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1.
Eur J Neurol ; 28(2): 525-531, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-32986293

RESUMO

BACKGROUND AND PURPOSE: Head down tilt 15° (HDT15°), applied before recanalization, increases collateral flow and improves outcome in experimental ischemic stroke. For its simplicity and low cost, HDT15° holds considerable potential to be developed as an emergency treatment of acute stroke in the prehospital setting, where hemorrhagic stroke is the major mimic of ischemic stroke. In this study, we assessed safety of HDT15° in the acute phase of experimental intracerebral hemorrhage. METHODS: Intracerebral hemorrhage was produced by stereotaxic injection of collagenase in Wistar rats. A randomized noninferiority trial design was used to assign rats to HDT15° or flat position (n = 64). HDT15° was applied for 1 h during the time window of hematoma expansion. The primary outcome was hematoma volume at 24 h. Secondary outcomes were mass effect, mortality, and functional deficit in the main study and acute changes of intracranial pressure, hematoma growth, and cardiorespiratory parameters in separate sets of randomized animals (n = 32). RESULTS: HDT15° achieved the specified criteria of noninferiority for hematoma volume at 24 h. Mass effect, mortality, and functional deficit at 24 h showed no difference in the two groups. HDT15° induced a mild increase in intracranial pressure with respect to the pretreatment values (+2.91 ± 1.76 mmHg). HDT15° had a neutral effect on MRI-based analysis of hematoma growth and cardiorespiratory parameters. CONCLUSIONS: Application of HDT15° in the hyperacute phase of experimental intracerebral hemorrhage does not worsen early outcome. Further research is needed to implement HDT15° as an emergency collateral therapeutic for acute stroke.


Assuntos
Decúbito Inclinado com Rebaixamento da Cabeça , Acidente Vascular Cerebral , Animais , Hemorragia Cerebral/diagnóstico por imagem , Hematoma/diagnóstico por imagem , Humanos , Distribuição Aleatória , Ratos , Ratos Wistar , Acidente Vascular Cerebral/diagnóstico por imagem , Acidente Vascular Cerebral/tratamento farmacológico , Resultado do Tratamento
2.
Eur J Neurol ; 27(12): 2641-2645, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32905639

RESUMO

BACKGROUND AND PURPOSE: Comorbidity of acute ischaemic stroke with Covid-19 is a challenging condition, potentially influencing the decision of whether to administer intravenous thrombolysis (IVT). We aimed to assess the 1-month outcome in ischaemic stroke patients with Covid-19 infection who received IVT alone or before thrombectomy (bridging therapy). METHODS: As a collaboration initiative promoted by the Italian Stroke Organization, all Italian stroke units (n = 190) were contacted and invited to participate in data collection on stroke patients with Covid-19 who received IVT. RESULTS: Seventy-five invited centers agreed to participate. Thirty patients received IVT alone and 17 received bridging therapy between 21 February 2020 and 30 April 2020 in 20 centers (n = 18, Northern Italy; n = 2, Central Italy). At 1 month, 14 (30.4%) patients died and 20 (62.5%) survivors had a modified Rankin Scale (mRS) score of 3 to 5. At 24 to 36 hours, asymptomatic intracerebral hemorrhage (ICH) was reported in eight (17.4%) patients and symptomatic ICH (sICH) in two (4.3%) patients. Causes of death were severe ischaemic stroke (n = 8), a new ischaemic stroke (n = 2), acute respiratory failure (n = 1), acute renal failure (n = 1), acute myocardial infarction (n = 1), and endocarditis (n = 1). In survivors with a 1-month mRS score of 3 to 5, baseline glucose level was higher, whereas endovascular procedure time in cases of bridging therapy was longer. Baseline National Institutes of Health Stroke Scale glucose and creatinine levels were higher in patients who died. CONCLUSIONS: Intravenous thrombolysis for patients with stroke and Covid-19 was not a rare event in the most affected areas by pandemic, and rates of 1-month unfavorable outcomes were high compared to previous data from the pre-Covid-19 literature. However, risk of sICH was not increased.


