Automated Complete Blood Cell Count Using Sysmex XN-9000® in the Diagnosis of Newborn Infection.

The early identification of septically infected newborn infants is important for ensuring good outcomes. Blood cell differentiations are helpful, but they are often time consuming and inaccurate. In this study, we evaluated the use of automatic white blood cell differentiations by flow cytometry for the diagnosis of neonatal sepsis. Episodes of suspected infection in neonates were retrospectively classified into two groups, unlikely infection (UI, levels of Interleukin-6 < 400 pg/mL or CRP within 48 h < 10 mg/L), n = 101 and probable infection (PI, Interleukin-6 ≥ 400 pg/mL or CRP within 48 h ≥ 10 mg/L), n = 98. Complete blood cell counts were performed by Sysmex XN-9000® using flow cytometry. Relative and absolute proportions of immature granulocytes were evaluated. Unexpectedly, the absolute count of immature granulocytes was significantly lower in the group of PI compared to UI neonates. Similar results were found when analysing the relative proportion of immature granulocytes among all neutrophil granulocytes. On the other hand, manually counted immature to total (I/T) ratios of granulocytes were higher in PI than in UI infants. Therefore, we conclude that differentiations of granulocytes by Sysmex XN-9000® can be used to distinguish between infected and uninfected neonates if the results are interpreted according to our findings. A low count of immature granulocytes as determined by Sysmex XN-9000® may indicate neonatal infection.

Influencing Factors and Differences in Born Aggregometry in Specialized Hemostaseological Centers: Results of a Multicenter Laboratory Comparison.

Introduction Light transmission aggregometry (LTA) is regarded as the gold standard in platelet function diagnostics. However, there is a relevant degree of interlaboratory variability in practical applications. Objective The aim of the present study was to develop a practicable laboratory comparison on LTA and to analyze differences and influencing factors in regard to standardization in five specialized hemostaseological centers. Methods The study was performed on 30 patients in total. Each center performed LTA on blood samples from six healthy volunteers (three men and three women) using the inductors collagen (Col), adenosine diphosphate (ADP), arachidonic acid (ARA), and ristocetin. The LTA was performed three times using different methods as follows: (1) International Society on Thrombosis and Haemostasis recommendations with identical reagents, (2) in-house protocols and the identical reagents; and (3) in-house protocols and in-house reagents. Results A total of 396 measurements of 30 probands were performed. Even after standardization of the protocol and using identical reagents, there were significant differences between the centers regarding the final and maximum aggregation ( p = 0.002 and <0.001) and further significant differences in the maximum and final aggregation according to the wavelength of the device used to measure the LTA (PAP-8: 430 nm, APACT 4004: 740 nm [ p < 0.001 each]). Using identical reagents but individual inductor concentrations and laboratory protocols also resulted in different maximum and final aggregation. The largest differences were seen with Col and ristocetin; there were significant influences from the reagents' manufacturers in the results of aggregometry for the inductor Col ( p < 0.01) but not for ADP, ARA, and ristocetin. Conclusion In this study, we proved that there are significant influences from the used aggregometers, inductors concentrations, and manufacturers. These results illustrate the challenges and importance of standardization of LTA.

Atherosclerosis, myocardial infarction and primary hemostasis: Impact of platelets, von Willebrand factor and soluble glycoprotein VI.

