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1.
Rev Sci Instrum ; 94(5)2023 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-37204283

RESUMEN

We have developed a new scintillator-based optical soft x-ray (OSXR) diagnostic system for KSTAR. By utilizing fiber optic faceplates, mm-size lens arrays, and fiber bundles, we have successfully constructed a novel optical system for scintillator-based soft x-ray detection to overcome the limited vacuum-port conditions in KSTAR. P47 (Y2SiO5), which has a fast rise (∼7 ns) and decay (∼100 ns) time sufficient for detecting plasma instabilities observed in the kHz-MHz spectral range, was selected as the scintillator material for the KSTAR OSXR system. Scintillation toward each detection channel is collected by the lens arrays coupled to optical fiber cores, which are connected to the photodetector system. Initial results obtained during the 2022 KSTAR experimental campaign support the validity of the OSXR data through the consistency of OSXR measurement results with other diagnostics. We also observe that the OSXR system can capture magnetohydrodynamic activities, such as sawtooth oscillations, and provide valuable information for disruption mitigation studies using shattered pellet injection.

2.
Interv Neuroradiol ; : 15910199221107440, 2022 Jun 09.
Artículo en Inglés | MEDLINE | ID: mdl-35679068

RESUMEN

Although accurate intracranial pressure (ICP) monitoring is essential for the diagnosis and treatment of severe brain diseases, current methods are performed invasively. Therefore, a safe and less invasive ICP measurement is required. The purpose of our study was to develop a simplified cranial cavity model for a better understanding of the relationship between the ICP and the pressure measurement within the dural venous sinus (DVS) to support the validity of using sinus pressure as the surrogate of the ICP. The in-house cranial cavity model had three components: the brain part, the DVS part, and the subarachnoid space (SAS) part. Pressure in other parts was measured when the pressure in the SAS part and, separately, brain part was increased from 0 (baseline) to 50 mmHg at intervals of 10 mmHg. When the pressure in the SAS part was increased from 10 to 50 mmHg at 10 mmHg interval, pressures of both the brain and DVS parts increased without significant difference (all P > 0.05). However, pressures in both the SAS and DVS parts differed while the pressure in the brain part was increased. The pressures in both parts showed about 70% of the increase in the brain part. Nevertheless, the pressures in the SAS and DVS parts were not significantly different (P > 0.05). A simplified in-house cranial cavity model was developed consisting of three compartments to represent the actual intracranial spaces. The pressure measurement within the DVS was feasible to use as a surrogate for the ICP measurement.

3.
Phys Rev Lett ; 126(6): 062501, 2021 Feb 12.
Artículo en Inglés | MEDLINE | ID: mdl-33635678

RESUMEN

In an emulsion-counter hybrid experiment performed at J-PARC, a Ξ^{-} absorption event was observed which decayed into twin single-Λ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as Ξ^{-}+^{14}N→_{Λ}^{10}Be+_{Λ}^{5}He. For the binding energy of the Ξ^{-} hyperon in the Ξ^{-}-^{14}N system a value of 1.27±0.21 MeV was deduced. The energy level of Ξ^{-} is likely a nuclear 1p state which indicates a weak ΞN-ΛΛ coupling.

4.
J Hosp Infect ; 106(3): 570-576, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-32828864

RESUMEN

BACKGROUND: Identifying the extent of environmental contamination of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is essential for infection control and prevention. The extent of environmental contamination has not been fully investigated in the context of severe coronavirus disease (COVID-19) patients. AIM: To investigate environmental SARS-CoV-2 contamination in the isolation rooms of severe COVID-19 patients requiring mechanical ventilation or high-flow oxygen therapy. METHODS: Environmental swab samples and air samples were collected from the isolation rooms of three COVID-19 patients with severe pneumonia. Patients 1 and 2 received mechanical ventilation with a closed suction system, while patient 3 received high-flow oxygen therapy and non-invasive ventilation. Real-time reverse transcription-polymerase chain reaction (rRT-PCR) was used to detect SARS-CoV-2; viral cultures were performed for samples not negative on rRT-PCR. FINDINGS: Of the 48 swab samples collected in the rooms of patients 1 and 2, only samples from the outside surfaces of the endotracheal tubes tested positive for SARS-CoV-2 by rRT-PCR. However, in patient 3's room, 13 of the 28 environmental samples (fomites, fixed structures, and ventilation exit on the ceiling) showed positive results. Air samples were negative for SARS-CoV-2. Viable viruses were identified on the surface of the endotracheal tube of patient 1 and seven sites in patient 3's room. CONCLUSION: Environmental contamination of SARS-CoV-2 may be a route of viral transmission. However, it might be minimized when patients receive mechanical ventilation with a closed suction system. These findings can provide evidence for guidelines for the safe use of personal protective equipment.


