Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 21
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
J Pediatr Orthop ; 40(10): e910-e915, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32604348

RESUMEN

INTRODUCTION: The purpose of this study was to characterize the incidence of growth disturbance following intra-articular distal radius fractures in skeletally immature patients and to assess early radiographic and functional outcomes. METHODS: A retrospective investigation of pediatric patients with intra-articular distal radius fractures between 1997 and 2012 at a single institution was performed. Pathologic fractures and fractures in patients with closed physes were excluded. In total, 28 patients (24 males, 4 females), with a mean age of 13.8 years and mean follow-up of 31.7 months, met inclusion criteria. Fractures were categorized according to the Salter-Harris classification, and all radiographs were assessed for evidence of physeal disturbance. Information regarding treatment and early clinical results were obtained from a medical record review. Functional outcomes using the Disabilities of the Arm, Shoulder, and Hand (DASH) and Modified Mayo Wrist Score (MMWS) were collected. Fisher exact test was used to compare the incidence of physeal arrest in the study population to previously published rates of physeal arrest in extra-articular fractures involving the distal radius. Because the data were not parametrically distributed, the Mann-Whitney-Wilcoxon test was used to compare those who did and did not develop physeal arrest. RESULTS: Of the 28 patients, 9 (32%) sustained Salter-Harris III fractures and 19 (68%) sustained Salter-Harris IV fractures. Growth disturbance occurred in 12 (43%) patients, comprised of 3 Salter-Harris III fractures and 9 Salter-Harris IV fractures; 7 of these patients underwent surgical intervention to address deformity. All 4 children age 10 years or younger had growth arrests that underwent subsequent procedures for a skeletal rebalancing of the wrist. No significant differences in DASH or MMWS were seen in the short term between patients who did or did not have physeal arrest. CONCLUSIONS: Intra-articular distal radius fractures in skeletally immature patients have a considerably higher rate of physeal growth arrest than extra-articular physeal fractures. Following acute management aimed at restoring and preserving anatomic physeal and articular alignment, follow-up radiographs should be obtained to evaluate for physeal arrest in skeletally immature children. Patients and families should be counseled regarding the high rate of growth disturbance and the potential need for deformity correction in the future, particularly in younger children. LEVEL OF EVIDENCE: IV-case series.


Asunto(s)
Placa de Crecimiento/fisiopatología , Fracturas del Radio/fisiopatología , Radio (Anatomía)/fisiopatología , Fracturas de Salter-Harris/fisiopatología , Traumatismos de la Muñeca/fisiopatología , Adolescente , Niño , Femenino , Humanos , Masculino , Radiografía , Radio (Anatomía)/cirugía , Fracturas del Radio/diagnóstico por imagen , Fracturas del Radio/cirugía , Estudios Retrospectivos , Fracturas de Salter-Harris/diagnóstico por imagen , Articulación de la Muñeca
2.
NMR Biomed ; 32(6): e4083, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-30889311

RESUMEN

INTRODUCTION: Clinical trials that involve participants from multiple sites necessitate standardized and reliable quantitative MRI outcomes to detect significant group differences over time. Metabolite concentrations measured by proton MRS (1 H-MRS) provide valuable information about in vivo metabolism of the central nervous system, but can vary based on the acquisition and quantitation methods used by different MR sites. Therefore, we investigated the intra- and inter-site reproducibility of metabolite concentrations measured by 1 H-MRS on MRI scanners from a single manufacturer across six sites. METHODS: Five healthy controls were scanned twice within 24 h at six participating 3 T MR sites with large single-voxel PRESS (TE/TR/NSA = 36 ms/4000 ms/56) and anatomical images for voxel positioning and correction of partial volume relaxation. Absolute metabolite concentrations were calculated relative to the T1 and T2 relaxation corrected signal from water. Intra- and inter-site reproducibility was assessed using Bland-Altman plots and intra- and inter-site coefficient of variation (CoV) as well as intra- and inter-site intra-class correlation coefficient. RESULTS: The median intra-site CoVs for the five major metabolite concentrations ([NAA], [tCr], [Glu], [tCho] and [Ins]) were between 2.5 and 5.3%. Inter-site CoVs were also low, with the median CoVs for all metabolites between 3.7 and 6.4%. Metabolite concentrations were robust to small inconsistencies in voxel placement and site was not the driving factor in the variance of the measurement of any metabolite concentration. Between-subject differences accounted for the majority of the concentration variability for creatine, choline and myo-inositol (42-65% of the variance). CONCLUSION: A large single-voxel 1 H-MRS acquisition from a single manufacturer's MRI scanner is highly reproducible and reliable for multi-site clinical trials.


