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Sökning: WFRF:(Dahlén Johan) > (2010-2014)

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2.
  • Dahlén, Elsa M, et al. (författare)
  • Abdominal Obesity and low grade Systemic Inflammation as Markers for Subclinical Organ Damage in type 2 diabetes
  • 2014
  • Ingår i: Diabetes & Metabolism. - : Elsevier. - 1262-3636 .- 1878-1780. ; 40:1, s. 76-81
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to explore associations between abdominal obesity, inflammatory markers, and subclinical organ damage in 740 patients with type 2 diabetes. Waist circumference (WC) and sagittal abdominal diameter (SAD) was measured. Blood samples were analyzed for; C-reactive protein (CRP), interleukin (IL) -1β and IL-6. Carotid intimamedia thickness (IMT) was evaluated by ultrasonography. Aortic pulse wave velocity (PWV) was measured with applanation tonometry.Abdominal obesity were significantly correlated with; IL-6, CRP (both p= <0.001, WC and SAD, respectively), IMT (WC p=0.012, SAD p=0.003) and PWV (p<0.001, for WC and SAD, respectively). In multiple linear regressions with IMT as dependent variable and age, sex, statins, systolic blood pressure (SBP), Body Mass Index (BMI), CRP and HbA1c, as independent variables, SAD (p=0.047) but not WC, remained associated with IMT. In stepwise linear regression, entering both SAD and WC, the association between SAD and PWV was stronger than the association between WC and PWV.We conclude that SAD and WC are feasible measures of obesity that provides information on inflammation, atherosclerosis and arterial stiffness in type 2 diabetes. However, SAD was slightly more robustly associated to subclinical organ damage, compared with WC.
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  • Dahlén, Elsa M, et al. (författare)
  • Is there an underestimation of intima-media thickness based on M-mode ultrasound technique in the abdominal aorta?
  • 2012
  • Ingår i: Clinical Physiology and Functional Imaging. - : Wiley-Blackwell. - 1475-0961 .- 1475-097X. ; 32:1, s. 1-4
  • Tidskriftsartikel (refereegranskat)abstract
    • Measuring intima-media thickness (IMT) in the common carotid artery (CCA) is a valuable resource for the evaluation of subclinical atherosclerosis. The main objective of this study was to explore whether a B-mode ultrasound technique, Philips ATL, and an M-mode ultrasound technique, Wall Track System (WTS), show interchangeable results when measured in CCA and the abdominal aorta (AA). A total of 24 healthy, young subjects were examined. IMT and lumen diameter (LD) of the AA and the CCA were measured twice by two skilled ultrasonographers with two different ultrasound equipment B-mode: (Philips, ATL and M-mode: WTS).The intra-observer variability of IMT in CCA and AA using B-mode showed a coefficient of variation 8% and 9%, and with M-mode 11% and 15%, respectively. Interobserver variability of IMT in CCA and AA using B-mode was 6% and 12%, and with M-mode 11% and 18%, respectively. CCA IMT was 0·53 ± 0·07 and 0·53 ± 0·09 mm using B-mode and M-mode, respectively. However, in AA, IMT was 0·61 ± 0·5 and 0·54 ± 0·10 mm using B-mode and M-mode, respectively. Thus, AA IMT was 11·5% thicker using B-mode (P<0·01). We received adequate IMT readings from the carotid artery as well as the AA using two commonly used B-mode and M-mode techniques. B-mode technique seems to show less variability, especially in the AA. More importantly, the two techniques measured different IMT thickness in the aorta, emphasizing the importance of using similar technique when comparing the impact of absolute values of IMT on cardiovascular disease.
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4.