Assuntos
COVID-19/complicações , COVID-19/terapia , AVC Isquêmico/complicações , AVC Isquêmico/terapia , Terapia Trombolítica/métodos , Idoso , Idoso de 80 Anos ou mais , Glicemia/análise , COVID-19/mortalidade , Causas de Morte , Creatinina/sangue , Feminino , Fibrinolíticos/administração & dosagem , Fibrinolíticos/uso terapêutico , Humanos , Injeções Intravenosas , AVC Isquêmico/mortalidade , Itália/epidemiologia , Masculino , Pandemias , Análise de Sobrevida , Trombectomia , Resultado do Tratamento
3.
Nanotechnology ; 30(41): 415603, 2019 Oct 11.
Artigo em Inglês | MEDLINE | ID: mdl-31300614

RESUMO

One of the challenges in the development of germanium nanowires (Ge NWs) is to increase their length beyond the 10 µm limit without enlarging the NW diameter, i.e. minimizing the tapering. Here we report how it is possible to overcome this hurdle by using isobutyl germane (iBuGe) as a metal organic precursor during MOCVD growth, instead of the commonly used germane. We have grown and characterized by transmission electron microscopy, scanning electron microscopy and Raman various samples and we have analyzed the effect of growth time, precursor flux and growth temperature on the NW length. The use of iBuGe coupled to optimized growth conditions permitted to obtain Ge NWs with lengths up to 30 µm with minimal tapering. To explain why a new precursor has this impact on the morphology of the NWs we consider two possible causes: (i) the role of carbon radicals produced by isobutyl decomposition and (ii) the reduced growth rate of Ge on the sidewalls. On the basis of Raman characterization and temperature-dependence of tapering, we conclude that the reduced tapering is probably due to lower growth rates on the sidewalls.

4.
J Control Release ; 249: 103-110, 2017 03 10.
Artigo em Inglês | MEDLINE | ID: mdl-28153761

RESUMO

Solid lipid nanoparticles (SLN) are colloidal drug delivery systems characterized by higher entrapment efficiency, good scalability of the preparation process and increased sustained prolonged release of the payload compared to other nanocarriers. The possibility to functionalize the surface of SLN with ligands to achieve a site specific targeting makes them attractive to overcome the limited blood-brain barrier (BBB) penetration of therapeutic compounds. SLN are prepared for brain targeting by exploiting the adaptability of warm microemulsion process for the covalent surface modification with an Apolipoprotein E-derived peptide (SLN-mApoE). Furthermore, the influence of the administration route on SLN-mApoE brain bioavailability is here evaluated. SLN-mApoE are able to cross intact a BBB in vitro model. The pulmonary administration of SLN-mApoE is related to a higher confinement in the brain of Balb/c mice compared to the intravenous and intraperitoneal administration routes, without inducing any acute inflammatory reaction in the lungs. These results promote the pulmonary administration of brain-targeted SLN as a feasible strategy for improving brain delivery of therapeutics.


Assuntos
Apolipoproteínas E/metabolismo , Barreira Hematoencefálica/metabolismo , Portadores de Fármacos/metabolismo , Sistemas de Liberação de Medicamentos , Nanopartículas/metabolismo , Animais , Apolipoproteínas E/química , Apolipoproteínas E/farmacocinética , Células 3T3 BALB , Permeabilidade Capilar , Linhagem Celular , Portadores de Fármacos/química , Portadores de Fármacos/farmacocinética , Metabolismo dos Lipídeos , Lipídeos/química , Lipídeos/farmacocinética , Masculino , Camundongos , Nanopartículas/química , Propriedades de Superfície
5.
J Neuroinflammation ; 13: 16, 2016 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-26792363

RESUMO

BACKGROUND: Several lines of evidence support the involvement of the lectin pathway of complement (LP) in the pathogenesis of acute ischemic stroke. The aim of this multicenter observational study was to assess the prognostic value of different circulating LP initiators in acute stroke. METHODS: Plasma levels of the LP initiators ficolin-1, -2, and -3 and mannose-binding lectin (MBL) were measured in 80 stroke patients at 6 h only and in 85 patients at 48 h and later. Sixty-one age- and sex-matched healthy individuals served as controls. Stroke severity was measured on admission using the National Institutes of Health Stroke Scale (NIHSS). The outcome was measured at 90 days by the modified Rankin Scale (mRS). RESULTS: Ficolin-1 was decreased in patients compared with controls measured at 6 h (median 0.13 vs 0.33 µg/ml, respectively, p < 0.0001). At 48 h, ficolin-1 was significantly higher (0.45 µg/ml, p < 0.0001) compared to the 6 h samples and to controls. Likewise, ficolin-2 was decreased at 6 h (2.70 vs 4.40 µg/ml, p < 0.0001) but not at 48 h. Ficolin-3 was decreased both at 6 and 48 h (17.3 and 18.23 vs 21.5 µg/ml, p < 0.001 and <0.05, respectively). For MBL no difference was detected between patients and controls or within patients at the different time points. In multivariate analysis, early ficolin-1 was independently associated with unfavorable mRS outcome (adjusted odds ratio (OR): 2.21, confidence interval (CI) 95 % 1.11-4.39, p = 0.023). Early ficolin-1 improved the discriminating ability of an outcome model including NIHSS and age (area under the curve (AUC) 0.95, CI 95 % 0.90-0.99, p = 0.0001). CONCLUSIONS: The ficolins are consumed within 6 h after stroke implicating activation of the LP. Early ficolin-1 is selectively related to 3-month unfavorable outcome.


