TNFa-Freisetzung bei Ischämie und Reperfusion von pharmakologisch behandelten und genetisch modifizierten Mäuseherzen

Diese Dissertation handelt von der TNFa Freisetzung von isoliert, reperfundierten Mäuseherzen nach 15 min Ischämie und 90 min Reperfusion im Vergleich zu normoxisch perfundierten Mäuseherzen. Zudem sollte mit Hilfe von k.o.-Mäusenherzen und pharmakologischen Interventionen versucht werden, Rückschlüsse auf den zellulären Ursprungsort des TNFa zu bekommen und über dessen Freisetzungsmechanismus. TNFa wird nach 15 min Ischämie in zwei Phasen während der Reperfusion freigesetzt: direkt nach der Ischämie und nach 60-90 min. Normoxisch perfundierte Herzen zeigten dagegen einen Basaltonus des TNFa von 1,5pg/min über den gesamten Versuchsablauf. Der erste Gipfel der TNFa Freisetzung konnte als rein kinetisches Phänomen -wash-out- identifiziert werden, während es sich beim zweiten Gipfel um eine de-novo Synthese des TNFa handelt. Interleukin-6 und die Matrix-Metalloprotease-7 sind essentielle Faktoren für die TNFa Freisetung nach 60-90 min. Mastzellen können als Ursprungszelle des zweiten Gipfels ausgeschlossen werden.Sie sind neben Makrophagen und Endothelzellen am Basaltonus der TNFa Freisetzung beteiligt

Abdominal obesity is associated with microalbuminuria and an elevated cardiovascular risk profile in patients with hypertension

BACKGROUND: Overweight and obesity are frequently associated with preventable death and have emerged as a major challenge to public health. There is an ongoing debate on the role of abdominal obesity and its value in predicting cardiovascular and renal outcomes. The present analysis evaluates the prevalence of microalbuminuria (MAU) and conventional cardiovascular risk factors in relation to measures of general and abdominal obesity. METHODS: In this multinational, observational study, 20828 hypertensive out-patients from 26 countries including Europe, North and Latin America, Middle East, and Asia were analyzed. Urinary dipstick screening for MAU was performed as well as data on patient demographics, anthropometric measures, cardiovascular risk factors, comorbid conditions, and cardiovascular drug therapy collected. MAU prevalence was determined by a stepwise logistic regression analysis with cardiovascular risk factors as univariate. RESULTS: In the univariate analysis, MAU prevalence systematically increased with body mass index (BMI) from 54.4% (1st tertial) to 62.1% (3rd tertial) (p < 0.0001), an increase which was also observed for waist circumference (WC). At any level of BMI, MAU increased with WC from 53.5%, 54.8%, and 55.0% (1st tertial of WC in all three BMI tertials) to 61.4%, 62.1%, and 64.0% (3rd tertial of WC in all BMI tertials) (p < 0.0001). In the multivariate analysis, WC, but not BMI was independently associated with MAU. Furthermore, overweight/obesity were associated with the presence of modifiable and nonmodifiable risk factors. CONCLUSION: An abnormal WC, but not BMI appears to be independently associated with MAU, an early marker of cardiovascular and renal risk. Increasing WC confers an incremental risk for MAU at any level of BMI, underlining the prognostic importance of abdominal fat accumulation beyond general obesity

Geographical Distribution and Genetic Diversity of Bank Vole Hepaciviruses in Europe

