Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 33
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Eur Rev Med Pharmacol Sci ; 27(21): 10620-10630, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37975387

RESUMO

OBJECTIVE: The aim of this study was to evaluate fetal modified myocardial performance index (mod-MPI) and fetal epicardial fat tissue (EFT) thickness and its association with adverse perinatal outcomes in diabetic pregnant women. PATIENTS AND METHODS: This was a prospective case-control study including 90 gestational diabetes mellitus (GDM) and 45 pregestational diabetes mellitus (PGDM) and 90 healthy pregnant women (control group). Two-dimensional gray-scale and Doppler fetal echocardiography were used to calculate the mod-MPI. EFT thickness was measured in the hypoechogenic area between the myocardium and the visceral pericardium on the right ventricle by distinguishing it from the pericardial fluid by Doppler ultrasound. RESULTS: Both mod-MPI values and EFT thickness were significantly higher in diabetic pregnant women (p<0.001; for both). No significant differences were observed in mod-MPI values and EFT thickness between pregnant women with GDM and PGDM. In addition, there was no significant difference in fetal mod-MPI values and EFT thicknesses among diabetic pregnant women based on their treatment requirements. The receiver operating characteristic (ROC) curve revealed that mod-MPI value (cut-off 0.54, 95% CI: 0.629-0.837, p<0.001, sensitivity 64.6%, specificity 61.7%) and EFT thickness (cut-off 1.85 mm, 95% CI: 0.524-0.750, p=0.014, sensitivity 65.8%, specificity 63.9%) could predict adverse neonatal outcomes in diabetic pregnant women. Multivariate regression analysis revealed that both mod-MPI (p=0.003) and EFT thickness (p=0.008) were independently associated with adverse outcomes. CONCLUSIONS: Fetal mod-MPI values and EFT thickness increase in pregnancies complicated by diabetes, and these measurements may serve as valuable predictors of adverse perinatal outcomes.


Assuntos
Diabetes Gestacional , Complicações na Gravidez , Recém-Nascido , Gravidez , Feminino , Humanos , Estudos de Casos e Controles , Coração Fetal/diagnóstico por imagem , Ecocardiografia Doppler/métodos , Pericárdio/diagnóstico por imagem , Ultrassonografia Pré-Natal/métodos
2.
Eur J Paediatr Dent ; 24(4): 277 - 280, 2023 12 01.
Artigo em Inglês | MEDLINE | ID: mdl-37337965

RESUMO

AIM: The aim of the present study is to evaluate the relationship between sequential visits in dental caries treatments and dental anxiety levels of paediatric patients through the use of anxiety scales and physiological measurements. METHODS: A total of 224 children aged 5-8 years who needed at least two bilateral restorative dental caries treatments of the mandibular first primary molar was included in the study. The treatment duration was approximately 20 minutes and time span between the two appointments was a maximum of two weeks. The Wong-Baker FACES Pain Rating Scale (WBFPS) and The Modified Dental Anxiety Scale (MDAS) were used for subjective measurements and the objective measurement of dental anxiety was performed by measuring the heart rate using a portable pulse oximeter. Statistical analysis was carried out using the Statistical Package for the Social Sciences version 22 (IBM corp. Armonk, NY, USA). RESULTS: Out of the 224 children, 117 were girls (mean age 6.4 ± 1.1 years) and 107 were boys (mean age 6.1 ± 1.2 years). The mean age of the patients was 6.26 ± 1.147 years, ranging from 5 to 8. There were no statistical significant differences between children's age and genders with dental anxiety. However, there were statistical significant differences for the variables regarding the sequential visits. When comparing the MDAS scores statistically significant differences were observed between the first and second visits (p<0.001). Both preoperative and postoperative WBFPS scores were significantly higher at the first visit than at the second visit. Statistically significant differences were observed in the heart rate scores between the treatment sessions (p<0.001). CONCLUSION: The results of this study show a significant reduction in dental anxiety after sequental dental visits in children aged 5-8 years, which highlights the importance of the sequental visits in paediatric dentistry.