Assuntos
Isquemia Encefálica/complicações , Lectinas/sangue , Acidente Vascular Cerebral/sangue , Adulto , Fatores Etários , Idoso , Estudos de Casos e Controles , Estudos de Coortes , Feminino , Humanos , Itália , Masculino , Pessoa de Meia-Idade , Prognóstico , Análise de Regressão , Fatores de Risco , Índice de Gravidade de Doença , Estatísticas não Paramétricas , Acidente Vascular Cerebral/diagnóstico , Acidente Vascular Cerebral/etiologia , Fatores de Tempo , Ficolinas
6.
Neurol Sci ; 36 Suppl 1: 149-51, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-26017532

RESUMO

Cerebral venous thrombosis (CVT) may represent the clinical onset of malignancies or complicate their course, also in phase of quiescence. In literature, there are several case reports on the association between CVT and tumors, but there are few articles on its clinical characteristics in cancer patients (Pts). Our aim was to analyze the clinical characteristics of CVT associated with extracranial tumors. We identified nine cases of CVT in adults affected by extracranial tumors in 6 years from six hospitals. The median age was 40 years; eight Pts were female. Associated tumors were: lymphoma (4/9); breast (2/9), rhinopharynges (1/9) and gastric (1/9) carcinomas. One patient presented a kidney tumor and a melanoma at the same time. Multiple sinuses were affected in seven Pts. MRI showed parenchymal lesions in most cases (7/9). Clinical manifestations were: focal deficits (7/9), headache (6/9), early seizures (4/9) and consciousness disorders (3/9). Headache was the onset symptom in six Pts. In four of these Pts, headache preceded the onset of the focal deficit and/or seizures than 2-15 days. The characteristics of the headache were variable in intensity, location and type but all the Pts agreed in saying that it was an unusual headache, unresponsive to common pain medications. Five of the six Pts complaining of headache in the course of CVT presented focal deficits and parenchymal lesions at admission to the emergency room. All nine Pts were anticoagulated without further haemorrhagic complications. At discharge, the Pts presented a complete recovery in four cases, mild sequelae in four and moderate sequelae in one. In conclusion, we would like to underline the importance of particular care to cancer Pts complaining of headache, since the early diagnosis and the appropriate anticoagulant treatment could prevent the appearance of parenchymal lesions and the consequent neurological deficits. Also in the cases of normal brain CT, a brain MRI/MR venography should be performed in emergency setting if CVT is suspected.


Assuntos
Cefaleia/etiologia , Trombose Intracraniana/complicações , Neoplasias/complicações , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
7.
Brain Res ; 1615: 31-41, 2015 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-25912435

RESUMO

Statins have since long been reported to exert acute neuroprotection in experimental stroke models. However, crucial questions still need to be addressed as far as the timing of their cerebral effects after intravascular administration and the role played by the blood brain barrier (BBB) crossing properties. We tested the effects of an hydrophilic statin (pravastatin, 100 nM), which poorly crosses BBB under physiological conditions. Pravastatin was administered either 90 min before or immediately after transient middle cerebral artery occlusion in the in vitro isolated guinea pig brain preparation. A multi-modal outcome assessment was performed, through electrophysiological and cerebral vascular tone recordings, MAP-2 immunohistochemistry, BBB evaluation via ZO-1/FITC-albumin analysis, AKT and ERK activation and whole-cell antioxidant capacity. Pravastatin pre-ischemic administration did not produce any significant effect. Pravastatin post-ischemic administration significantly prevented MAP-2 immunoreactivity loss in ischemic areas, increased ERK phosphorylation in the ischemic hemisphere and enhanced whole-cell antioxidant capacity. Electrophysiological parameters, vascular tone and AKT signaling were unchanged. In all tested ischemic brains, ZO-1 fragmentation and FITC albumin extravasation was observed, starting 30 min from ischemia onset, indicating loss of BBB integrity. Our findings indicate that the rapid anti-ischemic effects of intravascular pravastatin are highly dependent on BBB increased permeability after stroke.