Asunto(s)
Infecciones por Coronavirus/terapia , Descontaminación/normas , Contaminación Ambiental/análisis , Oxigenoterapia Hiperbárica/normas , Habitaciones de Pacientes/normas , Neumonía Viral/terapia , Neumonía/terapia , Guías de Práctica Clínica como Asunto , Respiración Artificial/normas , Microbiología del Aire , COVID-19 , Humanos , Pandemias
5.
Phys Rev Lett ; 124(25): 252501, 2020 Jun 26.
Artículo en Inglés | MEDLINE | ID: mdl-32639790

RESUMEN

Transverse single-spin asymmetries of very forward neutral pions generated in polarized p+p collisions allow us to understand the production mechanism in terms of perturbative and nonperturbative strong interactions. During 2017, the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized p+p collisions at sqrt[s]=510 GeV. The large nonzero asymmetries increasing both in longitudinal momentum fraction x_{F} and transverse momentum p_{T} have been observed at low transverse momentum p_{T}<1 GeV/c for the first time, at this collision energy. The asymmetries show an approximate x_{F} scaling in the p_{T} region where nonperturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.

6.
Colorectal Dis ; 22(4): 399-407, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-31698537

RESUMEN

AIM: Preoperative factors predictive of permanent stoma creation were investigated in a long-term follow-up of patients with mid or low rectal cancer. METHOD: We included patients who underwent radical resection for mid or low rectal cancer with available data for preoperative anal function measured by manometry and Faecal Incontinence Severity Index questionnaire between January 2005 and December 2015 in three tertiary referral hospitals. A permanent stoma was defined as a stoma present until the patient's last follow-up visit or death. Preoperative factors that predicted permanent stoma creation were analysed. RESULTS: Over a median follow-up of 57.4 months (range 12-143 months), a permanent stoma was created in 144/577 (25.0%) patients, including 89 (15.4%) who underwent abdominoperineal resection, one (0.2%) who underwent Hartmann's operation without reversal, 15 (2.6%) with a diverting ileostomy at the time of initial sphincter-preserving surgery without undergoing stoma reversal, and 39 (6.8%) who underwent permanent ileostomy formation after sphincter-preserving surgery. Patients with permanent stoma creation had a shorter tumour distance from the anal verge (P < 0.001), larger tumour size (P = 0.020) and higher preoperative Faecal Incontinence Severity Index score (P = 0.020). On multivariable analysis, tumour distance from the anal verge predicted permanent stoma formation (relative risk 0.53 per centimetre increase; 95% confidence interval 0.46-0.60; P < 0.001) but preoperative anal function did not. CONCLUSION: Tumour distance from the anal verge was the only preoperative determinant of permanent stoma creation in rectal cancer patients. These data may help mid and low rectal cancer patients understand the need for permanent stoma.


Asunto(s)
Neoplasias del Recto , Estomas Quirúrgicos , Canal Anal/cirugía , Estudios de Cohortes , Humanos , Ileostomía , Neoplasias del Recto/cirugía
7.
Public Health Action ; 9(3): 128-134, 2019 Sep 21.
Artículo en Inglés | MEDLINE | ID: mdl-31803585

RESUMEN

SETTING: Nineteen health facilities in rural, southeastern Malawi. OBJECTIVE: To describe the implementation and results of a 6-week intervention to accelerate human immunodeficiency virus (HIV) case finding. DESIGN: Six HIV testing strategies were simultaneously implemented. Routinely collected data from Ministry of Health registers were used to determine the number of HIV tests performed and of new cases identified. The weekly averages of the total number of tests and new cases before and during the intervention were compared. Testing by age group and sex was described. The percentage yield of new cases was compared by testing strategy. RESULTS: Of 29 703 HIV tests conducted, 1106 (3.7%) were positive. Of the total number of persons tested, 69.5% were women and 75.5% were aged >15 years. The yield of positive test results was 3.5% among women, 4.3% among men, 4.4% among those aged >15 years and 1.5% among those aged ⩽15 years. The average weekly number of tests increased 106.7% from 3337 to 6896 (P = 0.002). The average weekly number of positive cases identified increased 51.9% from 158 to 240 (P = 0.017). The testing strategy with the highest yield resulted in a 6.0% yield; the lowest was 1.3%. The yield for all strategies, except one, was highest in adult men. CONCLUSION: A multi-strategy approach to HIV testing and counseling can be an effective means of accelerating HIV case finding.