Assuntos
Ansiedade ao Tratamento Odontológico , Cárie Dentária , Criança , Humanos , Cárie Dentária/terapia , Odontopediatria , Assistência Odontológica , Dente Molar
5.
Bioinformatics ; 36(8): 2620-2622, 2020 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-31904823

RESUMO

MOTIVATION: CellDesigner is a well-established biological map editor used in many large-scale scientific efforts. However, the interoperability between the Systems Biology Graphical Notation (SBGN) Markup Language (SBGN-ML) and the CellDesigner's proprietary Systems Biology Markup Language (SBML) extension formats remains a challenge due to the proprietary extensions used in CellDesigner files. RESULTS: We introduce a library named cd2sbgnml and an associated web service for bidirectional conversion between CellDesigner's proprietary SBML extension and SBGN-ML formats. We discuss the functionality of the cd2sbgnml converter, which was successfully used for the translation of comprehensive large-scale diagrams such as the RECON Human Metabolic network and the complete Atlas of Cancer Signalling Network, from the CellDesigner file format into SBGN-ML. AVAILABILITY AND IMPLEMENTATION: The cd2sbgnml conversion library and the web service were developed in Java, and distributed under the GNU Lesser General Public License v3.0. The sources along with a set of examples are available on GitHub (https://github.com/sbgn/cd2sbgnml and https://github.com/sbgn/cd2sbgnml-webservice, respectively). SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.


Assuntos
Software , Biologia de Sistemas , Humanos , Redes e Vias Metabólicas , Transdução de Sinais
6.
J Orthop Surg Res ; 13(1): 207, 2018 Aug 22.
Artigo em Inglês | MEDLINE | ID: mdl-30134930

RESUMO

BACKGROUND: The purpose of this study was to assess the impact of uniform anti-rotational proximal femoral intramedullary nail (APFN) use on patient mobility status with the treatment of two different unstable intertrochanteric femur fracture groups of geriatric patients. METHODS: The study included patients aged > 65 years who underwent surgery with APFN. Group 1 comprised AO classification, AO/OTA 31-A22, and A23 patients, and group 2, A31 and A32 patients. The demographic data of the patients, postoperative complications, follow-up, mortality status, postoperative reduction, tip-apex distance (TAD), and the Parker-Palmer mobility (PPM) score were evaluated. RESULTS: There were no statistically significant differences between the groups in terms of gender, affected side, time from trauma to surgery, ASA score, anesthesia type, duration of hospitalization, duration of surgery, TAD values, reduction values, or mortality rate. The average age of patients in group 2 was significantly higher than that of patients in group 1 (p < 0.05). The mobility scores of group 1 patients were significantly higher than those of group 2 (p < 0.05). CONCLUSIONS: While no relationship was found between the TAD values and the reduction status of the cases, the PPM scores of the AO 31 A3 cases were determined to be significantly worse. Therefore, fractures with a preoperative classification of AO type 31 A3 can be expected to have worse results than A2 ITF fractures. The fracture type seems to have as great an effect as other factors on the postoperative mobility score.


Assuntos
Fixação Intramedular de Fraturas/métodos , Fraturas do Quadril/cirurgia , Limitação da Mobilidade , Idoso , Idoso de 80 Anos ou mais , Pinos Ortopédicos , Avaliação da Deficiência , Feminino , Avaliação Geriátrica , Fraturas do Quadril/classificação , Fraturas do Quadril/patologia , Humanos , Masculino , Resultado do Tratamento
7.
West Indian Med J ; 64(4): 393-6, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26624593

