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  • 1
    ISSN: 1432-1041
    Keywords: ritanserin ; hypertension ; serotonin ; (5 HT) ; blood pressure ; platelet aggregation ; QT interval
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We have given the selective 5 HT2 antagonist ritanserin in a dose of 10 mg twice daily for 4 weeks in a double-blind, randomized, placebocontrolled, parallel group study of 18 patients with untreated essential hypertension. The fall in single platelet count due to 5 HT-induced platelet aggregation was significantly reduced by ritanserin compared with placebo (p〈0.05). There were no significant changes in supine or erect blood pressure or heart rate after ritanserin compared to placebo. Forearm blood flow, measured by mercury-in-strain gauge venous occlusion plethysmography, was not significantly altered by ritanserin. Ritanserin caused prolongation of the QTc interval by 41 (SEM 11) ms (p〈0.05 compared to placebo) but had no detectable effect on QRS duration, features suggestive of Class III antiarrhythmic activity. These findings do not support an independent role of the 5 HT2 receptor in maintaining raised arterial pressure in essential hypertension.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Retinopathy ; insulin treated diabetes ; blood viscosity ; plasma viscosity ; haematocrit ; fibrinogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Blood viscosity (shear rates 100s-1 and 0.94 s-1) and several of its major determinants (haematocrit, plasma fibrinogen and plasma viscosity) have been measured in 38 male insulin-treated diabetics, aged 18–50 years, and in 38 non-diabetic control subjects matched for age and smoking habit. Diabetics without fundoscopic retinopathy (n=20) had higher mean blood viscosity than controls at the high shear rate (7.07 cP vs 6.75 cP, p〈0.05) and the low shear rate (21.2 cP vs 18.7 cP, p〈0.025). These differences persisted after correction of blood viscosity to a standard haematocrit, and were associated with increased plasma viscosity (1.41 cP vs 1.34 cP, p〈0.025) and plasma fibrinogen (2.9 g/L vs. 2.5 g/L, p〈0.025). Diabetics with retinopathy (n=18) had higher mean blood viscosity than diabetics without retinopathy at the high shear rate (7.53 cP vs 7.07 cP, p〈0.05) and the low shear rate (24.3 cP vs. 21.2 cP, p〈0.05), associated with a higher haematocrit (p〈0.05). Blood viscosity and haematocrit correlated with the duration of diabetes (r〉0.32, p〈0.05).
    Type of Medium: Electronic Resource
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