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PubMed1996

Iron and heart disease: the epidemiologic data.

There has developed a general theory of chronic and degenerative disease causation--the Oxidative Stress Theory. This theory states that the production of tissue-damaging free radicals is an essential component in the pathogenesis of chronic diseases and that iron may help to catalyze the reactions producing free radicals. As a result, it has been suggested that the risk of coronary heart disease increases with increasing body iron stores. In support of that hypothesis, a prospective epidemiologic study of heart disease in Finnish men found that the risk of heart attack increased with increasing levels of serum ferritin. However, the vast majority of the epidemiologic data, including results from prospective, cross-sectional, and case-control and autopsy studies, published since that initial study have failed to support the original hypothesis that high body iron stores increase the risk of coronary heart disease.

Adult↗

PubMed2002

[Adenocarcinomas of the ethmoid sinuses. Epidemiological data].

OBJECTIVE: The relationship between adenocarcinomas of the ethmoid (ADKE) and wood-dust exposure has been well established. Sino-nasal cancer in wood-workers has been added to the list of occupational disorders in France, as prescribed disease number 47-Bq. PATIENTS AND METHODS: Our data set consisted of 207 cases with sino-nasal cancer (from January 1985 to January 2001). Among these cases, 67.1% were adenocarcinoma. A wood dust exposure has been reported in 96.4% cases. The mean duration of wood dust exposure was 30 years. The mean latency between the end of the exposure and the diagnostic was 10.6 years. RESULTS: Our epidemiological data confirmed those from the biomedical literature. The occupations at greatest risk are furniture workers, sawmill workers, carpentry workers, and other wood product workers. Two components of exposure - duration and average level - contributed independently to the overall elevated risk. The risk is greater among men who were employed in jobs with the highest wood dust exposure and increases with the duration of exposure. CONCLUSIONS: The preinvasive stages of ADKE (mucostasis/cuboïd metaplasia/dysplasia) are still an unverified hypothesis. ADKE were observed in workers who use "hard" woods. The chemical nature of the carcinogenic factor(s) in wood dust is not known. The factors responsible for induction of ADKE in hard wood-workers probably exist in the wood-dust itself. Tannins were suggested as possible contributing agents to induction of ADKE. In addition to wood dust, exposures may include formaldehyde. Given these facts, it should be possible to define preventive measures, so that incidence of ADKE in professional wood and leather workers should decrease.

Adenocarcinoma↗

PubMedDate not supplied

[Metabolic syndrome: definitions and epidemiological data].

The metabolic syndrome is strongly related to visceral obesity and associated with a high risk of cardiovascular morbidity and mortality. Since the original description of Reaven in 1988, several working definitions have been proposed, especially by the World Health Organisation in 1998-99, the National Cholesterol Education Program (NCEP-ATP III) Expert Panel in the United States in 2001 and the European Group for the Study of Insulin Resistance (EGIR) in 2002. The present paper attempts at comparing these various definitions and at reporting epidemiological data both in North America and in Europe, especially in Belgium. The prevalence is generally higher in men than in women and strongly increases with age. Overall, one may estimate that around 20% of adults have a metabolic syndrome, which should therefore be considered as an important public health problem.

Albuminuria↗

PubMed1998

An evaluation of the collection and analysis of epidemiological data for support of food safety control systems.

Food-borne disease data collected by three U. K. environmental health departments were used in this study. The data were analyzed using a database designed to rank disease agents, food ingredients, and processing factors which contribute to cases of food-borne disease. The results established changes in patterns of food-borne disease over time, pattern differences between U. K. localities and differences between areas of the United Kingdom and the United States. This type of analysis of epidemiological data provides scientific underpinning for hazard analysis critical control point systems for food safety control. The work highlights the need for a consistent procedure for collection of food-borne disease data and for a national database to facilitate analysis.

Data Collection↗

PubMed2002

[Chronic arthroses in children: practical approach and epidemiological data].

Osteo-articular symptoms are frequent in pediatrics, but chronic arthritis is rare in childhood. Arthritis may be difficult to recognize in children and there is a large differential diagnosis including infectious and neoplastic diseases. Even if juvenile arthritis has often a favourable course, significant functional damage may occur. The diagnosis and the follow-up of chronic arthritis should be performed in collaboration with a specialized consultation in pediatric rheumatology, in order to allow access to multidisciplinary medical care and help to increase the clinical and epidemiological knowledge in these rare diseases. A study is starting this fall aimed at collecting epidemiological datas on childhood arthritis in the french part of Switzerland.