Asunto(s)
Encéfalo/diagnóstico por imagen , Espectroscopía de Resonancia Magnética , Adulto , Femenino , Humanos , Modelos Lineales , Masculino , Metaboloma , Persona de Mediana Edad , Reproducibilidad de los Resultados , Adulto Joven
5.
Curr Rheumatol Rep ; 19(9): 54, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28752490

RESUMEN

PURPOSE OF REVIEW: One justification for using expensive biologic therapy in rheumatoid arthritis (RA) has been that it can reduce future healthcare utilization such as joint surgeries and physician visits. However, the evidence to support this assertion is unclear. We conducted a review of the literature for studies which have analyzed the trends in resource use of RA patients, and then undertook a retrospective observational analysis of a Canadian administrative database using instrumental variable methods. RECENT FINDINGS: Our review found a trend in reduced resource utilization prior to the introduction of biologics and no evidence that biologic therapies have specifically contributed to this reduction. Our observational analysis, which overcame some of the epidemiological challenges with determining the influence of biologics on resource utilization, found a possible reduction in other medications but possible increases rather than decreases in physician visits and hospitalizations. However, our sample was not sufficiently large to make definitive conclusions. Over 15 years since the introduction of biologics for RA, no evidence exists supporting the assumption that biologic therapies reduce future healthcare utilization. While such a question is challenging to generate evidence for, and so an absence of evidence does not suggest that the hypothesis is incorrect, an instrumental variable analysis using sufficient data could provide definitive evidence.


Asunto(s)
Artritis Reumatoide/terapia , Terapia Biológica , Terapia Biológica/economía , Terapia Biológica/estadística & datos numéricos , Humanos
6.
Sci Adv ; 10(31): eadn8750, 2024 Aug 02.
Artículo en Inglés | MEDLINE | ID: mdl-39083598

RESUMEN

Sickle cell disease is a growing health burden afflicting millions around the world. Clinical observation and laboratory studies have shown that the severity of sickle cell disease is ameliorated in individuals who have elevated levels of fetal hemoglobin. Additional pharmacologic agents to induce sufficient fetal hemoglobin to diminish clinical severity is an unmet medical need. We recently found that up-regulation of peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) can induce fetal hemoglobin synthesis in human primary erythroblasts. Here, we report that a small molecule, SR-18292, increases PGC-1α leading to enhanced fetal hemoglobin expression in human erythroid cells, ß-globin yeast artificial chromosome mice, and sickle cell disease mice. In SR-18292-treated sickle mice, sickled red blood cells are significantly reduced, and disease complications are alleviated. SR-18292, or agents in its class, could be a promising additional therapeutic for sickle cell disease.


Asunto(s)
Anemia de Células Falciformes , Antidrepanocíticos , Hemoglobina Fetal , Coactivador 1-alfa del Receptor Activado por Proliferadores de Peroxisomas gamma , Anemia de Células Falciformes/tratamiento farmacológico , Anemia de Células Falciformes/metabolismo , Anemia de Células Falciformes/patología , Hemoglobina Fetal/metabolismo , Hemoglobina Fetal/genética , Animales , Humanos , Coactivador 1-alfa del Receptor Activado por Proliferadores de Peroxisomas gamma/metabolismo , Coactivador 1-alfa del Receptor Activado por Proliferadores de Peroxisomas gamma/genética , Ratones , Antidrepanocíticos/farmacología , Antidrepanocíticos/uso terapéutico , Modelos Animales de Enfermedad , Globinas beta/genética , Globinas beta/metabolismo
7.
J Magn Reson Imaging ; 38(6): 1445-53, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23553991

RESUMEN

PURPOSE: To assess the reproducibility of myelin water fraction (MWF) and geometric mean T2 (GMT2 ), which are in vivo markers of pathological changes underlying disability and progression in diseases such as multiple sclerosis. MATERIALS AND METHODS: Five healthy volunteers were scanned twice within 24 hours at six different sites using the same manufacturer's 3T magnetic resonance (MR) system. T2 distributions were produced by fitting multiecho 3D T2 data using non-negative least squares, with stimulated echo correction. MWF, the fraction of signal with T2 between 15 and 40 msec to the entire signal, and GMT2 , the mean T2 on a logarithmic scale from T2 between 40 and 200 msec, were examined in white matter. RESULTS: Intrasite coefficients of variation (COVs) were low (mean 3.99% for MWF and 0.51% for GMT2 ), as were intersite COVs (mean 4.68% for MWF, 0.31% for GMT2 ). Scan-rescan intraclass correlation coefficients (ICCs) (0.76 for MWF and 0.93 for GMT2 ) and Bland-Altman plots indicated good agreement between single site scans. Intersite ICCs were relatively high (0.69 for MWF and 0.92 for GMT2 ), revealing good intersite reliability. CONCLUSION: MWF and GMT2 measures are reproducible between scans and across sites with an equivalent MR scanner and sequence protocol. Multicenter clinical trials using quantitative T2 relaxation are feasible.