INTRODUCTION: Little is known about peril constellations in primary hemostasis contributing to an acute myocardial infarction (MI) in patients with already manifest atherosclerosis. The study aimed to establish a predicting model based on six biomarkers of primary hemostasis: platelet count, mean platelet volume, hematocrit, soluble glycoprotein VI, fibrinogen and von Willebrand factor ratio. MATERIALS AND METHODS: The biomarkers were measured in 1.491 patients with manifest atherosclerosis of the Leipzig (LIFE) heart study. Three groups were divided: patients with coronary artery disease (900 patients) and patients with atherosclerosis and either ST-elevated MI (404 patients) or Non-ST-elevated MI (187 patients). Correlations were analyzed by non-linear analysis with Self Organizing Maps. Classification and discriminant analysis was performed using Learning Vector Quantization. RESULTS AND CONCLUSIONS: The combination of hemostatic biomarkers is regarded as valuable tool for identifying patients with atherosclerosis at risk for MI. Nevertheless, our study contradicts this belief. The biomarkers did not allow to establish a predicting model usable in daily patient care. Good specificity and sensitivity for the detection of MI was only reached in models including acute phase parameters (specificity 0,9036, sensitivity 0,7937 in men; 0,8977 and 0,8133 in women). In detail, hematocrit and soluble glycoprotein VI were significantly different between the groups. Significant dissimilarities were also found for fibrinogen (in men) and von Willebrand factor ratio. In contrast, the most promising parameters mean platelet volume and platelet count showed no difference, which is an important contribution to the controversy concerning them as new risk and therapy targets for MI.

Is Interleukin-6 a better predictor of successful antibiotic therapy than procalcitonin and C-reactive protein? A single center study in critically ill adults.

BACKGROUND: The aim of this study was to evaluate whether Interleukin-6 (IL-6) could be a faster indicator of treatment success in adults with severe sepsis and septic shock compared to procalcitonin (PCT) and C-reactive protein (CRP). METHODS: Data from adult patients with severe sepsis and septic shock managed at the medical intensive care unit (ICU) of the University Hospital Leipzig between September 2009 and January 2012 were analyzed retrospectively. Values for CRP, PCT and IL-6 on admission as well as after 24 and 48-72 h were collected. Antibiotic therapy was defined as clinically successful if the patient survived ICU stay. RESULTS: A total of 328 patients with severe sepsis and septic shock with adequate data quality were included. After 48-72 h, the median IL-6 was significantly lower in survivors than in non-survivors (114.2 pg/ml vs. 746.6 pg/ml; p < 0.001), while there was no significant difference for PCT (5.6 vs. 4.9 ng/ml; p = 0.586) and CRP (158.5 mg/l vs. 172.4 mg/l; p = 0.988). CONCLUSIONS: The results of this study suggest that IL-6 is better than PCT and CRP in predicting the treatment success in predominantly non-surgical sepsis in the first 48-72 h.

Analytical performance and diagnostic potential of immunoassays determining intact immunoglobulin kappa/lambda ratios in monoclonal gammopathies.

BACKGROUND: Hevylite chain (HLC) assays with specificity for epitopes at the junction between heavy and light chains of intact immunoglobulins (Ig) allow quantification of Ig kappa/lambda ratios of the three major Ig classes. Calculated Ig kappa/lambda ratios outside the reference range indicate a monoclonal background. The primary aim of the present study was to analytically validate HLC assays and to investigate their diagnostic potential in relation to immunofixation electrophoresis (IFE) as the standard method for identification of monoclonal proteins (MPs). A second aim was to investigate the diagnostic potential of HLC assays in disease monitoring. METHODS: Precision, linearity, accuracy, sensitivity, and specificity of HLC assays for Ig classes A, G, and M were determined as parameters of analytical performance. The diagnostic performance of HLC assays in the detection of MPs was investigated in patient sera revealing monoclonal bands in IFE (n = 156). The utility of the assays in disease monitoring was investigated in a proof of principal approach by quantification of HLC ratios in subsequent sera from stem cell transplanted (ScTx) myeloma patients (n = 4). RESULTS: All six HLC assays revealed analytical performances suitable for application in routine diagnostics. With regard to diagnostic performance, all samples with IgA MPs in IFE (n = 54) could be identified in the HLC IgA assay. Of sera showing IgG MP in IFE (n = 69), 57 could be identified in the HLC IgG assay, whereas 12 had normal IgG kappa/lambda ratios. Of sera showing IgM MP in IFE (n = 26), 25 could be identified in the HLC IgM assay, 1 serum revealed a normal IgM kappa/lambda ratio. ScTx patients achieving IFE-negative remission had normal HLC ratios. Those who failed to achieve IFE-negative remission showed normalization of conventional monitoring parameters but revealed HLC ratios never reaching reference range. CONCLUSIONS: HLC assays exhibit analytical performances suitable for clinical routine application. Our preliminary data from ScTx patients suggest a diagnostic potential especially of HLC IgA assay in disease monitoring. Other than that, combined application of HLC assays does not represent an alternative to IFE in first line diagnostics, in particular due to the limited diagnostic performance of the HLC IgG assay.