Algorithms↗

PubMed1999

Ethylene oxide cancer risk assessment based on epidemiological data: application of revised regulatory guidelines.

Ethylene oxide (EO) research has significantly increased since the 1980s, when regulatory risk assessments were last completed on the basis of the animal cancer chronic bioassays. In tandem with the new scientific understanding, there have been evolutionary changes in regulatory risk assessment guidelines, that encourage flexibility and greater use of scientific information. The results of an updated meta-analysis of the findings from 10 unique EO study cohorts from five countries, including nearly 33,000 workers, and over 800 cancers are presented, indicating that EO does not cause increased risk of cancers overall or of brain, stomach or pancreatic cancers. The findings for leukemia and non-Hodgkin's lymphoma (NHL) are inconclusive. Two studies with the requisite attributes of size, individual exposure estimates and follow up are the basis for dose-response modeling and added lifetime risk predictions under environmental and occupational exposure scenarios and a variety of plausible alternative assumptions. A point of departure analysis, with various margins of exposure, is also illustrated using human data. The two datasets produce remarkably similar leukemia added risk predictions, orders of magnitude lower than prior animal-based predictions under conservative, default assumptions, with risks on the order of 1 x 10(-6) or lower for exposures in the low ppb range. Inconsistent results for "lymphoid" tumors, a non-standard grouping using histologic information from death certificates, are discussed. This assessment demonstrates the applicability of the current risk assessment paradigm to epidemiological data.

Animals↗

PubMed2005

["Wise be aware of your sayings"--about gaps between epidemiological data base, experimental results and decision making in health administration].

When scientific researches are being published one should consider carefully the different possible influences which may change the results. These influences may be of two kinds: Non-Causal explanations, and Casual explanations. Researchers may arrive at their results and not have considered all the causative explanations. Occams's Razor is the basic rule by which most reasonable explanations are chosen. A statistical result and an appropriate simple theory to explain it, is not sufficient to prove causative effect. In many cases though, the media and public tend to accept a statistically significant result as if it was a proven cause and effect relation. There are several conditional demands called Bradford Hill criteria of which epidemiological data and results are only one, the more results arrived by using the Bradford Hill criteria, the better chances exist that the examined variable is the cause for the effect. Finally, there is a gap between a proven causal factor for disease or the harmful effects of treatment and a "clear cut" health policy. There are several intermediate powerful influences which are involved in the process of stating a new health policy. These influences include among others, the involvement of decision makers, political influences and civil service professionals. As an example three different issues of a well proven clinical research will be presented. The research of Rofecoxib = "Vioxx" cardiac effects, the research of Hormonal Replacement Treatment health effects on post menopausal women and the last of Health risks presented by mobile phone use. Although the results of those researches were proven to be statistically significant, Health Policy in each case is different and less clear. Health Policy is not based solely on figures and statistical results, but rather on a far wider and more complex influences and judgment.

Anti-Inflammatory Agents, Non-Steroidal↗

PubMedDate not supplied

[Psychotropic drugs induced weight gain: a review of the literature concerning epidemiological data, mechanisms and management].

