ABSTRACT
BACKGROUND: Results of studies examining the influence of age on thyroid function and TSH levels, in the absence of thyroid disease, remain controversial. The aim of this study was to determine the course of thyroid function over 11 years in a population with normal thyroid function. METHODS: This is a population-based prospective study started in 1995-1997 (first phase), and reassessed 6 (second phase) and 11 years later (third phase). RESULTS: The TSH and FT4 in the third phase were significantly increased (p=0.001 and p=0.001, respectively), with the values being higher particularly from the age of 50 years. In those persons with a baseline TSH≥1.2 and <3 µIU/mL, the OR of having a TSH of 3-5 µIU/mL in the third phase was 6.10 (p=0.004). In those with a baseline TSH≥3 and ≤5 µIU/mL, the OR of having a TSH of 3-5 µIU/mL in the third phase was 20.8 (p<0.0001). Similar results were found for FT4. CONCLUSION: In a population free of clinical thyroid disease, TSH and FT4 values rise over the years. This increase occurs in all age groups, but depends mainly on the basal concentrations of TSH and FT4.
Subject(s)
Aging , Thyroid Gland/physiology , Adolescent , Adult , Aged , Female , Humans , Longitudinal Studies , Male , Middle Aged , Prospective Studies , Spain , Thyroid Function Tests , Thyrotropin/blood , Young AdultABSTRACT
OBJECTIVE: To assess glycemic variability, oxidative stress and their relationship in children and adolescents with type 1 diabetes (T1DM) attending a summer camp. PATIENTS AND METHOD: Cross-sectional study that included 54 children and adolescents with T1DM aged 7-16, attending a 7 day summer camp. Sociodemographic information, clinical data, and blood glucose values measured using an Accu-Chek Nano® glucose meter were recorded. Glucose variability markers (standard deviation [SD], low blood glucose index [LBGI], high blood glucose index [HBGI], mean amplitude of glycemic excursions [MAGE] and mean of daily differences [MODD]) were calculated. Oxidative stress was assessed by the measurement of 8-iso-prostaglandin F2 alpha (PGF2α) in a 24-hour urine sample collected at the end of the camp in 14 children. RESULTS: The Median SD, MAGE and MODD indexes were in the high range (61, 131 and 58 mg/dl, respectively), LBGI in the moderate range (3.3), and HBGI in the low range (4.5). The mean HbA1c was 7.6% and the median urinary excretion rate of 8-iso-PGF2α was 864.39 pg/mg creatinine. The Spearman correlation coefficients between markers of glycemic variability (SD, HBGI, MAGE, MODD) were significant. Non-significant correlations were found between markers of glycemic variability and urinary 8-iso-PGF2α. CONCLUSIONS: High glycemic variability was observed in children and adolescents attending a summer camp. However, no correlations were found between markers of glycemic variability and oxidative stress measured by urinary 8-iso-PGF2α. Further studies are needed to address the relationship between oxidative stress and glycemic variability in children with T1DM.
Subject(s)
Blood Glucose/analysis , Diabetes Mellitus, Type 1/metabolism , Oxidative Stress , Adolescent , Child , Cross-Sectional Studies , Diabetes Mellitus, Type 1/blood , Diabetes Mellitus, Type 1/urine , Dinoprost/analogs & derivatives , Dinoprost/urine , Female , Humans , Male , SeasonsABSTRACT
The aim of this study was to assess the relationship between obesity and vitamin D status cross-sectionally, the relationship between obesity and the incidence of hypovitaminosis D prospectively and inversely the relationship between vitamin D status and incidence of obesity in a population-based cohort study in Spain. At baseline (1996-1998), 1226 subjects were evaluated and follow-up assessments were performed in 2002-2004 and 2005-2007, participants undergoing an interview and clinical examination with an oral glucose tolerance test. At the second visit, 25-hydroxyvitamin D and intact parathyroid hormone concentrations were also measured. Prevalence of obesity at the three visits was 28.1, 36.2 and 39.5%, respectively. The prevalence of vitamin D deficiency (25-hydroxyvitamin D ≤ 20 ng/ml (≤ 50 nmol/l)) was 34.7%. Neither obesity at baseline (OR=0.98, 95% CI: 0.69-1.40, P=0.93) nor the development of obesity between baseline and the second evaluation (OR=0.80, 95% CI: 0.48-1.33, P=0.39) were significantly associated with vitamin D status. In subjects who were non-obese (BMI <30 kg/m²) at the second evaluation, 25-hydroxyvitamin D values ≤ 17 ng/ml (≤ 42.5 nmol/l) were significantly associated with an increased risk of developing obesity in the next 4 years (OR=2.35, 95% CI: 1.03-5.4, P=0.040 after diverse adjustments). We conclude that vitamin D deficiency is associated with an increased risk of developing obesity.