Assuntos
Barreira Hematoencefálica/metabolismo , Barreira Hematoencefálica/fisiopatologia , Isquemia Encefálica/metabolismo , Isquemia Encefálica/fisiopatologia , Fármacos Neuroprotetores/administração & dosagem , Pravastatina/administração & dosagem , Animais , Barreira Hematoencefálica/patologia , Encéfalo/efeitos dos fármacos , Encéfalo/metabolismo , Encéfalo/fisiopatologia , Isquemia Encefálica/prevenção & controle , Permeabilidade Capilar/efeitos dos fármacos , Cobaias , Infarto da Artéria Cerebral Média/complicações , Proteínas Associadas aos Microtúbulos/metabolismo , Proteína Quinase 3 Ativada por Mitógeno/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fatores de Tempo , Proteína da Zônula de Oclusão-1/metabolismo
8.
Minerva Anestesiol ; 81(6): 645-9, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25057934

RESUMO

Refractory status epilepticus (RSE) is a common challenge in the setting of post resuscitation care. We describe how multimodal neurological approach can lead treatment and improve the prognosis. We report on three survivors of cardiac arrest (CA) who had good neurological outcomes after mild hypothermia (TH), despite exhibiting persisting RSE requiring treatment with several antiepileptic (AED) and anesthetic drugs, including barbiturate-induced coma. No evidence-based data exist to guide management of RSE in the setting of anoxic brain injury. Our cases emphasize the need for continuous active treatment led by a multimodal approach in order to improve neurological outcome.


Assuntos
Parada Cardíaca/terapia , Estado Epiléptico/terapia , Idoso , Anticonvulsivantes/uso terapêutico , Reanimação Cardiopulmonar , Terapia Combinada , Feminino , Parada Cardíaca/etiologia , Humanos , Hipotermia Induzida , Masculino , Pessoa de Meia-Idade , Estado Epiléptico/complicações
9.
J Biol Regul Homeost Agents ; 27(1): 253-8, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23489705

RESUMO

Acute respiratory tract infections (ARTIs) are the most frequent illnesses in pediatric age, frequently experienced in children with Down Syndrome (DS) due to the associated immune defects of both specific and non-specific immunity. Pidotimod, a synthetic immunostimulant, was shown to reduce the rates of ARTIs in children with DS, however the mechanisms associated with this effect is currently unknown. We analyzed immune parameters in DS children who received the seasonal 2011–2012 virosomal-adjuvanted influenza vaccine. Eighteen children aged 3-10 years (mean age 7.1+/-2.6 years) were randomly assigned (1:1 ratio) to receive Pidotimod 400 mg, administered orally once a day for 90 days or placebo. At the recruitment (T0) all children received a single dose of virosomal-adjuvanted influenza vaccine (Flu). Blood samples were collected at T0 and 3 months after the recruitment (T3) in order to evaluate innate and adaptative immune responses pathway. Flu-specific IgG1 and IgG3 levels in plasma samples were determined at pre-vaccination (T0), and 1 (T1) and 3 months (T3) post-vaccination. The use of Pidotimod was associated with the upregulation of a number of genes involved in the activation of innate immune responses and in antimicrobial activity. Interestingly the ratio of Flu-specific IgG1/IgG3 was skewed in pidotimod-treated individuals, suggesting a preferential activation of complement-dependent effector mechanisms. Although preliminary these data suggest that Pidotimod can potentiate the beneficial effect of immunization, possibly resulting in a stronger activity of both innate and adaptive immune responses.


Assuntos
Síndrome de Down/tratamento farmacológico , Síndrome de Down/imunologia , Fatores Imunológicos/uso terapêutico , Ácido Pirrolidonocarboxílico/análogos & derivados , Tiazolidinas/uso terapêutico , Imunidade Adaptativa/efeitos dos fármacos , Imunidade Adaptativa/genética , Criança , Pré-Escolar , Síndrome de Down/sangue , Feminino , Regulação da Expressão Gênica/efeitos dos fármacos , Humanos , Imunidade Inata/efeitos dos fármacos , Imunidade Inata/genética , Imunoglobulina G/sangue , Fatores Imunológicos/imunologia , Fatores Imunológicos/farmacologia , Vacinas contra Influenza/imunologia , Masculino , Ácido Pirrolidonocarboxílico/imunologia , Ácido Pirrolidonocarboxílico/farmacologia , Ácido Pirrolidonocarboxílico/uso terapêutico , Tiazolidinas/imunologia , Tiazolidinas/farmacologia , Vacinas Virossomais/imunologia
10.
Eur J Neurol ; 19(9): 1199-206, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22448957

