scholarly journals Plasma and Red Cell Reference Intervals of 5-Methyltetrahydrofolate of Healthy Adults in Whom Biochemical Functional Deficiencies of Folate and Vitamin B12Had Been Excluded

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Agata Sobczyńska-Malefora ◽  
Dominic J. Harrington ◽  
Kieran Voong ◽  
Martin J. Shearer
Keyword(s):  
Methylmalonic Acid ◽  
Reference Intervals ◽  
Healthy Adults ◽  
Molecular Forms ◽  
Vitamin B ◽  
Red Cell ◽  
Relationship Of ◽  
The Relationship ◽  
Plasma Measurements ◽  
Functional Deficiency

5-Methyltetrahydrofolate (5-MTHF) is the predominant form of folate and a strong determinant of homocysteine concentrations. There is evidence that suboptimal 5-MTHF availability is a risk factor for cardiovascular disease independent of homocysteine. The analysis of folates remains challenging and is almost exclusively limited to the reporting of “total” folate rather than individual molecular forms. The purpose of this study was to establish the reference intervals of 5-MTHF in plasma and red cells of healthy adults who had been prescreened to exclude biochemical evidence of functional deficiency of folate and/or vitamin B12. Functional folate and vitamin B12status was assessed by respective plasma measurements of homocysteine and methylmalonic acid in 144 healthy volunteers, aged 19–64 years. After the exclusion of 10 individuals, values for 134 subjects were used to establish the upper reference limits for homocysteine (13 μmol/L females and 15 μmol/L males) and methylmalonic acid (430 nmol/L). Subjects with values below these cutoffs were designated as folate and vitamin B12replete and their plasma and red cell 5-MTHF reference intervals determined,N=126: 6.6–39.9 nmol/L and 223–1041 nmol/L, respectively. The application of these intervals will assist in the evaluation of folate status and facilitate studies to evaluate the relationship of 5-MTHF to disease.

scholarly journals Hemoglobin L Ferrara in a Jewish Family Associated with a Hemolytic State in the Propositus

Blood ◽  
1969 ◽  
Vol 34 (2) ◽  
pp. 157-165 ◽  
Author(s):  
RONALD L. NAGEL ◽  
HELEN M. RANNEY ◽  
THOMAS B. BRADLEY ◽  
ALAN JACOBS ◽  
LINDA UDEM
Keyword(s):  
Family Study ◽  
Simultaneous Occurrence ◽  
Red Cell ◽  
Jewish Family ◽  
Sh Groups ◽  
Red Cell Enzymes ◽  
Abnormal Hemoglobin ◽  
Relationship Of ◽  
The Relationship ◽  
Cell Defect

Abstract A Jewish family in which Hb L Ferrara (α247 Asp → Gly β2) occurred is reported. Studies of some of the properties of this hemoglobin demonstrated that its oxygen equilibria, number of readily reactive-SH groups, and spectro-photometric tyrosine titration were indistinguishable from Hb A. Nevertheless, Hb LF was more unstable than Hb A at 55 C. The propositus had accelerated blood destruction although six other heterozygotes for Hb LF did not. A second defect in red cell enzymes or red cell lipids of the propositus was not demonstrable with the technics used but the possibility that the simultaneous occurrence of Hb LF and an otherwise "silent" red cell defect may lead to a hemolytic state remains an attractive explanation. The data provided by this family study did not permit a definite conclusion about the relationship of clinically evident hemolysis in the propositus to the presence of the abnormal hemoglobin.

scholarly journals The Relationship of Bartonella Bacilliformis to the Red Blood Cell as Revealed by Electron Microscopy

Blood ◽  
1969 ◽  
Vol 33 (5) ◽  
pp. 708-716 ◽  
Author(s):  
MANUEL CUADRA ◽  
JUAN TAKANO
Keyword(s):  
Electron Microscopy ◽  
Blood Cell ◽  
Red Cells ◽  
Red Cell ◽  
Bartonella Bacilliformis ◽  
Coccoid Form ◽  
Blood Smears ◽  
Ultrathin Sections ◽  
Relationship Of ◽  
The Relationship

Abstract Ultrathin sections of erythrocytosis parasitized by B. bacilliformis have been examined by electron microscopy. The study concerns three Oroya Fever patients whose blood smears showed B. bacilliformis predominantly in its coccoid form as parastizing over 70 per cent of the red cells. B. bacilliformis is termed as a bacterium in its structure and appears to lie not only on the host red cells but predominantly within them. Therefore, this organism might have the capacity to penetrate into the red cell. This finding does not change the basic concept regarding the mechanism of the anemia of Oroya Fever.

scholarly journals Improved testing for vitamin B12 deficiency: correcting MMA for eGFR reduces the number of patients classified as vitamin B12 deficient