The development of new diagnostic methods resulted in the discovery of novel hepaciviruses in wild populations of the bank vole (Myodes glareolus, syn. Clethrionomys glareolus). The naturally infected voles demonstrate signs of hepatitis similar to those induced by hepatitis C virus (HCV) in humans. The aim of the present research was to investigate the geographical distribution of bank vole-associated hepaciviruses (BvHVs) and their genetic diversity in Europe. Real-time reverse transcription polymerase chain reaction (RT-qPCR) screening revealed BvHV RNA in 442 out of 1838 (24.0%) bank voles from nine European countries and in one of seven northern red-backed voles (Myodes rutilus, syn. Clethrionomys rutilus). BvHV RNA was not found in any other small mammal species (n = 23) tested here. Phylogenetic and isolation-by-distance analyses confirmed the occurrence of both BvHV species (Hepacivirus F and Hepacivirus J) and their sympatric occurrence at several trapping sites in two countries. The broad geographical distribution of BvHVs across Europe was associated with their presence in bank voles of different evolutionary lineages. The extensive geographical distribution and high levels of genetic diversity of BvHVs, as well as the high population fluctuations of bank voles and occasional commensalism in some parts of Europe warrant future studies on the zoonotic potential of BvHVs.Peer reviewe

Peri-operative red blood cell transfusion in neonates and infants: NEonate and Children audiT of Anaesthesia pRactice IN Europe: A prospective European multicentre observational study

BACKGROUND: Little is known about current clinical practice concerning peri-operative red blood cell transfusion in neonates and small infants. Guidelines suggest transfusions based on haemoglobin thresholds ranging from 8.5 to 12 g dl-1, distinguishing between children from birth to day 7 (week 1), from day 8 to day 14 (week 2) or from day 15 (≥week 3) onwards. OBJECTIVE: To observe peri-operative red blood cell transfusion practice according to guidelines in relation to patient outcome. DESIGN: A multicentre observational study. SETTING: The NEonate-Children sTudy of Anaesthesia pRactice IN Europe (NECTARINE) trial recruited patients up to 60 weeks' postmenstrual age undergoing anaesthesia for surgical or diagnostic procedures from 165 centres in 31 European countries between March 2016 and January 2017. PATIENTS: The data included 5609 patients undergoing 6542 procedures. Inclusion criteria was a peri-operative red blood cell transfusion. MAIN OUTCOME MEASURES: The primary endpoint was the haemoglobin level triggering a transfusion for neonates in week 1, week 2 and week 3. Secondary endpoints were transfusion volumes, 'delta haemoglobin' (preprocedure - transfusion-triggering) and 30-day and 90-day morbidity and mortality. RESULTS: Peri-operative red blood cell transfusions were recorded during 447 procedures (6.9%). The median haemoglobin levels triggering a transfusion were 9.6 [IQR 8.7 to 10.9] g dl-1 for neonates in week 1, 9.6 [7.7 to 10.4] g dl-1 in week 2 and 8.0 [7.3 to 9.0] g dl-1 in week 3. The median transfusion volume was 17.1 [11.1 to 26.4] ml kg-1 with a median delta haemoglobin of 1.8 [0.0 to 3.6] g dl-1. Thirty-day morbidity was 47.8% with an overall mortality of 11.3%. CONCLUSIONS: Results indicate lower transfusion-triggering haemoglobin thresholds in clinical practice than suggested by current guidelines. The high morbidity and mortality of this NECTARINE sub-cohort calls for investigative action and evidence-based guidelines addressing peri-operative red blood cell transfusions strategies. TRIAL REGISTRATION: ClinicalTrials.gov, identifier: NCT02350348

Heart rate: A global target for cardiovascular disease and therapy along the cardiovascular disease continuum

AbstractHeart rate is a predictor of cardiovascular and all-cause mortality in the general population and in patients with cardiovascular disease. Increased resting heart rate multiplies risk and interferes at all stages of the cardiovascular disease continuum initiating from endothelial dysfunction and continuing via atherosclerotic lesion formation and plaque rupture to end-stage cardiovascular disease. As a therapeutic target, heart rate is accessible via numerous pharmacological interventions. The concept of selective heart rate reduction by the I(f) current inhibitor ivabradine provides an option to intervene effectively along the chain of events and to define the specific and prognostic role of heart rate for patients with coronary artery disease and heart failure. Future interventional studies will further clarify the significance of heart rate and targeted heart rate reduction for primary and secondary prevention in cardiovascular and cerebrovascular events

What is the role of increased heart rate and why is it beneficial to reduce it?