Subject(s)
Obesity/epidemiology , Vitamin D Deficiency/epidemiology , Adolescent , Adult , Aged , Body Mass Index , Calcifediol/blood , Cohort Studies , Cross-Sectional Studies , Female , Follow-Up Studies , Humans , Incidence , Male , Middle Aged , Obesity/blood , Obesity/etiology , Prevalence , Prospective Studies , Risk , Spain/epidemiology , Vitamin D Deficiency/blood , Vitamin D Deficiency/physiopathology , Young AdultABSTRACT
Antecedentes: Aunque en la literatura se ha subrayado la importancia de la adherencia al tratamiento para el correcto control metabólico, parte de los pacientes con diabetes continúa manteniendo una baja adherencia terapéutica. La personalidad parece ser una variable relevante. Objetivos: Estudiar la adherencia de pacientes adultos con diabetes tipo 1 al tratamiento con sistema integrado de infusión subcutánea continua de insulina (ISCI) y monitorización continua de glucosa intersticial a tiempo real (MCG-TR). Materiales y métodos: Veinte pacientes con diabetes tipo 1 de larga evolución recibieron tratamiento intensivo de insulina mediante un sistema integrado de infusor subcutáneo de insulina (ISCI) y monitorización continua de glucosa a tiempo real (MCG-TR) durante 6 meses. Se utilizaron el inventario de personalidad de Millon (MCMI-II) y una escala de satisfacción. Resultados: Los pacientes con diabetes mellitus tipo 1 que abandonaron el tratamiento tuvieron mayores puntuaciones en las escalas de histrionismo, narcisismo, agresividad y abuso de drogas, así como peor control metabólico y mayor insatisfacción con el tratamiento. Conclusiones: El perfi l de los pacientes que abandonaron el tratamiento fue de insatisfacción con el tratamiento (sistema integrado ISCI más MCG-TR) que no mejora el control metabólico, estilo de personalidad caracterizado por histrionismo, narcisismo y agresividad, e historia reciente o recurrente de abuso de drogas, con difi cultad para reprimir los impulsos o mantenerlos dentro de los límites sociales convencionales (AU)
Background: Although it has been reported the importance of adherence toprescribed treatment to maintain an adequate metabolic control, a proportionof patients with diabetes have a low adherence to treatment. Personality seems to be an important variable. Objectives: To study the adherence of adult patients with type 1 diabetes to treatment with integrated system of continuous insulin infusion (CSII) and real time continuous glucose subcutaneous monitoring system (RT-CGMS). Materials and methods: Twenty patients with longduration type 1 diabetes received intensive treatment with CSII and RT-CGMS during 6 months. Millon personality inventory (MCMI-II) and a satisfaction scale were employed. Results: Patients with type 1 diabetes who abandoned the treatment, had higher scores on the dimensions of histrionism, narcissism, aggressivenessand drug abuse, as well as worse glycemic control, and weremore dissatisfied with the treatment. Conclusions: Profile of patients whodecide to leave the treatment was of patients dissatisfied with treatment (CSII and RT-CGMS) which does not improve metabolic control, personality style characterized by histrionism, narcissism and aggressiveness, and recent or recurrent history of abuse of drugs, with difficulty to repress impulses or to maintain them inside the conventional social limits(AU)
Subject(s)
Humans , Diabetes Mellitus, Type 1/drug therapy , Insulin Infusion Systems , Insulin/administration & dosage , Monitoring, Physiologic , Patient Compliance , Glycemic IndexABSTRACT
We undertook a population-based cohort study in Pizarra (Spain). Anthropometric and nutritional variables were recorded for 613 persons. The type of fat used was determined by measurement of the fatty acids contained in cooking oil. Serum fatty acid was used as a biological marker of the type of fat consumed. Obesity incidence in persons who were not obese at baseline was greater in those who consumed sunflower oil (Group 1: 41.5 (95% CI, 25.4-67.8) cases per 1000 person-years) than in those who consumed olive oil or a mixture of oils (Group 2: 17.3 (95% CI, 11.6-25.8) cases per 1000 person-years). The risk of developing obesity over 6 years, adjusted for age, sex, physical activity, smoking, instruction level, energy intake and baseline BMI, was 2.3 (95% CI, 1.06-5.02) in group 1 compared with that in group 2. The increase in the prevalence of obesity in the free-living population is associated with the type of fatty acids in the diet.
