Studies On Fibrinolytic Activity in Normal Persons and Patients With Atherosclerotic Vascular Dis Ease After Physical Activity and Injections of Nicotinic Acid

In 14 patients with coronary heart disease the effect of long-term treatment (mean 16 months, range 12-33) with alprenolol on platelet function and fibrinolytic activity was studied. While on the beta-blocker and two weeks after gradual withdrawal of it, the patients performed a bicycle-ergometer test and blood samples were obtained before and following exercise. Pre-exercise fibrinolytic activity, assessed by the euglobulin clot lysis time, was 183 +/- 27 min (mean +/- SEM) while on alprenolol as compared to 111 +/- 18 min (p less than 0.01) after its withdrawal. Activation of fibrinolysis following exercise was not significantly influenced by alprenolol. In patients treated with alprenolol, the pre-exercise threshold level of ADP, producing platelet aggregation was 3.3 muM (geometric mean) and 5.1 muM after stopping treatment (p less than or equal to 0.05). In patients receiving the beta-blocker, the ADP- threshold value dropped from 3.3 muM before exercise to 2.3 muM immediately after exercise (not significant). The corresponding values after withdrawal of alprenolol were 5.1 muM and 2.7 muM (p less than or equal to 0.02). Adrenaline - stimulated aggregation was not significantly influenced by alprenolol. Serotonin release from platelets following maximal ADP- and adrenaline stimuli was not significantly changed by exercise in patients on beta-blockade. After stopping treatment, ADP-induced serotonin release was 22 +/- 4.1% before and 15 +/- 4.7% after exercise (p less than 0.02). the corresponding values using the adrenaline stimulus were 29 +/- 5.7% and 17 +/- 4.7% (p less than 0.05). It is suggested that during physical stress alprenolol may protect platelets against aggregatory stimuli.

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Effect of long-term beta-blockade with alprenolol on platelet function and fibrinolytic activity in patients with coronary heart disease

Jürgensen

Dalsgaard-Nielsen

Kjøller

et al. 1981

Eur J Clin Pharmacol

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Changes in plasmatic tissue-type plasminogen activator and plasminogen activator inhibitor activity during acute arterial occlusion associated with severe ischemia

Schneiderman

Adar

Savion

1991

Thrombosis Research

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Studies On Fibrinolytic Activity in Normal Persons and Patients With Atherosclerotic Vascular Dis Ease After Physical Activity and Injections of Nicotinic Acid

Cited by 2 publications

References 21 publications

Effect of long-term beta-blockade with alprenolol on platelet function and fibrinolytic activity in patients with coronary heart disease

Effect of long-term beta-blockade with alprenolol on platelet function and fibrinolytic activity in patients with coronary heart disease

Changes in plasmatic tissue-type plasminogen activator and plasminogen activator inhibitor activity during acute arterial occlusion associated with severe ischemia

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