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Während kein Zweifel darüber besteht, dass manifeste Schilddrüsenerkrankungen signifikante Effekte auf das Herz-Kreislauf-System aufweisen, ist die Evidenzlage bezüglich der Assoziationen von subklinischen Schilddrüsenauffälligkeiten mit kardiovaskulären Risikofaktoren und Erkrankungen weitaus weniger konsistent. Aus diesem Grunde habe ich mich in meiner Dissertation mit dem Zusammenhang von subklinischen Schilddrüsenauffälligkeiten und Mortalität bzw. der Entwicklung von Bluthochdruck innerhalb der „Study of Health in Pomerania“ (SHIP) beschäftigt. SHIP ist eine große Bevölkerungsstudie in Ostvorpommern. Zwischen 1997 und 2001 nahmen 4308 Probanden an der Erstuntersuchung teil. Zwischen 2002 und 2006 haben davon 3300 Probanden an einem Untersuchungs-Follow-Up teilgenommen. Meine Analysen haben gezeigt, dass kein Zusammenhang zwischen einer subklinischen Schilddrüsenüberfunktion und der Entwicklung von Bluthochdruck zwischen Erstuntersuchung und Follow-Up-Untersuchung besteht. Ebenfalls konnte ich nicht zeigen, dass eine Assoziation zwischen einer subklinischen Schilddrüsenüberfunktion und Mortalität besteht. Diese Ergebnisse sind wichtig, da sie ein Indiz darauf geben, ob Menschen mit subklinischen Schilddrüsenauffälligkeiten therapiert werden sollten oder nicht. Der zweite Teil meiner Dissertation beschäftigt sich mit der Jodversorgung in Ostvorpommern. Ostvorpommern war bis Anfang der 1990er ein Jodmangelgebiet. In den 1990ern wurde dieser Jodmangel durch Hinzugabe von jodiertem Salz zur Nahrungsproduktion ausgeglichen. Wegen dem lange vorherrschenden Jodmangel haben viele Menschen in Ostvorpommern eine Struma (Schilddrüsenvergrößerung). Die Struma-Prävalenz betrug zur Erstuntersuchung in SHIP 36.1 %. In meiner Analyse habe ich untersucht, inwiefern der Rauchstatus sich auf die Entwicklung einer Struma zwischen Erstuntersuchung und Follow-Up-Untersuchung ausgewirkt hat. Aus der Literatur ist bekannt, dass Raucher in Jodmangelgebieten eher eine Struma entwickeln als Raucher in Gebieten mit ausreichender Jodversorgung. Da ich keinen Zusammenhang zwischen Rauchen und der Entwicklung einer Struma zeigen konnte, spricht dies für eine derzeitig ausreichende Jodversorgung der Bevölkerung in Ostvorpommern.
Background: It has not been investigated whether there are associations between urinary iodine (UI) excretion measurements some years apart, nor whether such an association remains after adjustment for nutritional habits. The aim of the present study was to investigate the relation between iodine-creatinine ratio (ICR) at two measuring points 5 years apart. Methods: Data from 2,659 individuals from the Study of Health in Pomerania were analyzed. Analysis of covariance and Poisson regressions were used to associate baseline with follow-up ICR. Results: Baseline ICR was associated with follow-up ICR. Particularly, baseline ICR >300 µg/g was related to an ICR >300 µg/g at follow-up (relative risk, RR: 2.20; p < 0.001). The association was stronger in males (RR: 2.64; p < 0.001) than in females (RR: 1.64; p = 0.007). In contrast, baseline ICR <100 µg/g was only associated with an ICR <100 µg/g at follow-up in males when considering unadjusted ICR. Conclusions: We detected only a weak correlation with respect to low ICR. Studies assessing iodine status in a population should take into account that an individual with a low UI excretion in one measurement is not necessarily permanently iodine deficient. On the other hand, current high ICR could have been predicted by high ICR 5 years ago.
Background: There is only limited data on the potential association between thyroid dysfunction and peripheral arterial disease (PAD). Objective: The aim of our study was to investigate the potential association of thyroid function, as defined by serum concentrations of the clinically used primary thyroid function marker thyrotropin [i.e. thyroid-stimulating hormone (TSH)] and 3,5-diiodothyronine (3,5-T<sub>2</sub>), with the ankle-brachial index (ABI) as a marker of PAD. Methods: We used data from 5,818 individuals from three cross-sectional population-based studies conducted in Northeast (SHIP-2 and SHIP-TREND) and Central Germany (CARLA). Measurement of serum TSH concentrations was conducted in one central laboratory for all three studies. In a randomly selected subpopulation of 750 individuals of SHIP-TREND, serum 3,5-T<sub>2</sub> concentrations were measured with a recently developed immunoassay. ABI was measured either by a hand-held Doppler ultrasound using the Huntleigh Dopplex D900 or palpatorily by the OMRON HEM-705CP device. Results: Serum TSH concentrations were not significantly associated with ABI values in any of the three studies. Likewise, groups of individuals with a TSH <0.3 mIU/l or with a TSH ≥3.0 mIU/l had no significantly different ABI values in comparison with individuals with a TSH in the reference range. Analyses regarding TSH within the reference range or serum 3,5-T<sub>2</sub> concentrations did not reveal consistent significant associations with the ABI. No sex-specific associations were detected. Conclusions: The results of our study do not substantiate evidence for an association between thyroid function and PAD, but further studies are needed to investigate the associations of overt forms of thyroid dysfunction with PAD.