Asunto(s)
Agua Corporal/metabolismo , Encéfalo/anatomía & histología , Encéfalo/metabolismo , Imagen por Resonancia Magnética/métodos , Vaina de Mielina/metabolismo , Adulto , Colombia Británica , Interpretación Estadística de Datos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Sensibilidad y Especificidad
8.
Drug Discov Today ; 28(5): 103552, 2023 05.
Artículo en Inglés | MEDLINE | ID: mdl-36907319

RESUMEN

The microbiota-gut-brain axis (MGBA) is important in maintaining the structure and function of the central nervous system (CNS) and is regulated by the CNS environment and signals from the peripheral tissues. However, the mechanism and function of the MGBA in alcohol use disorder (AUD) are still not completely understood. In this review, we investigate the underlying mechanisms involved in the onset of AUD and/or associated neuronal deficits and create a foundation for better treatment (and prevention) strategies. We summarize recent reports focusing on the alteration of the MGBA in AUD. Importantly, we highlight the properties of small-molecule short-chain fatty acids (SCFAs), neurotransmitters, hormones, and peptides in the MGBA and discusses their usage as therapeutic agents against AUD.


Asunto(s)
Alcoholismo , Humanos , Alcoholismo/tratamiento farmacológico , Eje Cerebro-Intestino , Encéfalo , Sistema Nervioso Central
9.
Eur J Cancer ; 188: 8-19, 2023 07.
Artículo en Inglés | MEDLINE | ID: mdl-37178647

RESUMEN

AIM: This phase I/expansion study assessed the safety, pharmacokinetics and preliminary antitumor activity of afatinib in paediatric patients with cancer. METHODS: The dose-finding part enroled patients (2-<18 years) with recurrent/refractory tumours. Patients received 18 or 23 mg/m2/d afatinib orally (tablet or solution) in 28-d cycles. In the maximum tolerated dose (MTD) expansion, eligible patients (1-<18 years) had tumours fulfilling ≥2 of the following criteria in the pre-screening: EGFR amplification; HER2 amplification; EGFR membrane staining (H-score>150); HER2 membrane staining (H-score>0). The primary end-points were dose-limiting toxicities (DLTs), afatinib exposure, and objective response. RESULTS: Of 564 patients pre-screened, 536 patients had biomarker data and 63 (12%) fulfilled ≥2 EGFR/HER2 criteria required for inclusion in the expansion part. A total of 56 patients were treated (17 in the dose-finding and 39 in the expansion part). DLTs were observed in one of six MTD-evaluable patients receiving 18 mg/m²/d and in two of five MTD-evaluable patients receiving 23 mg/m²/d; 18 mg/m²/d was defined as the MTD. There were no new safety signals. Pharmacokinetics confirmed exposure consistent with the approved dose in adults. One partial response (-81% per Response Assessment in Neuro-Oncology) was observed in a patient with a glioneuronal tumour harbouring a CLIP2::EGFR fusion; unconfirmed partial responses were observed in two patients. In total, 25% of patients experienced objective response or stable disease (95% confidence interval: 14-38). CONCLUSION: Targetable EGFR/HER2 drivers are rare in paediatric cancers. Treatment with afatinib led to a durable response (>3 years) in one patient with a glioneuronal tumour with CLIP2::EGFR fusion.


Asunto(s)
Neoplasias , Niño , Humanos , Afatinib/uso terapéutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Receptores ErbB/genética , Neoplasias/patología , Preescolar , Adolescente
10.
Prev Med ; 55(5): 500-4, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22954518

RESUMEN

OBJECTIVE: This study examined whether childhood sexual abuse predicts initiation of injection drug use in a prospective cohort of youth. METHOD: From October 2005 to November 2010, data were collected from the At Risk Youth Study (ARYS), a prospective cohort study of street-involved youth in Vancouver, Canada. Inclusion criteria were age 14-26 years, no lifetime drug injection, and non-injection drug use in the month preceding enrollment. Participants were interviewed at baseline and semiannually thereafter. Cox regression was employed to identify risk factors for initiating injection. RESULTS: Among 395 injection-naïve youth, 81 (20.5%) reported childhood sexual abuse. During a median follow-up of 15.9 months (total follow-up 606.6 person-years), 45 (11.4%) youth initiated injection drug use, resulting in an incidence density of 7.4 per 100 person-years. In univariate analyses, childhood sexual abuse was associated with increased risk of initiating injection (unadjusted hazard ratio [HR], 2.38; 95% confidence interval [CI], 1.29-4.38; p=0.006), an effect that persisted in multivariate analysis despite adjustment for gender, age, aboriginal ancestry and recent non-injection drug use (adjusted HR, 2.71; 95% CI, 1.42-5.20; p=0.003). CONCLUSION: Childhood sexual abuse places drug users at risk for initiating injection. Addiction treatment programs should incorporate services for survivors of childhood maltreatment.


