Plasma and platelet free catecholamine concentrations in patients with familial hypercholesterolaemia

1992 ◽  
Vol 82 (1) ◽  
pp. 113-116 ◽  
Author(s):  
C. C. T. Smith ◽  
B. N. C. Prichard ◽  
D. J. Betteridge
Keyword(s):  
Familial Hypercholesterolaemia ◽  
Plasma Cholesterol ◽  
Normal Subjects ◽  
Plasma Noradrenaline ◽  
Cholesterol Concentration ◽  
Plasma Cholesterol Concentration ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration ◽  
Heterozygous Familial Hypercholesterolaemia ◽  
Noradrenaline Levels

1. Plasma and platelet free catecholamine concentrations were measured in 22 normal subjects and in 10 treated and 11 untreated patients with heterozygous familial hypercholesterolaemia. 2. Plasma noradrenaline concentrations were significantly higher in both treated and untreated hypercholesterolaemic patients than in normal subjects. Adrenaline concentrations did not differ. 3. Platelet noradrenaline levels were higher in untreated hypercholesterolaemic patients than in normal subjects. 4. Positive correlations between the plasma noradrenaline concentration and the platelet noradrenaline concentration were observed in both normal subjects and hypercholesterolaemic patients. 5. Combining the data for normal subjects and hypercholesterolaemic patients revealed that the plasma noradrenaline concentration correlated positively with the plasma cholesterol concentration. The platelet noradrenaline concentration was also found to correlate with the plasma cholesterol concentration. 6. Our results suggest that an increased plasma cholesterol concentration may be associated with increased sympathetic nervous system activity as indicated by elevated plasma and platelet noradrenaline levels. Increases in circulating catecholamines may contribute to the platelet hyperaggregability seen in familial hypercholesterolaemia.

Plasma Noradrenaline as a Measure of Baroreflex Sensitivity in Hypertensive Man

1981 ◽  
Vol 61 (s7) ◽  
pp. 165s-168s ◽  
Author(s):  
A. M. M. Shepherd ◽  
M.-S. Lin ◽  
T. K. Keeton ◽  
J. L. McNay
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Baroreflex Sensitivity ◽  
Clinical Investigation ◽  
Plasma Noradrenaline ◽  
Chronotropic Response ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration ◽  
Lower Blood ◽  
Noradrenaline Levels

1. Changes in plasma noradrenaline levels and heart rate were used as measures of baroreflex sensitivity in six hypertensive subjects given serial incremental doses of sodium nitroprusside (intravenously) to lower blood pressure. 2. The rises in both heart rate and plasma noradrenaline concentration were linearly related to the decrement in blood pressure and inversely related to the severity of the hypertension. 3. A positive correlation between rise in heart rate and rise in plasma noradrenaline was found for each subject. With increasing severity of hypertension, a greater increase in heart rate occurred for each increment in plasma noradrenaline concentration. 4. Baroreflex sensitivity can be assessed by relating changes in heart rate to change in arterial pressure; however, this method does not distinguish the relative contributions of the vagal and sympathetic components of the autonomic neural response or variations in the chronotropic response to sympathetic stimulation. 5. Changes in plasma noradrenaline levels in response to graded reductions in blood pressure may be a more appropriate measure of baroreflex sensitivity than the methods currently used in clinical investigation.

Determination of Noradrenaline Uptake, Spillover to Plasma and Plasma Concentration in Patients with Essential Hypertension

1980 ◽  
Vol 59 (s6) ◽  
pp. 311s-313s ◽  
Author(s):  
M. Esler ◽  
G. Jackman ◽  
P. Leonard ◽  
A. Bobik ◽  
Helen Skews ◽  
...  
Keyword(s):  
Essential Hypertension ◽  
Normal Subjects ◽  
Plasma Noradrenaline ◽  
Neuronal Uptake ◽  
Noradrenaline Uptake ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration ◽  
Uptake Of Noradrenaline ◽  
Rapid Removal ◽  
Autonomic Insufficiency

