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1.
Saudi Med J ; 45(8): 848-850, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-39074892

RESUMO

Immune thrombocytopenia (ITP) is an autoimmune disorder marked by low platelet counts that puts patients at risk for spontaneous bleeding. A rare trigger for ITP is iron repletion, which has only been reported in a few cases. In this article, we present a unique case of a 54-year-old male with a history of recurrent ITP who experienced rapid thrombocytopenia following iron repletion with ferrous gluconate. Discontinuation of ferrous medications resulted in platelet counts returning to the normal baseline. Following more than 30 years of the patient's clinical timeline, this case demonstrates the chronic nature of ITP and the complexity of its causes. Further studies are needed to determine the prevalence of iron repletion-induced thrombocytopenia and its underlying mechanisms.


Assuntos
Compostos Ferrosos , Trombocitopenia , Humanos , Masculino , Pessoa de Meia-Idade , Compostos Ferrosos/efeitos adversos , Trombocitopenia/induzido quimicamente , Ferro/efeitos adversos , Púrpura Trombocitopênica Idiopática/induzido quimicamente , Púrpura Trombocitopênica Idiopática/tratamento farmacológico
2.
Chin Clin Oncol ; 13(1): 5, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38453656

RESUMO

BACKGROUND: The management of chemotherapy induced anemia (CIA) remains challenging. The potential risk and benefits in providing patient-centered care need to be balanced; the disease is multifactorial; and the major treatments including red blood cell (RBC) transfusions, erythropoiesis-stimulating agents (ESAs) and intravenous injection (i.v.)iron supplementation have a unique set of strengths and limitations. Also, most previous survey based on the patient data could not reveal the process of evaluation and decision-making for CIA treatment from a physician's perspective. As the comparison of China Society of Clinical Oncology (CSCO), National Comprehensive Cancer Network (NCCN) and European Society of Medical Oncology (ESMO) guidelines, the standard of CIA treatment in China will vary from United States and Europe, for example, the initial hemoglobin (Hb) for RBC transfusions. In order to understand the diagnosis, treatment, and unmet medical needs of CIA patients, the China Medical Education Association (CMEA), in conjunction with Cancer Hope Medium, initiated the first national survey of Chinese physicians regarding the diagnosis and treatment of CIA. METHODS: The CMEA sent an online, 12-item questionnaire (via wjx.cn) to physicians across China from September 1, 2022 to October 22, 2022. Two hundred and sixty-five samples were calculated usingsurveyplanet.com. The questionnaire evaluated the impact of anemia on chemotherapy interruption, initial treatment, the target Hb level of CIA in, and the current status of ESAs prescription in clinical practice. Respondents were asked to score their reasons for not using ESAs (including safety issues, drug access in practice or adherence) and the risk options of the current treatment including ESAs, RBC transfusion, and i.v.iron. RESULTS: A total of 331 questionnaires among 5,000 web visits were gathered, covering 247 hospitals in 29 provinces across China, of which 130 (53%) were tier IIIA hospitals, 50 (20%) were tier III B hospitals, 59 (24%) were tier IIA hospitals, and 8 (3%) were tier II B hospitals. The frequency of chemotherapy dose delay/reduction due to anemia was 24% [standard deviation (SD) 49%]. Most responding physicians rated an initial Hb level for ESAs treatment to be 80 g/L, with a favorable Hb level for chemotherapy being 100 g/L (60%), which would not limit treatment availability. The majority (67.6%, n=221) of physicians who responded indicated that they had used ESAs for anemia correction, while the others (32.4%, n=106) reported never using them. CONCLUSIONS: This is the first study in conducting a large-scale survey on the diagnosis and treatment of CIA in China from a physicians' perspective. We found that in China, nearly one-quarter of patients undergoing chemotherapy with concurrent anemia may experience interruption of chemotherapy and that the initiation of anemia treatment is not adequately timed. In treating CIA, most physicians prioritize the completion of chemotherapy via Hb level over treating the symptoms of anemia.


