Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Resultados 1 - 20 de 72
Filtrar
1.
Pediatr Crit Care Med ; 25(5): e232-e238, 2024 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-38695702

RESUMEN

OBJECTIVES: Ethanol lock therapy (ELT) is a potential method of central catheter salvage following central line-associated bloodstream infection (CLABSI) although there is potential risk of catheter damage in polyurethane catheters. Further, there is limited efficacy data across the spectrum of common pediatric catheters, and published ELT protocols describe dwell times that are not feasible for critically ill children. We sought to evaluate the safety and efficacy of ELT in polyurethane catheters using brief (30 min to 2 hr) dwell times in our PICU. DESIGN: Investigational pilot study using historical control data. SETTING: PICU in quaternary care, free-standing children's hospital. INTERVENTIONS: ELT in polyurethane central venous catheters for catheter salvage. RESULTS: ELT with brief dwell times was used in 25 patients, 22 of whom were bacteremic. Ultimately 11 patients, comprising 14 catheters, were diagnosed with a primary CLABSI. The catheter salvage rate in primary CLABSI patients receiving ELT was 92% (13/14) and significantly higher than the salvage rate in patients receiving antibiotics alone (non-ELT) (62%, 39/64; mean difference 0.32, 95% CI [0.14-0.50], p = 0.03). The rate of catheter fracture in all patients receiving ELT was 8% (2/25) while the rate of fracture in the non-ELT group was 13% (8/64; mean difference -0.05, 95% CI [-0.18 to 0.09], p = 0.72). The rate of tissue plasminogen activator (tPA) use in the ELT group was 8% (2/25), whereas the rate of tPA use in the non-ELT group was significantly higher at 42% (26/64; mean difference -0.34, 95% CI [-0.49 to -0.17], p = 0.002). CONCLUSIONS: The use of ELT for catheter salvage and prophylaxis in the PICU is safe in a variety of polyurethane catheters. Dwell times ranging from 30 minutes to 2 hours were effective in sterilizing the catheters while allowing other therapies to continue. This approach may decrease the need for frequent line changes in a medically fragile pediatric population.


Asunto(s)
Infecciones Relacionadas con Catéteres , Cateterismo Venoso Central , Catéteres Venosos Centrales , Etanol , Unidades de Cuidado Intensivo Pediátrico , Poliuretanos , Humanos , Infecciones Relacionadas con Catéteres/prevención & control , Niño , Proyectos Piloto , Etanol/administración & dosificación , Masculino , Preescolar , Femenino , Lactante , Cateterismo Venoso Central/efectos adversos , Cateterismo Venoso Central/instrumentación , Catéteres Venosos Centrales/efectos adversos , Catéteres de Permanencia/efectos adversos , Adolescente , Bacteriemia/prevención & control , Bacteriemia/etiología , Antiinfecciosos Locales/administración & dosificación , Antiinfecciosos Locales/uso terapéutico
2.
Mem Cognit ; 52(4): 984-997, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38238501

RESUMEN

Mind wandering is a common occurrence that can have serious consequences, but estimating when mind wandering occurs is a challenging research question. Previous research has shown that during meditation, people may spontaneously alternate between task-oriented and mind-wandering states without awareness (Zukosky & Wang, 2021, Cognition, 212, Article 104689). However, under what conditions such alternations occur is not clear. The present study examined the effects of task type on spontaneous alternations between task focus and mind wandering. In addition to a meditation task, participants performed either a scene-categorization-based CPT or a visual detection task while attentional orientation was assessed via self-monitoring and intermittent probes. The three tasks differ in the extent of their reliance on continuous monitoring (less required in the detection than meditation and CPT tasks) and attentional orientation (oriented internally in meditation task and externally in CPT and detection tasks). To overcome prior methodological challenges, we applied a technique designed to detect spontaneous alternations between focused and mind-wandering states without awareness, based on how the proportion of "focused" responses/ratings to intermittent probes changes during a focus-to-mind-wandering interval (i.e., the period from one self-report of mind wandering to the subsequent self-report). Our results showed that the proportion of "focused" responses to intermittent probes remained constant with increasing interprobe interval during meditation (consistent with previous work), but declined significantly in the CPT and detection tasks. These findings support the hypothesis that spontaneous alternations of attentional states without self-awareness occur during tasks emphasizing internally but not externally oriented attention.