Weight gain is associated with the use of many psychotropic medications, including antidepressants, mood stabilizers, antipsychotic drugs, and may have serious long term consequences: it can increase health risks, specifically from overweight (BMI = 25-29.9 kg/m2) to obesity (BMI > or =30 kg/m2), according to Body Mass Index (BMI), and the morbidity associated therewith in a substantial part of patients (hypertension, coronary heart desease, ischemic stroke, impaired glucose tolerance, diabetes mellitus, dyslipidemia, respiratory problems, osteoarthritis, cancer); according to patients, psychosocial consequences such as a sense of demoralization, physical discomfort and being the target of substantial social stigma are so intolerable that they may discontinue the treatment even if it is effective. The paper reviews actual epidemiological data concerning drug induced weight gain and associated health problems in psychiatric patients : there is a high risk of overweight, obesity, impaired glucose tolerance, diabetes mellitus, premature death, in patients with schizophrenia or bipolar disorder; and the effects of specific drugs on body weight: Tricyclic Antidepressants (TCA) induced weight gain correlated positively with dosage and duration of treatment, more pronounced with amitriptyline ; Selective Serotonin Reuptake Inhibitors (SSRI) decrease transiently bodyweight during the first few weeks of treatment and may then increase bodyweight; weight gain appears to be most prominent with some mood stabilizers (lithium, valproate); atypical antipsychotics tend to cause more weight gain than conventional ones and weight gain, diabetes, dyslipidemia, seem to be most severe with clozapine and olanzapine. Conceming the underlying mechanisms of drug induced weight gain, medications might interfere with central nervous functions regulating energy balance; patients report about: increase of appetite for sweet and fatty foods or "food craving" (antidepressants, mood stabilizers, antipsychotic drugs) and weight gain despite reduced appetite which can be explained by an altered resting metabolic rate (TCA, SSRI, Monoaminoxidase Inhibitors MAO I). According to current concepts, appetite and feeding are regulated by a complex of neurotransmitters, neuromodulators, cytokines and hormones interacting with the hypothalamus, including the leptin and the tumor necrosis factor system. The pharmacologic mechanisms underlying weight gain are presently poorly understood: maybe the different activities at some receptor systems may induce it, but also genetic predisposition. Understanding of the metabolic consequences of psychotropic drugs (weight gain, diabetes, dyslipidemia) is essential: the insulin-like effect of lithium is known; treatment with antipsychotic medications increases the risk of impaired glucose tolerance and diabetes mellitus. Several management options of weight gain are available from choosing or switching to another drug, dietary advices, increasing physical activities, behavioural treatment, but the best approach seems to attempt to prevent the weight gain : patients beginning maintenance therapy should be informed of that risk, and nutritional assessment and counselling should be a routine part of treatment management, associated with monitoring of weight, BMI, blood pressure, biological parameters (baseline and three months monitoring of fasting glucose level, fasting cholesterol and triglyceride levels, glycosylated haemoglobin). Psychiatrics must pay attention to concomitant medications and individual factors underlying overweight and obesity. Weight gain has been described since the discovery and the use of the firstpsychotropic drugs, but seems to intensify with especially some of the second generation antipsychotic medications ; understanding of the side effects of psychotropic drugs, including their metabolic consequences (weight gain, diabetes, dyslipidemia) is essential for the psychiatrics to avoid on the one hand a risk of lack of compliance, a discontinuation of the pharmacological medication and also a risk of relapse and rehospitalization, and on the other hand to avoid acute life threatening events (diabetic ketoacidocetosis and non ketotic hyperosmolar coma, long term risk complications of diabetes and overweight).

Body Mass Index↗

PubMed2002

[Epidemiological data on the plague in Madagascar].

The first case of plague was introduced in Madagascar in 1898 in the east coast by way of boat from India. In 1921, plague reach the highlands and a large epidemic over the next twenty years. Until the beginning of the 80's, only of few case were identified, notified mostly in rural setting. However gradually it has re-emerged as a public health problem. Urban plague is located in the city of Antananarivo (resurgence in 1978 after 28 years of apparent silence) and in Mahajanga port (resurgence in 1991 after 63 years of silence). The reactivation of the Plague National Control Program from 1994 will allow better surveillance. The aim of this analysis is to update the epidemiological data on human plague in Madagascar based on reported cases obtained from the Central Lab of the Pasteur Institute of Madagascar from 1980 to 2001 (16,928 suspected cases of which 3,500 are likely positives or confirmed positives). The Plague season runs from October to March on the central highlands and July to November on the north-western coast. Sex-ratio male/female is 1.3/1, and the age-group of 5 to 25 years is more affected. The case fatality rate was 40% in the beginning of the 1980's, and decreased to 20% by the end of the 1990's. The percentage of case with pulmonary plague decrease from 15% to less than 5%. However, geographical extension is demonstrated: 4 districts in 1980, 30 districts in 1999 and 21 districts in 2001. In 2002, the diffusion of a new rapid test (reagent strip) in the primary health centres (CSB) in 42 endemic districts may help to decrease the morbidity and the letality due to plague and improve its control at the national level.

Adolescent↗

PubMed2001

[Epidemiological data on chronic bronchitis in France].