2018 ◽  
Vol 55 (6) ◽  
pp. 685-692 ◽  
Author(s):  
Saskia LM van Loon ◽  
Anna M Wilbik ◽  
Uzay Kaymak ◽  
Edwin R van den Heuvel ◽  
Volkher Scharnhorst ◽  
...  
Keyword(s):  
Data Mining ◽  
Vitamin B12 ◽  
Methylmalonic Acid ◽  
Vitamin B12 Deficiency ◽  
The Elderly ◽  
Vitamin B ◽  
Data Mining Approach ◽  
Number Of Patients ◽  
B12 Deficiency ◽  
The Relationship

Background Methylmalonic acid (MMA) can detect functional vitamin B12 deficiencies as it accumulates early when intracellular deficits arise. However, impaired clearance of MMA from blood due to decreased glomerular filtration rate (eGFR) also results in elevated plasma MMA concentrations. Alternative to clinical trials, a data mining approach was chosen to quantify and compensate for the effect of decreased eGFR on MMA concentration. Methods Comprehensive data on patient’s vitamin B12, eGFR and MMA concentrations were collected ( n = 2906). The relationship between vitamin B12, renal function (eGFR) and MMA was modelled using weighted multiple linear regression. The obtained model was used to estimate the influence of decreased eGFR on MMA. Clinical impact was examined by comparing the number of patients labelled vitamin B12 deficient with and without adjustment in MMA. Results Adjusting measured MMA concentrations for eGFR in the group of patients with low-normal vitamin B12 concentrations (90–300 pmol/L) showed that the use of unadjusted MMA concentrations overestimates vitamin B12 deficiency by 40%. Conclusions Through a data mining approach, the influence of eGFR on the relation between MMA and vitamin B12 can be quantified and used to correct the measured MMA concentration for decreased eGFR. Especially in the elderly, eGFR-based correction of MMA may prevent over-diagnosis of vitamin B12 deficiency and corresponding treatment.

Effect of Nembutal on circulating and tissue blood volumes and hematocrits of intact and splenectomized mice

1959 ◽  
Vol 197 (2) ◽  
pp. 399-402 ◽  
Author(s):  
Julius J. Friedman
Keyword(s):  
Blood Volume ◽  
Vascular Tone ◽  
Red Cell ◽  
Circulating Blood Volume ◽  
Relationship Of ◽  
The Relationship ◽  
Cell Volumes ◽  
Blood Volumes

The effect of Nembutal on the circulating and tissue blood volumes and hematocrits was calculated by means of independent determinations of plasma and red cell volumes. Nembutal produced an increase in circulating blood volume accompanied by a reduction in the venous hematocrit. The blood volumes of liver, kidney, spleen and intestine rose following the administration of Nembutal, while the hematocrits of liver, lung, intestine and muscle declined, and that of kidney rose. The administration of Nembutal to splenectomized mice produces similar changes. The relationship of these alterations to changes in periphero-vascular tone are discussed.

Abstract 17063: Sleep Related Breathing Disorders and Heart Rate Variability in Young and Healthy Adults From the General Population

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Stefanie Aeschbacher ◽  
Matthias Bossard ◽  
Mirco von Rotz ◽  
Tobias Schoen ◽  
Anna Maseli ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Sleep Apnea ◽  
Large Population ◽  
Healthy Adults ◽  
Apnea Hypopnea Index ◽  
Sleep Related Breathing Disorders ◽  
Breathing Disorders ◽  
Relationship Of ◽  
The Relationship

Background: The influence of sleep related breathing disorders on heart rate variability (HRV), a measure of autonomic nervous function, is not well studied. We therefore assessed the relationship of the Apnea-Hypopnea Index (AHI) and the Oxygen Desaturation Index (ODI) with 24-hour HRV in a large population of young and healthy adults. Methods: Individuals aged between 25-41 years with a body mass index ≤35km/kg2 and without known sleep apnea syndrome (SAS) or cardiovascular disease were included in the population-based GAPP-study. A 24-hour electrocardiogram (ECG) was obtained in every participant, and systematic post-processing performed with a dedicated software. The standard deviation of all normal RR intervals (SDNN) was used as main HRV marker. AHI and ODI were obtained from nighttime pulsoxymetry with nasal airflow measurements. Sleep apnea (SA) was defined as either an AHI ≥5 or an ODI ≥5. Multivariable regression models were constructed to assess the relationship of SDNN with either AHI or ODI and to adjust for a large number of confounders. Results: We included 1266 participants (47% men) with a median age of 35 years. Mean SDNN among men and women was 162 and 148ms (p<0.0001), respectively. The proportion of participants with SA using an AHI- or ODI-based definition was 10 and 11%, respectively. Compared to individuals without SA, the beta coefficient (95% confidence interval (CI)) for SDNN was -7.48 (-14.75; -0.23, p=0.04) among those with an AHI-based SA definition, and was -11.45 (-18.39; -4.52, p=0.001) among those with an ODI-based SA definition. A highly significant inverse trend across different categories of AHI and ODI was observed, as shown in the Table. Conclusion: Early stages of sleep related breathing disorders are strongly associated with decreasing HRV in young and healthy adults, without evidence of a threshold. These findings suggest a tight link between sleep related breathing disorders and autonomic dysfunction.