RESUMO

OBJECTIVE: This paper deals with the investigation of the effects of nasal septal deviation evaluated by acoustic rhinometry (ARM) in the success of tympanoplasty surgery. SUBJECT AND METHODS: All patients who underwent tympanoplasty surgery by the same surgeon were reviewed. The patients with nasopharyngeal or nasal masses, polyps, symptoms of allergic rhinitis or rhinosinusitis, or concha bullosa were excluded from the study. Forty patients who underwent tympanoplasty at least one year ago were included in the study. The patients were divided into two groups according to the graft success results. Acoustic rhinometry evaluations of the patients were performed. RESULTS: There were 25 and 15 cases in the intact graft (group A) and re-perforated group (group B), respectively. For the same side of the operated ear, ARM values of group A were 0.47 cm², at the first narrowest cross-sectional area (MCA 1), 0.43 cm² at the second narrowest cross-sectional area (MCA 2), 1.51 cm³ volume at the first 2 cm of the nasal cavity (Vol 1) and 3.33 cm³ volume between the second and fifth cm of the nasal cavity (Vol 2). Acoustic rhinometry values of group B were 0.50 cm², 0.47 cm², 1.60 cm³ and 3.19 cm³ for MCA 1, MCA 2, Vol 1 and Vol 2, respectively. CONCLUSION: The results of this study showed that nasal septal deviation may not affect the success of tympanoplasty surgery, and septoplasty may not be necessary before ear surgery.

8.
Clin Exp Dermatol ; 39(4): 433-8, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-24758305

RESUMO

BACKGROUND: Body dysmorphic disorder (BDD) is a distressing and impairing preoccupation with a slight or imagined defect in appearance. There are few reports on the prevalence of BDD in the Turkish population. AIM: To investigate the frequency of BDD in dermatology settings, and to compare the results from cosmetic dermatology with those from general dermatology settings. METHODS: This cross-sectional study recruited 400 patients from cosmetic dermatology (CD) (n = 200) and general dermatology (GD) clinics (n = 200). A mini-survey was used to collect demographic and clinical characteristics, and the dermatology version of a brief self-report BDD screening questionnaire was administered. A five-point Likert scale was used for objective scoring of the stated concern, which was performed by dermatologists, and patients who scored ≥ 3 were excluded from the study. RESULTS: In total, 318 patients (151 in the CD group and 167 in the GD group) completed the study, and of these, 20 were diagnosed with BDD. The CD group had a higher rate of BDD (8.6%) than the GD group (4.2%) but this was not significant (P = 0.082). The major concern focused on body and weight (40.0%), followed by acne (25.0%). CONCLUSIONS: The number of cosmetic procedures in dermatology practices is increasing Therefore, it is becoming more important to recognize patients with BDD. Although the rates of BDD found in the present study are in agreement with the literature data, population-based differences still exist between this study and previous studies.


Assuntos
Transtornos Dismórficos Corporais/epidemiologia , Dermatologia/estatística & dados numéricos , Adolescente , Adulto , Instituições de Assistência Ambulatorial/estatística & dados numéricos , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prevalência , Cirurgia Plástica/estatística & dados numéricos , Turquia/epidemiologia , Adulto Jovem
9.
J BUON ; 18(2): 377-84, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23818349

RESUMO

PURPOSE: To retrospectively assess the efficacy and toxity of a modified docetaxel, cisplatin, fluorouracil (mDCF) regimen as primary treatment in patients with metastatic gastric cancer (MGC). METHODS: mDCF included folinic acid 400 mg/m(2) (day 1) + 5-fluorouracil (5-FU) 400 mg/m(2) i.v. bolus (day 1) + 5-FU 2400 mg/m(2) 46-h infusion (days 1 and 2) + docetaxel 60 mg/m(2) (day 1) + cisplatin 50 mg/m(2) (day 1) and was administered once every two weeks in MGC patients. RESULTS: Eighty-nine patients (median age 59 years, range 31-79) were enrolled. The median number of courses was 6 (range 2-12), and the total number was 492. The median follow-up duration was 8.6 months (range 2-14). Three (3.3%) patients showed complete response, 21 (23.6%) partial response, 36 (40.4%) stable disease, and progression was observed in 29 (32.6%) patients. The median progression- free survival (PFS) rate was 7 months (95% CI 5.7-8.2), and the median overall survival (OS) rate was 11 months (95% CI 9.7-12.2). The most common toxicity was neutropenia, which was observed in 52 (58.4%) patients. CONCLUSION: mDCF with reduced drug doses, given every two weeks, is a rather efficient regimen for MGC patients.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Carcinoma/tratamento farmacológico , Neoplasias Gástricas/tratamento farmacológico , Adulto , Idoso , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Carcinoma/mortalidade , Carcinoma/secundário , Distribuição de Qui-Quadrado , Cisplatino/administração & dosagem , Progressão da Doença , Intervalo Livre de Doença , Docetaxel , Esquema de Medicação , Feminino , Fluoruracila/administração & dosagem , Humanos , Estimativa de Kaplan-Meier , Leucovorina/administração & dosagem , Masculino , Pessoa de Meia-Idade , Neutropenia/induzido quimicamente , Estudos Retrospectivos , Neoplasias Gástricas/mortalidade , Neoplasias Gástricas/patologia , Taxoides/administração & dosagem , Fatores de Tempo , Resultado do Tratamento
10.
Bratisl Lek Listy ; 113(6): 376-8, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22693976