Asunto(s)
Adultos Sobrevivientes del Maltrato a los Niños/psicología , Abuso Sexual Infantil/psicología , Jóvenes sin Hogar/psicología , Abuso de Sustancias por Vía Intravenosa/epidemiología , Adolescente , Adulto , Adultos Sobrevivientes del Maltrato a los Niños/estadística & datos numéricos , Colombia Británica/epidemiología , Abuso Sexual Infantil/estadística & datos numéricos , Femenino , Humanos , Incidencia , Masculino , Análisis Multivariante , Modelos de Riesgos Proporcionales , Estudios Prospectivos , Abuso de Sustancias por Vía Intravenosa/psicología , Adulto Joven
11.
BMC Public Health ; 12: 189, 2012 Mar 13.
Artículo en Inglés | MEDLINE | ID: mdl-22414406

RESUMEN

BACKGROUND: Regular HIV testing among people who inject drugs is an essential component of HIV prevention and treatment efforts. We explored HIV testing behaviour among a community-recruited sample of injection drug users (IDU) in Bangkok, Thailand. METHODS: Data collected through the Mitsampan Community Research Project were used to examine correlates of HIV testing behaviour among IDU and to explore reasons for not being tested. Multivariate logistic regression was used to examine factors associated with willingness to access HIV testing at the drug-user-run Mitsampan Harm Reduction Centre (MSHRC). RESULTS: Among the 244 IDU who participated in this study, 186 (76.2%) reported receiving HIV testing in the previous six months. Enrolment in voluntary drug treatment (odds ratio [OR] = 2.34; 95% confidence interval [CI]: 1.18-4.63) and the tenofovir trial (OR = 44.81; 95%CI: 13.44-149.45) were positively associated with having been tested, whereas MSHRC use (OR = 1.78; 95%CI: 0.96-3.29) was marginally associated with having been tested. 56.9% of those who had not been tested reported in engaging in HIV risk behaviour in the past six months. 181 (74.2%) participants were willing to be tested at the MSHRC if testing were offered there. In multivariate analyses, willingness to get HIV testing at the MSHRC was positively associated with ever having been to the MSHRC (adjusted odds ratio [AOR] = 2.42; 95%CI: 1.21-4.85) and, among females, being enrolled in voluntary drug treatment services (AOR = 9.38; 95%CI: 1.14-76.98). CONCLUSIONS: More than three-quarters of IDU received HIV testing in the previous six months. However, HIV risk behaviour was common among those who had not been tested. Additionally, 74.2% of participants were willing to receive HIV testing at the MSHRC. These findings provide evidence for ongoing HIV prevention education, as well potential benefits of incorporating HIV testing for IDU within peer-led harm reduction programs.


Asunto(s)
Serodiagnóstico del SIDA/estadística & datos numéricos , Servicios de Salud Comunitaria/estadística & datos numéricos , Infecciones por VIH/prevención & control , Conocimientos, Actitudes y Práctica en Salud , Aceptación de la Atención de Salud , Abuso de Sustancias por Vía Intravenosa , Adulto , Femenino , Infecciones por VIH/psicología , Infecciones por VIH/transmisión , Humanos , Masculino , Persona de Mediana Edad , Abuso de Sustancias por Vía Intravenosa/complicaciones , Tailandia
12.
BMC Musculoskelet Disord ; 11: 282, 2010 Dec 14.
Artículo en Inglés | MEDLINE | ID: mdl-21156074

RESUMEN

BACKGROUND: Malunion is the most common complication of distal radius fracture. It has previously been demonstrated that there is a correlation between the quality of anatomical correction and overall wrist function. However, surgical correction can be difficult because of the often complex anatomy associated with this condition. Computer assisted surgical planning, combined with patient-specific surgical guides, has the potential to improve pre-operative understanding of patient anatomy as well as intra-operative accuracy. For patients with malunion of the distal radius fracture, this technology could significantly improve clinical outcomes that largely depend on the quality of restoration of normal anatomy. Therefore, the objective of this study is to compare patient outcomes after corrective osteotomy for distal radius malunion with and without preoperative computer-assisted planning and peri-operative patient-specific surgical guides. METHODS/DESIGN: This study is a multi-center randomized controlled trial of conventional planning versus computer-assisted planning for surgical correction of distal radius malunion. Adult patients with extra-articular malunion of the distal radius will be invited to enroll in our study. After providing informed consent, subjects will be randomized to two groups: one group will receive corrective surgery with conventional preoperative planning, while the other will receive corrective surgery with computer-assisted pre-operative planning and peri-operative patient specific surgical guides. In the computer-assisted planning group, a CT scan of the affected forearm as well as the normal, contralateral forearm will be obtained. The images will be used to construct a 3D anatomical model of the defect and patient-specific surgical guides will be manufactured. Outcome will be measured by DASH and PRWE scores, grip strength, radiographic measurements, and patient satisfaction at 3, 6, and 12 months postoperatively. DISCUSSION: Computer-assisted surgical planning, combined with patient-specific surgical guides, is a powerful new technology that has the potential to improve the accuracy and consistency of orthopaedic surgery. To date, the role of this technology in upper extremity surgery has not been adequately investigated, and it is unclear whether its use provides any significant clinical benefit over traditional preoperative imaging protocols. Our study will represent the first randomized controlled trial investigating the use of computer assisted surgery in corrective osteotomy for distal radius malunions. TRIAL REGISTRATION: NCT01193010.