RESUMO

OBJECTIVE: To examine whether thrombolysis for stroke attributable to cervical artery dissection (CeAD(Stroke) ) affects outcome and major haemorrhage rates. METHODS: We used a multicentre CeAD(Stroke) database to compare CeAD(Stroke) patients treated with and without thrombolysis. Main outcome measures were favourable 3-month outcome (modified Rankin Scale 0-2) and 'major haemorrhage' [any intracranial haemorrhage (ICH) and major extracranial haemorrhage]. Adjusted odds ratios [OR (95% confidence intervals)] were calculated on the whole database and on propensity-matched groups. RESULTS: Among 616 CeAD(Stroke) patients, 68 (11.0%) received thrombolysis; which was used in 55 (81%) intravenously. Thrombolyzed patients had more severe strokes (median NIHSS score 16 vs. 3; P < 0.001) and more often occlusion of the dissected artery (66.2% vs. 39.4%; P < 0.001). After adjustment for stroke severity and vessel occlusion, the likelihood for favourable outcome did not differ between the treatment groups [OR(adjusted) 0.95 (95% CI 0.45-2.00)]. The propensity matching score model showed that the odds to recover favourably were virtually identical for 64 thrombolyzed and 64 non-thrombolyzed-matched CeAD(Stroke) patients [OR 1.00 (0.49-2.00)]. Haemorrhages occurred in 4 (5.9%) thrombolyzed patients, all being asymptomatic ICHs. In the non-thrombolysis group, 3 (0.6%) patients had major haemorrhages [asymptomatic ICH (n = 2) and major extracranial haemorrhage (n = 1)]. CONCLUSION: As thrombolysis was neither independently associated with unfavourable outcome nor with an excess of symptomatic bleedings, our findings suggest thrombolysis should not be withheld in CeAD(Stroke) patients. However, the lack of any trend towards a benefit of thrombolysis may indicate the legitimacy to search for more efficient treatment options including mechanical revascularization strategies.


Assuntos
Isquemia Encefálica/tratamento farmacológico , Dissecação da Artéria Carótida Interna/tratamento farmacológico , Acidente Vascular Cerebral/tratamento farmacológico , Terapia Trombolítica/métodos , Dissecação da Artéria Vertebral/tratamento farmacológico , Adulto , Isquemia Encefálica/etiologia , Dissecação da Artéria Carótida Interna/complicações , Bases de Dados Factuais , Feminino , Humanos , Hemorragias Intracranianas/induzido quimicamente , Masculino , Pessoa de Meia-Idade , Estudos Multicêntricos como Assunto , Razão de Chances , Estudos Retrospectivos , Acidente Vascular Cerebral/etiologia , Terapia Trombolítica/efeitos adversos , Resultado do Tratamento , Dissecação da Artéria Vertebral/complicações
11.
Neurology ; 77(20): 1785-93, 2011 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-21975208

RESUMO

OBJECTIVE: To assess incidence and predictors of acute symptomatic seizures in a prospective cohort of patients with first stroke. METHODS: Patients with first stroke hospitalized in 31 Italian centers were recruited. Relevant demographic data, disease characteristics, and risk factors were collected. Acute symptomatic seizures (≤7 days) were recorded and correlated to age, gender, family history of epilepsy, and vascular risk factors. RESULTS: A total of 714 patients (315 women, 399 men; age 27-97 years) were enrolled. A total of 609 (85.3%) had cerebral infarction (32 cerebral infarction with hemorrhagic transformation [CIHT]) and 105 (14.7%) primary intracerebral hemorrhage (PIH). A total of 141 (19.7%) had a large lesion (>3 cm) and 296 (41.5%) cortical involvement. Twelve patients reported family history of seizures. Forty-five patients (6.3%) presented acute symptomatic seizures, 24 with cerebral infarction (4.2%), 4 with CIHT (12.5%), and 17 (16.2%) with PIH. In multivariate analysis, compared to cerebral infarction, PIH carried the highest risk (odds ratio [OR] 7.2; 95% confidence interval [CI] 3.5-14.9) followed by CIHT (OR 2.7; 95% CI 0.8-9.6). Cortical involvement was a risk factor for PIH (OR 6.0; 95% CI 1.8-20.8) and for CI (OR 3.1; 95% CI 1.3-7.8). Hyperlipidemia (OR 0.2; 95% CI 0.03-0.8) was a protective factor for IPH. CONCLUSION: The incidence of acute symptomatic seizures is the highest reported in patients with first stroke with prospective follow-up. Hemorrhagic stroke and cortical lesion were independent predictors of acute symptomatic seizures. Hyperlipidemia was a protective factor for hemorrhagic stroke.