1. The rates of entry of noradrenaline to plasma and of removal of noradrenaline from plasma, and plasma noradrenaline concentration, were determined in normal subjects and in patients with essential hypertension. Neuronal uptake of noradrenaline was assessed from the plasma tritiated noradrenaline disappearance curve, after infusion to steady state. 2. Noradrenaline disappearance was biexponential. Rapid removal was dependent on neuronal uptake, being slowed if neuronal noradrenaline uptake was reduced, either by desipramine in normal subjects, or in patients with sympathetic nerve dysfunction (autonomic insufficiency). 3. In 10 of 41 hypertensive patients the t1 1/2 similarly was prolonged, presumptive evidence of a defect in neuronal noradrenaline uptake. Endogenous noradrenaline escaping uptake after release, and spilling over into plasma, and plasma noradrenaline concentration, were increased in these patients. 4. Defective neuronal uptake of noradrenaline, by exposing adrenoreceptors to high local transmitter concentration, may be important in the pathogenesis of essential hypertension in some patients.

Age-Dependence of Noradrenaline Kinetics in Normal Subjects

1981 ◽  
Vol 60 (2) ◽  
pp. 217-219 ◽  
Author(s):  
M. Esler ◽  
H. Skews ◽  
P. Leonard ◽  
G. Jackman ◽  
A. Bobik ◽  
...  
Keyword(s):  
Nervous System ◽  
Healthy Subjects ◽  
Plasma Clearance ◽  
Normal Subjects ◽  
Plasma Noradrenaline ◽  
Age Dependence ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration ◽  
Sympathetic Nervous ◽  
Older Subjects

1. The influence of age on the rate of spillover of noradrenaline into plasma, clearance of noradrenaline from plasma, and plasma noradrenaline concentration at rest was studied in 34 healthy subjects aged 20–69 years. 2. The plasma concentration of noradrenaline was dependent on age, values being higher in older subjects. 3. This age-dependence of plasma noradrenaline concentration was due principally to a reduced clearance of noradrenaline from the circulation in older subjects. 4. The rate of spillover of noradrenaline into plasma was little influenced by age. The higher plasma noradrenaline values found in older subjects do not seem to be due to an increase in sympathetic nervous system tone with aging.

Effects of desmethylimipramine and normetanephrine on calorigenic response and plasma noradrenaline concentration in warm- and in cold-acclimated rats exposed to cold

1983 ◽  
Vol 61 (10) ◽  
pp. 1177-1184 ◽  
Author(s):  
Chi-Chung Chan ◽  
Florent Depocas
Keyword(s):  
Oxygen Consumption ◽  
Cold Exposure ◽  
Plasma Noradrenaline ◽  
Extraneuronal Uptake ◽  
Physiological Conditions ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration ◽  
Time Required ◽  
Noradrenaline Levels

Oxygen consumption and plasma noradrenaline concentration were increased significantly above resting levels in warm-acclimated and in cold-acclimated rats exposed to an ambient temperature of 4 °C. Administration of normetanephrine (1 μg∙min−1∙g body weight−0.74), but not of desmethylimipramine (1 mg∙kg−1), resulted in higher resting plasma noradrenaline levels at 24 °C and increased the length of time required for the oxygen consumption to return to resting levels after cold exposure in both acclimation groups. These observations support a significant role of extraneuronal uptake in noradrenaline inactivation under normal physiological conditions. Calorigenic responses to cold exposure were not affected at all by treatment of animals with desmethylimipramine and (or) normetanephrine in either warm-acclimated or cold-acclimated rats, although an enhancing effect of these uptake inhibitors on plasma noradrenaline was evident in cold-acclimated rats. It is suggested that a peripheral–central thermoregulatory mechanism adjusts activation of thermogenic effectors so as to maintain a steady calorigenic response, appropriate to the thermal demand of the environment, to compensate for changes in perineuronal concentration of noradrenaline in sympathetic thermoeffectors owing to blockade of extraneuronal uptake.