DEFINITIONS: Cough and expectorations present for at least 3 months every year for at least 2 consecutive years are the characteristic feature of chronic bronchitis. Pulmonary emphysema is a permanent distension of the air spaces beyond the bronchioles with destruction of the alveolar walls. Chronic obstructive pulmonary disease (COPD), which often develops after chronic bronchitis, is defined as an obstructive ventilatory syndrome demonstrated by a forced expiratory volume in 1 second/vital capacity (FEV1/VC) ratio below 70%. Acute exacerbation of chronic bronchitis is characterized by worsening cough, expectoration and/or dyspnea. RISK FACTORS: Active smoking is a predominant risk factor for COPD; the decrease in FEV1 is tightly correlated with individual sensitivity to tobacco smoke. Other risk factors have been identified: occupational exposure to airborne contaminants, alpha-anti-tripsin deficiency. EPIDEMIOLOGICAL DATA: A recent survey showed that the prevalence of chronic bronchitis in the adult population in France aged over 25 years is an estimated 1.2 to 2 million people without co-morbidity and an estimated 1.6 to 2.8 million including people with co-morbidity (for instance asthma). The annual death toll reaches 10,000 to 12,000. MANAGEMENT: In patients without co-morbidity, only about 30% of all cases of chronic bronchitis are diagnosed. Medical care is given to about 15%. The impact of acute exacerbations (average 3 episodes per year according to the survey), both in number and in terms of quality of life, would be underestimated.

Acute Disease↗

PubMed1978

Epidemiologic data for environmental determination of urinary system tumours and nephropathy in an endemic region.

One hundred and thirty-eight patients diagnosed for urinary system tumours (UST), 714 patients with endemic nephropathy (EN) and 55 cases of UST and EN combined, all from endemic villages of Vratza district, Bulgaria were investigated for their familial pattern and time of diagnosis compared with the age at diagnosis. There were 144 spouses among these patients and nearly half of them came from non-endemic families and villages. The familial pattern followed the size of the population found to be at greater risk, i.e. people 40-60 years old, in particular women. Among the investigated 91 pairs of parents and children and 166 pairs of siblings the mean diagnostic interval was shorter than the mean difference of age at diagnosis. Therefore the epidemiologic data provide support to the hypothesis that possibly environment plays a predominant role in the familial aggregation and in the etiology of UST and EN in the endemic region.

Adult↗

PubMed2000

Congenital pseudarthrosis of the tibia: history, etiology, classification, and epidemiologic data.

Congenital pseudarthrosis of the tibia is a rare disease with a variable history. The pseudarthrosis is usually not present at birth (and therefore is not truly congenital) but occurs during the first decade of life. Paget in 1891 was the first to describe a case. The etiology is unknown. Neurofibromatosis plays a role in approximately 50% of patients. In the others, hereditary and mechanical factors are debated. Various (morphologic) classification systems have been proposed (Andersen, Boyd, Crawford). Because the appearance changes during the course of the disease, all classification systems have limited value: the determining factor is the stage of the disease at which it was classified. Because of the rarity of the disease and the variability of its history, the European Pediatric Orthopaedic Society decided to carry out a multicenter study on this disease. This paper presents the epidemiologic data on the patients involved. Data have been gathered on 340 patients from 13 countries. Two hundred patients were male (58.8%), 140 were female (41.2%). The right side was affected in 165 patients (48.5%) and the left side in 172 (50.6%); 3 patients had bilateral disease. Symptoms of neurofibromatosis were present in 54.7%. Histologic examinations in 192 patients showed a nonspecific appearance in 45.3%; in 15.6% the ultrastructure resembled fibrous dysplasia, and in 39% there was histologic evidence of neurofibromatosis. Most of the lesions were initially localized in the middle or distal third of the tibia. In 29% the localization changed during the course of the disease.

Child↗

PubMed1994

Mechanisms of brain injury related to mathematical modelling and epidemiological data.

