Influence of metoprolol treatment on sympatho-adrenal activation of fibrinolysis.

Abstract:

:The effects of mental stress (a colour word conflict test, CWT) and adrenaline infusions (0.1 and 0.4 nmol kg-1 min-1) on t-PA activity, t-PA antigen, PAI-1 activity and PAI-1 antigen were studied in 18 healthy male volunteers. Furthermore, the effects of metoprolol (200 mg/day during 1 week) or placebo (double-blind cross-over study) on fibrinolytic responses to sympatho-adrenal activation, and relationships between fibrinolysis and blood lipids were investigated. Low and high dose adrenaline infusions yielding plasma adrenaline levels of 0.9 +/- 0.1 and 3.4 +/- 0.4 nmol/l, respectively, dose-dependently increased t-PA levels with a concomitant decrease in PAI-1 levels. A similar, but weaker, fibrinolytic response seemed to occur during CWT, when plasma adrenaline levels were only moderately increased (to 0.4 +/- 0.1 nmol/l). Metoprolol treatment did not influence the resting levels of the fibrinolytic variables studied, but tended to enhance the t-PA response to CWT and further reduce PAI-1 during adrenaline infusion. Metoprolol treatment was not accompanied by any rise in PAI-1 levels despite drug induced elevations of triglyceride levels. Thus, the present study shows that sympatho-adrenal activation increases fibrinolytic activity in vivo and that metoprolol treatment may have a favourable influence on this activity.

journal_name

Thromb Haemost

authors

Larsson PT,Wiman B,Olsson G,Angelin B,Hjemdahl P

subject

Has Abstract

pub_date

1990-06-28 00:00:00

pages

482-7

issue

3

eissn

0340-6245

issn

2567-689X

journal_volume

63

pub_type

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