Asunto(s)
Atención , Meditación , Humanos , Atención/fisiología , Adulto , Adulto Joven , Masculino , Femenino , Pensamiento/fisiología , Desempeño Psicomotor/fisiología
3.
J Am Chem Soc ; 145(14): 8248-8260, 2023 04 12.
Artículo en Inglés | MEDLINE | ID: mdl-37011039

RESUMEN

Detection of metabolic activity enables us to reveal the inherent metabolic state of cells and elucidate mechanisms underlying cellular homeostasis and growth. However, a fluorescence approach for the study of metabolic pathways is still largely unexplored. Herein, we have developed a new chemical probe for the fluorescence-based detection of fatty acid ß-oxidation (FAO), a key process in lipid catabolism, in cells and tissues. This probe serves as a substrate of FAO and forms a reactive quinone methide (QM) as a result of metabolic reactions. The liberated QM is covalently captured by intracellular proteins, and subsequent bio-orthogonal ligation with a fluorophore enables fluorescence analysis. This reaction-based sensing allowed us to detect FAO activity in cells at a desired emission wavelength using diverse analytical techniques including fluorescence imaging, in-gel fluorescence activity-based protein profiling (ABPP), and fluorescence-activated cell sorting (FACS). The probe was able to detect changes in FAO activity induced by chemical modulators in cultured cells. The probe was further employed for fluorescence imaging of FAO in mouse liver tissues and revealed the metabolic heterogeneity of FAO activity in hepatocytes by the combination of FACS and gene expression analysis, highlighting the utility of our probe as a chemical tool for fatty acid metabolism research.


Asunto(s)
Ácidos Grasos , Hepatocitos , Ratones , Animales , Oxidación-Reducción , Fluorescencia , Hepatocitos/metabolismo , Ácidos Grasos/metabolismo
4.
Nature ; 549(7671): 211-218, 2017 09 13.
Artículo en Inglés | MEDLINE | ID: mdl-28905899

RESUMEN

As a result of the 1987 Montreal Protocol and its amendments, the atmospheric loading of anthropogenic ozone-depleting substances is decreasing. Accordingly, the stratospheric ozone layer is expected to recover. However, short data records and atmospheric variability confound the search for early signs of recovery, and climate change is masking ozone recovery from ozone-depleting substances in some regions and will increasingly affect the extent of recovery. Here we discuss the nature and timescales of ozone recovery, and explore the extent to which it can be currently detected in different atmospheric regions.

5.
Pediatr Crit Care Med ; 23(3): 192-200, 2022 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-34999641

RESUMEN

OBJECTIVES: The primary objective was to determine the prevalence and characteristics associated with malpositioned temporary, nontunneled central venous catheters (CVCs) placed via the internal jugular (IJ) and subclavian (SC) veins in pediatric patients. DESIGN: Single-center retrospective cohort study. SETTING: Quaternary academic PICU. PATIENTS: Children greater than 1 month to less than 18 years who had a CVC placed between January 2014 and December 2018. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: The primary outcome was the CVC tip position located on the first postprocedural radiograph. CVC tip was defined as follows: "recommended" (tip location between the carina and two vertebral bodies inferior to the carina), "high" (tip location between one and four vertebral bodies superior to the carina), "low" (tip position three or more vertebral bodies inferior to the carina), and "other" (tip grossly malpositioned). Seven hundred eighty-one CVCs were included: 481 (61.6%) were in "recommended" position, 157 (20.1%) were "high," 131 (16.8%) were "low," and 12 (1.5%) were "other." Multiple multinomial regression (referenced to "recommended" position) showed that left-sided catheters (adjusted odds ratio [aOR], 2.00, 95% CI 1.17-3.40) were associated with "high" CVC tip positions, whereas weight greater than or equal to 40 kg had decreased odds of having a "high" CVC tip compared with the reference (aOR, 0.45; 95% CI, 0.24-0.83). Further, weight category 20-40 kg (aOR, 2.42; 95% CI, 1.38-4.23) and females (aOR, 1.51; 95% CI, 1.01-2.26) were associated with "low" CVC tip positions. There was no difference in rates of central line-associated blood stream infection, venous thromboembolism, or tissue plasminogen activator usage or dose between the CVCs with tips outside and those within the recommended location. CONCLUSIONS: The prevalence of IJ and SC CVC tips outside of the recommended location was high. Left-sided catheters, patient weight, and sex were associated with malposition. Malpositioned catheters were not associated with increased harm.


