whether estimates changed before and after actually crossing the street. Univariate correlations and multiple regression analyses were also performed to determine which of the measured experimental variables were the best predictors of a subject's ability to estimate his/her crossing time. RESULTS: No significant difference in crossing ratios were found between the AMD (average, 1.05) and control (average, 1.16) subjects (P = .11). This was true for both the pre-crossing (AMD, 1.09; controls, 1.23; P = .11) and post-crossing ratios (AMD, 1.01; controls, 1.09; P = .17). Both subject groups' crossing ratios, however, decreased significantly going from pre to post (P < .0001). Increased age, longer actual crossing time, and experience gained from previously crossing the street resulted in less overestimation of one's crossing time. CONCLUSIONS: Our data suggest that familiarity with the street as opposed to central vision loss from AMD affects a person's ability to estimate his/her crossing time.


Asunto(s)
Degeneración Macular/fisiopatología , Desempeño Psicomotor/fisiología , Escotoma/fisiopatología , Baja Visión/fisiopatología , Caminata/fisiología , Accidentes de Tránsito/prevención & control , Anciano , Anciano de 80 o más Años , Sensibilidad de Contraste/fisiología , Femenino , Humanos , Juicio/fisiología , Masculino , Pruebas de Estado Mental y Demencia , Factores de Tiempo , Agudeza Visual/fisiología , Pruebas del Campo Visual , Campos Visuales/fisiología
16.
Clin Transplant ; 34(9): e13890, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32356404

RESUMEN

BACKGROUND: Acute kidney injury (AKI) after liver transplantation (LT) is a common problem with complex management. The aims were to analyze the profile of AKI-RIFLE categories in the post-transplant setting of a wide multicentre cohort of patients in the MELD era and to specifically determine the effect of tacrolimus-based (TACRO) immunosuppressive regimes on the development of AKI. METHODS: A retrospective analysis of 550 (2007-2012) consecutive patients transplanted at Reina Sofia, Cordoba, and King's College Hospital, London, was performed. Inclusion criterion was to have CNI as part of initial immunosuppression immediately after LT. RESULTS: After exclusion criteria, a total of 477 patients were analyzed. Incidence of AKI within the first 2 weeks after LT was 65.8% (AKI-Risk), 41.3% (AKI-Injury), and 12.3% (AKI-Failure). The development of any type of AKI had no impact on short- and/or long-term survival up to 3 years after the transplant. Moreover, AKI was almost universal in the early post-transplant period and TACRO trough concentrations during the first 2 weeks after the transplant were not predictors of AKI in none of its categories in the multivariate analyses. CONCLUSIONS: Low-TACRO-based regimes were not as useful as expected in the prevention of AKI when analyzed in the context of a large contemporary LT series.


Asunto(s)
Lesión Renal Aguda , Trasplante de Hígado , Lesión Renal Aguda/epidemiología , Lesión Renal Aguda/etiología , Humanos , Inmunosupresores/efectos adversos , Trasplante de Hígado/efectos adversos , Estudios Retrospectivos , Factores de Riesgo , Tacrolimus/efectos adversos
17.
Optom Vis Sci ; 97(4): 229-238, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-32304532

RESUMEN

SIGNIFICANCE: This study explored the street-crossing decision-making performance of young normally sighted subjects with simulated central field loss (CFL). The results suggest that using eccentric viewing enables a person to make safe and reliable street-crossing decisions. PURPOSE: This study tested the hypothesis that, as the diameter of an experimentally induced central scotoma increases, the accuracy and reliability of street-crossing decisions worsen. METHODS: Street-crossing decisions were measured in 20 young subjects aged between 23 and 31 years while monocularly viewing a nonsignalized, one-way street for different vehicular arrival times. Using a 5-point rating scale, subjects judged whether they could cross the street before vehicular arrival with habitual vision and simulated CFL with eccentric viewing. The CFL was induced using soft contact lenses with different central opaque diameters. Using receiver operating characteristic curve analysis, we obtained subjects' accuracy (amount of time in seconds where subjects either overestimated or underestimated vehicular arrival time relative to their actual crossing time) and reliability (how quickly subjects transitioned from judging insufficient to sufficient time to cross relative to their actual crossing time). RESULTS: The centrally opaque contact lenses induced central scotomata with a mean (standard deviation) diameter of 17.12° (5.83°). No significant difference in street-crossing accuracy (P = .35) or reliability (P = .09) was found between the normal, habitual vision and simulated CFL conditions. No statistically significant correlations were found between scotoma diameter and the accuracy and reliability of subjects' street-crossing decisions (P = .83 and P = .95, respectively). CONCLUSIONS: The findings of this study suggest that adopting eccentric viewing enables a person to successfully mitigate the negative effects of an absolute central scotoma on the accuracy and reliability of their street-crossing decisions.


Asunto(s)
Toma de Decisiones/fisiología , Peatones , Desempeño Psicomotor/fisiología , Escotoma/fisiopatología , Campos Visuales/fisiología , Caminata/fisiología , Accidentes de Tránsito , Adulto , Femenino , Humanos , Masculino , Curva ROC , Reproducibilidad de los Resultados , Adulto Joven
18.
Artículo en Inglés | MEDLINE | ID: mdl-32218306

RESUMEN

There is no consensus if electronic nicotine delivery systems (ENDS) should be used to reduce harm among the smoking population. Physicians, who represent a trusted source of health communication, are exposed to a range of often conflicting ENDS information and this information may be relayed to patients looking to quit smoking. Previous studies have examined ENDS content of various sources of media but there is a lack of knowledge about ENDS content in medical journals. We analyzed 421 ENDS publications printed between 2012 and 2018 from PubMed's Core Clinical Journal list. Publications were analyzed based on publication type, journal type, study design, geographic focus, theme, terminology, outcomes, and positive/negative statements. The number of ENDS publications grew since 2012, and peaked in 2015. Across all years, negative statements about ENDS outnumbered positive statements, though this difference decreased over time. Over time, negative statements about "toxins and carcinogens" were made less frequently, while negative statements about "gateway effects" and "youth appeal" became more prevalent. UK journals had fewer negative statements relative to US journals. Only 12.6% of publications included guidance for healthcare professionals about ENDS. As published ENDS topics change over time, physicians' communications with patients may be impacted.