Asunto(s)
Fracturas Mal Unidas/cirugía , Osteotomía/métodos , Fracturas del Radio/cirugía , Cirugía Asistida por Computador/métodos , Adulto , Fracturas Mal Unidas/diagnóstico por imagen , Humanos , Evaluación de Resultado en la Atención de Salud , Fracturas del Radio/diagnóstico por imagen , Tomografía Computarizada por Rayos X , Resultado del Tratamiento
13.
Pediatr Dent ; 42(4): 293-299, 2020 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-32847669

RESUMEN

Purpose: The purpose of this study was to evaluate the clinical and radiographic effectiveness of Biodentine® as a pulpotomy medicament for use in primary molars. Methods: A retrospective chart review was conducted on children who had received full-mouth dental rehabilitation under general anesthesia between January 1, 2013, and May 1, 2018. Three clinical outcomes (pain, pathologic mobility, and soft tissue pathology) and two radiographic outcomes (pathologic radiolucency and pathologic root resorption) defined a composite outcome of pulp therapy failure. Results: The final study sample consisted of 208 children with a mean age of 4.9 years. The total number of primary molars that received a Biodentine® pulpotomy over the 30-month posttreatment period was 608. Survival analyses determined that the cumulative probability of clinical survival at 30 months was 93.7 percent (95 percent confidence interval [95% CI] equals 83.7 percent to 99.2 percent) and radiographic survival probability was 85.6 percent (95% CI equals 76.3 percent to 93.7 percent). The majority (n equals 14 out of 20; 70 percent) of failed Biodentine® pulpotomies occurred before 18 months. Conclusions: Primary molar pulpotomies utilizing Biodentine® as the pulpal medicament had favorable clinical and radiographic results after 30 months. Biodentine® can be considered an alternative to other commonly used primary tooth pulpotomy medicaments.


Asunto(s)
Compuestos de Calcio , Pulpotomía , Niño , Preescolar , Combinación de Medicamentos , Humanos , Diente Molar , Óxidos , Estudios Retrospectivos , Silicatos , Diente Primario , Resultado del Tratamiento
14.
JCO Glob Oncol ; 6: 704-721, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-32392090

RESUMEN

PURPOSE: Despite being the most common pediatric solid tumors, incidence and outcome of CNS tumors in Chinese children have not been systematically reported. We addressed this knowledge gap by comparing the epidemiology of pediatric CNS tumors in Hong Kong and the United States. PATIENTS AND METHODS: Data between 1999 and 2016 from a population-based cancer registry in Hong Kong, China, on patients < 18 years old with CNS tumors (Hong Kong cohort) and from the US SEER Program (Asian/Pacific Islander and all ethnicities) were compared. Incidence and overall survival (OS) by histology were evaluated. RESULTS: During the study period, 526 children were newly diagnosed with CNS tumors in Hong Kong (crude incidence rate, 2.47 per 100,000; 95% CI, 2.26 to 2.69). Adjusted incidences were significantly lower in the Hong Kong (2.51; 95% CI, 2.30 to 2.74) than in the SEER (Asian/Pacific Islander: 3.26; 95% CI, 2.97 to 3.57; P < .001; all ethnicities: 4.10 per 100,000; 95% CI, 3.99 to 4.22; P < .001) cohorts. Incidences of germ cell tumors (0.57 v 0.24; P < .001) were significantly higher, but those of glial and neuronal tumors (0.94 v 2.61; P < .001), ependymomas (0.18 v 0.31; P = .005), and choroid plexus tumors (0.08 v 0.16; P = .045) were significantly lower in Hong Kong compared with SEER (all ethnicities) cohorts. Compared with the SEER (Asian/Pacific Islander) cohort, histology-specific incidences were similar except for a lower incidence of glial and neuronal tumors in Hong Kong (0.94 v 1.74; P < .001). Among cohorts, OS differed only for patients with glial and neuronal tumors (5-year OS: Hong Kong, 52.5%; SEER [Asian/Pacific Islander], 73.6%; SEER [all ethnicities], 79.9%; P < .001). CONCLUSION: We identified important ethnic differences in the epidemiology of CNS tumors in Chinese children. These results will inform the development of pediatric neuro-oncology services in China and aid further etiologic studies.


