Abstract The present study was designed to investigate whether medium-term, low-dose heparin treatment is able to affect the fibrinolytic system. In a randomized cross-over study 10 asymptomatic patients with previous (1-6 years) myocardial infarction underwent two sequential 15-day treatments, respectively, on heparin and on placebo (saline solution), preceded and separated by 10-day wash-out periods. Heparin (as calcium heparin, 12,500 IU in 0.5 ml) and saline (0.5 ml) were subcutaneously administered once a day at 8 a.m. Blood samples for fibrinolysis studies were withdrawn on the first and 15th day of each period immediately before and 4 h after heparin or saline administration before and after 10 min venous occlusion (VO) respectively. Four hours after the first heparin administration tissue plasminogen activator antigen (t-PA ag) levels significantly increased with respect to saline administration (p < 0.01 and p < 0.05, respectively). After 15-day heparin treatment a decrease in euglobulin lysis time (p < 0.05) and an increase in t-PA activity (act) (p < 0.05) and in t-PA ag (p < 0.01) in comparison with placebo were observed before VO. No statistically significant changes in plasminogen activator inhibitor-1 (PAI-1) levels were found. The variations of fibrinolytic system activity induced by heparin treatment were more marked when evaluated after VO. These results indicate that medium-term low-dose heparin treatment increases t-PA ag formation and/or release with consequent t-PA act increase.

Effect of low-dose heparin treatment on fibrinolysis in patients with previous myocardial infarction / D. Prisco; R. Paniccia; G.F. Gensini; M. Coppo; A. Colella; M. Filippini; T. Brunelli; R. Abbate; G.G. Neri Serneri.. - In: HAEMOSTASIS. - ISSN 0301-0147. - STAMPA. - (1993), pp. 308-313.

Effect of low-dose heparin treatment on fibrinolysis in patients with previous myocardial infarction

PRISCO, DOMENICO;PANICCIA, RITA;GENSINI, GIAN FRANCO;COPPO, MIRELLA;ABBATE, ROSANNA;NERI SERNERI, GIAN GASTONE
1993

Abstract

Abstract The present study was designed to investigate whether medium-term, low-dose heparin treatment is able to affect the fibrinolytic system. In a randomized cross-over study 10 asymptomatic patients with previous (1-6 years) myocardial infarction underwent two sequential 15-day treatments, respectively, on heparin and on placebo (saline solution), preceded and separated by 10-day wash-out periods. Heparin (as calcium heparin, 12,500 IU in 0.5 ml) and saline (0.5 ml) were subcutaneously administered once a day at 8 a.m. Blood samples for fibrinolysis studies were withdrawn on the first and 15th day of each period immediately before and 4 h after heparin or saline administration before and after 10 min venous occlusion (VO) respectively. Four hours after the first heparin administration tissue plasminogen activator antigen (t-PA ag) levels significantly increased with respect to saline administration (p < 0.01 and p < 0.05, respectively). After 15-day heparin treatment a decrease in euglobulin lysis time (p < 0.05) and an increase in t-PA activity (act) (p < 0.05) and in t-PA ag (p < 0.01) in comparison with placebo were observed before VO. No statistically significant changes in plasminogen activator inhibitor-1 (PAI-1) levels were found. The variations of fibrinolytic system activity induced by heparin treatment were more marked when evaluated after VO. These results indicate that medium-term low-dose heparin treatment increases t-PA ag formation and/or release with consequent t-PA act increase.
1993
308
313
D. Prisco; R. Paniccia; G.F. Gensini; M. Coppo; A. Colella; M. Filippini; T. Brunelli; R. Abbate; G.G. Neri Serneri.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/756525
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