  • Dahlén, Elsa M, et al. (författare)
  • Sagittal abdominal diameter is a more independent measure compared with waist circumference to predict arterial stiffness in subjects with type 2 diabetes - a prospective observational cohort study
  • 2013
  • Ingår i: Cardiovascular Diabetology. - : BioMed Central. - 1475-2840. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • BackgroundAnthropometric measurements are useful in clinical practice since they are non-invasive and cheap. Previous studies suggest that sagittal abdominal diameter (SAD) may be a better measure of visceral fat depots. The aim of this study was to prospectively explore and compare how laboratory and anthropometric risk markers predicted subclinical organ damage in 255 patients, with type 2 diabetes, after four years.MethodsBaseline investigations were performed in 2006 and were repeated at follow-up in 2010. Carotid intima-media thickness (IMT) was evaluated by ultrasonography and aortic pulse wave velocity (PWV) was measured with applanation tonometry over the carotid and femoral arteries at baseline and at follow-up in a cohort of subjects with type 2 diabetes aged 55–65 years old.ResultsThere were significant correlations between apolipoprotein B (apoB) (r = 0.144, p = 0.03), C - reactive protein (CRP) (r = 0.172, p = 0.009) at baseline and IMT measured at follow-up. After adjustment for sex, age, treatment with statins and Hba1c, the associations remained statistically significant. HbA1c, total cholesterol or LDL-cholesterol did not correlate to IMT at follow-up. Baseline body mass index (BMI) (r = 0.130, p = 0.049), waist circumference (WC) (r = 0.147, p = 0.027) and sagittal Abdominal Diameter (SAD) (r = 0.184, p = 0.007) correlated to PWV at follow-up. Challenged with sex, SBP and HbA1c, the association between SAD, not WC nor BMI, and PWV remained statistically significant (p = 0.036). In a stepwise linear regression, entering both SAD and WC, the association between SAD and PWV was stronger than the association between WC and PWV.ConclusionsWe conclude that apoB and CRP, but not LDL-cholesterol predicted subclinical atherosclerosis. Furthermore, SAD was more independent in predicting arterial stiffness over time, compared with WC, in middle-aged men and women with type 2 diabetes.
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5.
  • Dahlén, Elsa, 1975- (författare)
  • Markers of subclinical atherosclerosis and arterial stiffness in type 2 diabetes
  • 2011
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Background: Type 2 diabetes is a common disease with increased mortality and morbidity due to cardiovascular disease (CVD). This thesis is based on three studies that evaluated traditionally used and emerging risk markers to identify individuals with high-risk of developing CVD in middle-aged men and women with type 2 diabetes. One study was conducted to compare the equivalence between two different ultrasound techniques to measure intima-media thickness since IMT was used to evaluate subclinical atherosclerosis as a surrogate endpoint.Methods: Data from the cohort study, cardiovascular risk in type 2 diabetes – a prospective study in primary care (CARDIPP) was used in paper I, III and IV. In paper I, baseline data from the first 247 subjects was analysed. Associations between traditionally measured lipids, apolipoproteins, glycaemic control and low-grade inflammation and IMT were analysed.In paper III, the full baseline cohort, with data from 761 subjects from the CARDIPP study was cross-sectionally analysed regarding correlations between abdominal obesity measured as waist circumference (WC) and sagittal abdominal diameter (SAD), inflammatory markers and IMT and pulse wave velocity (PWV). In paper IV, the associations reported in paper I and III were prospectively investigated with data from the first year of follow-up four years after the baseline investigations in CARDIPP-revisited.In paper II a study was performed on 24 young healthy subjects, both men and women. IMT was measured in the common carotid artery (CCA) and in the abdominal aorta (AA), by two skilled ultrasonographers, with 2 different ultrasound techniques in a randomised order.Results: ApoB/apoA-I ratio (r=0.207, p=0.001), apoB (r=0.166, p=0.009) and non HDLcholesterol (nHDL-c) (0.129, p=0.046) correlated with IMT.In CCA IMT was equivalent using B-mode- and M-mode respectively. However in AA, IMT was 11.5% thicker using B-mode.Abdominal obesity were significantly correlated with; IL-6 and CRP (both p<0.001, WC and SAD respectively), IMT (WC p=0.012, SAD p=0.003) and PWV (p<0.001 WC and SAD respectively). Adjusting for age, sex, treatment with statins, systolic blood pressure (SBP), Body Mass Index (BMI), CRP and HbA1c, SAD (p=0.047) but not WC, remained associated with IMT.There were significant correlations between apoB (r=0.144, p=0.03) and CRP (r=0.172, p=0.009) measured at baseline and IMT measured at follow-up. After adjustment for sex, age, treatment with statins and Hba1c, the associations remained statistically significant. HbA1c, total cholesterol or LDL-cholesterol did not correlate to IMT at follow-up. Baseline body mass index (BMI) (r=0.130, p=0.049), WC (r=0.147, p=0.027) and SAD (r=0.184, p=0.007) correlated to PWV at follow-up. Challenged with sex, SBP and HbA1c, the association between SAD, not WC nor BMI, and PWV remained statistically significant (p=0.036).Conclusions: There was a significant association between apoB/apoA-I ratio and IMT. The association was independent of conventional lipids, CRP, glycaemic control and use of statins. Both SAD and WC were associated with inflammation, atherosclerosis and arterial stiffness. However, SAD was slightly more robustly associated to subclinical organ damage, compared with WC. Prospectively; apoB and CRP, but not LDL-cholesterol predicted increased subclinical atherosclerosis. Furthermore, SAD was more independent in predicting arterial stiffness over time, compared with WC, in middle-aged men and women with type 2 diabetes.The two different ultrasound techniques, B-mode and M-mode, measured different IMT thickness in the aorta, emphasizing the importance of using similar technique when comparing the impact of absolute values of IMT on cardiovascular disease.
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6.
  • Dahlén, Johan, et al. (författare)
  • Spontaneous formation of gamma-hydroxybutyric acid from gamma-butyrolactone in tap water solutions
  • 2011
  • Ingår i: Forensic Science International. - : Elsevier Science B.V., Amsterdam.. - 0379-0738 .- 1872-6283. ; 210:1-3, s. 247-256
  • Tidskriftsartikel (refereegranskat)abstract
    • The spontaneous conversion of g-butyrolactone (GBL) to g-hydroxybutyric acid (GHB) in seven different Swedish tap waters was investigated. The waters used in the study were selected to represent the diversity among Swedish tap waters as well as possible, which was enabled by principal component analysis (PCA) of a number of water quality parameters. GBL solutions (5, 25 and 50% v/v) were prepared in each of the tap waters and in deionized water and the formation of GHB was followed over time. The GHB quantifications were made using a CZE method, employing a carrier electrolyte consisting of 25 mM benzoic acid, 54 mM tris(hydroxymethyl) aminomethane (Tris) and 1.7 mM tetradecyltrimethylammonium bromide (TTAB), which was developed as a part of the current study. Data evaluation showed that the formation of GHB was largely dependent on the type of tap water. For example, there was a negative correlation between the kinetics of the GHB formation and the alkalinity of the tap waters (r(2) = 0.990). This could be explained by a faster decrease in pH in the waters with low buffering capacity (i.e. low alkalinity), which catalysed the hydrolysis of GBL. Equilibrium was reached after 40-250 days depending on the initial GBL concentration and the type of tap water. The level of the equilibrium appeared to be dependent on the initial GBL concentration and ranged from 26 to 37%. Gained knowledge on the levels of the GHB/GBL equilibrium and the kinetics of the formation of GHB in tap water solutions of GBL, including the influence of the tap water quality, may be useful information for casework with the GHB/GBL problem in focus. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
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9.