FADS1 FADS2 gene cluster, PUFA intake and blood lipids in children: results from the GINIplus and LISAplus studies.

BACKGROUND: Elevated cholesterol levels in children can be a risk factor for cardiovascular diseases in later life. In adults, it has been shown that blood lipid levels are strongly influenced by polymorphisms in the fatty acid desaturase (FADS) gene cluster in addition to nutritional and other exogenous and endogenous determinants. Our aim was to investigate whether lipid levels are determined by the FADS genotype already in children and whether this association interacts with dietary intake of n-3 fatty acids. METHODS: The analysis was based on data of 2006 children from two German prospective birth cohort studies. Total cholesterol, HDL, LDL and triglycerides were measured at 10 years of age. Six single nucleotide polymorphisms (SNPs) of the FADS gene cluster were genotyped. Dietary n-3 fatty acid intake was assessed by food frequency questionnaire. Linear regression modeling was used to assess the association between lipid levels, n-3 fatty acid intake and FADS genotype. RESULTS: Individuals carrying the homozygous minor allele had lower levels of total cholesterol [means ratio (MR) ranging from 0.96 (p = 0.0093) to 0.98 (p = 0.2949), depending on SNPs] and LDL [MR between 0.94 (p = 0.0179) and 0.97 (p = 0.2963)] compared to homozygous major allele carriers. Carriers of the heterozygous allele showed lower HDL levels [ß between -0.04 (p = 0.0074) to -0.01 (p = 0.3318)] and higher triglyceride levels [MR ranging from 1.06 (p = 0.0065) to 1.07 (p = 0.0028)] compared to homozygous major allele carriers. A higher n-3 PUFA intake was associated with higher concentrations of total cholesterol, LDL, HDL and lower triglyceride levels, but these associations did not interact with the FADS1 FADS2 genotype. CONCLUSION: Total cholesterol, HDL, LDL and triglyceride concentrations may be influenced by the FADS1 FADS2 genotype already in 10 year old children. Genetically determined blood lipid levels during childhood might differentially predispose individuals to the development of cardiovascular diseases later in life.

Identification of three novel plasminogen (PLG) gene mutations in a series of 23 patients with low PLG activity.

Inherited severe hypoplasminogenaemia is a multisystemic disorder leading to deficient extravascular fibrinolysis. As a clinical consequence wound healing capacity of mucous membranes is markedly impaired leading to ligneous conjunctivitis and several other manifestations. Here we report the molecular genetic and clinical findings on 23 new cases with severe hypoplasminogenaemia. Homozygous or compound-heterozygous mutations in the plasminogen (PLG) gene were found in 16 of 23 patients (70%), three of which were novel mutations reported here for the first time (C166Y, Y264S, IVS10-7T/G). Compared to 79 previously published cases, clinical manifestations of the current group of patients showed higher percentages of ligneous periodontitis, congenital hydrocephalus, and involvement of the female genital tract. In contrast, involvement of the gastrointestinal or urogenital tract was not observed in any of the cases. Patients originated to a large extent (61%) from Turkey and the Middle East, and showed a comparably frequent occurrence of consanguinity of affected families and a greater female to male ratio than was derived from previous reports in the literature. Individual treatment of ligneous conjunctivitis included topical plasminogen or heparin eye drops, topical or systemic fresh frozen plasma, and surgical removal of ligneous pseudomembranes, mostly with modest or transient efficacy. In conclusion, the present study underscores the broad range of clinical manifestations in PLG-deficient patients with a trend to regional differences. Transmission of genetic and clinical data to the recently established Plasminogen Deficiency Registry should help to determine the prevalence of the disease and to develop more efficient treatment strategies.

