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Top Tertile (top + tertile)
Selected AbstractsIncreased insulin resistance and risk of incident cerebrovascular events in patients with pre-existing atherothrombotic diseaseEUROPEAN JOURNAL OF NEUROLOGY, Issue 11 2009D. Tanne Background and purpose:, Diabetes and the metabolic syndrome are known risk factors for ischaemic stroke. Our aim was to examine whether amongst patients with pre-existing atherothrombotic disease, increased insulin resistance is associated with incident cerebrovascular events. Methods:, Patients with stable coronary heart disease included in a secondary prevention trial were followed up for a mean of 6.2 years. Coronary heart disease was documented by a history of myocardial infarction ,6 months and <5 years before enrollment and/or stable angina pectoris with evidence of ischaemia confirmed by ancillary diagnostic testing. Main exclusion criteria were insulin treated diabetes, hepatic or renal failure, and disabling stroke. Baseline insulin levels were measured in 2938 patients from stored frozen plasma samples and increased insulin resistance assessed using the homeostatic model assessment of insulin resistance (HOMA-IR), categorized into tertiles or quartiles. Results:, Crude rates of incident cerebrovascular events rose from 5.0% for HOMA-IR at the bottom tertile to 5.7% at the middle tertile, and 7.0% at the top tertile (P = 0.07). HOMA-IR at the top versus bottom tertile was associated with an unadjusted hazard ratio (HR) of 1.37 (95%CI, 0.94,1.98) and a 1-unit increase in the ln HOMA-IR was associated with a HR of 1.14 (95%CI, 0.97,1.35). In further analyses adjusting for potential confounders, or categorizing baseline HOMA-IR into quartiles, or excluding diabetic patients, we did not identify an increased risk for incident cerebrovascular events conferred by the top category. Conclusions:, Increased insulin resistance did not predict incident cerebrovascular events amongst patients with pre-existing atherothrombotic disease. [source] Clinical trial: low plasma cholesterol and oxidative stress predict rapid virological response to standard therapy with peginterferon and ribavirin in HCV patientsALIMENTARY PHARMACOLOGY & THERAPEUTICS, Issue 5 2009F. ANGELICO Summary Background, Rapid virological response (RVR) is the best predictor of sustained response to standard HCV treatment. Aim, To evaluate predictive factors of RVR. Methods, Sixty-five patients (mean age 52.6 ± 13.8; 37 genotype-1, and 28 genotypes-2/3) were consecutively treated with pegIFN-alpha2a or 2b once weekly plus daily ribavirin based on body weight for 24 or 48 weeks, according to genotype. RVR was defined as undetectable HCV-RNA at week 4. Results, Twenty-seven percent of patients achieved RVR in genotypes 1 and 60.7% in genotypes 2/3 (P < 0.01). Rapid responders had higher mean serum baseline total and LDL-cholesterol levels (P < 0.01). RVR was 20.0% in the bottom tertile of total cholesterol and 63.6% in the top tertile (P < 0.01). HCV-RNA levels at week 4 were positively correlated with baseline serum insulin (P < 0.01), HOMA-IR (P < 0.01), body mass index (P < 0.05) and number of components of metabolic syndrome (P < 0.01) and negatively correlated with cholesterol levels (P < 0.05). At multivariate analysis, age, LDL-cholesterol, HCV genotype and serum 8-iso-PGF2alpha, a marker of oxidative stress, were independent predictors of RVR. Conclusions, Our prospective study supports a role of low serum total and LDL-cholesterol and of oxidative stress as positive independent predictive factors of poor RVR in HCV patients. [source] Effect of selenium status and supplementation with high-selenium yeast on plasma homocysteine and B vitamin concentrations in the UK elderlyMOLECULAR NUTRITION & FOOD RESEARCH (FORMERLY NAHRUNG/FOOD), Issue 11 2008Bram Bekaert Abstract The level of plasma total homocysteine (tHcy), long known to be B vitamin dependent, has recently been shown to be inversely associated with plasma selenium (Se) concentration in human subjects. We therefore, chose to investigate the interaction between Se, tHcy and B vitamins in a double-blind, placebo-controlled trial where 501 healthy UK elderly volunteers were randomly allocated to receive 100, 200, or 300 ,g Se/day as high-Se-yeast, or placebo-yeast for 6 months. Plasma Se, tHcy, folate, vitamin B-12, pyridoxal-5,-phosphate (PLP) and its catabolite, 4-pyridoxic acid, were measured in all participants at baseline and in samples from the placebo, 100 and 300 ,g Se/day groups, at follow-up. At baseline, Se was inversely correlated with tHcy but only in males (p < 0.001). Before supplementation, tHcy concentration was significantly lower in the highest compared to the lowest Se tertile in males (p < 0.05), and in females when folate concentrations were also in the top tertile (p < 0.05). The effect of folate, PLP and vitamin B-12 concentrations on plasma tHcy correlated with Se concentration at baseline. After 6 months of Se supplementation, only Se concentration had changed significantly. Supplementation with Se does not affect tHcy concentration in the UK elderly population. [source] National Study of the Relation of Primary Care Shortages to Emergency Department UtilizationACADEMIC EMERGENCY MEDICINE, Issue 3 2007Ilana B. Richman BA Background: Emergency department (ED) visit volumes are increasing nationwide. Objectives: To determine whether states with primary care shortages have higher rates of ED use. Methods: Populations residing in primary care shortage areas were abstracted from the Health Resources and Services Administration Geospatial Database. Annual ED visit volumes were available from the 2001 National ED Inventory. Population