Assuntos
Anemia , Antineoplásicos , Hematínicos , Neoplasias , Médicos , Humanos , Estados Unidos , Antineoplásicos/uso terapêutico , Anemia/induzido quimicamente , Anemia/tratamento farmacológico , Ferro/efeitos adversos , Hematínicos/efeitos adversos , Neoplasias/tratamento farmacológico , Neoplasias/complicações , Inquéritos e Questionários , Percepção
3.
J Investig Med ; 72(5): 457-464, 2024 06.
Artigo em Inglês | MEDLINE | ID: mdl-38429647

RESUMO

Pediatric iron deficiency anemia (IDA) is often treated with oral iron supplementation as the first-line therapy despite poor adherence. This single-institution retrospective chart review of pediatric patients was conducted to assess the safety, efficacy, and adherence of intravenous (IV) iron infusions compared to oral iron therapy in patients who had failed a trial of oral iron supplementation. We reviewed medical records of patients aged 1-21 with IDA who received at least one IV iron infusion at Cooper University Hospital between 2016 and 2021. Paired t-tests compared pre-infusion and post-infusion hematologic indices of hemoglobin (Hgb), mean corpuscular volume, red blood cell count, red cell distribution width, ferritin, total iron binding capacity, iron stores, and iron saturation. We compared adherence and adverse reactions to both oral iron supplementation and IV iron infusions using McNemar's test. A total of 107 subjects were included (mean age of 12.7 years). Hgb, ferritin, iron, and iron saturation between pre-infusion and post-final infusion significantly improved (p < 0.001). Hgb, ferritin, and iron improved when subcategorizing by race and etiology of IDA. Adherence to IV iron infusions (70.1%) was significantly greater than adherence to oral iron therapy (43.0%). There were also significantly fewer adverse effects with IV iron infusions (3.7%) compared to oral iron (77.9%). We demonstrated the safety, efficacy, and improved adherence of IV iron infusions compared to oral iron supplementation for treatment of pediatric IDA in patients who were unable to tolerate oral iron supplementation. Future studies could compare adherence to multiple doses of IV iron infusions in contrast with other single-dosing IV iron formulations.


Assuntos
Anemia Ferropriva , Ferro , Humanos , Estudos Retrospectivos , Feminino , Criança , Masculino , Ferro/administração & dosagem , Ferro/efeitos adversos , Adolescente , Anemia Ferropriva/tratamento farmacológico , Anemia Ferropriva/sangue , Infusões Intravenosas , Pré-Escolar , Lactente , Resultado do Tratamento , Adulto Jovem
4.
Bull World Health Organ ; 102(3): 176-186, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-38420570

RESUMO

Objective: To investigate the effect of daily iron supplementation for 14 weeks on the serum iron concentration and other markers of iron status in exclusively breastfed infants in Gambia. Methods: A placebo-controlled, randomized, double-blind trial was performed in rural Gambia between 3 August 2021 and 9 March 2022. Overall, 101 healthy, exclusively breastfed infants aged 6 to 10 weeks were recruited at vaccination clinics and through community health workers. Infants were randomized to receive iron supplementation (7.5 mg/day as ferrous sulfate in sorbitol solution) or placebo for 98 days. Venous blood samples were collected at baseline and on day 99 to assess the serum iron concentration and other markers of iron and haematological status. Findings: At day 99, the serum iron concentration was significantly higher in the iron supplementation group than the placebo group (crude difference in means: 2.5 µmol/L; 95% confidence interval: 0.6 to 4.3) and there were significant improvements in other iron and haematological markers. There were 10 serious adverse events (five in each group), 106 non-serious adverse events (54 with iron supplementation; 52 with placebo) and no deaths. There was no marked difference between the groups in maternally reported episodes of diarrhoea, fever, cough, skin infection, eye infection or nasal discharge. Conclusion: In exclusively breastfed Gambian infants, iron supplementation from 6 weeks of age was associated with a significant improvement in markers of iron status at around 6 months of age. There was no indication of adverse effects on growth or infections.


