Hemodynamic changes determine the efficacy of thrombolysis: results from an in-vitro flow model.

Abstract:

BACKGROUND:The efficacy of thrombolytic therapy might be influenced by changes in the hemodynamic status. The aim of the study was to examine whether changes in perfusion pressure could affect the time to reflow in an in-vitro model. METHODS:The in-vitro flow system comprised flexible plastic tubes that enclosed a blood clot formed in one of the circuit arms. Streptokinase (125,000 U) or saline (control) was injected from a proximal side branch to induce thrombolysis. The protocol comprised four treatments: A, perfusion pressure 150/90 mmHg with streptokinase infusion; B, perfusion pressure 150/90 mmHg with saline; C, perfusion pressure 120/60 mmHg with streptokinase; D, perfusion pressure 120/60 mmHg with saline. Reflow was defined as flow restoration determined by the ultrasonic flowmeter. RESULTS:Successful recanalization was obtained in six of six samples subjected to treatment A (100%), two of seven samples subjected to treatment B (28%), three of five samples subjected to treatment C (60%) and none of six samples subjected to treatment D (0%). Time to reflow was 23 +/- 11 min with treatment A, 76 +/- 24 min with treatment B, 66 +/- 25 min with treatment C, and > 90 min with treatment D. CONCLUSIONS:Our data suggest that the hemodynamic status determines the efficacy of streptokinase-induced thrombolysis, and that spontaneous clot lysis is more likely to occur at greater perfusion pressures. It is conceivable that the hypotensive reaction induced by streptokinase in the clinical setting may adversely affect angiographic patency, compared with that observed with other lytic agents such as tissue-type plasminogen activator.

journal_name

Coron Artery Dis

journal_title

Coronary artery disease

authors

Kornowski R,Mendelevich L,Zaretsky U,Einav S,Laniado S,Keren G

doi

10.1097/00019501-199809010-00007

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

43-8

issue

1

eissn

0954-6928

issn

1473-5830

journal_volume

9

pub_type

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