scholarly journals In Vitro Measurements of the Effects of Anticoagulants on the Flow Properties of Blood: The Relationship of these Effects to Red Cell Shrinkage

Blood ◽  
1968 ◽  
Vol 31 (2) ◽  
pp. 234-241 ◽  
Author(s):  
WILLIAM I. ROSENBLUM
Keyword(s):  
Cell Size ◽  
Blood Viscosity ◽  
Plasma Viscosity ◽  
Red Cell ◽  
Flow Properties ◽  
Cell Shrinkage ◽  
In Vitro Measurements ◽  
Relationship Of ◽  
The Relationship

Abstract Citrate and oxalate increased the viscosity of blood as measured in a capillary viscosimeter. The elevated viscosity was accompanied by erytrhocyte shrinkage, manifest by the decreased hematocrit of blood anticoagulated with either of these agents. Plasma viscosity was not affected. EDTA, which does not alter cell size or shape, also failed to alter blood viscosity, while citrate no longer affected viscosity, if utilized in ACD solution, a milieu which prevents cell shrinkage. When erythrocytes were suspended in hypertonic NaCl, "blood" viscosity was also elevated in comparison to that of suspensions in lower concentrations of NaCl. The data indicate that blood viscosity will be elevated by anticoagulants which are permitted to shrink erythrocytes.

scholarly journals The Relationship of Plasma Linoleic Acid and Oleic Acid Levels with Markers of Inflammation and Glycemia in Healthy Adults

2020 ◽  
Vol 4 (Supplement_2) ◽  
pp. 618-618
Author(s):  
Rachel Cole ◽  
Austin Angelotti ◽  
Martha Belury
Keyword(s):  
Body Composition ◽  
Oleic Acid ◽  
Fatty Acid ◽  
Linoleic Acid ◽  
Grip Strength ◽  
Healthy Adults ◽  
Dietary Oils ◽  
Hmw Adiponectin ◽  
Relationship Of ◽  
The Relationship

Abstract Objectives Higher blood levels of the essential fatty acid, linoleic acid (LA), are associated with a decreased risk of type 2 diabetes.  However, many dietary oils once high in LA are now low in LA and high in oleic acid (OA).  We have previously shown in healthy adults that supplementation with a high LA oil can increase plasma LA levels and decrease plasma OA levels.  The current study examines the relationship of habitual levels of plasma LA and OA with markers of body composition, inflammation and glycemia in healthy adults. Methods Data from baseline visit were analyzed from 127 health adults participating in a 2-week study of the effect of dietary oils on blood fatty acid profiles.  Plasma fatty acid composition was measured by gas chromatography. Insulin, glucose, total and high molecular weight (HMW) adiponectin, tumor necrosis factor receptor 2 (TNF-r2) and lipopolysaccharide binding protein (LBP) were measured in fasting plasma samples.  Body mass index (BMI) and sagittal diameter (SAD) were measured as markers of body composition.  Grip strength was measured as a marker of muscle strength and gait speed was measured as a marker of muscle function.  Linear regression was used to assess the association of study measurements to plasma LA or OA.  Results were adjusted for sex, age, physical activity and BMI. Results Plasma LA was negatively associated with both BMI and SAD while plasma OA was positively associated with both insulin and grip strength.  In males, but not females, higher plasma LA was associated with higher HMW adiponectin while higher plasma OA was positively associated with fasting glucose.  Neither plasma LA or OA were associated with total adiponectin, TNF-r2, LBP or gait speed. Conclusions Higher levels of plasma LA predicted for lower measures of adiposity in both males and females and higher HMW adiponectin levels in males. Higher levels of plasm OA predicted for increased grip strength and higher glycemia, particularly in men.  To our knowledge no randomized controlled trial has compared LA or OA supplementation on body composition, glycemia, and adiponectin in healthy men and women. Funding Sources Funding was provided by the Carol S. Kennedy Professorship and the Ohio Agriculture Research and Development Center.

THE RELATIONSHIP OF ERYTHROCYTE INSULIN RECEPTORS TO RED CELL AGE AND TO MONOCYTE INSULIN RECEPTORS

1981 ◽  
Vol 14 (3) ◽  
pp. 269-278 ◽  
Author(s):  
G. M. WARD ◽  
A. R. REES ◽  
B. A. NAYLOR ◽  
R. C. TURNER
Keyword(s):  
Insulin Receptors ◽  
Red Cell ◽  
Cell Age ◽  
Relationship Of ◽  
The Relationship
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