Assuntos
Convulsões/epidemiologia , Acidente Vascular Cerebral/complicações , Acidente Vascular Cerebral/diagnóstico , Doença Aguda/epidemiologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos de Coortes , Feminino , Humanos , Hiperlipidemias/sangue , Hiperlipidemias/complicações , Incidência , Hemorragias Intracranianas/complicações , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Estudos Prospectivos , Fatores de Risco , Convulsões/complicações , Convulsões/etiologia , Acidente Vascular Cerebral/epidemiologia , Fatores de Tempo
12.
Artigo em Inglês | MEDLINE | ID: mdl-21548454

RESUMO

A 13-year-old elite swimmer presented with wheezing after indoor swimming training. On the basis of her clinical history and the tests performed, exercise-induced asthma and mold-induced asthma were ruled out and a diagnosis of chlorine-induced asthma was made.


Assuntos
Asma Induzida por Exercício/etiologia , Cloro/efeitos adversos , Piscinas , Adolescente , Asma Induzida por Exercício/induzido quimicamente , Asma Induzida por Exercício/imunologia , Broncoconstrição/efeitos dos fármacos , Broncoconstrição/imunologia , Feminino , Humanos , Testes Cutâneos/métodos , Natação
13.
Neuropharmacology ; 60(6): 878-85, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21236270

RESUMO

The acute effects of simvastatin lactone (lipophilic) and simvastatin acid (hydrophilic) on transient focal ischemia were assessed using the isolated guinea pig brain maintained in vitro by arterial perfusion. This new model of cerebral ischemia allows the assessment of the very early phase of the ischemic process, with the functional preservation of the vascular and neuronal compartments and the blood-brain barrier (bbb). The middle cerebral artery was transiently tied for 30 min followed by reperfusion for 60 min. Statins (nanomolar doses) were administered by intravascular continuous infusion starting 60 min before ischemia induction. Brain cortical activity and arterial vascular tone were continuously recorded. At the end of the experiment immunoreactivity for microtubule-associated protein 2 (MAP-2), expression of survival kinases (ERK and Akt) and total anti-oxidant capacity were assayed. Brains treated with simvastatin lactone showed i) reduced amplitude and delayed onset of ischemic depressions, ii) preservation of MAP-2 immunoreactivity, iii) activation of ERK signaling in the ischemic hemisphere and iv) increase in whole-brain anti-oxidant capacity. Treatment with the bbb-impermeable simvastatin acid was ineffective on the above-mentioned parameters. Vascular resistance recordings and Akt signaling were unchanged by any statin treatment. Our findings suggest that intravascular-delivered simvastatin exerts an acute lipophilicity-dependent protective effect in the early phase of cerebral ischemia.


Assuntos
Isquemia Encefálica/tratamento farmacológico , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Infarto da Artéria Cerebral Média/tratamento farmacológico , Sinvastatina/uso terapêutico , Solubilidade , Animais , Isquemia Encefálica/metabolismo , Isquemia Encefálica/fisiopatologia , Modelos Animais de Doenças , Eletrofisiologia/métodos , Cobaias , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Infarto da Artéria Cerebral Média/metabolismo , Infarto da Artéria Cerebral Média/fisiopatologia , Infusões Intravenosas , Proteínas Associadas aos Microtúbulos/metabolismo , Proteína Quinase 1 Ativada por Mitógeno/metabolismo , Oxirredução/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-akt/metabolismo , Sinvastatina/administração & dosagem , Sinvastatina/análogos & derivados , Sinvastatina/química , Sinvastatina/farmacologia , Resistência Vascular/efeitos dos fármacos , Resistência Vascular/fisiologia
15.
Cochrane Database Syst Rev ; (1): CD006264, 2008 Jan 23.
Artigo em Inglês | MEDLINE | ID: mdl-18254098