Subject(s)
Dietary Fats, Unsaturated/administration & dosage , Fatty Acids, Unsaturated/blood , Obesity/epidemiology , Plant Oils/administration & dosage , Adolescent , Adult , Aged , Chromatography, Gas , Cohort Studies , Cooking , Diet Surveys , Dietary Fats, Unsaturated/analysis , Dietary Fats, Unsaturated/metabolism , Feeding Behavior , Female , Humans , Incidence , Male , Middle Aged , Obesity/blood , Obesity/etiology , Olive Oil , Plant Oils/analysis , Plant Oils/metabolism , Risk Factors , Spain/epidemiology , Sunflower Oil , Young AdultABSTRACT
BACKGROUND: Few European studies have used an oral glucose tolerance test (OGTT) to examine the incidence of type 2 diabetes. We determined the incidence of impaired fasting glucose (IFG), impaired glucose tolerance (IGT) and type 2 diabetes in a population from southern Spain. MATERIAL AND METHODS: A population-based cohort study was undertaken in Pizarra, Spain. Baseline data were recorded on age, sex, weight, height, waist and hip circumferences, and diabetes status for 1051 persons, of whom 910 were free of type 2 diabetes (at-risk sample). Of these, 714 completed the 6-year follow-up study. Body mass index, waist-to-hip ratio and weight increase since baseline were calculated. The homeostasis model assessment equations were used to estimate the indices of insulin resistance and beta-cell function. Each person received an OGTT at baseline and after 6 years. RESULTS: Type 2 diabetes developed in 81 people for a total of 4253 person-years, representing an incidence of 19.1 cases per 1000 person-years (95% confidence interval, 15.3-23.6). Age and the presence of obesity, central obesity and carbohydrate metabolism disorders [IFG (cut off = 100 mg dL(-1), capillary blood glucose level), IGT or both] at baseline were significant markers for the onset of type 2 diabetes during follow-up. After adjusting for these variables, multivariate analysis showed weight increase, waist-to-hip ratio and the indices of insulin resistance and beta-cell function were significantly associated with the risk for type 2 diabetes. CONCLUSIONS: The incidence of type 2 diabetes in a population from southern Spain is high. It is probably associated with the high prevalence of obesity and weight increase in this population.
Subject(s)
Diabetes Mellitus, Type 2/epidemiology , Adolescent , Adult , Aged , Blood Glucose/metabolism , Diabetes Mellitus, Type 2/blood , Fasting/blood , Fasting/metabolism , Female , Glucose Tolerance Test/methods , Humans , Male , Middle Aged , Spain/epidemiologyABSTRACT
En la segunda mitad del siglo XX, la medicina ha cambiado más que en toda su historia anterior. Este cambio ha sido la consecuencia no sólo de los avances científicos y técnicos, sino también de los cambios del modelo social. Los pacientes han dejado de ser personas pasivas y han pasado a disfrutar de un creciente protagonismo en la toma de decisiones: es la manera de llevar a la práctica el principio de autonomía, que, junto con los principios de beneficencia y de justicia, constituyen los pilares básicos de la ética médica. Pero la autonomía no es real si el paciente no disfruta de los instrumentos para ejercerla realmente. La educación terapéutica es el mejor instrumento para transferir información desde el médico y el sistema sanitario hacia el paciente. La diabetes mellitus es el prototipo de enfermedad crónica susceptible de beneficiarse de la participación activa del paciente. Los programas de educación de pacientes diabéticos han pasado a formar parte de los espacios establecidos de atención clínica de la diabetes. Por lo general, hasta no hace mucho los servicios clínicos carecían de experiencia en la introducción de la educación como parte de la terapéutica clínica. No es sorprendente, pues, que la manera de organizar la educación de los pacientes haya sido muy diversa: dependía de la capacidad de cada servicio para dar respuesta a los nuevos retos, pero también, y sobre todo, de la sensibilidad y la cultura que se tuviera sobre la relación médico-enfermo. Así, aunque se ha hecho un esfuerzo por estandarizar la educación terapéutica, lo cierto es que ha habido tantos programas como espacios donde se ha puesto en marcha. En el presente artículo se reflexiona sobre la educación de pacientes desde la experiencia de más de 20 años en un servicio de endocrinología y nutrición