Increased heart rate is an independent risk factor for patients with cardiovascular disease, in particular those with arterial hypertension, myocardial infarction, coronary artery disease, heart failure, and extracardiac comorbidities like microalbuminuria. This relation is supported by a large number of animal studies as well as clinical trials, which are summarized in this article. These studies demonstrate the detrimental effects of increased heart rate on the structure and function of the cardiovascular system. Heart rate can be easily measured during physical examination of the patient, therefore allowing us to make a simple assessment of the prognosis and efficiency of therapy. Thus heart rate, which can selectively be reduced by If channel inhibition, seems to be a therapeutic target in cardiolog

Echocardiographic evidence of an intrapulmonary shunt in a patient with severe liver cirrhosis

Background!#!Since 1901, at least 15 scholars who contributed to cardiovascular research have received a Nobel prize in physiology or medicine.!##!Methods!#!Using the Nobel nomination database (nobelprize.org), which contains 5950 nominations in the accessible period from 1901 to 1953 in physiology or medicine, we listed all international nominees who contributed to cardiovascular research. We subsequently collected nomination letters and jury reports of the prime candidates from the archive of the Nobel Committee in Sweden to identify shortlisted candidates.!##!Results!#!The five most frequently nominated researchers with cardiovascular connections from 1901 to 1953 were, in descending order, the surgeon René Leriche (1879-1955) (FR) with a total of 79 nominations, the physiologist and 1924 Nobel laureate Willem Einthoven (1860-1927) (NL) (31 nominations), the surgeon Alfred Blalock (1899-1964) (US) (29 nominations), the pharmacologist and 1936 Nobel laureate Otto Loewi (1873-1961) (DE, AT, US) (27 nominations) and the paediatric cardiologist Helen Taussig (1898-1986) (US) (24 nominations). The research of these scholars merely hints at the width of topics brought up by nominators ranging from the physiological and pathological basics to the diagnosis and (surgical) interventions of diseases such as heart malformation or hypertension.!##!Conclusion!#!We argue that an analysis of Nobel Prize nominations can reconstruct important scientific trends within cardiovascular research during the first half of the twentieth century

Impact of heart rate, aortic compliance and stroke volume on the aortic regurgitation fraction studied in an ex vivo pig model

Introduction Drug therapy to reduce the regurgitation fraction (RF) of high-grade aortic regurgitation (AR) by increasing heart rate (HR) is generally recommended. However, chronic HR reduction in HFREF patients can significantly improve aortic compliance and thereby potentially decrease RF. To clarify these contrasts, we examined the influence of HR, aortic compliance and stroke volume (SV) on RF in an ex vivo porcine model of severe AR.Methods Experiments were performed on porcine ascending aorta with aortic valves (n=12). Compliance was varied by inserting a Dacron graft close to the aortic valve. Both tube systems were connected to a left heart simulator varying HR and SV. AR was accomplished by punching a 0.3 cm2 hole in one aortic cusp. Flow, RF, SV and aortic pressure were measured, aortic compliance with transoesophageal ultrasound probes.Results Compliance of the aorta was significantly reduced after Dacron graft insertion (0.55%±0.21%/mm Hg vs 0.01%±0.007%/mm Hg, p&lt;0.001, respectively). With increasing HR, RF was significantly reduced in each steady state of the native aorta (HR 40 bpm: 88%±7% vs HR 120 bpm: 42%±10%; p&lt;0.001), but Dacron tube did not affect RF (HR 40 bpm: 87%±8%; p=0.79; HR 120 bpm: 42%±3%; p=0.86). Increasing SV also reduced RF independent of the stiff Dacron graft.Conclusion Aortic compliance did not affect AR in the ex vivo porcine model of AR. RF was significantly reduced with increasing HR and SV. These results affirm that HR lowering and negative inotropic drugs should be avoided to treat severe AR