Asunto(s)
Cateterismo Venoso Central , Catéteres Venosos Centrales , Cateterismo Venoso Central/efectos adversos , Catéteres Venosos Centrales/efectos adversos , Niño , Femenino , Humanos , Estudios Retrospectivos , Vena Subclavia , Activador de Tejido Plasminógeno
6.
J Health Commun ; 27(3): 201-207, 2022 03 04.
Artículo en Inglés | MEDLINE | ID: mdl-35467495

RESUMEN

The COVID-19 Public Education Media Campaign was initiated in July 2020 by the US Department of Health and Human Services (HHS). The process by which the Campaign was developed and operated by the HHS Office of the Assistant Secretary for Public Affairs (ASPA) was different than for other HHS campaigns. Nine learnings from recent ASPA systems change efforts were employed to guide development and implementation of the Campaign. The learnings, based in communication science as well as experience, have not been applied or have been inconsistently applied in other HHS campaigns. In this case, their application kept the Campaign's work focused on public health needs and not on political diversions. Separable from content and media aspects of the Campaign, the development and operational process guided by the nine learnings resulted in accomplishments such as: (1) advisory input and operation by a team of Federal employees from across the US Government; (2) award of large Federal contracts in a much shorter time than is typical, (3) proactive response to concerns from Congress, largely driven by the news media, (4) ability to make Campaign revisions in the context of the rapidly evolving science about the pandemic, and (5) ability to transcend the unusual political realities of a Presidential election season and the transition of administrations. Ways the nine learnings were applied to the Campaign's creation and operation may provide useful guidance to U.S. Government officials and others planning and conducting similar efforts in politically charged environments.


Asunto(s)
COVID-19 , COVID-19/epidemiología , COVID-19/prevención & control , Promoción de la Salud , Humanos , Medios de Comunicación de Masas , Política , Salud Pública
7.
Artículo en Inglés | MEDLINE | ID: mdl-35860194

RESUMEN

Selective bulk metal-organic frameworks (MOFs) have exhibited great potential in biomedical applications. However, topical treatments and drug elution coatings will require uniform films as drug delivery systems. This work studies the use of surface supportive MOF thin films for drug loading and releasing. More specifically, we focus on an iron-containing MOF, MIL-88B(Fe), on a COOH-terminated self-assembled monolayer (SAM) modified Au surface for encapsulating ibuprofen as a model drug. A combined experimental and computational approach was employed to study the fabrication of MIL-88B(Fe) film on functionalized Au surfaces. We used several surface characterization techniques, including infrared spectroscopy and scanning electron microscopy, to confirm the chemical composition and morphological changes of the surface after each modification step. The resulting MIL-88B(Fe) thin film was found capable of loading 8.7 wt% of ibuprofen using quartz crystal microbalance analysis. Moreover, we applied cluster simulations to study the binding mechanisms of MIL-88B(Fe) and its interactions with ibuprofen based on the density functional theory (DFT). The unsaturated Fe site was confirmed kinetically more favorable to bind to the COOH-end group on the SAM. Hydrogen bonding and π-CH interactions between ibuprofen and MIL-88B(Fe) promote ibuprofen being retained inside of the cages of MIL-88B(Fe).

