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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Body mass index and mortality in the elderly from general population
No full textOBJECTIVE:
To evaluate at a population level whether or not BMI is a risk factor of mortality in the elderly, highlighting possible gender-related differences.
METHODS:
3,282 Subjects aged 65-95 years, were recruited from an Italian general population and 12-year events were recorded. Blood tests and anthropometric measurements were performed. BMI as a continuous item was divided into quintiles and, for each quintile, adjusted hazard ratio (HR) with 95% confidence intervals for mortality was derived by classes of age and gender from Cox analysis.
RESULTS:
BMI inversely predicted overall and cancer mortality in men only. Overall mortality rate was 64.7% (HR = 1.63 [1.23-2.71]) in the 1st quintile of BMI, 54.9% (1.21 [0.92-1.73]) in the 2nd, 54.1% (1.20 [0.85-1.67]) in the 3rd, 53.3% (1.04 [0.82-1.32]) in the 4th and 52.5% in the 5th; cancer mortality rate was 23.1% (HR = 2.35 [1.31-4.23]), 14.2% (HR = 1.19 [0.65-1.80]), 15.8% (HR = 1.49 [0.93-2.39]), 15.8% (HR = 1.36 [0.84-2.16]) and 13.4%, respectively. The relationship between BMI and mortality remained significant only in men aged 76 years or less. No relationship was found between BMI and coronary or cerebrovascular mortality.
CONCLUSIONS:
BMI <22.7 kg/m2 does not improve survival in the elderly, while it is an independent predictor of cancer mortality in men aged <or=76 years. No prediction based on BMI is possible in women
Criteri di scelta del trattamento antiipertensivo in relazione alle caratteristiche genotipiche dell'iperteso
No full textTRIGLYCERIDES + HDL-CHOLESTEROL DISLIPIDAEMIA. A CORONARY RISK FACTOR IN ELDERLY WOMEN
No full textBACKGROUND: The relationship between serum triglycerides (TG) level and the risk of coronary heart disease (CHD) mortality remains controversial.
AIMS: To evaluate whether TG level is a risk factor for CHD in elderly people from general population, and to look for interactions between TG and other risk factors.
METHODS: 3257 subjects aged >or= 65 years followed up for 12 years from the CArdiovascular STudy in the ELderly. Blood tests and anthropometric measurements were performed. Continuous items were divided into quintiles and, for each quintile, adjusted hazard ratio (HR) with 95% confidence interval (CI) for CHD mortality was derived by genders from Cox analysis.
RESULTS: In women, the HR of being in the fifth rather than in the first quintile of TG was 2.45 (CI 1.48-3.51). In turn, high-density-lipoprotein cholesterol (HDL-C) inversely predicted CHD mortality; the HR of being in the first rather than in the fifth quintiles of HDL-C was 1.52 (CI 1.24-2.36). The risk of CHD mortality further increased up to 3.81 (CI 1.62-5.43) when high TG and low HDL-C were combined. No predictive role for either TG or HDL-C was detected in men.
CONCLUSIONS: TG and HDL-C were independent predictors of CHD mortality in elderly women. The combination high TG + low HDL-C quadrupled the risk of CHD mortality in this gender only
Triglycerides plus high-density-lipoprotein-cholesterol dyslipidaemia, a coronary risk factor in elderly women: the CArdiovascular STudy in the ELderly
No full textBACKGROUND:
The relationship between serum triglycerides (TG) level and the risk of coronary heart disease (CHD) mortality remains controversial.
AIMS:
To evaluate whether TG level is a risk factor for CHD in elderly people from general population, and to look for interactions between TG and other risk factors.
METHODS:
3257 subjects aged >or= 65 years followed up for 12 years from the CArdiovascular STudy in the ELderly. Blood tests and anthropometric measurements were performed. Continuous items were divided into quintiles and, for each quintile, adjusted hazard ratio (HR) with 95% confidence interval (CI) for CHD mortality was derived by genders from Cox analysis.
RESULTS:
In women, the HR of being in the fifth rather than in the first quintile of TG was 2.45 (CI 1.48-3.51). In turn, high-density-lipoprotein cholesterol (HDL-C) inversely predicted CHD mortality; the HR of being in the first rather than in the fifth quintiles of HDL-C was 1.52 (CI 1.24-2.36). The risk of CHD mortality further increased up to 3.81 (CI 1.62-5.43) when high TG and low HDL-C were combined. No predictive role for either TG or HDL-C was detected in men.
CONCLUSIONS:
TG and HDL-C were independent predictors of CHD mortality in elderly women. The combination high TG + low HDL-C quadrupled the risk of CHD mortality in this gender only
Tetanus-like syndrome secondary to metoclopramide administration.
No full textA case of metoclopramide-induced pseudotetanus in a 24-year-old woman is described. Symptoms included flexor spasms of the neck muscles, neck pain, left deviation of the lower jaw and tongue protrusion. Tetanus was initially suspected. Mydriasis, hyperhydrosis and clinical observation indicated that this syndrome could be caused by metoclopramide taken for gastrointestinal symptoms. Orphenadrine hydrochloride, diazepam and ketoprofen completely resolved the symptoms. Pseudotetanus presents in many different ways, and it is sometimes very hard to distinguish it from infective tetanus, which is very difficult to diagnose. Physicians using metoclopramide should be aware of its adverse effects and how to treat them
When hypertension is resistant...we think it over!
No full textA brief description of a very particular case of resistant arterial hypertensio
[The prognostic indices of cancer mortality in the elderly].
No full textArticolo sperimentale che esamina sistematicamente mediante analisi multivariata gli indici prognostici della mortalità neoplastica nell'anziano nell'ambito del CASTEL (CArdiovascular STudy in the ELderly)
Predictors of congestive heart failure mortality in elderly people from the general population - The CArdiovascular STudy in the ELderly (CASTEL)
No full textStroke occurs particularly frequently in elderly people and, being more often disabling than fatal, entails a high social burden. The predictors of stroke mortality have been identified in 3282 subjects aged > or = 65 years, taking part in the CArdiovascular STudy in the ELderly (CASTEL), a population-based study performed in Northeast Italy. Historical and clinical data, blood tests and 14-year fatal events were recorded. Continuous items were divided into quintiles and, for each quintile, adjusted relative risk (RR) with 95% confidence intervals [CI] was derived from multivariate Cox analysis. Age, historical stroke (RR: 5.2; 95% CI: 3.18-8.6) and coronary artery disease (RR: 1.38; CI: 1.18-2.1), atrial fibrillation (RR: 2.40; CI: 1.42-4.0), arterial hypertension (RR: 1.33; CI: 1.15-1.76), systolic blood pressure > or = 163 mmHg (RR: 1.84; CI: 1.20-2.59), pulse pressure > or = 74 mmHg (RR: 1.50; CI: 1.13-2.40), cigarette smoking (RR: 1.60; CI: 1.03-2.47), electrocardiographic left ventricular hypertrophy (RR: 1.72; CI: 1.10-2.61), impaired glucose tolerance (IGT, RR: 1.83; CI: 1.10-3.0), uric acid (UA) > 0.38 mmol/l (RR: 1.61; CI: 1.14-2.10), serum potassium > or = 5 mEq/l (RR: 1.70; CI: 1.24-2.50) and serum sodium < or = 139 mEql/l (RR: 1.34; 1.10-2.10) increased the risk of stroke. In the CASTEL, stroke was the first cardiovascular cause of death. Some independent predictors usually unrelated to stroke mortality (namely pulse pressure, pre-diabetic IGT, UA and blood electrolytes disorders) have been identified
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