RESUMO

OBJECTIVES: This study was designed to assess the effects of exercise on the portal venous system in splenectomized adults. BACKGROUND: Splenectomy is a surgical intervention commonly performed at surgery clinics and recognized as a cause of portal vein thrombosis. Intensive exercise increases blood flow to the contracting muscles, causes hypercoagulability and vasoconstriction in the splanchnic area, hence the portal vein diameter, blood flow velocity and discharge decrease. METHODS: Forty adults participated in this investigation. Subjects were trained to run for twenty minutes on a treadmill at a velocity of 6 km/h and ten-degree elevation. We compared the white blood cell count, portal vein diameter, portal venous blood flow velocity and discharge of splenectomized and healthy adults before and after exercise. RESULTS: After exercise, the blood leukocyte count was significantly increased and the portal vein diameter was significantly reduced in both groups (p<0.001) but there were no statistically significant differences between the two groups. The portal venous blood flow rate in splenectomy group were significantly lower than in the control group (p<0.001). Furthermore the portal venous blood flow rates in both groups were significantly reduced after exercise (p<0.001). CONCLUSION: Exercise in splenectomized individuals can cause serious problems in form of decreasing splanchnic flow and increasing blood viscosity. After splenectomy, both healthy individuals and patients with hematologic diseases ought to avoid intensive exercises (Tab. 2, Ref. 16).


Assuntos
Velocidade do Fluxo Sanguíneo , Exercício Físico , Veia Porta/diagnóstico por imagem , Esplenectomia , Adulto , Temperatura Corporal , Feminino , Humanos , Contagem de Leucócitos , Masculino , Veia Porta/fisiopatologia , Circulação Esplâncnica , Ultrassonografia
11.
J Cardiovasc Surg (Torino) ; 50(4): 527-30, 2009 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18948875

RESUMO

Coarctation of the abdominal aorta is a rare pathology. Stenosis of visceral and renal arteries may present together with coarctation, which requires specific operation techniques. We present the case of a patient with coarctation of the abdominal aorta associated with stenosis of the celiac trunk, the superior mesenteric and the right renal arteries. Distal aortic perfusion by extracorporeal circulation and selective right renal perfusion techniques were used during the operation to protect the spinal cord and kidney against hypoperfusion and ischemia.


Assuntos
Aorta Abdominal/cirurgia , Coartação Aórtica/cirurgia , Implante de Prótese Vascular , Circulação Extracorpórea , Oclusão Vascular Mesentérica/cirurgia , Perfusão , Obstrução da Artéria Renal/cirurgia , Circulação Renal , Adolescente , Aorta Abdominal/patologia , Aorta Abdominal/fisiopatologia , Coartação Aórtica/complicações , Coartação Aórtica/diagnóstico , Coartação Aórtica/fisiopatologia , Aortografia/métodos , Humanos , Angiografia por Ressonância Magnética , Masculino , Oclusão Vascular Mesentérica/complicações , Oclusão Vascular Mesentérica/diagnóstico , Oclusão Vascular Mesentérica/fisiopatologia , Obstrução da Artéria Renal/complicações , Obstrução da Artéria Renal/diagnóstico , Obstrução da Artéria Renal/fisiopatologia , Tomografia Computadorizada por Raios X , Resultado do Tratamento
12.
Clin Exp Dermatol ; 34(4): 476-80, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19040510