8.
Pediatr Crit Care Med ; 22(3): 275-285, 2021 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-33534389

RESUMEN

OBJECTIVES: Left ventricular diastolic dysfunction is associated with difficulty in ventilator weaning and increased mortality in septic adults. We evaluated the association of left ventricular diastolic dysfunction with outcomes in a cohort of children with severe sepsis and septic shock. DESIGN: Retrospective cohort study. SETTING: Single-center noncardiac PICU. PATIENTS: Age greater than 1 month to less than 18 years old with severe sepsis or septic shock from January 2011 to June 2017 with echocardiogram within 48 hours of sepsis onset. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Echocardiograms were retrospectively assessed for mitral inflow E (early) and A (atrial) velocity and e' (early mitral annular motion) septal and lateral velocity. Left ventricular diastolic dysfunction was defined as E/e' greater than 10, E/A less than 0.8, or E/A greater than 1.5. Left ventricular diastolic dysfunction was present in 109 of 204 patients (53%). The data did not demonstrate an association between the presence of left ventricular diastolic dysfunction and the proportion of children requiring invasive mechanical ventilation at the time of echocardiogram (difference in proportion, +5% [72% vs 67%; 95% CI, -8% to 17%]; p = 0.52). The duration of mechanical ventilation was median 192.9 hours (interquartile range, 65.0-378.4 hr) in the left ventricular diastolic dysfunction group versus 151.0 hours (interquartile range, 45.7-244.3 hr) in the group without left ventricular diastolic dysfunction. The presence of left ventricular diastolic dysfunction was not significantly associated with ICU length of stay or mortality. Exploratory analyses revealed that an alternative definition of left ventricular diastolic dysfunction, solely defined by E/e' greater than 10, was found to have an association with mechanical ventilation requirement at the time of echocardiogram (difference in proportion, +15%; 95% CI, 3-28%; p = 0.02) and duration of mechanical ventilation (median, 207.3 vs 146.9 hr). CONCLUSIONS: The data failed to show an association between the presence of left ventricular diastolic dysfunction defined by both E/e' and E/A and the primary and secondary outcomes. When an alternative definition of left ventricular diastolic dysfunction with E/e' alone was used, there was a significant association with respiratory outcomes.


Asunto(s)
Sepsis , Choque Séptico , Disfunción Ventricular Izquierda , Adulto , Niño , Ecocardiografía , Humanos , Lactante , Estudios Retrospectivos , Disfunción Ventricular Izquierda/diagnóstico por imagen , Disfunción Ventricular Izquierda/etiología
9.
J Health Commun ; 25(10): 774-779, 2020 10 02.
Artículo en Inglés | MEDLINE | ID: mdl-33719885

RESUMEN

The US Department of Health and Human Services (HHS) has developed and is implementing an agency-wide Digital Communications Strategy. A robust strategy to coordinate digital communications is vital at times of crisis, such as the COVID-19 pandemic - and will be needed as part of an effective HHS campaign to motivate individuals who are hesitant to accept coronavirus vaccines. Using science-based principles of systems change, a four-phase approach was developed in alignment with the 21st Century Integrated Digital Experience Act (IDEA). Phase I involved announcing a plan for creating and implementing the HHS Digital Communications Strategy, including support for it from the HHS Secretary. Phase II involved gathering information and stakeholder support, with an interview research study as the central component for providing input and encouraging stakeholder engagement. Phase III focused on building the Strategy through an iterative process. Phase IV, which is ongoing, concentrates on implementing the Strategy, measuring the impact of digital communications and supporting the budget required to modernize Federal digital communications approaches to meet the American public's needs. Learnings from the work so far are consistent with those from prior HHS systems change efforts in communications - and are helping to improve the Strategy in real time.