Asunto(s)
Neoplasias del Sistema Nervioso Central , Adolescente , Neoplasias del Sistema Nervioso Central/epidemiología , Niño , China/epidemiología , Hong Kong/epidemiología , Humanos , Incidencia , Programa de VERF , Estados Unidos/epidemiología
15.
J Hand Surg Am ; 34(7): 1261-8, 2009 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-19576700

RESUMEN

PURPOSE: Previous in vivo and in vitro studies of forearm supination-pronation suggest that distal radioulnar joint kinematics may be affected by elbow flexion. The primary hypotheses tested by this study were that, in vivo, ulnar variance changes with elbow flexion and forearm rotation, and the arc of forearm rotation changes in relationship to elbow flexion. METHODS: Changes in radioulnar kinematics during forearm supination-pronation and elbow flexion (0 degrees to 90 degrees ) were studied in 5 uninjured subjects using computed tomography, dual-orthogonal fluoroscopy, and 3-dimensional modeling. Analysis of variance and post-hoc testing was performed. RESULTS: Proximal translation of the radius was greatest with the elbow flexed to 90 degrees with the arm in midpronation. With the arm in midpronation, the translation of the radius was significantly greater at 0 degrees versus 45 degrees of elbow flexion (0.82 +/- 0.59 mm vs 0.65 +/- 0.80 mm, F: 4.49, post hoc: 0.055; p = .05) and significantly smaller at 45 degrees versus 90 degrees of elbow flexion (0.65 +/- 0.80 mm vs 0.97 +/- 0.35 mm, F: 4.49, post hoc: 0.048; p = .05). Proximal translation of the radius in midpronation was significantly greater than when the forearm was in a supinated position when the elbow was at 0 degrees or 90 degrees flexion (F: 14.90, post hoc: <0.01; p < .01, F: 19.11, post hoc: <0.01, p < .01). The arc of forearm rotation was significantly decreased at 0 degrees compared with 90 degrees of elbow flexion (129.3 degrees +/- 22.2 degrees vs 152.8 degrees +/- 14.4 degrees , F: 3.29, post hoc: 0.79; p = .09). The center of rotation shifted volarly and ulnarly with increasing elbow extension. CONCLUSIONS: Elbow position affects the kinematics of the distal radioulnar joint. The kinematics of the distal radioulnar joint are primarily affected by forearm rotation and secondarily by elbow flexion. These findings have clinical relevance to our understanding of ulnar impaction, and how elbow position affects the proximal-distal translation of the radius. These findings have implications for the treatment of ulna impaction, radiographic evaluation of the distal ulna, and future biomechanical studies.


Asunto(s)
Articulación del Codo/fisiología , Pronación/fisiología , Radio (Anatomía)/fisiología , Rango del Movimiento Articular/fisiología , Supinación/fisiología , Cúbito/fisiología , Adulto , Fenómenos Biomecánicos , Articulación del Codo/diagnóstico por imagen , Fluoroscopía , Antebrazo/diagnóstico por imagen , Antebrazo/fisiología , Humanos , Imagenología Tridimensional , Imagen por Resonancia Magnética , Masculino , Radio (Anatomía)/diagnóstico por imagen , Valores de Referencia , Tomografía Computarizada por Rayos X , Cúbito/diagnóstico por imagen , Adulto Joven
16.
Pediatr Dent ; 41(2): 112-118, 2019 Mar 15.
Artículo en Inglés | MEDLINE | ID: mdl-30992108

RESUMEN

Purpose: The purpose of this pilot study was to determine whether an audiovisual intervention was more effective than verbal instructions at reducing preoperative anxiety levels for parents whose children were having their first experience of dental treatment with the use of oral sedation. Methods: A prospective clinical trial was conducted. Parents were systematically assigned to either view an animated video (intervention group) or receive standardized verbal instructions (control group). Questionnaires modified from the Amsterdam Preoperative Anxiety and Information Scale were distributed to parents at the assessment appointment before the preoperative information was given (T0) and again at the subsequent sedation appointment (T1). The change in parental anxiety levels between T0 and T1 was measured (Δ equals T0-T1). Results: A total of 40 subjects comprised of 20 individuals each in the control and intervention group were included in the final analytical data set. There were no significant differences in the effectiveness of reducing preoperative parental anxiety between the audiovisual intervention and the verbal instructions. Conclusions: The audiovisual intervention was effective at reducing preoperative parental anxiety, but the reduction was not significantly different from using verbal instructions. Dentists may wish to incorporate audiovisual aids to supplement verbal instructions during the sedation preoperative consultation.