Assuntos
Aleitamento Materno , Ferro , Lactente , Feminino , Humanos , Ferro/efeitos adversos , Gâmbia , Suplementos Nutricionais/efeitos adversos
6.
Trends Cancer ; 10(5): 417-429, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38246792

RESUMO

Ferroptosis, a nonapoptotic form of cell death characterized by iron accumulation and uncontrolled lipid peroxidation, holds promise as a therapeutic approach in cancer treatment, alongside established modalities, such as chemotherapy, immunotherapy, and radiotherapy. However, recent research has raised concerns about its side effects, including damage to immune cells, hematopoietic stem cells, liver, and kidneys, the development of cachexia, and the risk of secondary tumor formation. In this review, we provide an overview of these emerging findings, with a specific emphasis on elucidating the underlying mechanisms, and underscore the critical significance of effectively managing side effects associated with targeted ferroptosis-based therapy.


Assuntos
Ferroptose , Neoplasias , Humanos , Ferroptose/efeitos dos fármacos , Neoplasias/terapia , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Antineoplásicos/efeitos adversos , Antineoplásicos/uso terapêutico , Animais , Ferro/metabolismo , Ferro/efeitos adversos , Peroxidação de Lipídeos/efeitos dos fármacos , Caquexia/etiologia , Caquexia/terapia
7.
Synapse ; 78(1): e22286, 2024 01.
Artigo em Inglês | MEDLINE | ID: mdl-38287474

RESUMO

In this study, we aimed to validate the hypothesis that the interplay between sevoflurane, oxidative stress and ferroptosis is crucial for the pathogenesis of sevoflurane-induced cognitive impairment in aged individuals. The mice with sevoflurane-induced cognitive impairment were used to explore the effects of sevoflurane on oxidative stress, iron homeostasis, and cognitive function in aged mice. Iron content and oxidative stress markers were analyzed in hippocampal tissue homogenates using specific assays. Additionally, the levels of iron death-related markers (Fth1 and Gpx4) were assessed by real-time PCR and Western blotting. Morris Water Maze and novel object recognition (NOR) tests were conducted to evaluate cognitive function. Sevoflurane exposure in aged mice resulted in a significant increase in iron overloading in the hippocampus, followed by a subsequent stabilization. Oxidative stress levels were elevated in the hippocampal tissue of sevoflurane-exposed mice, and a significant correlation was observed between iron death and oxidative stress. Liproxstatin-1, a ferroptosis inhibitor, effectively ameliorated the decline in memory and learning abilities induced by sevoflurane anesthesia. Liproxstatin-1 treatment reduced iron overload and oxidative stress in the hippocampal tissue of aged mice. The expression of Fth1 and Gpx4, iron death-related markers, was downregulated following Liproxstatin-1 intervention. Our findings suggest that sevoflurane anesthesia disrupts iron homeostasis, leading to increased oxidative stress and cognitive impairment in aged mice. These results highlight the potential of targeting iron-mediated processes to mitigate sevoflurane-induced cognitive impairment in the aging population.


Assuntos
Anestesia , Disfunção Cognitiva , Ferroptose , Quinoxalinas , Compostos de Espiro , Animais , Camundongos , Sevoflurano/efeitos adversos , Sevoflurano/metabolismo , Disfunção Cognitiva/induzido quimicamente , Disfunção Cognitiva/tratamento farmacológico , Estresse Oxidativo , Anestesia/efeitos adversos , Cognição , Ferro/efeitos adversos , Ferro/metabolismo , Hipocampo/metabolismo
8.
PeerJ ; 12: e16755, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38274332

RESUMO

Background: Congenital heart disease (CHDs) is the major cause of mortality from birth defects, affecting up to 1% of live births worldwide. However, the relationship between aluminum (Al) and iron (Fe) levels and the risk of CHDs has yielded inconsistent results. Methods: We conducted a pair-matched case-control study that included 97 CHDs and 194 non-CHDs to investigate the association and interaction between Al/Fe exposure and the risk of CHDs in a birth cohort study in Lanzhou, China. Results: Higher concentrations of cord blood Al were associated with a greater risk of total CHDs (aOR = 2.826, 95% CI [1.009-7.266]) and isolated CHDs (aOR = 10.713, 95% CI [1.017-112.851]) compared to the lowest Al level. Both in maternal blood and cord blood, a significant dose-effect was observed between Al level and total CHDs (Ptrend < 0.05), but a similar pattern was not observed for Fe. High Al in addition to high Fe appeared to elicit a stronger association with CHDs than both lowest tertile of Al and Fe level in umbilical cord blood, particularly for multiple CHDs, septal defects and patent ductus arteriosus. Conclusions: Our study suggests that exposure to Al during pregnancy (≥2,408 µg/L) is significantly associated with an increased risk of CHDs in offspring, especially septal defects, and that high levels of Al and Fe are strongly correlated with fetal heart development. Further research is needed to understand the underlying mechanisms.


Assuntos
Sangue Fetal , Cardiopatias Congênitas , Gravidez , Feminino , Criança , Humanos , Estudos de Casos e Controles , Alumínio/efeitos adversos , Ferro/efeitos adversos , Fatores de Risco , Estudos de Coortes , Cardiopatias Congênitas/epidemiologia
9.
Int J Clin Pharm ; 46(2): 390-400, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38147281

RESUMO

BACKGROUND: Nutritional deficit and oral iron gastrointestinal intolerance may be a common cause of iron deficiency, which can be managed by pharmacists. AIM: To understand the prevalence of iron deficiency in women of childbearing age with a self-reported history of intolerance to oral iron and the tolerability of three doses of an iron-whey-protein formulation in the care of these women. METHOD: Ferritin and haemoglobin levels were documented in women of childbearing age with oral iron gastrointestinal intolerance. In those with iron deficiency (ferritin < 30 µg/L), adherence, gastrointestinal tolerability, ferritin, transferrin saturation and haemoglobin levels were compared between their prior oral iron product and iron-whey-protein microspheres randomised to three doses (14 mg daily, 25 mg daily and 50 mg daily) for 12 weeks. RESULTS: Most screened women had low iron stores (128 (62.7%); ferritin < 30 µg/L), 65 (31.9%) had moderate to severe iron deficiency (ferritin < 12 µg/L) and 33 (16.2%) had iron deficiency anaemia (ferritin < 30 µg/L, haemoglobin < 12 g/dL). Amongst the 59 women who participated in the prospective clinical study of iron-whey-protein microspheres over 12 weeks, 48 (81.4%) were classified as adherent/persistent and fewer instances of gastrointestinal intolerance were reported (0.59 ± 0.91) when compared to 12 (20.3%) and (4.0 ± 2.2) respectively while taking the prior oral iron (Fisher's Exact and T-test respectively, both p < 0.001). There was no difference in adherence or tolerability of different iron-whey-protein formulation doses. Ferritin, haemoglobin and energy levels increased significantly over 12 weeks. CONCLUSION: Undiagnosed iron deficiency is common in women of childbearing age with a history of intolerance to oral iron and iron-whey-protein microspheres can improve adherence, GI tolerability, iron stores, haemoglobin and energy levels in these women. CLINICAL TRIAL REGISTRATION: Clinicaltrials.gov identifier (registration includes full trial protocol): NCT04778072.


Assuntos
Anemia Ferropriva , Deficiências de Ferro , Feminino , Humanos , Ferro/efeitos adversos , Estudos Prospectivos , Soro do Leite/metabolismo , Anemia Ferropriva/diagnóstico , Anemia Ferropriva/tratamento farmacológico , Anemia Ferropriva/epidemiologia , Ferritinas , Hemoglobinas/metabolismo
13.
Braz. J. Pharm. Sci. (Online) ; 58: e20942, 2022. graf
Artigo em Inglês | LILACS | ID: biblio-1420449

RESUMO

Abstract In the last decades, ferroptosis and its relationship with Parkinson's disease have gained significant attention. Compounds that affect ferroptosis and iron-dependent pathways in particular, have possible candidates for study in this context.Sinapic acid is an iron-chelator and high antioxidant bioactive phenolic acid. Its neuroprotective action, due to the antioxidant capacity, has been shown in several experimental models.However, the relationship between iron and antioxidant actions is still misunderstood and therefore, in the current study, we tried to investigate the effects of sinapic acid in rotenone-induced Parkinson's disease with the aspect of ferroptosis and iron-dependent alterations.The Parkinson's disease model was induced by a single dose intrastriatal and intrategmental rotenone (5µg/µl) injection.Sinapic acid (30mg/ kg) was orally administered during a 28-day period after the Parkinson's disease model was validated.Our results demonstrated that sinapic acid treatment attenuated rotenone-induced increase of serum transferrin and iron levels.Furthermore, sinapic acid inhibited rotenone-induced heme oxygenase-1(HO-1) increase and decrease of glutathione peroxidase-4 (GPx-4) levels in brain tissue. Also, sinapic acid treatment decreased motor impairment, likely as a result of the ameliorative effects on the tyrosine hydroxylase immunoreactivity loss after the rotenone insult.Our study suggests that the iron regulatory role of sinapic acid possibly plays a role in the protective effect on rotenone-induced neuronal damage.


Assuntos
Animais , Masculino , Ratos , Rotenona/efeitos adversos , Fármacos Neuroprotetores/agonistas , Ferro/efeitos adversos , Ferroptose
14.
Nutr. hosp ; 37(2): 374-383, mar.-abr. 2020. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-190603

RESUMO

INTRODUCCIÓN Y OBJETIVOS: el estrés oxidante se considera uno de los principales mecanismos de genotoxicidad y carcinogenicidad de los metales pesados. Por otra parte, el resveratrol posee propiedades antioxidantes y es uno de los polifenoles más estudiados debido a su gran variedad de efectos benéficos para la salud. Sin embargo, no hay revisiones sistemáticas de la literatura científica en las que se analicen los efectos del resveratrol sobre el estrés oxidante inducido por metales pesados. MÉTODOS: en esta revisión se realizó una búsqueda de artículos mediante las bases de datos PubMed® y ScienceDirect® (1996-2018). Después de aplicar diversos filtros, se consideraron once investigaciones in vivo e in vitro en las que se estudiaron los efectos del resveratrol sobre el estrés oxidante inducido por el arsénico (As), el cadmio (Cd), el cobre (Cu), el cromo (Cr) y el hierro (Fe). RESULTADOS: en la revisión se presenta un análisis de los efectos químicos del resveratrol sobre el estrés oxidante asociado a la exposición a compuestos metálicos. Se discute la interacción del resveratrol con la producción de especies reactivas de oxígeno (ERO) y el sistema antioxidante endógeno, y sus efectos sobre el daño del ADN. A partir de estos estudios se genera un diagrama que muestra las interacciones propuestas para el resveratrol, los metales pesados As, Cd, Cu, Cr y Fe, y el estrés oxidante. CONCLUSIONES: los estudios analizados muestran que el resveratrol es capaz de modular el estrés oxidante generado por diferentes compuestos de metales pesados como As, Cd, Cu, Cr y Fe


INTRODUCTION AND OBJECTIVES: oxidative stress is considered one of the main mechanisms of genotoxicity and carcinogenicity of heavy metals. In contrast, resveratrol has antioxidant properties and is one of the most studied polyphenols due to its wide variety of beneficial health effects. However, there are no systematic reviews of the scientific literature in which the effects of resveratrol on oxidative stress induced by heavy metals are analyzed. METHODS: in this review, articles were searched using the PubMed® and ScienceDirect® databases (1996-2018). After applying various filters, eleven in vivo and in vitro researches were considered, in which the effects of resveratrol on oxidative stress as induced by arsenic (As), cadmium (Cd), copper (Cu), chromium (Cr) and iron (Fe) were studied. RESULTS: this review presents an analysis of the chemical effects of resveratrol on the oxidative stress associated with exposure to metal compounds. The interaction of resveratrol with the production of reactive oxygen species (ERO), the endogenous antioxidant system, and the effects on DNA damage are discussed. From these studies a diagram that shows the proposed interactions for resveratrol, heavy metals As, Cd, Cu, Cr and Fe, and oxidative stress is generated. CONCLUSIONS: the studies analyzed show that resveratrol is able to modulate the oxidative stress generated by different heavy metal compounds such as As, Cd, Cu, Cr and Fe


Assuntos
Humanos , Estresse Oxidativo/efeitos dos fármacos , Metais Pesados/efeitos adversos , Resveratrol/uso terapêutico , Genotoxicidade , Cromo/efeitos adversos , Ferro/efeitos adversos , Cobre/efeitos adversos
15.
J. bras. nefrol ; 41(4): 472-480, Out.-Dec. 2019. tab, graf
Artigo em Inglês | LILACS | ID: biblio-1056605

RESUMO

Abstract Introduction: Anemic patients with chronic kidney disease (CKD) can be divided into anemic patients without or with functional iron deficiency (FID). The increase in the number of cases of hemosiderosis in patients on hemodialysis (HD) attributed to excessive intravenous iron replacement has called for the investigation of the factors involved in the genesis of FID. Objectives: This study aimed to describe the prevalence of FID in patients with CKD on HD, characterize the included individuals in terms of clinical and workup parameters, and assess their nutritional, oxidative stress, and inflammation statuses. This cross-sectional study assembled a convenience sample of 183 patients with CKD on HD treated in Southern Brazil. Patients meeting the inclusion and exclusion criteria were divided into two groups, one with anemic subjects with FID and one with anemic patients without FID. Participants answered a questionnaire probing into socio-epidemiological factors, underwent anthropometric measurements, and were tested for markers of anemia, oxidative stress, inflammation, and nutrition. Statistical analysis: The date sets were treated on software package GraphPad InStat version 3.1. Variables were tested with the Kolmogorov-Smirnov, chi-square, Student's t, and Mann-Whitney tests. Statistical significance was attributed to differences with a p < 0.05. Results: Markers of inflammation were not statistically different between the two groups. Markers of anemia and nutrition were significantly lower in patients with FID. Patients with FID were prescribed higher doses of parenteral iron (p < 0,05). Discussion: FID was associated with lower nutritional marker levels, but not to increased levels of markers of inflammation or oxidative stress, as reported in the literature. Additional studies on the subject are needed.


Resumo Introdução: A anemia na DRC pode ser dividida em anemia sem deficiência funcional de ferro e com deficiência funcional de ferro (ADFF). Diante do aumento dos casos de hemossiderose em pacientes em hemodiálise, atribuídos à reposição excessiva de ferro endovenoso, maiores conhecimentos sobre os fatores envolvidos na gênese da ADFF são importantes. Objetivos: documentar a prevalência de ADFF em renais crônicos em hemodiálise. Caracterizar clínica e laboratorialmente os portadores de ADFF em HD e avaliar o estado nutricional, estresse oxidativo e inflamatório. Estudo transversal, amostra de conveniência, envolvendo 183 renais crônicos em hemodiálise no sul do Brasil. Após aplicação dos critérios de exclusão, os pacientes foram separados em dois grupos: portadores de anemia com e sem deficiência funcional de ferro. Foram submetidos a questionário socioepidemiológico, à análise antropométrica e análise laboratorial dos marcadores de anemia, estresse oxidativo, inflamatórios e nutricionais. Análise estatística: programa GraphPad InStat versão 3.1. Foram aplicados os testes: Kolmogorov-Smirnov, qui-quadrado, t de Student e Mann-Whitney. Nível de significância adotado de 5%. Resultados: não houve diferença significativa nos marcadores inflamatórios entre os dois grupos. Houve diferença significativa nos marcadores de anemia e nutrição, significativamente menores nos pacientes com ADFF. Pacientes com ADFF receberam doses mais elevadas de ferro parenteral (p < 0,05). Discussão: ADFF esteve associada a menores valores de marcadores nutricionais, mas não esteve associada a marcadores inflamatórios ou de estresse oxidativo aumentados, como relatado na literatura. Estudos adicionais sobre o tema são necessários.


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Biomarcadores/metabolismo , Diálise Renal/efeitos adversos , Anemia Ferropriva/etiologia , Insuficiência Renal Crônica/complicações , Inflamação/metabolismo , Anemia/etiologia , Brasil/epidemiologia , Avaliação Nutricional , Prevalência , Estudos Transversais , Estresse Oxidativo/fisiologia , Anemia Ferropriva/epidemiologia , Administração Intravenosa , Hemossiderose/epidemiologia , Anemia/epidemiologia , Ferro/administração & dosagem , Ferro/efeitos adversos , Óxido Nítrico/metabolismo
16.
São Paulo; s.n; s.n; 2019. 60 p. graf, tab.
Tese em Português | LILACS | ID: biblio-1023080

RESUMO

A sobrecarga de ferro é uma condição prejudicial para os pacientes, que apresentam uma diminuição significativa na qualidade de vida. Os fármacos quelantes são moléculas que têm capacidade de uso clínico para atuar como atenuadores da sobrecarga de metais. Neste trabalho apresentamos uma análise de sideróforos do tipo hidroxamato e quinona, com o objetivo de ampliar a gama de terapia de sobrecarga de ferro. Para cada composto foi realizado um ensaio competitivo com a sonda calce- ína para verificar a capacidade de ligação do ferro, e um ensaio antioxidante baseado na supressão da oxidação dependente de ferro da dihidrorrodamina (DHR) sob ascorbato. Foi observado que o hidroxamato cíclico piridoxatina apresentou capacidade de sequestrar ferro de substratos de alta afinidade, tanto em meio tamponado quanto em meio intracelular. Em ambas as situações também se mostrou um antioxidante eficiente. Entretanto, parece ser o mais tóxico do grupo dos hidroxamatos (que ainda continha o hidroxamato linear desferricoprogênio e o aromático desferriastercromo). Outros compostos naturais também foram estudados como possíveis candidatos a fármacos para sobrecarga de ferro. Complexos de ferro foram caracterizados por espectrofotometria para avaliar a estequiometria possível, considerando os sítios de ligação para cada composto. Ensaios de fluorescência revelaram que entre os quatro compostos em estudo (ácido clorogênico, lapachol, hemateína e hematoxilina), o complexo entre ferro e hemateína apresenta maior estabilidade relativa do que outros


Iron overload is a harmful condition for patients, who have a significant decrease in life quality. Chelating drugs are molecules that have the capacity for clinical use to act as attenuators of metal overload. In this work we present an analysis of hydroxamate and quinone-type siderophores, intending to broaden the range of iron overload therapy. For each compound it was conducted a competitive assay with the fluorescent probe calcein to verify the iron binding ability, and an antioxidant assay based on suppression of the iron-dependent oxidation of dihydrorhodamine (DHR) under ascorbate. It was observed that cyclic hydroxamate pyridoxatin displayed good ability to scavenge iron from high affinity substrates both in buffer and in intracellular medium. It was also an efficient antioxidant in both setups. However, pyridoxatin seems to be the most toxic from the hydroxamate group (composed also by the linear desferricoprogen and the aromatic desferriasterchrome). Other natural compounds have also been studied as possible candidates for iron-overload drug therapy. Iron complexes were characterized by spectrophotometry to assess the possible stoichiometry considering the binding sites for each compound. Fluorescence assays revealed that among the four compounds in study (chlorogenic acid, lapachol, hematein and hematoxylin), the complex between iron and hematein has higher relative stability than others


Assuntos
Sideróforos/análise , Sobrecarga de Ferro/terapia , Fluorescência , Espectrofotometria/instrumentação , Terapia por Quelação , Desferroxamina/classificação , Ferro/efeitos adversos , Antioxidantes
17.
Rev. Rol enferm ; 41(11/12): 784-790, nov.-dic. 2018. ilus, tab, graf
Artigo em Espanhol | IBECS | ID: ibc-179771

RESUMO

El hierro es esencial para el mantenimiento de la salud. Su disminución está asociada con una reducción en la calidad de vida y un aumento en el número de hospitalizaciones. La terapia oral es económica y cómoda, pero no siempre bien tolerada, poco efectiva en presencia de ciertas enfermedades y con una adherencia muy pobre. Las nuevas moléculas de hierro intravenoso muestran mayor eficacia y seguridad. Esto ha hecho que se conviertan en la vía de elección cuando se trata de repleciones rápidas y con altos requerimientos, así como en procesos renales o digestivos inflamatorios crónicos. El hierro a altas dosis permite reducir el número de infusiones, preservando los accesos venosos del paciente, además de reducir el coste sanitario


Iron is essential for maintaining health. Its decrease is associated with a reduction in the quality of life and an increase in the number of hospitalizations. Oral therapy is economical and convenient but not always well tolerated, ineffective in the presence of certain diseases and with a high rate of low adherence. New molecular intravenous iron preparations show greater effectiveness and safety. This has made it the route choice when it comes to rapid high demanding repletion, as well as in chronic inflammatory renal or digestive processes. High-dose iron decreases the frequency of hospital visits and preserves venous access by reducing the number of punctures, resulting in lower healthcare costs


Assuntos
Humanos , 16595/terapia , Ferro/administração & dosagem , Administração Intravenosa/enfermagem , Cuidados de Enfermagem/métodos , Dispositivos de Acesso Vascular , Ferro/efeitos adversos
20.
Rev. esp. geriatr. gerontol. (Ed. impr.) ; 53(1): 38-44, ene.-feb. 2018. tab
Artigo em Espanhol | IBECS | ID: ibc-169809

RESUMO

Introducción. No existen estudios previos que evalúen el efecto de la ferroterapia intravenosa sobre la situación funcional y cognitiva de pacientes con fractura de cadera (FC). Material y métodos. Ensayo clínico unicéntrico aleatorizado, controlado con placebo, doble ciego en grupos paralelos, para comparar la eficacia del tratamiento con hierro intravenoso perioperatorio en pacientes ancianos intervenidos de FC. Se asegura el enmascaramiento del tratamiento, envolviendo el fármaco y el sistema de infusión. El grupo intervención recibirá, los días 1, 3 y 5 de ingreso, 200mg de Venofer (R ) (hierro sacarosa), diluidos en 100ml de suero salino y el control, 100ml de suero salino los días 1, 3 y 5 de ingreso. Los pacientes reciben la asistencia convencional en la Unidad de Ortogeriatría del Hospital Universitario Infanta Sofía. Para valorar el impacto del tratamiento, se recogen variables funcionales (actividades de la vida diaria y capacidad de deambulación), cognitivas (situación cognitiva previa y delirium), quirúrgicas, demográficas y clínicas durante el ingreso y se realiza un análisis de seguridad del tratamiento. Los pacientes reciben seguimiento a los 3, 6 y 12 meses. Resultados. El estudio reportará evidencia acerca del impacto de la administración de hierro intravenoso sobre la recuperación funcional a corto y medio plazo. Permitirá evaluar si la administración de ferroterapia intravenosa tiene algún efecto negativo sobre la incidencia de delirium postoperatorio. Aportará información acerca de la seguridad de la administración de ferroterapia intravenosa en pacientes ancianos con FC y su repercusión sobre el ahorro transfusional. Conclusiones. La inclusión de los pacientes ancianos con FC ingresados en una unidad de ortogeriatría en el ensayo clínico permitirá la evaluación del impacto del fármaco en un escenario habitual, y aportará datos valiosos para la protocolización de su uso en otras unidades (AU)


Introduction. There are no previous studies evaluating the effect of intravenous iron therapy on functional and cognitive status of patients with hip fracture (HF). Material and methods. A single-centre randomised, placebo-controlled, double-blind and parallel treatment, clinical trial has been designed to assess the efficacy of intravenous iron therapy during the peri-operative period in elderly patients suffering from a HF. Blinding will be ensured by the packaging of the drug infusion system. On days 1, 3, and 5 from admission, the intervention group will receive 200mg Venofer (R ) (iron sucrose) diluted in 100ml saline, and the control group 100ml saline, also on days 1, 3 and 5. Patients will received conventional treatment in ortho-geriatric unit of the Hospital Infanta Sofia. Functional variables (activities of daily living and walking), cognitive (cognitive status and delirium), surgical, demographic and clinical characteristics will be collected during admission in order to assess the impact of treatment. A safety analysis of the treatment will also performed. Patients will be followed-up at 3, 6, and 12 months. Results. The study will attempt to provide evidence on the impact of the intravenous iron administration on functional recovery. It will be determined whether iron therapy negatively affects the incidence of post-operative delirium. Finally, report will be presented on the safety data of intravenous iron in elderly HF patients, as well as the impact on allogenic blood transfusion savings. Conclusions. The inclusion of elderly HF patients admitted to an ortho-geriatric unit, in a clinical trial, will help to improve the knowledge of the treatment impact on a usual scenario, and provide useful data for use in other units (AU)


Assuntos
Humanos , Idoso , Ferro/administração & dosagem , Delírio/induzido quimicamente , Fraturas do Quadril/terapia , Administração Intravenosa , Recuperação de Função Fisiológica , Placebos/uso terapêutico , Transfusão de Sangue , Complicações Pós-Operatórias/prevenção & controle , Ferro/efeitos adversos
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