Measurements of the frequency response of head impact points on the exterior and the interior of a car were used to characterize the dynamic behavior of the object that was struck. These points were then arranged in a hierarchy of increasing stiffness. Thirty-two cases in which the distribution of injury to the brain had been recorded were grouped according to the stiffness of the object struck and by the location of the impact on the head. The distribution of the brain lesions were determined for each class of stiffness and location of impact. Three probable mechanisms of brain injury were distinguished: relative motion between the brain and the skull, local bone deformation, and intracerebral stresses. Each mechanism was related to a range of stiffness and natural frequency of the structure impacted. These theories of brain injury mechanisms are consistent with observed epidemiological data and with conclusions drawn from mathematical modelling.

Accidents, Traffic↗

PubMed1998

Will new diagnostic criteria for diabetes mellitus change phenotype of patients with diabetes? Reanalysis of European epidemiological data. DECODE Study Group on behalf of the European Diabetes Epidemiology Study Group.

OBJECTIVE: To evaluate the impact of the revised diagnostic criteria for diabetes mellitus adopted by the American Diabetes Association on prevalence of diabetes and on classification of patients. For epidemiological purposes the American criteria use a fasting plasma glucose concentration >=7.0 mmol/l in contrast with the current World Health Organisation criteria of 2 hour glucose concentration >=11.1 mmol/l. DESIGN: Data were collected from 13 populations and three occupational based studies from eight European countries. All studies used a 75 g oral glucose tolerance test to measure fasting and 2 hour glucose concentrations. SUBJECTS: 17 881 men; 8309 women; age range 17-92 years. MAIN OUTCOME MEASURES: Classification of diabetes according to both sets of criteria. RESULTS: The application of the American criteria on European populations induced changes in prevalence of diabetes ranging from a reduction of 4.0% to an increase of 13.2%. A total of 1517 previously undiagnosed individuals had diabetes according to either the WHO or the American criteria. Among 1044 with diabetes according to American criteria, only 45% had 2 hour values fulfilling the WHO criteria. The risk of disagreement of classification decreased with increasing body mass index (P<0.00001) and increasing age (P<0.0001); the impact of sex was not significant (P=0.08). CONCLUSIONS: This shift in strategy from using 2 hour to fasting plasma glucose will cause an increase in the prevalence of diabetes in some European populations. A high degree of disagreement in the classification was observed between the two recommendations. Prospective data are needed to evaluate whether the WHO or the American criteria best identify individuals at risk of developing microvascular complications and cardiovascular disease. Wider implementation of revised diagnostic criteria should await prospective data.

Adult↗

PubMed1994

Molecular epidemiology of HIV-1 in the former Soviet Union: analysis of env V3 sequences and their correlation with epidemiologic data.

OBJECTIVE: To investigate the HIV-1 V3 sequence diversity in the former Soviet Union in 30 subjects infected with HIV-1 via different modes of transmission. PATIENTS: A cohort of children infected after exposure to nonsterile needles during the epidemic in 1988-1989 in southern Russia (Elista, n = 12 and Rostov-on-Don, n = 10), and eight HIV-seropositive subjects from Belarus (Minsk), infected via sexual (n = 7) and parenteral (n = 1) infection. METHODS: The HIV-1 V3 encoding region was amplified by nested polymerase chain reaction on DNA of primary peripheral blood mononuclear cells collected from the study subjects and then cloned and sequenced. RESULTS: The alignment of 127 V3 sequences from 22 patients in the cohort group demonstrated common consensus sequences in both the Elista and Rostov samples. The average means of interperson variation were 5.9 and 6.6% in Elista and Rostov subjects, respectively, and comparable to the mean intraperson variation. The average mean interperson variation between nucleotide sequences of HIV patients infected through sexual transmission was considerably higher (14.9%). CONCLUSION: V3 sequence analysis confirms the epidemiologic data which support the transmission of HIV-1 in children from a single source, and suggests the infection of a mother from her parenterally infected child. Furthermore, the genetic variability of HIV-1 V3 in the noncohort group was particularly divergent indicating the heterogeneity of the virus circulating in the former Soviet Union.

Adolescent↗

PubMed1992

Problems in the interpretation of small area analysis of epidemiological data: the case of cancer incidence in the West of Scotland.