Asunto(s)
Anestesia Dental , Sedación Consciente , Ansiedad al Tratamiento Odontológico/prevención & control , Padres/educación , Padres/psicología , Citas y Horarios , Niño , Preescolar , Femenino , Humanos , Masculino , Proyectos Piloto , Estudios Prospectivos , Encuestas y Cuestionarios , Grabación de Cinta de Video
17.
J Neuroimaging ; 29(1): 42-51, 2019 01.
Artículo en Inglés | MEDLINE | ID: mdl-30230638

RESUMEN

BACKGROUND AND PURPOSE: Quantitative T1 and diffusion tensor imaging (DTI) may provide information about pathological changes underlying disability and progression in diseases like multiple sclerosis (MS). Imaging the corpus callosum (CC), a primary site of damage in MS with a critical role in interhemispheric connectivity, may be useful for assessing overall brain health, prognosis, and therapy efficacy. We assessed the feasibility of multisite clinical trials using advanced MRI by examining the intra and intersite reproducibility of T1 and DTI measurements in the CC and segmented white matter (WM). METHODS: Five healthy volunteers were scanned twice within 24 hours at six 3T sites. Coefficients of variation (COVs) and intraclass correlation coefficients (ICCs) for CC and WM T1 , fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (Dax ), and radial diffusivity (Drad ) assessed intrasite and intersite reliability. RESULTS: CC and WM T1 showed excellent intrasite reproducibility with low COVs (mean = .90% and .89%, respectively) and good ICCs (CC = .78, WM = .90). T1 also demonstrated intersite reliability (low COVs: CC = 2.4%, WM = 1.8%; moderate ICCs: CC = .43, WM = .69). DTI had low intrasite COVs (CC: FA = 1.3%, MD = 1.5%, Dax = 1.4%, Drad = 2.2%; WM: FA = .9%, MD = .9%, Dax = .7%, Drad = 1.2%) and high intrasite ICCs (CC: FA = .95, MD = .97, Dax = .94, Drad = .97; CC: FA = .9, MD = .66, Dax = .88, Drad = .63), indicating excellent intrasite reproducibility. DTI also showed excellent intersite reliability with low COVs (CC: FA = 2.1%, MD = 4.1%, Dax = 3.4%, Drad = 5.3%, WM: FA = 1.3%, MD = 1.9%, Dax = 1.8%, Drad = 2.1%,) and good ICCs (CC: FA = .90, MD = .84, Dax = .72, Drad = .90; WM: FA = .83, MD = .34, Dax = .62, Drad = .41). CONCLUSIONS: T1 and DTI measures are reproducible using equivalent MRI scanners and sequence protocols. Using a similar MR system, it is feasible to carry out multicenter studies using T1 and DTI to evaluate changes within the CC and WM.


Asunto(s)
Encéfalo/diagnóstico por imagen , Imagen de Difusión Tensora/métodos , Sustancia Blanca/diagnóstico por imagen , Adulto , Anisotropía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Adulto Joven
18.
Drug Alcohol Depend ; 120(1-3): 28-34, 2012 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-21764528

RESUMEN

BACKGROUND: Limited attention has been given to the potential role that the structure of housing available to people who are entrenched in street-based drug scenes may play in influencing the amount of time injection drug users (IDU) spend on public streets. We sought to examine the relationship between time spent socializing in Vancouver's drug scene and access to private space. METHODS: Using multivariate logistic regression we evaluated factors associated with socializing (three+ hours each day) in Vancouver's open drug scene among a prospective cohort of IDU. We also assessed attitudes towards relocating socializing activities if greater access to private indoor space was provided. RESULTS: Among our sample of 1114 IDU, 43% fit our criteria for socializing in the open drug scene. In multivariate analysis, having limited access to private space was independently associated with socializing (adjusted odds ratio: 1.80, 95% confidence interval: 1.28-2.55). In further analysis, 65% of 'socializers' reported positive attitudes towards relocating socializing if they had greater access to private space. CONCLUSION: These findings suggest that providing IDU with greater access to private indoor space may reduce one component of drug-related street disorder. Low-threshold supportive housing based on the 'housing first' model that include safeguards to manage behaviors associated with illicit drug use appear to offer important opportunities to create the types of private spaces that could support a reduction in street disorder.