RESUMO

BACKGROUND: The main cause of lichen simplex chronicus (LSC) is not known but there is evidence to suggest that neurological abnormalities may be implicated in its aetiology. AIM: To investigate neuropathy in patients with LSC on the limbs. METHODS: In total, 23 consecutive patients [15 women (65.2%) and 8 men (34.8%); mean +/- SD age 48.2 +/- 14.03 years, range 20-71] with LSC on the limbs were included in the study. Mean +/- SD duration of disease was 22.86 +/- 21.38 months (range 1-60). Radiography, magnetic resonance imaging (MRI) and electrophysiological studies were performed for all patients. RESULTS: In total, 8 patients (34.8%) had LSC on the arms and 15 patients (65.2%) had LSC on the legs; 3 (37.5%) of the 8 patients with LSC on the arms and 6 (40%) of the 15 patients with LSC on the legs had radiculopathy in the electrophysiological studies. The prevalence of radiculopathy in patients with LSC on the limbs was higher than in asymptomatic subjects in the electrophysiological studies. CONCLUSIONS: Damage to the peripheral nervous system, such as radiculopathy and neuropathy, can play a critical role in the aetiology of LSC on the limbs. Both nerve-root compression in MRI scans and radiculopathy in nerve-conduction studies are common findings in asymptomatic subjects, but they seem to be more common in patients with LSC on the limbs. Therefore, these patients should be evaluated for the possibility of underlying neuropathy.


Assuntos
Mononeuropatias/complicações , Neurodermatite/etiologia , Prurido/etiologia , Radiculopatia/complicações , Adulto , Idoso , Braço , Eletrofisiologia , Feminino , Humanos , Perna (Membro) , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Mononeuropatias/fisiopatologia , Condução Nervosa/fisiologia , Neurodermatite/fisiopatologia , Prurido/fisiopatologia , Radiculopatia/fisiopatologia , Adulto Jovem
13.
Neuroradiol J ; 22(1): 72-7, 2009 Mar 23.
Artigo em Inglês | MEDLINE | ID: mdl-24206955

RESUMO

Intracranial metastases represent 7% to 17% of all brain tumors. Metastases may appear before, after or synchronously with the primary tumor. Synchronous tumor presentation means that that metastasis is found within two months of primary tumor diagnosis. A 60-year-old man was seen 15 days after the acute onset of confusion and gait disturbance. Results of a neurologic examination revealed disorientation, dysarthria, and left-sided ataxia. Results of nonenhanced computed tomography scanning of the brain were unremarkable. Cerebral magnetic resonance imaging showed multiple miliary, round, small (maximum diameter, 1 cm) lesions located infra- and supratentorially. Gradient-echo magnetic resonance images of these lesions were compatible with hemorrhage and were more pronounced compared with other sequences. Hemorrhagic cerebral metastases were suspected, and the patient was examined for primary tumors. Chest computerized tomography revealed a tumor in the posterior, superior lobe of the right lung; a cervical lymph node biopsy suggested a metastatic carcinoma. Our case illustrates that magnetic resonance imaging findings of synchronous cerebral multiple metastases presenting with neurologic symptoms may be atypical while the results of cerebral computerized tomography are normal. Contrast-enhanced cerebral magnetic resonance imaging, especially gradient-echo magnetic resonance sequences, should always be considered for diagnosing hemorrhagic metastases in patients presenting neurologic findings with a known or unknown cancer.