RESUMO

BACKGROUND: Short term high dose corticosteroid treatment improves symptoms and short term disability after an acute exacerbation of multiple sclerosis (MS) but it is unknown whether its long-term use can reduce the accumulation of disability. OBJECTIVES: To determine the efficacy and safety of long-term corticosteroid use in MS. SEARCH STRATEGY: We searched the following bibliographic databases: CENTRAL (Issue 1, 2007), MEDLINE (1966 to February 2007) and EMBASE (1980 to February 2007). In an effort to identify further published, unpublished and ongoing trials we searched reference lists and contacted trial authors and one pharmaceutical company. SELECTION CRITERIA: We considered controlled, randomised trials (RCTs), with or without blinding, of long term treatment (i.e. longer than 6 months) of any type of corticosteroid in MS, irrespective of disease course. DATA COLLECTION AND ANALYSIS: Reviewers independently assessed trial quality and extracted data. Study authors were contacted for additional information. MAIN RESULTS: Three trials, all classified at high risk of bias, contributed to this review (Miller 1961; BPSM 1995; Zivadinov 2001) resulting in a total of 183 participants (91 treated). Corticosteroid therapy did not reduce the risk of being worse at the end of follow-up (odds ratio [OR] 0.51, 95% confidence interval [CI] 0.26 to 1.02) but there was a substantial heterogeneity between studies (I(2): 78.4%). I. v. periodic high dose methylprednisolone (MP) was associated with a significant reduction in the risk of disability progression at 5 years in relapsing-remitting (RR) MS (OR 0.26, 95% CI 0.10 to 0.66), while oral continuous low dose prednisolone was not associated with any risk reduction in disability progression at 18 months (OR 1.23, 95% CI 0.43 to 3.56). Risk of experiencing at least one exacerbation at end of follow-up was not significantly reduced with corticosteroid treatment (OR 0.36; 95% CI 0.10 to 1.25). Only one study recorded adverse events: in one patient i. v. MP was discontinued after the fourth pulse when he developed acute glomerulonephritis; a second patient was removed from the study after the fifth i. v. MP pulse because of severe osteoporosis. AUTHORS' CONCLUSIONS: There is no enough evidence that long-term corticosteroid treatment delays progression of long term disability in patients with MS. Since one study at high risk of bias showed that the administration of pulsed high dose i. v. MP is associated with a significant reduction in the risk of long term disability progression in patients with RR MS, an adequately powered, high quality RCT is needed to investigate this finding.


Assuntos
Corticosteroides/uso terapêutico , Assistência de Longa Duração , Esclerose Múltipla/tratamento farmacológico , Corticosteroides/efeitos adversos , Progressão da Doença , Humanos , Metilprednisolona/efeitos adversos , Metilprednisolona/uso terapêutico , Prednisolona/efeitos adversos , Prednisolona/uso terapêutico , Ensaios Clínicos Controlados Aleatórios como Assunto
16.
Clin Drug Investig ; 27(8): 573-81, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17638398

RESUMO

BACKGROUND: The renal safety of tenofovir in HIV-infected children has not been well studied. In paediatrics, prediction of glomerular filtration rate (GFR) is usually obtained by the Schwartz equation; the Cockcroft-Gault equation is considered more appropriate in children aged >12 years, but can be misleading in younger children. The aims of this study were to assess renal safety and GFR changes as estimated by the Schwartz and Cockcroft-Gault equations in HIV-infected children treated with tenofovir for 96 weeks. METHODS: Several parameters of glomerular and tubular function were prospectively assessed (at baseline and at weeks 24, 48, 72 and 96) in 27 HIV-infected children (aged 4.9-18.0 years) receiving a tenofovir-containing antiretroviral regimen. GFR was estimated using Schwartz and Cockcroft-Gault equations in children younger and older than 12 years, respectively. RESULTS: No child experienced a grade 1 (> or =44 micromol/L) or higher increase in serum creatinine or a grade 1 (< or =0.71 mmol/L) or higher hypophosphataemia. Serum bicarbonate values were in the normal range for age at baseline. Mean serum creatinine, serum phosphorus and serum bicarbonate values remained unchanged. No child showed proteinuria, microalbuminuria or glycosuria at baseline or during the study period. The mean urinary protein/creatinine, albumin/creatinine, alpha(1)-microglobulin/creatinine and maximal tubular phosphate reabsorption (TmPO(4)/GFR) ratios remained unchanged. Up to week 96, no patient experienced a significant decrease in GFR, as estimated by the more appropriate formula for age. CONCLUSION: Through 96 weeks, we found no evidence of impaired glomerular or tubular renal function in tenofovir-treated HIV-infected children.


Assuntos
Adenina/análogos & derivados , Fármacos Anti-HIV/efeitos adversos , Infecções por HIV/tratamento farmacológico , Nefropatias/induzido quimicamente , Organofosfonatos/efeitos adversos , Adenina/efeitos adversos , Adenina/uso terapêutico , Adolescente , Fármacos Anti-HIV/uso terapêutico , Criança , Pré-Escolar , Feminino , Taxa de Filtração Glomerular/efeitos dos fármacos , Infecções por HIV/virologia , Humanos , Nefropatias/fisiopatologia , Masculino , Organofosfonatos/uso terapêutico , Estudos Prospectivos , Tenofovir
17.
Clin Microbiol Infect ; 12(7): 674-6, 2006 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-16774566

RESUMO

A cluster of cases of Candida albicans candidaemia in a surgical intensive care unit was investigated. The probability of such a cluster during a single month was highly significant compared with the frequency of candidaemia in the previous year. A molecular typing method, based on length analysis of three (EF3, CDC3, HIS3) microsatellite-containing regions, was used to investigate isolates from patients in and outside the ward. This demonstrated the involvement of different strains, indicating the absence of cross-transmission among patients. Results of microsatellite typing can be obtained almost in real-time, which is particularly useful in an outbreak context.