In the second half of the 20th century, the field of «Medicine» underwent more changes than throughout its entire previous history. This transformation has been the consequence not only of scientific and technical advances, but of changes in the social model as well. Patients have gone from being passive individuals to having an increasingly prominent role in the decision-making process. This is the manner of putting into practice the principle of autonomy, which, together with the principles of beneficence and justice, is a mainstay of medical ethics. However, this autonomy is not real if the patient is not provided with the tools he or she needs to actually exercise it. Therapeutic education is the best tool for transferring information from the physician and health care system to the patient. Diabetes mellitus represents the prototype of the chronic diseases that could benefit from the active participation of the patient. Education programs for diabetic patients have become a part of the conventional ambit of clinical care in diabetes. The staffs of clinical services generally lack experience in the introduction of education as a part of clinical therapeutics. Thus, it is not surprising that the approach to organizing patient education has varied widely. It has depended on the capacity of each service to respond to the new challenges, but, above all, on the existing sensitivity and culture with respect to the physician-patient relationship, as well. Although there has been an effort to standardize therapeutic education, the truth is that there have been as many programs as settings in which they have been introduced. In the present article, the authors reflect on patient education, following more than twenty years of experience in an endocrinology and nutrition department
Subject(s)
Male , Female , Humans , Patient Education as Topic/methods , Diabetes Mellitus/epidemiology , Health Knowledge, Attitudes, Practice , Patient Care , Physician-Patient Relations , Patient Education as Topic/organization & administration , Patient Education as Topic/trends , Hospitals, University/statistics & numerical data , Hospitals, University/trends , Hospitals, UniversityABSTRACT
OBJECTIVE: Few epidemiological studies have examined the relationship of dietary fatty acids, especially MUFA, with the interrelation between insulin secretion and insulin resistance. We assessed the relation of dietary fatty acids with insulin secretion in a free-living population. DESIGN AND SETTING: This cross-sectional, population-based study was undertaken in Pizarra, a small town in Spain. SUBJECTS AND METHODS: Anthropometrical data were collected for 1226 persons selected randomly from the municipal census, 538 of whom (randomly chosen) were given a prospective, quantitative, 7-day nutritional questionnaire. The fatty acid composition of the serum phospholipids was used as a biological marker of the type of fat consumed. Beta-cell function (betaCFI) and insulin-resistance index (IRI) were estimated by the Homeostasis Model Assessment. RESULTS: To determine which factors influence the variability of the betaCFI, we analyzed the variance of the betaCFI according to sex, the presence of carbohydrate metabolism disorders and the different components of the diet, adjusting the models for age, body mass index (BMI) and IRI. The dietary MUFA and polyunsaturated fatty acids (PUFA) contributed to the variability of the betaCFI, whereas only the proportion of serum phospholipid MUFA, but neither the saturated fatty acids nor the PUFA accounted for part of the variability of the betaCFI in a multiple regression analysis. CONCLUSION: The results of this population-based study corroborate the results of other clinical and experimental studies suggesting a favorable relationship of MUFA with beta-cell insulin secretion. SPONSORSHIP: Fondo de Investigación Sanitaria, Junta de Andalucía and the Asociación Maimónides.