Background: Abdominal obesity is a major driver for adverse medical conditions. While an interaction between adipose tissue and thyroid function is thought to exist, to our knowledge, no study has examined the effect of thyroid-stimulating hormone (TSH) on visceral adipose tissue (VAT) in a population-based context. Objective: We determined an association between serum TSH levels and VAT. Methods: A sample of 1,021 female and 956 male adults aged 20-79 years was drawn from registry offices in the cross-sectional, population-based Study of Health in Pomerania Trend (SHIP Trend) in Northeast Germany from 2008 to 2012. Our main exposure was serum TSH levels. Our main outcome was VAT measured using magnetic resonance imaging. The possibly mediating role of leptin on the TSH-VAT association was also assessed. Results: A total of 1,719 participants (87.9%) had serum TSH levels within the reference range. The mean volume of VAT was 5.33 liters for men and 2.83 liters for women. No association between TSH and VAT (β = 0.06, 95% CI: -0.02, 0.14) was observed, and there were no differences detected between sexes. VAT was strongly associated with leptin with a greater effect in women than in men. Leptin was strongly associated with TSH. Conclusions: No association between TSH and VAT was observed. Other biomarkers such as leptin may play a role in the relationship between thyroid function and metabolic risk.
Background: Iodine deficiency disorders (IDD) represent a global health threat to individuals and societies. IDD prevention programmes have been introduced in many parts of the world. However, challenges remain, particularly in Europe due to fragmentation and diversity of approaches that are not harmonized. Objectives: This review is dedicated to the public-health impact of IDD prevention programmes. It sums up experiences collected by the EUthyroid consortium so far and provides information on stakeholders that should be involved in actions directed to improve the impact of IDD prevention. Methods: A joint European database for combining registry-based outcome and monitoring data as well as tools for harmonizing study methods were established. Methods for analyzing thyroglobulin from a dried blood spot are available for assessing the iodine status in the general population and at-risk groups. Mother-child cohorts are used for in-depth analysis of the potential impact of mild-to-moderate iodine deficiency on the neurocognitive development of the offspring. A decision-analytic model has been developed to evaluate the long-term effectiveness and cost effectiveness of IDD prevention programmes. Results: EUthyroid has produced tools and infrastructure to improve the quality of IDD monitoring and follows a dissemination strategy targeting policymakers and the general public. There are tight connections to major stakeholders in the field of IDD monitoring and prevention. Conclusions: EUthyroid has taken steps towards achieving a euthyroid Europe. Our challenge is to inspire a greater sense of urgency in both policymakers and the wider public to address this remediable deficit caused by IDD.
Mean platelet volume is more important than age for defining reference intervals of platelet counts
(2019)
Abstract
Introduction
Transabdominal ultrasound (US) and magnetic resonance imaging (MRI) are commonly used for the examination of the pancreas in clinical routine. We therefore were interested in the concordance of these two imaging methods for the size measurement of the pancreas and how age, gender, and body mass index (BMI) affect the organ size.
Methods
A total of 342 participants from the Study of Health in Pomerania underwent whole‐body MRI and transabdominal US on the same day, and the diameter of the pancreatic head, body, and tail were measured. The agreement between US and MRI measurements was assessed by Bland and Altman plots. Intraclass correlation coefficients were used to compare observers. A multivariable regression model was applied using the independent variables age, gender, and body mass index.
Results
Compared to MRI, abdominal US returned smaller values for each segment of the pancreas, with a high level of inconsistency between these two methods. The mean difference was 0.39, 0.18, and 0.54 cm for the head, body, and tail, respectively. A high interobserver variability was detected for US. Multivariable analysis showed that pancreatic size in all three segments increased with BMI in both genders whereas pancreatic head and tail size decreased with age, an effect more marked in women.
Conclusions
Agreement of pancreatic size measurements is poor between US and MRI. These limitations should be considered when evaluating morphologic features for pathologic conditions or setting limits of normal size. Adjustments for BMI, gender, and age may also be warranted.