Performance of commercially-available cholesterol self-tests

2021 ◽  
pp. 000456322199239
Author(s):  
Steef Kurstjens ◽  
Eugenie Gemen ◽  
Selina Walk ◽  
Tjin Njo ◽  
Johannes Krabbe ◽  
...  
Keyword(s):  
High Density Lipoprotein ◽  
Diagnostic Performance ◽  
Plasma Cholesterol ◽  
Density Lipoprotein ◽  
High Density ◽  
Cholesterol Concentration ◽  
Limited Information ◽  
Plasma Cholesterol Concentration ◽  
Lipid Panel ◽  
Better Regulation

Background Hypercholesterolemia (plasma cholesterol concentration ≥5.2 mmol/L) is a risk factor for cardiovascular disease and stroke. Many different cholesterol self-tests are readily available at general stores, pharmacies and web shops. However, there is limited information on their analytical and diagnostic performance. Methods We included 62 adult patients who required a lipid panel measurement (cholesterol, high-density lipoprotein (HDL), triglycerides and LDLcalc) for routine care. The performance of five different cholesterol self-tests, three quantitative meters ( Roche Accutrend Plus, Mission 3-in-1 and Qucare) and two semi-quantitative strip tests ( Veroval and Mylan MyTest), was assessed according to the manufacturers’ protocol. Results The average plasma cholesterol concentration was 5.2 ± 1.2 mmol/L. The mean absolute relative difference (MARD) of the five cholesterol self-tests ranged from 6 ± 5% ( Accutrend Plus) to 20 ± 12% ( Mylan Mytest). The Accutrend Plus cholesterol meter showed the best diagnostic performance with a 92% sensitivity and 89% specificity. The Qucare and Mission 3-in-1 are able to measure HDL concentrations and can thus provide a cholesterol:HDL ratio. The Passing-Bablok regression analyses for the ratio showed poor performance in both self-tests ( Mission 3-in-1: y = 1.62x–1.20; Qucare: y = 0.61x + 1.75). The Accutrend Plus is unable to measure the plasma high-density lipoprotein concentration. Conclusions/interpretation: The Accutrend Plus cholesterol meter (Roche) had excellent diagnostic and analytic performance. However, several of the commercially-available self-tests had considerably poor accuracy and diagnostic performance and therefore do not meet the required qualifications, potentially leading to erroneous results. Better regulation, standardization and harmonization of cholesterol self-tests is warranted.

scholarly journals Effect of dietary cholesterol on plasma cholesterol concentration in subjects following reduced fat, high fibre diet.

BMJ ◽  
1987 ◽  
Vol 294 (6568) ◽  
pp. 333-336 ◽  
Author(s):  
J Edington ◽  
M Geekie ◽  
R Carter ◽  
L Benfield ◽  
K Fisher ◽  
...  
Keyword(s):  
Plasma Cholesterol ◽  
Dietary Cholesterol ◽  
Cholesterol Concentration ◽  
Plasma Cholesterol Concentration ◽  
High Fibre Diet ◽  
Reduced Fat ◽  
Fibre Diet ◽  
High Fibre

scholarly journals Increase in plasma noradrenaline concentration after the administration of phentolamine in the patients with "latent" left-sided heart failure.

1989 ◽  
Vol 53 (12) ◽  
pp. 1497-1505 ◽  
Author(s):  
HIROKO WATANABE ◽  
HIROYASU ITO ◽  
SHINYA MINATOGUCHI ◽  
YOKO IMAI ◽  
MASATOSHI KOSHIJI ◽  
...  
Keyword(s):  
Heart Failure ◽  
Plasma Noradrenaline ◽  
Plasma Noradrenaline Concentration ◽  
Noradrenaline Concentration
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