8.
Colorectal Dis ; 21(10): 1175-1182, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31124259

RESUMEN

AIM: This study aimed to investigate the association between Twitter exposure and the number of citations for coloproctology articles. METHOD: Original articles from journals using Twitter between June 2015 and May 2016 were evaluated for the following characteristics: publishing journal; article subject; study design; nationality, speciality and affiliation of the author(s); and reference on Twitter. Citation data for these articles were retrieved from Google Scholar (https://scholar.google.com) in January 2018. We performed a univariate analysis using these data followed by a multivariate, logistic regression analysis to search for factors associated with a high citation level, which was defined as accrual of more than five citations. RESULTS: Out of six coloproctology journals listed on the InCites JCR database, three (Diseases of the Colon & Rectum, Colorectal Disease and Techniques in Coloproctology) used Twitter, where 200 (49.5%) out of a total of 404 articles had been featured. Citation rates of articles that featured on Twitter were significantly higher than those that did not (11.4 ± 9.2 vs 4.1 ± 3.1, P < 0.001). In multivariate analysis, Twitter exposure (OR 8.6, P = 0.001), European Union nationality (OR 2.4, P = 0.004), Colorectal Disease journal (OR 3.3, P = 0.005) and systematic review articles (OR 3.4, P = 0.009) were associated with higher citation levels. CONCLUSION: Article exposure on Twitter was strongly associated with a high citation level. Medical communities should encourage journals as well as physicians to actively utilize social media to expedite the spread of new ideas and ultimately benefit medical society as a whole.


Asunto(s)
Cirugía Colorrectal/estadística & datos numéricos , Factor de Impacto de la Revista , Medios de Comunicación Sociales/estadística & datos numéricos , Humanos , Análisis Multivariante
9.
Int Nurs Rev ; 66(2): 242-249, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-30474113

RESUMEN

AIM: To investigate the impacts of leader-member exchange and team-member exchange on job satisfaction and turnover intention of nurses. BACKGROUND: Leader-member exchange refers to the quality of relationships between leaders and members of a team and studies on this have generally focused on the aspect of member-leader-member exchanges. In nursing, the latter can refer to a situation where nurses (members) evaluate their relationship with their head nurse (leader). Member-leader-member exchange affects job satisfaction and turnover intention of nurses. However, even though all of these types of exchanges are important, few studies have examined their effects on job satisfaction and the turnover intention of nurses. METHODS: Participants in this descriptive study were 40 head nurses and 284 clinical nurses working at three hospitals in Korea. Data were collected from a questionnaire and analysed using hierarchical multiple regression. RESULTS: Leader-leader-member exchange, member-leader-member exchange, and team-member exchange had a positive effect on job satisfaction. However, only leader-leader-member exchange and member-leader-member exchange affected turnover intention. CONCLUSIONS: The impacts of leader-leader-member exchange, team-member exchange, and member-leader-member exchange on job satisfaction were confirmed. To reduce turnover intention, our study found it is more important to improve leader-member exchange than team-member exchange. IMPLICATIONS FOR NURSING PRACTICE: In health organizations, there is an important need to focus on the communication and exchange relationships between leaders and their staff, well as among the members, to increase job satisfaction. This will assist leaders to play an important role in lowering nurses' turnover intention and create an organizational culture in which nurses can communicate well with them. IMPLICATIONS FOR NURSING POLICY: Policy changes are needed so that the components of job performance evaluation for nurse leaders also include attendance at regular programmes, such as training to improve their leadership and communication skills, and consultations with their staff members.