Asunto(s)
Bibliometría , Sistemas Electrónicos de Liberación de Nicotina , Publicaciones Periódicas como Asunto , Humanos , Prevalencia , Fumar
19.
Stem Cells ; 38(3): 369-381, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-31778245

RESUMEN

Thyroid hormones are regarded as the major controllers of metabolic rate and oxygen consumption in mammals. Although it has been demonstrated that thyroid hormone supplementation improves bovine embryo development in vitro, the cellular mechanisms underlying these effects are so far unknown. In this study, we investigated the role of thyroid hormone in development of human preimplantation embryos. Embryos were cultured in the presence or absence of 10-7 M triiodothyronine (T3) till blastocyst stage. Inner cell mass (ICM) and trophectoderm (TE) were separated mechanically and subjected to RNAseq or quantification of mitochondrial DNA copy number. Analyses were performed using DESeq (v1.16.0 on R v3.1.3), MeV4.9 and MitoMiner 4.0v2018 JUN platforms. We found that the exposure of human preimplantation embryos to T3 had a profound impact on nuclear gene transcription only in the cells of ICM (1178 regulated genes-10.5% of 11 196 expressed genes) and almost no effect on cells of TE (38 regulated genes-0.3% of expressed genes). The analyses suggest that T3 induces in ICM a shift in ribosome and oxidative phosphorylation activity, as the upregulated genes are contributing to the composition and organization of the respiratory chain and associated cofactors involved in mitoribosome assembly and stability. Furthermore, a number of genes affecting the citric acid cycle energy production have reduced expression. Our findings might explain why thyroid disorders in women have been associated with reduced fertility and adverse pregnancy outcome. Our data also raise a possibility that supplementation of culture media with T3 may improve outcomes for women undergoing in vitro fertilization.


Asunto(s)
Blastocisto/metabolismo , Mitocondrias/metabolismo , Hormonas Tiroideas/metabolismo , Femenino , Humanos , Fosforilación Oxidativa , Embarazo
20.
Am J Clin Oncol ; 42(12): 918-923, 2019 12.
Artículo en Inglés | MEDLINE | ID: mdl-31436748

RESUMEN

OBJECTIVE: Hepatocellular carcinoma (HCC) is a complication of the common genetic condition hereditary hemochromatosis (HH). It is unknown whether HH as an etiology of liver disease impacts the outcome. We compared the results of liver transplantation (LT), surgical resection and locoregional therapies in a matched cohort study and investigated whether HH as an etiology has an impact on survival. MATERIALS AND METHODS: Consecutive patients with HH and HCC (2000 to 2015) were compared with age, sex and Barcelona Clinic Liver Cancer (BCLC) stage-matched non-HH HCC cases. Patients were offered curative or noncurative treatment according to BCLC stage and Milan criteria. The primary endpoint was all-cause mortality. RESULTS: A total of 102 patients (52 HH; total cohort median age: 67 [44 to 78] y, 97% male, Model for End-stage Liver Disease: 9 [5 to 31]) were studied with a median follow-up of 22 (3 to 126) months. Of the HH cases, the median serum ferritin at diagnosis of HCC was 326 (27 to 5718) µg/L and α-fetoprotein 33 (2 to 197,926) kIU/L. Five-year survival for HH patients receiving curative therapy was 77% (80% for LT, 67% for resection/radiofrequency ablation), and 15% (23% for transarterial chemoembolization) for those undergoing noncurative therapy. Survival for HH patients compared with controls was similar (hazard ratio=0.949; P=0.839). On multivariate Cox regression survival analysis, BCLC stage, and diagnosis of ischemic heart disease (but not HH diagnosis) were independently associated with reduced survival. CONCLUSIONS: Patients with HCC and HH can achieve comparable survival rates following curative or LRT modalities to other liver diseases. The BCLC staging system accurately stratifies survival and excellent 5-year survival is possible following LT in selected patients.


Asunto(s)
Carcinoma Hepatocelular/mortalidad , Causas de Muerte , Hemocromatosis/patología , Neoplasias Hepáticas/mortalidad , Lesiones Precancerosas/mortalidad , Adulto , Anciano , Carcinoma Hepatocelular/patología , Carcinoma Hepatocelular/cirugía , Estudios de Casos y Controles , Ablación por Catéter/métodos , Ablación por Catéter/mortalidad , Quimioembolización Terapéutica/métodos , Quimioembolización Terapéutica/mortalidad , Bases de Datos Factuales , Supervivencia sin Enfermedad , Femenino , Hemocromatosis/mortalidad , Hemocromatosis/terapia , Humanos , Estimación de Kaplan-Meier , Neoplasias Hepáticas/patología , Neoplasias Hepáticas/cirugía , Trasplante de Hígado/métodos , Trasplante de Hígado/mortalidad , Masculino , Persona de Mediana Edad , Análisis Multivariante , Lesiones Precancerosas/patología , Lesiones Precancerosas/terapia , Pronóstico , Modelos de Riesgos Proporcionales , Estudios Retrospectivos , Medición de Riesgo , España , Análisis de Supervivencia , Resultado del Tratamiento
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...