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  • 1
    ISSN: 1432-1041
    Keywords: valproate ; blood distribution ; red blood cell uptake ; plasma protein binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Sodium valproate at a concentration of 300 µmol/l in whole blood, partitioned between the red blood cell and plasma to produce a red blood cell/plasma partition ratio of 0.20. Red blood cell uptake was proportional to percent free drug in plasma and uptake was maximal when plasma was replaced by buffer, producing a red blood cell/buffer ratio of 0.87. Reduction of plasma protein binding by plasma dilution, by increasing the total sodium valproate plasma concentration, or by renal or hepatic disease in 24 patients, caused a predictable rise in red blood cell uptake of drug. The red blood cell represented a relatively small compartment for free sodium valproate in blood, however uptake of the drug into this compartment increased considerably in states of reduced plasma protein binding. Because the concentration of drug in the red blood cell reflects free drug concentration in plasma, the red blood cell may serve as an indicator of free drug changes in blood.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1041
    Keywords: amiodarone ; antiarrhythmic drug ; QT interval ; blood level monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We have studied 27 patients on long-term treatment (6–60 months) with amiodarone (dose range 350 mg per week to 2800 mg per week) to ascertain whether the corrected QT interval could predict plasma amiodarone or plasma desethylamiodarone concentration. The patients were assessed on three or four occasions one month apart. There were positive correlations for Δ% QTc and plasma amiodarone and Δ% QTc and plasma desethylamiodarone. There was approximately a four-fold variation for Δ% QTc and plasma amiodarone. This variation was not accounted for by between-occasion variation in the QTc interval, as the coefficient of variation was 2.1%. In six of the patients Δ% QTc either decreased or did not change. Δ% QTc is not a reliable predictor of plasma amiodarone concentration in the individual patient over time.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1041
    Keywords: propranolol ; atenolol ; plasma noradrenaline ; sympathetic activity ; blood pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The acute effects upon blood pressure and sympathetic outflow of two beta adrenoceptor blocking drugs, propranolol and atenolol, are described in five healthy normotensive subjects. Supine blood pressure, heart rate, plasma noradrenaline, and urinary catecholamine excretion were measured before and at intervals for 24 h after a single oral dose of either propranolol 200 mg, atenolol 100 mg, or placebo. Propranolol caused a fall in blood pressure and heart rate of 17.2/14.1 mm Hg and 20.4 beats/min respectively two hours after dose. Atenolol caused a fall in blood pressure of 11.4/18.6 mm Hg withih 7 h of the dose, and a fall in heart rate of 13.8 beats/min after 2 h. The reduction in blood pressure after single high dose beta adrenoceptor blockade is established. The synchronous reduction in blood pressure and heart rate after propranolol was not associated with an increase in peripheral sympathetic activity as assessed by the biochemical indices. It is conceivable that the reduction in blood pressure during beta adrenoceptor blockade may be due in part to inappropriately low sympathetic activity but this cannot be the main mechanism of pressure reduction.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 21 (1994), S. 0 
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Haematologic parameters were measured in untreated borderline hypertensive (BHT) men, and weight and age matched with normotensive men to determine whether previously described increased haematocrit (Hct) in established hypertension is evident in borderline hypertension.2. Haematocrit was significantly increased in BHT men (mean 0.46, s.d. 0.032) compared with normotensive men (mean 0.43, s.d. 0.014) and correlated significantly with mean arterial pressure in this group (r = 0.67, P= 0.036) independent of weight.3. The correlation of blood pressure with Hct in BHT men supports the concept that increased Hct may contribute to increased blood viscosity and thus to raised arterial pressure.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 20 (1993), S. 0 
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Erythrocytic sodium-lithium (Na-Li) countertransport (CT) was measured in normotensive Maori and non-Maori by in vitro and in vivo methods to determine its relationship to erythrocytic hypernatraemia previously identified in Maori.2. In vivo and in vitro CT rates were correlated within race and were similar between races. Countertransport rate was correlated with erythrocytic sodium concentration only in Maori.3. The findings suggest the possibility of a genetically determined alteration in CT stoichiometry in Maori.
    Type of Medium: Electronic Resource
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