15.
J Hazard Mater ; 128(2-3): 273-9, 2006 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-16202518

RESUMO

This study explored the feasibility of utilizing raw and calcinated dolomite under CO2 atmosphere for phosphate removal in laboratory experiments. The experimental work emphasized the evaluation of phosphate adsorption characteristics of this adsorbent material. Studies were conducted to delineate the effect of contact time, initial phosphate concentration, temperature, pH, stirring speed, adsorbent dose and calcination temperature. Phosphate removal decreased with increasing temperature and slightly increased with increasing of pH. The observed decrease in the adsorption capacity with increase of the temperature from 20 to 40 and to 60 degrees C indicates that the low temperatures favor the phosphate removal by adsorption onto dolomite. Phosphate removal was seen to decrease with increasing calcination temperature due to the structural changes occurring in the structure and pore size distribution of dolomite samples during calcination. The experimental data obtained were applied to the Freundlich, Langmuir, BET, Halsey, Harkins-Jura, Smith and Henderson isotherm equations to test the fit of these equations to raw and calcinated dolomite samples. By considering the experimental results and adsorption models applied in this study, it can be concluded that adsorption of phosphate occurs predominantly through physical interactions, and the dolomite sample has a heteroporous structure. The large values of the constants for Henderson equation and the high value of y(m) obtained from BET equation indicate the microporous structure is more stable in raw and calcinated dolomite samples.


Assuntos
Carbonato de Cálcio , Resíduos Industriais/prevenção & controle , Magnésio , Fosfatos/isolamento & purificação , Água/química , Adsorção , Cálcio , Estudos de Viabilidade , Concentração de Íons de Hidrogênio , Cinética , Concentração Osmolar , Temperatura
16.
Clin Exp Dermatol ; 31(1): 30-2, 2006 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16309474

RESUMO

Port-wine stains are frequently seen congenital vascular malformations consisting of ectatic dermal capillaries. Acquired port-wine stain that develops later in life is an uncommon vascular lesion that is morphologically identical to a congenital port-wine stain. In the majority of acquired port-wine stains, the aetiology is unknown, but trauma is an important causative factor. Other proposed aetiologies include chronic sun exposure, hormonal changes, frostbite injury, obstruction of the peritoneovenous shunt, herpes zoster infection, and cerebral arteriovenous malformation. Here we report the first case of a patient who had an acquired port-wine stain related to a solid brain tumour.


Assuntos
Neuroma Acústico/complicações , Mancha Vinho do Porto/etiologia , Adulto , Ângulo Cerebelopontino/patologia , Eritema/etiologia , Eritema/patologia , Feminino , Humanos , Imageamento por Ressonância Magnética , Neuroma Acústico/patologia , Mancha Vinho do Porto/patologia , Pele/patologia , Telangiectasia/etiologia , Telangiectasia/patologia
17.
J Hazard Mater ; 131(1-3): 254-9, 2006 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-16263211

RESUMO

An activated carbon was developed from Rosa canina sp. seeds, characterized and used for the removal of methylene blue (basic dye) from aqueous solutions. Adsorption studies were carried out at 20 degrees C and various initial dye concentrations (20, 40, 60, 80, and 100 mg/L) for different times (15, 30, 60, and 120 min). The adsorption isotherm was obtained from data. The results indicate that the adsorption isotherm of methylene blue is typically S-shaped. The shape of isotherm is believed to reflect three distinct modes of adsorption. In region 1, the adsorption of methylene blue is carried out mainly by ion exchange. In region 2 by polarizations of pi-electrons established at cyclic parts of the previously adsorbed methylene blue molecules is occurred. However, it is not observed any change at the sign of the surface charge although zeta potential value is decreased with increase of amount adsorbed. In region 3, the slope of the isotherm is reduced, because adsorption now must overcome electrostatic repulsion between oncoming ions and the similarly charged solid. Adsorption in this fashion is usually complete when the surface is covered with a monolayer of methylene blue. To reveal the adsorptive characteristics of the produced active carbon, porosity and BET surface area measurements were made. Structural analysis was performed using SEM-EDS. The produced active carbon has the specific surface area of 799.2 m2 g-1 and the iodine number of 495 mg/g.