Asunto(s)
COVID-19/prevención & control , Comunicación en Salud/métodos , United States Dept. of Health and Human Services/organización & administración , COVID-19/epidemiología , COVID-19/psicología , Humanos , Desarrollo de Programa , Estados Unidos
10.
Pediatr Crit Care Med ; 20(1): 71-78, 2019 01.
Artículo en Inglés | MEDLINE | ID: mdl-30234675

RESUMEN

OBJECTIVES: To create a bedside peripherally inserted central catheter service to increase placement of bedside peripherally inserted central catheter in PICU patients. DESIGN: Two-phase observational, pre-post design. SETTING: Single-center quaternary noncardiac PICU. PATIENTS: All patients admitted to the PICU. INTERVENTIONS: From June 1, 2015, to May 31, 2017, a bedside peripherally inserted central catheter service team was created (phase I) and expanded (phase II) as part of a quality improvement initiative. A multidisciplinary team developed a PICU peripherally inserted central catheter evaluation tool to identify amenable patients and to suggest location and provider for procedure performance. Outcome, process, and balancing metrics were evaluated. MEASUREMENTS AND MAIN RESULTS: Bedside peripherally inserted central catheter service placed 130 of 493 peripherally inserted central catheter (26%) resulting in 2,447 hospital central catheter days. A shift in bedside peripherally inserted central catheter centerline proportion occurred during both phases. Median time from order to catheter placement was reduced for peripherally inserted central catheters placed by bedside peripherally inserted central catheter service compared with placement in interventional radiology (6 hr [interquartile range, 2-23 hr] vs 34 hr [interquartile range, 19-61 hr]; p < 0.001). Successful access was achieved by bedside peripherally inserted central catheter service providers in 96% of patients with central tip position in 97%. Bedside peripherally inserted central catheter service central line-associated bloodstream infection and venous thromboembolism rates were similar to rates for peripherally inserted central catheters placed in interventional radiology (all central line-associated bloodstream infection, 1.23 vs 2.18; p = 0.37 and venous thromboembolism, 1.63 vs 1.57; p = 0.91). Peripherally inserted central catheters in PICU patients had reduced in-hospital venous thromboembolism rate compared with PICU temporary catheter in PICU rate (1.59 vs 5.36; p < 0.001). CONCLUSIONS: Bedside peripherally inserted central catheter service implementation increased bedside peripherally inserted central catheter placement and employed a patient-centered and timely process. Balancing metrics including central line-associated bloodstream infection and venous thromboembolism rates were not significantly different between peripherally inserted central catheters placed by bedside peripherally inserted central catheter service and those placed in interventional radiology.


Asunto(s)
Cateterismo Periférico/métodos , Unidades de Cuidado Intensivo Pediátrico/organización & administración , Sistemas de Atención de Punto/organización & administración , Adolescente , Infecciones Relacionadas con Catéteres/epidemiología , Niño , Preescolar , Femenino , Humanos , Masculino , Mejoramiento de la Calidad , Factores de Tiempo , Ultrasonografía Intervencional , Tromboembolia Venosa/epidemiología
11.
Sensors (Basel) ; 19(12)2019 Jun 17.
Artículo en Inglés | MEDLINE | ID: mdl-31213000

RESUMEN

The deployment of small unmanned aircraft systems (UAS) to collect routine in situ vertical profiles of the thermodynamic and kinematic state of the atmosphere in conjunction with other weather observations could significantly improve weather forecasting skill and resolution. High-resolution vertical measurements of pressure, temperature, humidity, wind speed and wind direction are critical to the understanding of atmospheric boundary layer processes integral to air-surface (land, ocean and sea ice) exchanges of energy, momentum, and moisture; how these are affected by climate variability; and how they impact weather forecasts and air quality simulations. We explore the potential value of collecting coordinated atmospheric profiles at fixed surface observing sites at designated times using instrumented UAS. We refer to such a network of autonomous weather UAS designed for atmospheric profiling and capable of operating in most weather conditions as a 3D Mesonet. We outline some of the fundamental and high-impact science questions and sampling needs driving the development of the 3D Mesonet and offer an overview of the general concept of operations. Preliminary measurements from profiling UAS are presented and we discuss how measurements from an operational network could be realized to better characterize the atmospheric boundary layer, improve weather forecasts, and help to identify threats of severe weather.