Asunto(s)
Medio Social , Abuso de Sustancias por Vía Intravenosa/psicología , Adulto , Actitud , Colombia Británica/epidemiología , Ciudades , Femenino , Vivienda , Humanos , Masculino , Persona de Mediana Edad , Privacidad , Estudios Prospectivos , Factores de Riesgo , Conducta Social , Abuso de Sustancias por Vía Intravenosa/epidemiología , Abuso de Sustancias por Vía Intravenosa/prevención & control , Factores de Tiempo
19.
Int J Drug Policy ; 22(5): 376-84, 2011 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-21684142

RESUMEN

BACKGROUND: Income generation opportunities available to people who use illicit drugs have been associated with street disorder. Among a cohort of injection drug users (IDU) we sought to examine street-based income generation practices and willingness to forgo these sources of income if other low-threshold work opportunities were made available. METHODS: Data were derived from a prospective community recruited cohort of IDU. We assessed the prevalence of engaging in disorderly street-based income generation activities, including sex work, drug dealing, panhandling, and recycling/salvaging/vending. Using multivariate logistic regressions based on Akaike information criterion and the best subset selection procedure, we identified factors associated with disorderly income generation activities, and assessed willingness to forgo these sources of income during the period of November 2008 to July 2009. RESULTS: Among our sample of 874 IDU, 418 (48%) reported engaging in a disorderly income generation activity in the previous six months. In multivariate analyses, engaging in disorderly income generation activities was independently associated with high intensity stimulant use, as well as binge drug use, having encounters with police, being a victim of violence, sharing used syringes, and injecting in public areas. Among those engaged in disorderly income generation, 198 (47%) reported a willingness to forgo these income sources if given opportunities for low-threshold employment, with sex workers being most willing to engage in alternative employment. CONCLUSION: Engagement in disorderly street-based income generation activities was associated with high intensity stimulant drug use and various markers of risk. We found that a high proportion of illicit drug users were willing to cease engagement in these activities if they had options for causal low-threshold employment. These findings indicate that there is a high demand for low-threshold employment that may offer important opportunities to reduce drug-related street disorder and associated harms.


Asunto(s)
Empleo/psicología , Drogas Ilícitas/economía , Abuso de Sustancias por Vía Intravenosa/epidemiología , Adulto , Estudios de Cohortes , Bases de Datos Factuales , Vías de Administración de Medicamentos , Consumidores de Drogas/psicología , Empleo/métodos , Femenino , Humanos , Drogas Ilícitas/metabolismo , Drogas Ilícitas/provisión & distribución , Renta , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Reciclaje/economía , Características de la Residencia , Trabajo Sexual/psicología , Trabajadores Sexuales/psicología , Abuso de Sustancias por Vía Intravenosa/economía , Abuso de Sustancias por Vía Intravenosa/psicología , Trastornos Relacionados con Sustancias/economía , Trastornos Relacionados con Sustancias/epidemiología , Trastornos Relacionados con Sustancias/metabolismo , Jeringas
20.
Am J Sports Med ; 37(3): 534-41, 2009 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-19088056

RESUMEN

BACKGROUND: In vitro data suggest that injury to the posterior cruciate ligament stresses the posterolateral structures of the knee, placing them at greater risk of secondary injury. However, it is not known how isolated posterior cruciate ligament deficiency affects these soft tissue stabilizers of the knee joint in vivo. HYPOTHESIS: Posterior cruciate ligament deficiency will alter the apparent length patterns of the lateral collateral ligament (LCL) and popliteus. STUDY DESIGN: Controlled laboratory study. METHODS: The apparent length changes in the lateral collateral ligament and popliteus muscle-tendon unit during weightbearing knee flexion were studied in 14 patients with isolated, unilateral posterior cruciate ligament deficiency using magnetic resonance imaging, dual-orthogonal fluoroscopy, and 3-dimensional modeling. Data of the injured and uninjured contralateral sides were compared. RESULTS: Posterior cruciate ligament deficiency caused significant increases in the apparent length of both posterolateral structures (P < .05). The differences between injured and uninjured contralateral side were greatest at 120 degrees of knee flexion in the lateral collateral ligament (48.2 +/- 6.1 mm and 51.6 +/- 6.1 mm, respectively) and at 30 degrees of knee flexion in the popliteus (101.2 +/- 9.3 mm and 110.4 +/- 10.2 mm, respectively). CONCLUSION: Deficiency of the posterior cruciate ligament alters the length patterns of posterolateral structures in vivo and might place them at greater risk of secondary injury. CLINICAL RELEVANCE: Reestablishment of normal kinematics after posterior cruciate ligament injury is critical for restoring normal function of posterolateral structures of the knee.


Asunto(s)
Inestabilidad de la Articulación/fisiopatología , Traumatismos de la Rodilla/fisiopatología , Ligamento Cruzado Posterior/lesiones , Traumatismos de los Tejidos Blandos/fisiopatología , Adolescente , Adulto , Femenino , Fluoroscopía , Humanos , Imagenología Tridimensional , Articulación de la Rodilla/anatomía & histología , Imagen por Resonancia Magnética , Masculino , Ligamento Cruzado Posterior/fisiopatología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA