ABSTRACT
Resumen Objetivo: Analizar las propiedades psicométricas de la escala de resiliencia de Wagnild y Young, versión argentina, en un grupo de personas adultas mayores costarricenses. Materiales y métodos: Se contó con un grupo piloto (N = 40, X = 69.38) y otro para el análisis de las propiedades psicométricas (N = 100, X = 69.31). Se utilizó la escala de resiliencia de Wagnild y Young, versión argentina, de 25 ítems. Se efectuó un análisis por juicio de personas expertas y un estudio piloto, para establecer la escala por validar; posterior a esto, se realizó el estudio de validación completo. Se aplicaron análisis factoriales y alfa de Cronbach. Resultados: El análisis factorial extrajo dos factores denominados: a) "capacidad de autoeficacia" y b) "capacidad de propósito y sentido de vida". La consistencia interna en el nivel global fue 0.84 (21 ítems); para el primer factor, 0.81, y para el segundo factor, 0.74. Conclusiones: El instrumento es confiable y válido para valorar los niveles de resiliencia desde una óptica integral e interdisciplinaria, en una población de personas adultas mayores con las características similares a las de la muestra estudiada. A futuro, se recomienda realizar análisis cualitativos para delimitar mejor los constructos, con base en las características de la población.
Abstract Purpose: To analyze the psychometric characteristics of the Wagnild and Young Resilience Scale Argentine version in a Costa Rican elderly group. Materials and methods: The study had two groups, one for the pilot study (N = 40, X = 69.38), and another for the analysis of the psychometric properties (N = 100, X = 69.31). The 25-item Wagnild and Young Resilience Scale, Argentine version, was used. An analysis by expert judgment and a pilot study were carried out to establish the scale to be validated, after which, the complete validation study was carried out. Factor analyzes and Cronbach's alpha were applied. Results: They were obtained two factors named: a) "selfefficacy capacity", and b) "purpose in life capacity". The global internal consistency was 0.84, for the first factor was 0.81 and for the second factor was 0.74. Conclusions: The scale generated is reliable and valid to assess resilience in an elderly people with similar characteristics to the present study. In the future, it is recommended to carry out qualitative analyzes to better define the constructs based on the characteristics of the population.
Resumo Objetivo: Analisar as propriedades psicométricas da Escala de Resiliência Wagnild e Young, versão argentina, em um grupo de pessoas idosas costarriquenhas. Materiais e métodos: Um grupo piloto (N = 40, X = 69,38) e outro grupo para a análise das propriedades psicométricas (N = 100, X = 69,31) foram utilizados. A Escala de Resiliência Wagnild e Young, versão argentina, com 25 itens, foi utilizada. Para estabelecer a escala a ser validada, foi realizada uma análise de julgamento por especialistas e um estudo piloto, após o qual foi realizado o estudo de validação completo. A análise fatorial e o alfa de Cronbach foram aplicados. Resultados: A análise fatorial extraiu dois fatores: a) "capacidade de autoeficácia" e b) "capacidade de propósito e significado na vida". A consistência interna ao nível global foi de 0,84 (21 itens); para o primeiro fator foi de 0,81 e para o segundo fator foi de 0,74. Conclusões: O instrumento é confiável e válido para avaliar níveis de resiliência a partir de uma perspectiva holística e interdisciplinar em uma população de idosos com características semelhantes às da amostra estudada. Recomendam-se futuras análises qualitativas para melhor delimitar as construções com base nas características da população.
ABSTRACT
The aim of the present study is to evaluate the possible influence of virgin olive oil (VOO) on the effect of acetylsalicylic acid (ASA) in platelet aggregation, prostanoid and NO production and retinal vascular pattern in rats with experimental type 1-like diabetes. We used 100 male Wistar rats that were distributed into five groups: (1) non-diabetic rats (NDR); (2) untreated diabetic rats (DR); (3) DR treated with ASA (2 mg/kg per d per os (p.o.)); (4) DR treated with VOO (0.5 ml/kg per d p.o.); (5) DR treated with ASA plus VOO. The duration of diabetes was 3 months, and each treatment was administered from the first day of diabetes. Variables that were quantified were platelet aggregation (I(max)), thromboxane B(2) (TxB(2)), aortic prostacyclin (6-keto-PGF(1alpha)) and NO, and the percentage of retina with horseradish peroxidase-permeable vessels (HRP-PV). Diabetic rats showed a higher I(max) (35 %) and TxB(2) (63 %) than NDR, and a lower 6-keto-PGF(1alpha), NO and HRP-PV than NDR ( - 74.6 %). ASA and VOO administration reduced these differences and prevented the percentage of HRP-PV ( - 59.7 % with ASA and - 46.7 % with VOO). The administration of ASA plus VOO showed a strong platelet inhibition (80.2 v. 23.4 % for VOO and 50.6 % for ASA+VOO, P < 0.0001), and reduced HRP-PV differences to - 31.6 % (P < 0.001 with respect to DR and P < 0.0001 with respect to DR treated with ASA). In conclusion, the administration of VOO to rats with type 1-like diabetes mellitus improves the pharmacodynamic profile of ASA, and increases its retinal anti-ischaemic effect.
Subject(s)
Aspirin/pharmacology , Diabetes Mellitus, Experimental/drug therapy , Olea/chemistry , Plant Oils/pharmacology , Platelet Aggregation Inhibitors/pharmacology , Retinal Vessels/drug effects , Animals , Aorta , Aspirin/therapeutic use , Diabetes Mellitus, Experimental/blood , Drug Therapy, Combination , Horseradish Peroxidase , Male , Nitric Oxide/blood , Olive Oil , Permeability/drug effects , Plant Oils/therapeutic use , Platelet Aggregation/drug effects , Platelet Aggregation Inhibitors/therapeutic use , Rats , Rats, Wistar , Thromboxane B2/bloodABSTRACT
Clinical studies have shown that the ability of aspirin to prevent cerebrovascular accidents is weaker in patients with diabetes. The aim of this study was to determine whether high concentrations of glucose modified the effect of aspirin, ticlopidine and clopigodrel on platelet function and platelet-subendothelium interactions. This in vitro study tested three different concentrations of glucose. The effects were analyzed by comparing platelet aggregometry in whole blood, nitric oxide and prostacyclin production in cultures of human endothelial cells, and by quantitative analysis of morphological features of the platelet-subendothelium interaction under flow conditions. High concentrations of glucose increased platelet aggregation (13.9 Omega with 5 mM glucose vs. 21.6 Omega with 16.6 mM) and platelet-subendothelium interactions (28.9% with 5 mM glucose vs.35.2% with 16.6 mM), and decreased nitric oxide and prostacyclin production. In the presence of high concentrations of glucose, the antiaggregant effect of aspirin and its influence on nitric oxide production were diminished (IC50 54 microM with 5 mM glucose vs.556 microM with 16.6 mM glucose), and its effect on the platelet-subendothelium interaction was reduced (10.5% platelet occupancy with 5 mM glucose vs.23% with 16.6 mM glucose). The effects of ticlopidine and clopidogrel were not significantly modified.
Subject(s)
Aspirin/pharmacology , Blood Platelets/drug effects , Glucose/administration & dosage , Ticlopidine/analogs & derivatives , Ticlopidine/pharmacology , Adult , Blood Platelets/cytology , Blood Platelets/physiology , Clopidogrel , Dose-Response Relationship, Drug , Endothelium, Vascular/cytology , Endothelium, Vascular/drug effects , Endothelium, Vascular/physiology , Humans , Male , Middle Aged , Platelet Aggregation/drug effects , Platelet Aggregation/physiologyABSTRACT
Clopidogrel is an antiplatelet drug that belongs to the group of thienopyridines. Because of its main mechanism of action most studies of clopidogrel have centered on the platelet ADP pathway. The aim of the present study was to compare the effects of clopidogrel, ticlopidine, and aspirin, on platelet activation by collagen (the main inducer of platelet activation in vivo), prostanoid, and NO production, and the effects on blood perfusion experiments. Clopidogrel inhibited platelet aggregation induced in whole blood by collagen and TxB2 production to a greater extent than did ticlopidine. Prostacyclin synthesis did not change after incubation with thienopyridines, whereas aspirin inhibited synthesis in a dose-dependent manner. Thienopyridines increased NO production to a greater extent than did aspirin. All three drugs impaired the platelet-subendothelium interaction under flow conditions. With thienopyridines, the presence of endothelium did not modify the percentage of the surface coated by platelets.