Subject(s)
Diet , Dietary Fats, Unsaturated/administration & dosage , Fatty Acids, Monounsaturated/administration & dosage , Insulin Resistance , Insulin-Secreting Cells/physiology , Insulin/metabolism , Adult , Cross-Sectional Studies , Diet Surveys , Female , Humans , Insulin Secretion , Insulin-Secreting Cells/metabolism , Male , Prospective Studies , Regression Analysis , Spain , Surveys and QuestionnairesABSTRACT
AIMS: Genes of the Apo AI/CIII/AIV cluster on chromosome 11 have been related to plasma lipid patterns. The close relationship between carbohydrate metabolism and lipid metabolism warrants investigation of the association between this cluster and Type 2 diabetes mellitus. We therefore examined the possible association between polymorphisms of this cluster and Type 2 diabetes mellitus as part of a study of the prevalence of diabetes and the metabolic syndrome in southern Spain. METHODS: A total of 1224 persons were selected randomly from the town of Pizarra in the province of Malaga, southern Spain. The sample errors for the prevalence of Type 2 diabetes mellitus and the three polymorphisms studied were all < or = 4%. All subjects underwent phenotyping after an oral glucose tolerance test (75 g) (WHO 1998 criteria) and the XmnI and MspI polymorphisms of Apo AI and the SstI polymorphism of Apo CIII were genotyped. RESULTS: Those subjects with the mutated AA genotype of the MspI polymorphism (-75 G-->A) of Apo AI had a greater risk of impaired glucose tolerance [odds ratio (OR) = 1.95, CI = 1.02-3.8, P = 0.05], Type 2 diabetes mellitus, both known (OR = 7.38, CI = 1.3-39.7, P = 0.02) and unknown (OR = 3.7, CI = 1.4-9.9, P = 0.009). This risk was independent of age, sex, obesity, triglyceride level, HDL cholesterol and pattern of insulin resistance. CONCLUSIONS: Pending confirmation in prospective studies, the AA genotype of the MspI polymorphism of the Apo AI gene, within the Apo A-I/C-III/A-IV cluster, seems to be a risk factor for Type 2 diabetes mellitus.
Subject(s)
Apolipoprotein A-I/genetics , Apolipoproteins C/genetics , Diabetes Mellitus, Type 2/genetics , Polymorphism, Genetic , Adult , Aged , Apolipoprotein A-I/blood , Apolipoproteins C/blood , Cross-Sectional Studies , Female , Genetic Predisposition to Disease , Humans , Male , Middle Aged , Phenotype , Prospective Studies , SpainABSTRACT
Recent studies have confirmed important regional differences in the prevalence of obesity, as well as a tendency for this prevalence to increase. Determination of the social factors involved in obesity may be very useful to design intervention and prevention strategies. This transverse study was undertaken in Pizarra (Malaga, Spain) from a random sample of the population between 18 and 65 years of age (n = 1226). All participants were interviewed and given a physical examination. Standardized anthropometrical measurements were made, and a baseline blood sample was taken after an oral glucose tolerance test. The overall prevalence of obesity (BMI > 30 kg/m2) was 28.8%. This figure increased continuously from 10% in the group aged 18-25 years to above 50% in the groups aged over 55 years. This prevalence is higher than that reported in most other studies in Spain. The obese persons ate differently, at least from a qualitative viewpoint, probably more saturated fats and fewer unsaturated fats, and had a different behaviour concerning alcohol and smoking. Marital status was related with the rate of obesity, and the close relation between the level of education and the risk of obesity was confirmed (OR = 3.8 for being obese and having no education compared to having university studies). The most important consequence of the study was that all these factors are potentially modifiable and preventable. An increased level of general education in the population may well contribute decisively to a reduction in the prevalence of obesity.
Subject(s)
Health Behavior , Obesity/epidemiology , Adolescent , Adult , Age Factors , Body Mass Index , Educational Status , Exercise , Female , Humans , Interviews as Topic , Male , Marital Status , Middle Aged , Prevalence , Risk Factors , Risk-Taking , Socioeconomic Factors , Spain/epidemiologyABSTRACT
AIM: To evaluate the relation between type of dietary fatty acid and degree of insulin resistance. DESIGN: A cross-sectional study. METHODS: Anthropometrical data were measured in 538 subjects, aged 18-65 Years, selected randomly from the municipal census of Pizarra (Spain). An oral glucose tolerance test (OGTT) was given to all subjects and measurements were made of glycemia, insulinemia and the proportion of fatty acids in plasma phospholipids. Insulin resistance (IR) was estimated by homeostasis model assessment. Samples of cooking oil being used were obtained from the kitchens. The strength of association between variables was measured by calculating the odds ratio (OR) from logistic models, and the relationships were measured by linear correlation coefficients. RESULTS: Insulin resistance was significantly less in people who used olive oil compared with those who used sunflower oil or a mixture. Statistical significance remained in the group of people with normal OGTT after adjusting for obesity. In the whole sample, IR correlated negatively with the concentration of oleic acid (r=-0.11; P=0.02) and positively with that of linoleic acid (r=0.10; P=0.02) from the cooking oil. In subjects with normal OGTT, IR correlated negatively with oleic acid from cooking oil (r=-0.17; P=0.004) and from plasma phospholipids (r=-0.11; P=0.01) and positively with the concentration of linoleic acid in cooking oil (r=0.18; P=0.004) and plasma phospholipids (r=0.12; P=0.005). The risk (OR) of having raised IR was significantly lower in people who consumed olive oil, either alone (OR=0.50) or mixed (OR=0.52) compared with those who consumed only sunflower oil. CONCLUSION: There is an association between the intake of oleic acid, the composition of oleic acid in plasma phospholipids and peripheral insulin action.