  • Sommar, Johan Nilsson, et al. (författare)
  • Quality of life in relation to the traffic pollution indicators NO2 and NOx: Results from the Swedish GA2LEN survey
  • 2014
  • Ingår i: BMJ Open Respiratory Research. - : BMJ. - 2052-4439. ; 1, s. e000039-
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Asthma is a chronic disease that may affect daily activities and quality of life. Asthmatics have higher incidence of chronic rhinosinusitis (CRS) and asthma is associated with sinonasal inflammation and nasal symptoms, that all impair quality of life. Worsening of asthma has been found associated with levels of nitrogen dioxide as traffic indicator. Aims: The aim of the study was to evaluate the impact of traffic pollution indicated by nitrogen oxides (NO2 and NOx) on quality of life in asthmatic persons, individuals with CRS and controls. Methods: Within the Swedish Ga2len (Global Allergy and Asthma European Network), 605 asthmatics with and without CRS, 110 individuals with CRS only and 226 controls from four cities were surveyed. The mini Asthma Quality of life Questionnaire (mAQLQ) and the Euro Quality of Life (EQ-5D) health questionnaire were used. Air pollution concentrations at the home address were modelled using dispersion models. Results: Levels of NO2 (geometric mean 10.1 μg/m3 (95% CI 9.80 to 10.5) and NOx (12.1 μg/m3, 11.7 to 12.6) were similar among conditions (controls, asthmatics, individuals with CRS and asthmatics with CRS). The mAQLQ overall score was not found associated with levels of NO2 or NOx, with or without adjustments, and neither was scores within each of the four domains of mAQLQ: symptoms, activity limitations, emotional functions and effects of environmental stimuli. The mean EQ-5D index value, based on the five dimensions mobility, self-care, usual activities, pain/discomfort and anxiety depression, was also found unrelated to NO2 and NOx. Conclusions: At moderate exposure levels traffic pollution appears not to affect quality of life. © 2014, BMJ Publishing Group. All rights reserved.
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10.
  • Swahn, Johan, 1979- (författare)
  • If I can taste it, I want it... : sensory marketing in grocery retail stores
  • 2011
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Avhandlingen syftar till att undersöka hur man kan utveckla ett kognitivt baserat sensoriskt språk för olika produkter i detaljhandel och därefter använda det i marknadsföringen i butiksledet. Vidare undersökts om denna marknadsföring har någon effekt på konsumenternas val av produkt. Inom forskningsprocessen, tvärvetenskapligprocess, används metodik och teorier inom sensorik, lingvistik (semantik) och marknadsföring (konsumentbeteende). I en sensorisk studie jämfördes en tränad sensorisk panel och en grupp konsumenters förmåga att beskriva och analysera olika produkters sensoriska egenskaper. Resultatet visade på att de två gruppernas beskrivningar av de olika produkterna var relativt överensstämmande. Att beskriva smak verbalt anses som relativt svårt och komplext. Baserat på det sensoriska resultatet analyserades egenskapsorden ytterligare utifrån ett lingvistiskt perspektiv, semantik. Den semantiska analysen, empiriska resultat och teori, påvisade en möjlighet att utvinna värdefulla attribut från mer diffusa attribut, t.ex. ”nötig smak” – som kan härledas från sort, e.g. ”mandel” som i sin tur innefattar olika egenskaper i form a smak, doft, textur etc. För att ta reda på om de sensoriska beskrivningarna hade någon effekt på konsumenternas beteende och val i butik genomfördes två empiriska studier. Konsumenternas val av produkt i butik studerades utifrån olika variabler; sensoriska beskrivningar, sensoriska och semantiska beskrivningar, sortnamn, pris, och smak preferens. Resultatet visade att de sensoriska beskrivningarna påverkade konsumenternas val av produkt, t.ex. när bara sort namn kommunicerades var man benägen att välja en känd sort, men när man använde sig av sensoriska beskrivningar skiftade konsumenternas val och de var inte längre styrda av det mer välkända sortnamnet. Vidare visade det sig att konsumenterna vara mindre priskänslig när sensoriska beskrivningar visades. Konklusion: Användningen av ett sensoriskt språk i marknadsföringen av de undersökta livsmedlen påverkade konsumenternas val av produkt i butik samt att konsumenterna tenderade till att vara mindre priskänslig när sensoriska beskrivningar användes.
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