12.
J Health Commun ; 22(1): 29-36, 2017 01.
Artículo en Inglés | MEDLINE | ID: mdl-27967602

RESUMEN

Lesbian, gay, and bisexual (LGB) adults in the United States have a higher prevalence of smoking than their heterosexual counterparts. In 2013, the Los Angeles County Department of Public Health launched a social marketing and outreach campaign called Break Up to reduce the prevalence of smoking in LGB communities. Break Up was evaluated using cross-sectional, street-intercept surveys before and near the end of campaign. Surveys measured demographics, campaign awareness, and self-reported smoking-related outcomes. Bivariate statistics and logistic regression models were used to identify whether campaign awareness was associated with smoking-related outcomes. Calls by LGB persons to a smokers' helpline were also measured. Among those interviewed at endline, 32.7% reported Break Up awareness. Awareness was associated with thinking of quitting smoking and ever taking steps to quit but not with smoking cessation (defined as not smoking in the past 30 days among those who had smoked in the past 6 months). There was a 0.7% increase in the percentage of weekly calls by LGB persons to the helpline in the year after the campaign. Break Up reached about a third of its intended audience. The campaign was associated with smoking cessation precursors and may have led to an increase in helpline utilization, but there is no evidence it affected quit attempts. This study adds to the limited literature on tobacco programs for LGB persons and, as far as we know, is one of the first to evaluate tobacco-free social marketing in this important yet understudied population.


Asunto(s)
Educación en Salud , Promoción de la Salud , Minorías Sexuales y de Género/educación , Minorías Sexuales y de Género/psicología , Cese del Hábito de Fumar/estadística & datos numéricos , Prevención del Hábito de Fumar , Fumar/psicología , Adolescente , Adulto , Estudios Transversales , Femenino , Encuestas Epidemiológicas , Líneas Directas/estadística & datos numéricos , Humanos , Los Angeles/epidemiología , Masculino , Persona de Mediana Edad , Evaluación de Programas y Proyectos de Salud , Minorías Sexuales y de Género/estadística & datos numéricos , Fumar/epidemiología , Mercadeo Social , Adulto Joven
13.
Bioorg Med Chem Lett ; 25(21): 4941-4944, 2015 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-25987375

RESUMEN

Facilitating activation, or delaying inactivation, of the native Kv7 channel reduces neuronal excitability, which may be beneficial in controlling spontaneous electrical activity during epileptic seizures. In an effort to identify a compound with such properties, the structure-activity relationship (SAR) and in vitro ADME for a series of heterocyclic Kv7.2-7.5 channel openers was explored. PF-05020182 (2) demonstrated suitable properties for further testing in vivo where it dose-dependently decreased the number of animals exhibiting full tonic extension convulsions in response to corneal stimulation in the maximal electroshock (MES) assay. In addition, PF-05020182 (2) significantly inhibited convulsions in the MES assay at doses tested, consistent with in vitro activity measure. The physiochemical properties, in vitro and in vivo activities of PF-05020182 (2) support further development as an adjunctive treatment of refractory epilepsy.


Asunto(s)
Descubrimiento de Drogas , Epilepsia/tratamiento farmacológico , Activación del Canal Iónico/efectos de los fármacos , Canal de Potasio KCNQ2/metabolismo , Piperidinas/farmacología , Pirimidinas/farmacología , Animales , Línea Celular , Relación Dosis-Respuesta a Droga , Electrochoque , Humanos , Canal de Potasio KCNQ2/agonistas , Microsomas/efectos de los fármacos , Estructura Molecular , Piperidinas/administración & dosificación , Piperidinas/química , Pirimidinas/administración & dosificación , Pirimidinas/química , Ratas , Relación Estructura-Actividad
15.
Pediatr Crit Care Med ; 15(7): 649-52, 2014 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-24977438

RESUMEN

OBJECTIVE: To discuss pediatric intensivist-driven ultrasound and the exigent need for research and practice definitions pertaining to its implementation within pediatric critical care, specifically addressing issues in ultrasound-guided vascular access and intensivist-driven echocardiography. CONCLUSIONS: Intensivist-driven ultrasound improves procedure safety and reduces time to diagnosis in clinical ultrasound applications, as demonstrated primarily in adult patients. Translating these applications to the PICU requires thoughtful integration of the technology into practice and would best be informed by dedicated ultrasound research in critically ill children.