Asunto(s)
Conducta Cooperativa , Relaciones Interprofesionales , Satisfacción en el Trabajo , Liderazgo , Cultura Organizacional , Reorganización del Personal/estadística & datos numéricos , Adulto , Actitud del Personal de Salud , Femenino , Humanos , Masculino , Persona de Mediana Edad , República de Corea
11.
Transplant Proc ; 50(10): 3222-3227, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30577189

RESUMEN

PURPOSE: The use of expanded-criteria deceased-donor (ECD) kidneys must be evaluated within the objective perspective of critical organ shortage and graft function and survival. In this study, we aimed to compare the clinical outcomes of ECD reliance with concurrent use of ideal-criteria deceased donors (IDDs) and non-ECDs in adult renal transplantation. METHODS: Between February 2000 and December 2015, we analyzed 405 deceased-donor renal transplants, specifically 129 grafts (31.9%) from ECDs, 233 grafts (57.5%) from non-ECDs, and 43 grafts (10.6%) from IDDs. ECDs were classified according to the United Network for Organ Sharing guidelines, while an IDD was defined as a younger person (10-39 years of age) with no medical risk factors who died from a traumatic head injury. Donor and recipient risk factors were separately analyzed and correlated with recipient graft function, and survival was evaluated. RESULTS: ECDs were older (56.8 ± 6.3 years); showed increased incidence of hypertension, diabetes, and cerebrovascular brain death; and had a higher pre-retrieval serum creatinine level than the other groups. ECD kidney recipients were also older (50.6 ± 9.8 years), had a shorter waiting time (P = .031), and demonstrated a low frequency of re-transplantation (P = .028). Long-term renal function followed longitudinally was lower in ECD kidney recipients until five years after transplantation, while the glomerular filtration rate (GFR) level at 7 and 10 years did not differ significantly among the groups (P = .074 and .262, respectively). There were no significant differences in terms of graft survival (P = .394) or patient survival (P = .737) among the groups. CONCLUSIONS: Although the long-term renal function followed longitudinally was lower in ECD kidney recipients, the use of renal grafts from ECDs is an acceptable method to resolve the disparity of critical organ shortage. However, the classification of the high-risk group should be updated with consideration given to differences in regional characteristics.


Asunto(s)
Trasplante de Riñón/métodos , Donantes de Tejidos/clasificación , Donantes de Tejidos/provisión & distribución , Adolescente , Adulto , Niño , Femenino , Supervivencia de Injerto , Humanos , Riñón/fisiopatología , Trasplante de Riñón/mortalidad , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Factores de Riesgo , Resultado del Tratamiento , Adulto Joven
12.
Nutr Metab Cardiovasc Dis ; 28(11): 1106-1113, 2018 11.
Artículo en Inglés | MEDLINE | ID: mdl-30287123

RESUMEN

BACKGROUNDS AND AIMS: We aimed to reveal the association between subclinical inflammation and metabolic risk factors and to determine the difference in the association between normal-weight and obese Korean individuals. METHODS AND RESULTS: Data collected from the Korean National Health and Nutrition Examination Survey (KNHANES) 2015, conducted from January to December 2015, were analyzed. Overall, 4620 subjects were examined and divided into two subgroups: 2987 and 1633 subjects in the normal-weight and obese groups, respectively. The prevalence of obesity in the study population was 34.5% (n = 1633). After multivariate adjustment, impaired fasting glucose (IFG) (odds ratio [OR] 1.22, 95% confidence interval [CI] 1.05-1.42, P = 0.010), high triglyceride (TG) levels (OR 1.29, 95% CI 1.13-1.47, P < 0.001), and low high-density lipoprotein-cholesterol (HDL-C) levels (OR 1.47, 95% CI 1.31-1.64, P < 0.001) were significantly associated with increased high-sensitivity C-reactive protein (hs-CRP) levels in the normal-weight group but not in the obesity group. CONCLUSION: Subclinical inflammation was associated with IFG, high TG levels, and low HDL-C levels in normal-weight Korean individuals. Prospective and biochemical research is necessary to clarify the role of subclinical systemic inflammation in individuals with normal body weight and its impact on insulin resistance and abnormal lipid metabolism, which promote the incidence of metabolic syndrome and cardiovascular disease.


Asunto(s)
Dislipidemias/epidemiología , Trastornos del Metabolismo de la Glucosa/epidemiología , Inflamación/epidemiología , Enfermedades Asintomáticas , Biomarcadores/sangre , Glucemia/metabolismo , Proteína C-Reactiva/análisis , HDL-Colesterol/sangre , Estudios Transversales , Dislipidemias/sangre , Dislipidemias/diagnóstico , Femenino , Trastornos del Metabolismo de la Glucosa/sangre , Trastornos del Metabolismo de la Glucosa/diagnóstico , Humanos , Inflamación/sangre , Inflamación/diagnóstico , Mediadores de Inflamación/sangre , Resistencia a la Insulina , Masculino , Persona de Mediana Edad , Encuestas Nutricionales , Obesidad/diagnóstico , Obesidad/epidemiología , Prevalencia , República de Corea/epidemiología , Factores de Riesgo , Triglicéridos/sangre
13.
Transplant Proc ; 50(4): 1068-1073, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29731067