STUDY OBJECTIVE: The aim was to examine the extent to which random variation alone will produce differences in observed incidence rates between small areas which will affect measures of spatial clustering and estimates of relative risk. DESIGN: This was a study of changes in the pattern of spatial concentration of cancer incidence over a five year time period. A comparison was made of observed incidence rates for 34 tumour sites with randomly generated values and, where possible, with expected values derived from known relative risks. SETTING: Twenty six local government districts in the West of Scotland. MAIN RESULTS: A statistically significant relationship was observed between sample size and the stability of a summary measure of spatial concentration. Almost all observed highest:mean rate ratios were within the 95% confidence interval of the simulated distribution of these values. In three cases examined, both observed and simulated highest:lowest rate ratios were larger than those expected on the basis of known exposures to risk. CONCLUSIONS: In the absence of a prior hypothesis, small area analysis of epidemiological data for periods of less than 10 years will almost always give misleading results for all but the most common diseases.

Analysis of Variance↗

PubMed2000

[Laryngeal tuberculosis: considerations on the most recent clinical and epidemiological data and presentation of a case report].

According to the "Global Tuberculosis Control" performed in 1999--the third complete, international, global report on tuberculosis infection--173 countries reported their infection data to the WHO; of these countries 102 met the criteria for "DOTS programs" at the end of 1997. The DOTS programs are the only control strategy able to produce a cure rate of 85%. Both at the national and international (Centers of Disease Control) levels, guidelines have been drawn up to improve and coordinate the fight against tuberculosis. New indicators and methods of analysis should be developed to quantify the full impact on the control of infection transmission, incidence, prevalence, mortality and prevention of drug resistance. In addition, two significant world-wide events have affected the increase morbidity rate seen in the last decade in the more highly industrial countries: immigration from countries outside the European Community and HIV infection. The tuberculosis infection worsens the evolution of HIV, facilitating viral replication. In the present work the authors discuss the most recent epidemiological data regarding tuberculosis infection and review the Literature on the primary laryngeal location of the disease. Then they present a clinical case which recently came under observation. This case is a typical example of the clinical picture of the laryngeal tuberculosis seen today. It must not be forgotten that in recent years there has been an increase in morbidity in Italy, in both the pulmonary and extrapulmonary forms of the disease, although in our country the problem of delayed or incomplete reporting is quite widespread. The data show that the age ranges with the highest incidence of both pulmonary and extrapulmonary forms are the 25-35 and 60-70 year groups. Distribution by sex, on the hand, shows that the pulmonary forms are most often seen in males while the extrapulmonary forms have practical the same frequency in both sexes. In recent years the clinical and morphological aspects of tubercular laryngitis have changed significantly from what they were before chemotherapy and the most common clinical form is pseudotumoral tuberculosis. This form requires a differential diagnosis to distinguish it from neoplasms because they present a similar objective picture and have no signs of simultaneous or previous pulmonary involvement.

Diagnosis, Differential↗

PubMed2004

[Major and minor amputation rates and lower critical limb ischemia: the epidemiological data of western Tuscany].

BACKGROUND: The aim of this study was to evaluate the incidence of major amputations and critical limb ischemia in an unselected population of western Tuscany. METHODS: Out of an overall 1234000 people living in Pisa and surroundings (western Tuscany), a total amount of 306 patients underwent 319 different major/minor amputations during the year 2002 in private and public hospitals, both in Tuscany and in other regions. RESULTS: 84.6% (n = 270) of the amputations were atherosclerotic, while 15.4% (n = 49) were non-atherosclerotic. The patients with unreconstructable critical limb ischemia, who underwent amputations at the symptomatic limbs, had a minor amputation rate (at toes or forefoot) of 46.7%, while the major amputation rate (over the ankle) was 53.3%. The 144 major amputations were performed in 76.4% (n = 110) of the cases above the knee and in the remaining 23.6% (n = 34) of cases below the knee. Early hospital mortality rates of the amputees for ischemic causes were 7.6% in patients who underwent major amputations, and 0.8% in cases with minor amputations, respectively. Overall, in western Tuscany, the incidence of the major amputation rate per million inhabitants was 117 cases per year, with a total of 468 new cases of reconstructable and unreconstructable critical limb ischemia per year (this number was calculated multiplying by 4 the number of major amputations). CONCLUSIONS: On the basis of our real epidemiological data, the theoretical major amputation rates per year were 408 in Tuscany and 6652 in Italy, respectively. The extrapolation of our results showed that the overall critical limb ischemia incidence consists of 1638 cases in Tuscany and of 26676 patients in Italy, respectively.

Adolescent↗