Levels of lipids in preterm infants fed breast milk.

BACKGROUND: Actual recommendations in preterm infants limit parenteral fat intake to 3-4 g/kg/d. This is based on clinical studies where fat administration was adjusted to achieve levels close to those recommended in adults for atherosclerosis prevention. Data about lipid profiles of breast fed preterm infants who may have fat intakes of up to 7 g/kg/d and could serve as reference are not available. OBJECTIVE: To establish full lipid profiles in healthy fully breast fed preterm infants and to test the hypothesis that breast milk fat intake leads to serum triglycerides higher than those achieved under full parenteral fat administration. DESIGN: Serum triglycerides, cholesterol, VLDL, LDL, HDL (all pre- and postprandial), as well as triglycerides in breast milk were measured in 65 healthy, fully breast fed, stable growing preterm infants stratified in 500 g intervals (mean gestational age: 31+/-4 weeks, birth weight: 1500+/-600 g, age at study: 25+/-16 d). RESULTS: Median fat intake was 7.0 g/kg/d (interquartile range: 5.8;8.1) and led to the following serum levels: triglycerides 0.9 (0.6;1.1), cholesterol 3.1 (2.6;3.5), VLDL 0.5 (0.3;0.6), LDL 1.3 (1.1;1.6), HDL 1.1 (0.8;1.4)mmol/L. Small for gestational age infants showed higher triglycerides (p=0.005). Triglycerides (r2=0.08, p=0.023), postprandial triglyceride increase (r2=0.21, p<0.001), cholesterol (r2=0.16, p<0.001) and HDL (r2=0.16, p<0.001) were correlated with weight at study. CONCLUSION: Though higher by a factor of two, fat intake by breast milk leads to considerably lower lipid levels when compared to published values obtained under parenteral fat intake. Results suggest that either fat absorption is reduced in preterm infants, or the composition of breast milk supports a lower profile of fat levels when compared to commercially available parenteral fat emulsions.

Cardioprotective effects of mineralocorticoid receptor antagonists at reperfusion.

AIMS: Pre-treatment with mineralocorticoid receptor (MR) antagonists is reported to reduce myocardial infarct size from ischaemia/reperfusion. Here, we tested whether the MR antagonists potassium canrenoate and eplerenone could protect in the more clinically relevant schedule of administration at the end of ischaemia. METHODS AND RESULTS: In all models, hearts were subjected to 30 min regional ischaemia followed by 120 min (rabbits 4 h) reperfusion. A bolus of canrenoate 5 min prior to reperfusion in open-chest mice decreased infarct size in a dose-dependent manner. Maximum protection was seen at 1 mg/kg where infarction was 18% of that in the control (P < 0.001). Ecto-5'-nucleotidase (CD73) as well as adenosine A(2b) receptor knock-out mice could no longer be protected, suggesting a role for adenosine and the A(2b) receptor in the mechanism. A 1 mg/kg bolus of canrenoate prior reperfusion also reduced infarct size in open-chest rabbits. To explore the underlying mechanisms, we studied isolated rat hearts. Eplerenone (10 microM) at the end of ischaemia was similarly protective in the rat heart and the protection was abolished by co-treatment with inhibitors of the adenosine receptor, protein kinase C, PI3-kinase, and ERK. In addition, eplerenone or canrenoate treatment increased phosphorylation of the pro-survival kinases Akt and ERK1/2 at reperfusion in the rat hearts. CONCLUSION: Taken together, MR antagonists when given at the end of ischaemia are highly effective and potent cardioprotective drugs with a signalling similar to that of ischaemic pre-conditioning and, hence, could be a very promising candidate for the treatment of acute myocardial infarction in man.