RESUMEN

BACKGROUND: Comorbid conditions are important in the survival of kidney transplant recipients. The weights assigned to comorbidities to predict survival may vary based on the type of index disease and advances in the management of comorbidities. We aimed to develop a modified Charlson comorbidity index (CCI) in renal allograft recipients (mCCI-KT), thereby improving risk stratification for mortality. METHODS: A total of 3765 recipients in a multicenter cohort were included to develop a comorbidity score. The weights of the comorbidities, per the CCI, were recalibrated using a Cox proportional hazards model. RESULTS: Peripheral vascular disease, liver disease, myocardial infarction, and diabetes in the CCI were selected from the Cox proportional hazards model. Thus, the mCCI-KT included 4 comorbidities with recalibrated severity weights. Whereas the CCI did not discriminate for survival, the mCCI-KT provided significant discrimination for survival using the Kaplan-Meier method and Cox regression analysis. The mCCI-KT showed modest increases in c-statistics (0.54 vs 0.52, P = .001) and improved net mortality risk reclassification by 16.3% (95% confidence interval, 3.2-29.4; P = .015) relative to the CCI. CONCLUSION: The mCCI-KT stratifies the risk for mortality in renal allograft recipients better than the CCI, suggesting that it may be a preferred index for use in clinical practice.


Asunto(s)
Comorbilidad , Trasplante de Riñón/mortalidad , Anciano , Estudios de Cohortes , Femenino , Humanos , Masculino , Persona de Mediana Edad , Modelos de Riesgos Proporcionales , Trasplante Homólogo
14.
J Eur Acad Dermatol Venereol ; 32(9): 1499-1506, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-29430733

RESUMEN

BACKGROUND: Psychological aspect and quality of life should be considered in treating patients with psoriasis. OBJECTIVE: We sought to ascertain which clinical characteristics including presence of exposed lesions are associated with impairment of health-related quality of life (HRQoL) in patients with psoriasis. METHODS: The EPI-PSODE study was a nationwide, multicenter, cross-sectional study conducted in Korea that included 1260 adult patients with psoriasis. In addition to clinical characteristics including presence of exposed lesions, data were collected using the Psoriatic Arthritis (PsA) Screening and Evaluation (PASE), Dermatology Life Quality Index (DLQI), MOS 36-Item Short-Form Health Survey (SF-36), Work Productivity and Activity Impairment Questionnaire Psoriasis (WPAI: PSO) and Medication Satisfaction Questionnaire (MSQ). RESULTS: Patients with a DLQI score > 5 (n = 990) were younger, had an earlier onset of psoriasis, scored higher on the Psoriasis Area and Severity Index (PASI), had higher body surface area (BSA) and had higher PASE scores than patients with DLQI ≤ 5 (n = 266). The group of patients with exposed lesions (n = 871) were younger and male predominance, earlier onset of psoriasis, longer disease duration, higher PASI/BSA score and a higher proportion with drinking and smoking history each than the group of patients without exposed lesions (n = 389). Presence of exposed lesions negatively influenced DLQI, 36-Item Short-Form Health Survey (SF-36) (mental component), presenteeism, total work productivity impairment and total activity impairment in the WPAI: PSO. In multiple regression model, PASI score was the only variable which was significantly associated with all HRQoL measures. Presence of exposed lesions was a significant factor affecting DLQI and SF-36 (mental). CONCLUSION: The presence of exposed lesions has a negative impact on quality of life, mental health and work productivity. Therefore, effective treatments are particularly needed for psoriasis patients with exposed lesions.