Subject(s)
Dietary Fats/administration & dosage , Insulin Resistance , Oleic Acid/administration & dosage , Adolescent , Adult , Aged , Cooking , Cross-Sectional Studies , Female , Humans , Male , Middle Aged , Oleic Acid/blood , Olive Oil , Phospholipids/blood , Plant Oils/administration & dosage , SpainABSTRACT
Autoantibodies against epitopes of oxidized low-density lipoprotein (LDL), initially shown in human sera, were later related with the atherosclerotic process, although recent studies have questioned this association. Moreover, their association with total cholesterol and plasma LDL, or with the other lipoproteins, is not clear. We studied the relation between the levels of autoantibodies to oxidized LDL and lipoproteins in a population of 400 subjects from the lower Guadalhorce area in Malaga, Spain. Anti-oxidized LDL antibodies were measured by enzyme-linked immunosorbent assay (ELISA), and total cholesterol, triglycerides, high-density lipoprotein (HDL) cholesterol, and lipoprotein(a) [Lp(a)] were measured with commercial kits. Subjects who were positive for anti-oxidized LDL antibodies had significantly lower levels of total cholesterol (P <.01) and LDL cholesterol (P <.01). There was a negative correlation between titers of anti-oxidized LDL antibodies and levels of total cholesterol (P =.007) and LDL cholesterol (P =.024). This inverse relation between the levels of anti-oxidized LDL antibodies and the levels of total cholesterol and LDL cholesterol in a large population study, together with the discordances already published, suggests that the relation between anti-oxidized LDL antibodies, arteriosclerosis, and lipids is more complex than initially thought.
Subject(s)
Autoantibodies/blood , Cholesterol/blood , Lipoproteins, LDL/immunology , Adult , Aged , Blood Pressure , Cholesterol, HDL/blood , Cholesterol, LDL/blood , Female , Humans , Lipoproteins, LDL/blood , Male , Middle Aged , Reference Values , Spain , Triglycerides/bloodABSTRACT
OBJECTIVES: In July 1995 we began noticing an unusually high rate of elevated TSH levels in patients with differentiated thyroid cancer treated with levothyroxine-specifically the brand Levothroid-becoming more obvious from September 1995. Faced with the possibility that these findings had some relationship to the drug taken, we carried out a prospective study, changing this brand of levothyroxine for another. DESIGN AND PATIENTS: We studied 58 patients with differentiated thyroid carcinoma (50 women and eight men; aged 22-75 years) who were being treated with levothyroxine and who had previously had adequate TSH suppression. Their Levothroid tablets were changed to the same dose of Dexnon tablets, and their clinical and analytical response was evaluated 2 months later. The patients were divided into two groups according to their TSH level at the start of the study: group 1, 42 patients with TSH > 0.2 mU/l (not suppressed) and group 2, 16 patients with TSH < or = 0.2 mU/l (suppressed). RESULTS: After 2 months with Dexnon the TSH levels in group 1 fell significantly (P < 0.0001) also decreasing in group (P < 0.09). The free T4 and free T3 rose significantly in both groups. After the change to Dexnon, 17 patients (40%) in group 1 had suppressed TSH and 26 (62%) had free T4 levels above the upper limit of normal vs none at baseline (P < 0.001). The group 2 patients maintained their inhibited TSH values after treatment with Dexnon, and the free T4 was above the upper limit of normal in 15 (94%) vs 3 (19%) at baseline (P < 0.001). The Levothroid tablets collected from the patients in both groups formed part of those which the manufacturer later withdraw from the market. These batches possessed the correct dosage, but they had been made from 'non-micronized' raw materials from another supplier. CONCLUSIONS: The most probable cause of the inadequate TSH suppression in our patients was the reduction in bioavailability in certain batches of Levothroid, although we are unable to rule out the possibility that the results obtained after the changeover to Dexnon were due to its greater bioavailability. Simple changes in the manufacture of levothyroxine tablets may produce important variations in their bioavailability, having an adverse effect on the clinical control of the patients, and causing extra expense by the need for repeated patient visits and thyroid function tests.