data and potential confounders were abstracted from federal data sets. All analyses were conducted at the state level. Results: Primary care shortage densities varied greatly across states, ranging from 3 (New Jersey) to 28 (Mississippi) medically underserved individuals per 100 people. States also varied in their annual ED visit densities, ranging from 23 visits (Hawaii) to 65 visits (Washington, DC) per 100 people. Of the 17 states in the top tertile for primary care shortage, 7 also were in the top tertile for ED visits. Primary care shortage density was positively associated with ED visit density. An increase of 10 medically underserved individuals per 100 people was associated with an annual increase of 4.2 ED visits per 100 people (p = 0.04). The association remained after controlling for six factors, with an increase of 10 medically underserved individuals per 100 people associated with an annual increase of 3.3 ED visits per 100 people (p = 0.04). Nevertheless, five states had high ED visit densities despite comparatively low primary care shortage densities (Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont), whereas five others had low ED visit densities despite high primary care shortage densities (Arizona, Idaho, Montana, New Mexico, and South Dakota). Conclusions: A positive association between primary care shortage densities and ED visit densities was found. Although most states adhere to this pattern, some states do not. Further investigation of this dissociation may yield additional explanations for rising ED visit volumes. [source] Use of over-the-counter medicines in childrenINTERNATIONAL JOURNAL OF PHARMACY PRACTICE, Issue 4 2003John McIntyre senior lecturer in child health ABSTRACT Objective To assess the reasons for over-the-counter (OTC) medicine use in children and the sociodemographic factors influencing this choice of self-care rather than GP consultation. Method Questionnaires were sent to the home address of a randomly generated list of children under 12 years of age from three GP practices in the East Midlands selected to represent bottom, middle and top tertiles of deprivation on the basis of the Jarman score. Analysis using chi-square and Mann-Whitney tests was used to identify associated factors (number of carers in the home, number of children, deprivation score, parent/carer's age, age and number of children in the house) of the responses. Setting Primary care setting in the East Midlands region of England. Key findings From 424 completed questionnaires returned (response rate 61%), 413 parents/carers had purchased OTC medicines. Fifty-one different products had been purchased, with analgesic/antipyretic and cough/cold remedies the most frequently bought. The most commonly reported reasons for parent/carer initiated medication were to avoid troubling the GP with minor childhood ailments (79% of respondents) and to have medicines available in case of future need (74%). Cost was a barrier to buying OTC medicines for the more deprived. Advice-seeking behaviour was associated with the symptom, the number of children, affluence and the age of the child. Conclusion Parent/carer initiated use of OTC medication is widespread, particularly for analgesic/antipyretic and cough/cold remedies. Differences in advice-seeking behaviour are associated with the presenting symptom and a variety of sociodemographic factors. [source] Abdominal Aortic Calcification Detected on Lateral Spine Images From a Bone Densitometer Predicts Incident Myocardial Infarction or Stroke in Older WomenJOURNAL OF BONE AND MINERAL RESEARCH, Issue 3 2008John T Schousboe MD Abstract Among a cohort of elderly women, abdominal aortic calcification scored on baseline lateral spine densitometric images intended for vertebral fracture assessment was associated with subsequent myocardial infarction or stroke over a median 4-yr period, independent of clinical cardiovascular disease risk factors. Introduction: Cardiovascular disease (CVD) risk among older women is not adequately captured by traditional CVD risk factors. Lateral spine images obtained on bone densitometers for vertebral fracture assessment (VFA) can detect abdominal aortic calcification (AAC), an important marker of subclinical CVD. Our objective was to estimate the association between AAC scored on VFA images and subsequent myocardial infarction (MI) or stroke in elderly women. Materials and Methods: Among participants in a randomized controlled trial (women; age >75 yr) of clodronate versus placebo, those who sustained an MI or stroke during the median 4-yr follow-up study period were selected as cases (n = 408), and 408 controls were randomly selected from the remainder of the parent study population. Baseline VFA images were scored for AAC with a previously validated 24-point scale and a newer, simpler 8-point scale. Results: The OR of incident MI or stroke for those in the middle and top tertiles, respectively, compared with the bottom tertile of AAC score were 1.14 (95% CI, 0.79,1.66) and 1.74 (95% CI, 1.19,2.56) for the 24-point scale and 1.42 (95% CI, 0.98,2.05) and 1.77 (95% CI, 1.22,2.55) for the 8-point scale, adjusted for age, high-density lipoprotein and low-density lipoprotein cholesterol, triglycerides, blood pressure, smoking, renal function, health status, and baseline diagnoses of diabetes mellitus, hypertension, angina, and prior stroke. Conclusions: AAC scored on VFA images is independently associated with incident MI or stroke. Because bone densitometry is indicated for all women ,65 yr of age, VFA imaging offers an opportunity to capture this CVD risk factor in postmenopausal women undergoing bone densitometry at very little additional cost. [source] | ||||||||||