Asunto(s)
Psoriasis/psicología , Calidad de Vida , Adulto , Edad de Inicio , Consumo de Bebidas Alcohólicas/epidemiología , Artritis Psoriásica/diagnóstico , Superficie Corporal , Estudios Transversales , Eficiencia , Femenino , Humanos , Masculino , Persona de Mediana Edad , Presentismo , Psoriasis/epidemiología , República de Corea/epidemiología , Índice de Severidad de la Enfermedad , Factores Sexuales , Fumar/epidemiología , Encuestas y Cuestionarios
15.
Genes Brain Behav ; 17(2): 126-138, 2018 02.
Artículo en Inglés | MEDLINE | ID: mdl-28834604

RESUMEN

Metabolic diseases affect various organs including the brain. Accumulation or depletion of substrates frequently leads to brain injury and dysfunction. Deficiency of aminopeptidase P1, a cytosolic proline-specific peptidase encoded by the Xpnpep1 gene, causes an inborn error of metabolism (IEM) characterized by peptiduria in humans. We previously reported that knockout of aminopeptidase P1 in mice causes neurodevelopmental disorders and peptiduria. However, little is known about the pathophysiological role of aminopeptidase P1 in the brain. Here, we show that loss of aminopeptidase P1 causes behavioral and neurological deficits in mice. Mice deficient in aminopeptidase P1 (Xpnpep1-/- ) display abnormally enhanced locomotor activities in both the home cage and open-field box. The aminopeptidase P1 deficiency in mice also resulted in severe impairments in novel-object recognition, the Morris water maze task, and contextual, but not cued, fear memory. These behavioral dysfunctions were accompanied by epileptiform electroencephalogram activity and neurodegeneration in the hippocampus. However, mice with a heterozygous mutation for aminopeptidase P1 (Xpnpep1+/- ) exhibited normal behaviors and brain structure. These results suggest that loss of aminopeptidase P1 leads to behavioral, cognitive and neurological deficits. This study may provide insight into new pathogenic mechanisms for brain dysfunction related to IEMs.


Asunto(s)
Aminopeptidasas/deficiencia , Conducta Animal/fisiología , Disfunción Cognitiva/fisiopatología , Hipocampo/fisiopatología , Animales , Cognición/fisiología , Disfunción Cognitiva/genética , Aprendizaje por Laberinto/fisiología , Memoria/fisiología , Trastornos de la Memoria/metabolismo , Ratones Transgénicos
17.
Annu Int Conf IEEE Eng Med Biol Soc ; 2017: 1962-1965, 2017 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29060278

RESUMEN

A temporary dental implant is a medical device which is temporarily used to support a prosthesis such as an artificial tooth used for restoring patient's masticatory function during implant treatment. It is implanted in the oral cavity to substitute for the role of tooth. Due to the aging and westernization of current Korean society, the number of tooth extraction and implantation procedures is increasing, leading to an increase in the use and development of temporary dental implants. Because an implant performs a masticatory function in place of a tooth, a dynamic load is repeatedly put on the implant. Thus, the fatigue of implants is reported to be the most common causes of the fracture thereof. According to the investigation and analysis of the current domestic and international standards, the standard for fatigue of implant fixtures is not separately specified. Although a test method for measuring the fatigue is suggested in an ISO standard, it is a standard for permanent dental implants. Most of the test standards for Korean manufacturers and importers apply 250 N or more based on the guidance for the safety and performance evaluation of dental implants. Therefore, this study is intended to figure out the fatigue standard which can be applied to temporary dental implants when measuring the fatigue according to the test method suggested in the permanent dental implant standard. The results determined that suitable fatigue standards of temporary dental implants should be provided by each manufacturer rather than applying 250 N. This study will be useful for the establishment of the fatigue standards and fatigue test methods of the manufacturers and importers of temporary dental implants.


Asunto(s)
Implantes Dentales , Implantación Dental Endoósea , Implantes Dentales de Diente Único , Fracaso de la Restauración Dental , Humanos
18.
Tech Coloproctol ; 21(5): 345-353, 2017 May.
Artículo en Inglés | MEDLINE | ID: mdl-28567691

RESUMEN

PURPOSE: Injection of adipose tissue-derived stem cells (ASCs) is a novel method for the treatment of complex perianal fistulas. We aimed to evaluate the safety and efficacy of ASCs in the treatment of complex anal fistulas not associated with Crohn's disease. METHODS: A phase II clinical trial was performed comparing two different doses of ASCs (group 1: 1 × 107 cells/mL and group 2: 2 × 107 cells/mL). Eligible patients were administered an amount of ASCs proportional to the length of the fistula by injection into the submucosal layer surrounding the internal opening and inside of the fistula tract. ASCs at twice the initial concentration were administered if complete closure was not achieved within 8 weeks. The efficacy endpoint was the complete closure of fistulas 8 weeks after injection. Patients demonstrating complete closure at week 8 were subjected to follow-up for 6 months. RESULTS: Fifteen patients were injected with ASCs; thirteen completed the study. Complete closure was observed in 69.2% (9/13) of patients at 8 weeks. Three of five patients in group 1, and six of eight in group 2 displayed complete closure; no significant differences were observed between the groups. Six of nine patients who showed complete closure participated in additional follow-up; five (83.3%) showed persistent response at 6 months. No grade 3 or 4 adverse events (AEs) were observed; observed AEs were not related to ASC treatment. CONCLUSION: ASCs might be a good option for the treatment of complex perianal fistulas are not healed by conventional operative procedures.