Asunto(s)
Cuidados Críticos , Ecocardiografía , Pediatría , Sistemas de Atención de Punto , Ultrasonografía Intervencional , Niño , Humanos
16.
J Pharmacol Exp Ther ; 347(1): 212-24, 2013 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-23899905

RESUMEN

α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) positive allosteric modulation (i.e., "potentiation") has been proposed to overcome cognitive impairments in schizophrenia, but AMPAR overstimulation can be excitotoxic. Thus, it is critical to define carefully a potentiator's mechanism-based therapeutic index (TI) and to determine confidently its translatability from rodents to higher-order species. Accordingly, the novel AMPAR potentiator N-{(3R,4S)-3-[4-(5-cyano-2-thienyl)phenyl]tetrahydro-2H-pyran-4-yl}propane-2-sulfonamide (PF-4778574) was characterized in a series of in vitro assays and single-dose animal studies evaluating AMPAR-mediated activities related to cognition and safety to afford an unbound brain compound concentration (Cb,u)-normalized interspecies exposure-response relationship. Because it is unknown which AMPAR subtype(s) may be selectively potentiated for an optimal TI, PF-4778574 binding affinity and functional potency were determined in rodent tissues expected to express a native mixture of AMPAR subunits and their associated proteins to afford composite pharmacological values. Functional activity was also quantified in recombinant cell lines stably expressing human GluA2 flip or flop homotetramers. Procognitive effects of PF-4778574 were evaluated in both rat electrophysiological and nonhuman primate (nhp) behavioral models of pharmacologically induced N-methyl-d-aspartate receptor hypofunction. Safety studies assessed cerebellum-based AMPAR activation (mouse) and motor coordination disruptions (mouse, dog, and nhp), as well as convulsion (mouse, rat, and dog). The resulting empirically derived exposure-response continuum for PF-4778574 defines a single-dose-based TI of 8- to 16-fold for self-limiting tremor, a readily monitorable clinical adverse event. Importantly, the Cb,u mediating each physiological effect were highly consistent across species, with efficacy and convulsion occurring at just fractions of the in vitro-derived pharmacological values.


Asunto(s)
Agonistas de Aminoácidos Excitadores/farmacología , Receptores AMPA/agonistas , Receptores AMPA/fisiología , Tiofenos/farmacología , Regulación Alostérica/efectos de los fármacos , Regulación Alostérica/fisiología , Animales , Células Cultivadas , Perros , Agonistas de Aminoácidos Excitadores/uso terapéutico , Femenino , Células HEK293 , Humanos , Macaca fascicularis , Masculino , Ratones , Ratones Endogámicos C57BL , Desempeño Psicomotor/efectos de los fármacos , Desempeño Psicomotor/fisiología , Distribución Aleatoria , Ratas , Ratas Sprague-Dawley , Convulsiones/fisiopatología , Convulsiones/prevención & control , Tiofenos/uso terapéutico , Resultado del Tratamiento
17.
Int J Sports Phys Ther ; 18(1): 173-187, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36793561