Subject(s)
Adenocarcinoma, Follicular/drug therapy , Carcinoma, Papillary/drug therapy , Thyroid Neoplasms/drug therapy , Thyroxine/chemistry , Thyroxine/pharmacokinetics , Adenocarcinoma, Follicular/blood , Adult , Aged , Biological Availability , Carcinoma, Papillary/blood , Chemistry, Pharmaceutical , Female , Humans , Male , Middle Aged , Thyroid Neoplasms/blood , Thyrotropin/blood , Thyroxine/blood , Treatment Failure , Triiodothyronine/bloodABSTRACT
The aim of the present study is to examine the influence which different concentrations of free fatty acids (FFAs) have on the insulin secretion response of the islets of Langerhans when the culture is prolonged over a week. Animals were killed by decapitation and pancreatic islets of Langerhans isolated. The islets were incubated in enriched RPMI and oleic or linoleic acid was added at concentrations of 0.04, 0.1, 0.375, and 1 mmol/l. The medium without FFAs was used as a control. The culture time was 7 days. For insulin secretion studies, islets were selected after preincubation in batches of six islets in 1 ml of KRB (Krebs-Ringer buffer) containing one of the following: 5.5, 11.1, 16 or 26.7 mmol/l glucose, 10 mumol/l forskolin or 20 mmol/l arginine. The results showed a significant increase in insulin secretion observed after culture with 1 mmol/l oleic and linoleic acid compared to the other concentrations and the control culture for all the secretagogues used. However, at this same concentrations no increase was observed in insulin secretion as the glucose concentration rose, and this was noticeable with linoleic acid at concentrations of 0.375 mmol/l. In conclusion, culture of islets of Langerhans for a week with high concentrations of unsaturated fatty acids produces a hypersecretion of insulin which is not influenced by secretagogues such as glucose, arginine, or forskolin. The loss of gluco-sensitivity may become greater as the degree of unsaturation of the fatty acid used increases.
Subject(s)
Fatty Acids, Unsaturated/pharmacology , Insulin/metabolism , Islets of Langerhans/drug effects , Islets of Langerhans/metabolism , Animals , Culture Techniques , Insulin Secretion , Linoleic Acid/pharmacology , Male , Oleic Acids/pharmacology , Rats , Rats, Wistar , Time FactorsABSTRACT
BACKGROUND: The nutritional state reportedly influences the age of menarche. In this work we investigated the potential relationship between the intake of various types of foods and the age of menarche, irrespective of body weight. METHODS: An overall 777 schoolgirls of ages between 8 and 16 years from Benalmádena (Málaga, Spain) were subjected to a cross-sectional study involving: the age of menarche as the dependent variable; and the weight, body mass index, skinfold thickness, food intake (estimated from weekly food frequency questionnaires), and age of menarche in the proband's mother and sisters as independent variables. Several models were developed in order to calculate the strength of association between the dependent variable (the presence or absence of menarche) and the independent variables. RESULTS: The average age of menarche was 12.4 years. The intake of the various types of foods was not consistent between the different age groups. In girls of 12 or younger, the age of menarche was found to be related to weight: Odds ratio (OR) = 7.06; (Confidence intervals (CI) = 2.80-17.6). On inclusion of various foods groups, the OR rose to 49.89 (CI = 40.85-60.84). In girls over 12, the age of menarche was essentially related to the intake of nuts and seeds (OR = 0.71, CI = 0.40-0.98). Inclusion of other foods groups decreased the OR (OR = 0.34, CI = 0.14-0.39). CONCLUSIONS: Significant statistical relationship between intake of nuts and seeds and the age of menarche was found.