Assuntos
Candida albicans/isolamento & purificação , Candidíase/diagnóstico , Infecção Hospitalar/diagnóstico , Surtos de Doenças , Idoso , Candida albicans/genética , Candidíase/sangue , Infecção Hospitalar/sangue , Humanos , Unidades de Terapia Intensiva , Masculino , Repetições de Microssatélites/genética , Pessoa de Meia-Idade , Distribuição de Poisson
19.
Eur J Echocardiogr ; 5(4): 257-61, 2004 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-15219540

RESUMO

AIMS: Thromboembolism may complicate electrical cardioversion (ECV) of atrial fibrillation/flutter (AF). The use of 3 weeks of warfarin before ECV results in a substantial reduction of thromboembolic complications. Nevertheless, in patients scheduled for ECV subtherapeutic INR levels are common. We sought to assess the prevalence and the predictors of atrial thrombi in patients affected with sustained AF in whom subtherapeutic INR values were detected in the 3 weeks preceding scheduled ECV. METHODS AND RESULTS: Forty-one patients with persistent AF and > or =3 weeks warfarin anticoagulation who exhibited subtherapeutic INR values in the last 3 weeks underwent a transoesophageal echocardiogram (TOE) before a scheduled ECV. A left atrial appendage (LAA) thrombus was diagnosed on TOE in four patients (9.8%). Patients with thrombus had lower INR values (1.45+/-0.09 vs 1.72+/-0.20; p=0.0068), lower LAA emptying velocities (13.75+/-4.5 vs 25.86+/-12.4 cm/s; p=0.0313) and higher prevalence of atrial smoke (100 vs 37.8%,p=0.03). CONCLUSIONS: Subtherapeutic levels of anticoagulation before elective ECV of AF may expose patients to post-ECV thromboembolic sequelae, especially in patients with lowest INR values. Current recommendations of a full course of therapeutic anticoagulation before ECV of persistent AF should be firmly observed.


Assuntos
Anticoagulantes/uso terapêutico , Artérias/efeitos dos fármacos , Artérias/patologia , Fibrilação Atrial/tratamento farmacológico , Fibrilação Atrial/epidemiologia , Flutter Atrial/tratamento farmacológico , Flutter Atrial/epidemiologia , Cardioversão Elétrica , Tromboembolia/tratamento farmacológico , Tromboembolia/epidemiologia , Idoso , Artérias/diagnóstico por imagem , Biomarcadores/sangue , Terapia Combinada , Ecocardiografia , Ecocardiografia Transesofagiana , Feminino , Seguimentos , Átrios do Coração/diagnóstico por imagem , Átrios do Coração/efeitos dos fármacos , Átrios do Coração/patologia , Humanos , Coeficiente Internacional Normatizado , Itália/epidemiologia , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Prevalência , Estudos Retrospectivos , Resultado do Tratamento
20.
Neurology ; 61(11): 1607-10, 2003 Dec 09.
Artigo em Inglês | MEDLINE | ID: mdl-14663052

RESUMO

Patients with diabetes mellitus (DM) may develop chronic inflammatory demyelinating polyneuropathy (CIDP), which may be difficult to distinguish from diabetic neuropathy (DNP). Here the authors show that immunoreactivity for matrix metalloproteinase-9 on sural nerve biopsies may help to identify CIDP-DM. In a pilot study on 10 CIDP-DM patients with IV immunoglobulins and tight glycemic control, the CIDP-DM patients had a better outcome than DNP patients treated with tight glycemic control only.


Assuntos
Complicações do Diabetes , Metaloproteinase 9 da Matriz/análise , Polirradiculoneuropatia Desmielinizante Inflamatória Crônica/diagnóstico , Nervo Sural/enzimologia , Adulto , Idoso , Diabetes Mellitus/diagnóstico , Diabetes Mellitus/tratamento farmacológico , Neuropatias Diabéticas/diagnóstico , Diagnóstico Diferencial , Feminino , Seguimentos , Humanos , Imuno-Histoquímica , Masculino , Metaloproteinase 9 da Matriz/imunologia , Pessoa de Meia-Idade , Polirradiculoneuropatia Desmielinizante Inflamatória Crônica/complicações , Polirradiculoneuropatia Desmielinizante Inflamatória Crônica/tratamento farmacológico , Nervo Sural/patologia
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