RESUMEN

Background: Dynamic balance is a vital aspect of everyday life. It is important to incorporate an exercise program that is useful for maintaining and improving balance in patients with chronic low back pain (CLBP). However, there is a lack of evidence supporting the effectiveness of spinal stabilization exercises (SSEs) on improving dynamic balance. Purpose: To determine the effectiveness of SSEs on dynamic balance in adults with CLBP. Study Design: A double-blind randomized clinical trial. Methods: Forty participants with CLBP were assigned randomly into either an SSE group or a general exercise (GE) group, which consisted of flexibility and range-of-motion exercises. Participants attended a total of four to eight supervised physical therapy (PT) sessions and performed their assigned exercises at home in the first four weeks of the eight-week intervention. In the last four weeks, the participants performed their exercises at home with no supervised PT sessions. Participants' dynamic balance was measured using the Y-Balance Test (YBT) and the normalized composite scores, Numeric Pain Rating Scale and Modified Oswestry Low Back Pain Disability Questionnaire scores were collected at baseline, two weeks, four weeks, and eight weeks. Results: A significant difference between groups from two weeks to four weeks (p = 0.002) was found, with the SSE group demonstrating higher YBT composite scores than the GE group. However, there were no significant between-group differences from baseline to two weeks (p =0.098), and from four weeks to eight weeks (p = 0.413). Conclusions: Supervised SSEs were superior to GEs in improving dynamic balance for the first four weeks after initiating intervention in adults with CLBP. However, GEs appeared to have an effect equivalent to that of SSEs after 8-week intervention. Levels of Evidence: 1b.

18.
Int J Sports Phys Ther ; 18(1): 169-172, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36793568

RESUMEN

Introduction: Low back pain (LBP) is a musculoskeletal disorder that affects more than 80% of people in the United States at least once in their lifetime. LBP is one of the most common complaints prompting individuals to seek medical care. The purpose of this study was to determine the effects of spinal stabilization exercises (SSEs) on movement performance, pain intensity, and disability level in adults with chronic low back pain (CLBP). Methods: Forty participants, 20 in each group, with CLBP were recruited and randomly allocated into one of two interventions: SSEs and general exercises (GEs). All participants received their assigned intervention under supervision one to two times per week for the first four weeks and then were asked to continue their program at home for another four weeks. Outcome measures were collected at baseline, two weeks, four weeks, and eight weeks, including the Functional Movement ScreenTM (FMSTM), Numeric Pain Rating Scale (NPRS), and Modified Oswestry Low Back Pain Disability Questionnaire (OSW) scores. Results: There was a significant interaction for the FMSTM scores (p = 0.016), but not for the NPRS and OSW scores. Post hoc analysis showed significant between-group differences between baseline and four weeks (p = 0.005) and between baseline and eight weeks (p = 0.026) favor SSEs over GEs. Further, the results demonstrated that all participants, regardless of group, had significant improvements in movement performance, pain intensity, and disability level over time. Conclusion: The results of the study favor SSEs over GEs in improving movement performance for individuals with CLBP, specifically after four weeks of the supervised SSE program.

19.
J Vasc Access ; : 11297298231199117, 2023 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-37731355

RESUMEN

BACKGROUND: Pediatric patients requiring extracorporeal life support (ECLS) often need central venous access for extended periods of time. In this population, the placement of an upper extremity peripherally inserted central catheter (PICC) can be challenging due to the location and size of the venous ECLS cannula. Bedside placement of a tunneled femorally inserted central catheters (T-FICC) can be a viable alternative to a traditional PICC. METHODS: In this case series we present five children who were on ECLS and had a T-FICC placed at the bedside. RESULTS: In this series of five patients we successfully placed T-FICCs while the patients were on ECLS. The T-FICCs dwelled from 15 to 182 days. There were no events of central line associated blood stream infections or deep vein thrombosis. There was only one unintentional line dislodgement noted. CONCLUSION: The use of T-FICCs placed at the bedside is a safe and reliable alternative for secure long-term venous access in children who are on ECLS.

20.
Crit Care Clin ; 39(2): 385-406, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-36898781

RESUMEN

Point-of-care ultrasound (POCUS) is now transitioning from an emerging technology to a standard of care for critically ill children. POCUS can provide immediate answers to clinical questions impacting management and outcomes within this fragile population. Recently published international guidelines specific to POCUS use in neonatal and pediatric critical care populations now complement previous Society of Critical Care Medicine guidelines. The authors review consensus statements within guidelines, identify important limitations to statements, and provide considerations for the successful implementation of POCUS in the pediatric critical care setting.


Asunto(s)
Cuidados Críticos , Sistemas de Atención de Punto , Recién Nacido , Niño , Humanos , Ultrasonografía
SELECCIÓN DE REFERENCIAS
Detalles de la búsqueda