Asunto(s)
Adipocitos/trasplante , Tejido Adiposo/citología , Fístula Rectal/terapia , Trasplante de Células Madre/métodos , Adulto , Humanos , Masculino , Persona de Mediana Edad , Fístula Rectal/etiología , Resultado del Tratamiento , Adulto Joven
19.
Acta Anaesthesiol Scand ; 61(6): 668-675, 2017 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-28573655

RESUMEN

BACKGROUND: This study investigated whether pain and pain-related unpleasantness ratings were altered by blood testosterone levels. We also investigated whether activation of brain regions that represent pain intensity [primary somatosensory cortex (S1)] and pain-related unpleasantness [perigenual ACC (pACC) and orbitofrontal cortex (OFC)] were affected by blood testosterone levels. METHODS: Twenty-six healthy men were recruited. Blood testosterone levels were measured before fMRI scanning. The participants were classified into two groups (high vs. low testosterone) according to their blood testosterone level (each group n = 13). The middle finger was immersed in a 50°C water bath (50°C, 30 s, five times) to induce identical noxious stimulation in all participants. RESULTS: The low testosterone group showed statistically significantly higher pain (P = 0.047), unpleasantness (P = 0.047), anxiety (P = 0.015), and fear ratings (P = 0.01) than the high testosterone group. Fear rating increased as pain rating rose and as testosterone level decreased (P < 0.001). When participants received noxious stimulation, the pACC and OFC were more highly activated in the low testosterone group compared to the high testosterone group. Activation of S1, a region related to pain intensity, did not differ between both groups. CONCLUSION: Compared to the high testosterone group, the low testosterone group had significant activation in the pACC and OFC, regions that represent pain-related unpleasantness, but not in S1 that represents pain intensity, leading to higher pain ratings. These findings emphasize the importance of considering the effects of testosterone levels when treating patients.


Asunto(s)
Encéfalo/fisiopatología , Dolor/psicología , Testosterona/sangre , Adulto , Corteza Cerebral/fisiopatología , Miedo/psicología , Voluntarios Sanos , Calor , Humanos , Imagen por Resonancia Magnética , Masculino , Dolor/fisiopatología , Dimensión del Dolor , Corteza Prefrontal/fisiopatología , Corteza Somatosensorial/fisiopatología , Adulto Joven
20.
Transplant Proc ; 49(5): 982-986, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28583572

RESUMEN

PURPOSE: Our objective was to investigate the effects of age on patient and graft survival in expanded criteria donor (ECD) renal transplantation. METHODS: Between February 2000 and December 2015, we analyzed 405 deceased donor renal transplants, including 128 grafts (31.9%) from ECDs. Based on recipient age and ECD criteria classification, the recipients were divided into four groups: Group I, non-ECD to recipient age <50 years; Group II, non-ECD to recipient age ≥50 years; Group III, ECD to recipient age <50 years; and Group IV, ECD to recipient age ≥50 years. RESULTS: Among the four groups, there were significant differences in baseline characteristics (age, body mass index [BMI], cause of end-stage renal disease [ESRD], number of kidney transplantations, and use of induction agent). The mean modification of diet in renal disease (MDRD) glomerular filtration rate (GFR) level at 1 month, 6 months, 1 year, 3 years, and 5 years after transplantation was significantly lower in patients with ECDs but MDRD GFR level at 7, 9, and 10 years did not differ significantly (P = .183, .041, and .388, respectively). There were no significant differences in graft survival (P = .400) and patient survival (P = .147). CONCLUSION: Our result shows that, regardless of recipient age, kidney transplants donated by deceased ECDs have similar graft and patient survival.


Asunto(s)
Factores de Edad , Supervivencia de Injerto , Trasplante de Riñón/métodos , Donantes de Tejidos , Adulto , Femenino , Humanos , Fallo Renal Crónico/cirugía , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Resultado del Tratamiento
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