Assuntos
Carbono/química , Azul de Metileno/farmacocinética , Eliminação de Resíduos Líquidos/métodos , Purificação da Água/métodos , Adsorção , Agricultura , Resíduos Industriais , Sementes , Relação Estrutura-Atividade
18.
J Hazard Mater ; 131(1-3): 217-28, 2006 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-16257117

RESUMO

In this study, adsorption kinetics of a cationic dye, methylene blue, onto clay from aqueous solution with respect to the initial dye concentration, temperature, pH, mixing rate and sorbent dosage were investigated. In order to understand the adsorption mechanism in detail, zeta potentials and the conductivities of clay suspensions at various pH (1-11) and cation exchange capacity (CEC) were measured. Porosity and BET surface area of clay studied were determined. The results showed that the adsorption has been reached to equilibrium in 1 h. It was found that the amount adsorbed of methylene blue increases with decreasing temperature and also with increasing both sorbent dosage and increasing initial dye concentration. Adsorption capacity decreases with increasing pH, except for the natural pH (5.6) of clay suspensions. The adsorption kinetics of methylene blue has been studied in terms of pseudo-first-order, pseudo-second-order sorption and intraparticle diffusion processes thus comparing chemical sorption and diffusion sorption processes. It was found that the pseudo-second-order mechanism is predominant and the overall rate of the dye adsorption process appears to be controlled by the more than one-step.


Assuntos
Silicatos de Alumínio , Inibidores Enzimáticos/farmacocinética , Azul de Metileno/farmacocinética , Adsorção , Argila , Concentração de Íons de Hidrogênio , Porosidade , Temperatura
19.
Neuroradiol J ; 19(5): 609-15, 2006 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-24351263

RESUMO

Although nervous system involvement is common in thrombotic thrombocytopenic purpura (TTP), abnormalities on computerized tomography, magnetic resonance imaging and electroencephalography are not encountered so frequently and if present, these abnormalities are often reversible. We describe a 39-year-old woman with recurring transient focal neurological findings found to have laboratory findings consistent with TTP. In cerebral diffusion weighted images (DWI), diffuse cortical hyperintensity was noted in right frontal lobe, but the ADC (apparent diffusion coefficient) map was normal. Electroencephalography demonstrated lateralized slowing and repeated DWI showed diffuse cortical hyperintensity in the right hemisphere. SPECT showed luxury perfusion in the right hemisphere areas. The patient's condition resolved with plasmapheresis. Our patient illustrates that diffuse hemispheric involvement can be seen in DWI and EEG, and SPECT may show luxury perfusion after resolution of neurological findings in TTP cases. To our knowledge, this is the first TTP case in which the ADC map was normal.

20.
Acta Neurol Belg ; 105(4): 201-5, 2005 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-16482869

RESUMO

Mucormycosis is a rare fungal infection that can involve the sino-orbito-cerebral region. Sino-orbito-cerebral mucormycosis is most common in patients who are immunocompromised or have diabetes mellitus, severe malnutrition or burns. This condition can be fatal if it is not diagnosed early and treated aggressively. This article presents 4 cases of mucormycosis, including 2 with orbital apex syndrome, 1 with cavernous sinus syndrome, and 1 with multiple cranial nerve involvement. All of the patients were presented with painful ophthalmoplegia. The predisposing factors for mucormycosis included diabetes mellitus (three patients) and chronic leukemia (one patient). In all cases, mucormycosis was diagnosed by examining endoscopic sinus drainage material and was treated with surgical debridement and amphotericin B. Two patients with central nervous system involvement died. The others have survived, but still exhibiting various neurologic abnormalities after aggressive treatment. Patients with mucormycosis rarely present with orbital apex syndrome. The possibility of mucormycosis should be investigated in any patient with painful ophthalmoplegia, and prompt otorhinolaryngologic examination is recommended to ensure rapid diagnosis and treatment.


Assuntos
Mucormicose/fisiopatologia , Oftalmoplegia/microbiologia , Idoso , Anfotericina B/uso terapêutico , Antifúngicos/uso terapêutico , Seio Cavernoso/microbiologia , Infecções Fúngicas do Sistema Nervoso Central/tratamento farmacológico , Infecções Fúngicas do Sistema Nervoso Central/microbiologia , Doença Crônica , Doenças dos Nervos Cranianos/tratamento farmacológico , Doenças dos Nervos Cranianos/microbiologia , Desbridamento , Complicações do Diabetes , Feminino , Humanos , Leucemia/complicações , Masculino , Pessoa de Meia-Idade , Mucormicose/terapia , Doenças Orbitárias/microbiologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...